JP2005300012A - Air conditioning freezer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning freezer capable of raising an energy efficiency ratio. <P>SOLUTION: An air conditioning system part is provided with a compressor for air conditioning, a heat source side heat exchanger, and a using side heat exchanger 27, and it carries out air conditioning of a room to be air conditioned by an indoor unit 11 housing the using side heat exchanger 27. A cooling system part is provided with a compressor for cooling, a condenser, and an evaporator, and it carries out cooling of a cooling storage facility 3 installed in the room to be air conditioned. A thermally connected cascade heat exchanger is supplied with a refrigerant for air conditioning of a low pressure side of the air conditioning system part, and a refrigerant for cooling of a high pressure side of the cooling system part. The indoor unit 11 is provided with a unit body part 72 housed in a ceiling interior 71 of the room to be air conditioned, and a decorative panel 76 arranged on a bottom face of the unit body 72. In the decorative panel 76, blowout openings 78A and 78D are formed in parallel with edges 76A and 76D other than edges of the decorative panel 76 facing the cooling storage facility 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioning refrigeration apparatus for performing indoor air conditioning and internal cooling of a cooling storage facility in, for example, a store.

In recent years, the air conditioning system that performs indoor air conditioning in stores such as convenience stores, and the cooling of refrigerated or refrigerated open showcases and display cases with doors (cooling storage equipment) that are placed in stores and sell products. An air-conditioning refrigeration apparatus including a cooling system unit to be performed has been proposed (for example, Patent Document 1).
JP 2002-174470 A

  In this type of air-conditioning refrigeration system, the air-conditioning system unit and the cooling system unit are only operated in accordance with the air-conditioning load and the cooling equipment load, respectively, and improve the energy consumption efficiency (COP, etc.) of the entire system. I can't.

  This invention is made | formed in view of the situation mentioned above, and it aims at providing the air-conditioning freezing apparatus which can raise energy consumption efficiency.

  In order to solve the above-described problems, the present invention provides an air conditioning of an air-conditioned room by an indoor unit that includes an air conditioning compressor, a heat source side heat exchanger, and a usage side heat exchanger and accommodates the usage side heat exchanger. An air conditioning system unit to perform, a cooling system unit that includes a cooling compressor, a condenser, and an evaporator, and cools the cooling storage facility disposed in the air-conditioned room by the evaporator, and the low pressure side of the air conditioning system unit A cascade heat exchanger that is supplied with and thermally coupled with a cooling refrigerant on the high-pressure side of the cooling system section, and the indoor unit is housed inside the ceiling of the air-conditioned room. A unit main body and a decorative panel disposed on a lower surface of the unit main body, and the decorative panel is formed with a blowout port along a side other than the side of the decorative panel facing the cooling storage facility. Features.

  In this case, the air outlet may be formed along two adjacent sides of the decorative panel.

  Moreover, the said blower outlet is good also as a structure formed with the circular arc-shaped opening whose center angle is about 90 degrees.

  The cooling storage facility may be an open showcase having an opening formed on the front surface.

  In the present invention, since the temperature-controlled air blown out from the indoor unit does not become a disturbance of the cooling storage facility, the load of the cooling system unit is stabilized, and the energy consumption efficiency of the cooling system unit can be improved.

  Furthermore, in the cascade heat exchanger, the energy consumption efficiency of the entire system can be improved by promoting heat exchange between the low-pressure side refrigerant of the air conditioning system unit and the high-pressure side refrigerant of the refrigeration system unit. it can.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a system configuration of an air conditioning refrigeration apparatus 1 according to the present embodiment. This air-conditioning refrigeration apparatus 1 realizes, for example, indoor air-conditioning in a convenience store store 2 (air-conditioned room), and cooling of a refrigerated case 3 or a freezing case 4 as a cooling storage facility installed therein. Is. The refrigerated case 3 includes an open showcase whose front and upper surfaces are open and a walk-in showcase whose opening is opened and closed freely with a transparent glass door. The inside of the refrigerator is refrigerated temperature (+ 3 ° C.). ~ + 10 ° C), and beverages and refrigerated foods are displayed. The freezer case 4 has a refrigerator that is cooled to a freezing temperature (−10 ° C. to −20 ° C.) to display frozen foods, frozen desserts, and the like.

  The air conditioning refrigeration apparatus 1 includes an air conditioning system unit 6 that performs air conditioning in the store 2 and a cooling system unit 8 that cools the refrigerated case 3 and the refrigeration case 4 in the cabinet. The air conditioning system unit 6 includes an indoor unit 11 installed on the ceiling of the store 2 and an outdoor unit 12 installed outside the store. An air conditioning refrigerant circuit 7 is provided between the indoor unit 11 and the outdoor unit 12. The air conditioning refrigerant circuit 7 includes a use side heat exchanger 27 housed in the indoor unit 11, a heat source side heat exchanger 16 installed in the outdoor unit 12, and air conditioning compressors 13A and 13B as compression units. The air-conditioning cycle is performed.

  The air conditioning compressor 13A is a compressor for inverter control, and the air conditioning compressor 13B is a compressor for constant speed operation. These air conditioning compressors 13A and 13B are connected in parallel, and the discharge sides of the air conditioning compressors 13A and 13B are joined via check valves 5A and 5B, and one inlet of the four-way valve 14 is passed through the oil separator 10. Connected to. One outlet of the four-way valve 14 is connected to the inlet of the heat source side heat exchanger 16. The heat source side heat exchanger 16 includes an inlet side 16A having a relatively small flow resistance composed of a large number of parallel pipes and an outlet side 16B in which these are aggregated into a small number of parallel pipes or a single pipe. The outlet on the outlet side 16B of the heat source side heat exchanger 16 is connected to the inlet of the expansion valve 18 via the check valve 5C and the expansion valve 17 connected in parallel. The outlet of the expansion valve 18 is an indoor unit. 11 is connected to the entrance of the use side heat exchanger 27.

  The outlet of the use side heat exchanger 27 is connected to the other inlet of the four-way valve 14 across the outdoor unit 12. The other outlet of the four-way valve 14 is connected to the inlet of the accumulator 23 via a check valve 5D, and the outlet of the accumulator 23 is connected to the suction side of the air conditioning compressors 13A and 13B. The check valve 5D has a forward direction on the accumulator 23 side.

  In the air conditioning refrigerant circuit 7, the refrigerant pipe between the expansion valve 17 and the expansion valve 18 is branched, and this branch pipe is connected to the cascade heat exchanger 21 via the expansion valve 19. The cascade heat exchanger 21 is formed by stacking a plurality of heat transfer plates to alternately form air conditioning side passages 21A and case side passages 21B through which two kinds of refrigerants flow in each heat transfer plate tube, and adjacent air conditioning units. A plate heat exchanger is used in which heat exchange is performed via a heat transfer plate while two types of refrigerant flow through the side passage 21A and the case side passage 21B. The cascade heat exchanger 21 thermally connects the low pressure side of the air conditioning refrigerant circuit 7 and the high pressure side of the cooling refrigerant circuit 9.

  In the cascade heat exchanger 21, the inlet of the air conditioning side passage 21A is connected to the expansion valve 19, and the outlet thereof is connected to the suction side of the air conditioning compressors 13A and 13B via the accumulator 23. As a result, the refrigerant whose pressure has been reduced by the expansion valve 19 is supplied to the cascade heat exchanger 21 and then returned to the air conditioning compressors 13A and 13B. That is, in the air conditioning refrigeration apparatus 1, a path α that passes through the use-side heat exchanger 27 and a path β that passes through the cascade heat exchanger 21 are formed as the refrigerant circulation paths.

  The outdoor air conditioning controller 26 is configured by a general-purpose microcomputer, and controls the equipment of the air conditioning system unit 6 on the outdoor unit 12 side based on the outside air temperature and the refrigerant pressure. The indoor side air conditioning controller 28 is composed of a general-purpose microcomputer and controls the equipment on the indoor unit 11 side based on a user instruction input via a remote controller (not shown) or Data communication such as information according to a user instruction is performed. The blower 24 is a blower that blows outside air to the heat source side heat exchanger 16, and the blower 15 is a blower that sends room air to the use side heat exchanger 27.

  On the other hand, the cooling system unit 8 includes a refrigeration case 3 or a refrigeration case 4 serving as a cooling storage facility, and a cooling refrigerant circuit 9 provided between the outdoor unit 12. The cooling refrigerant circuit 9 includes a refrigeration evaporator 43 provided in the refrigeration case 3, a refrigeration evaporator 49 provided in the refrigeration case 4, and a condenser (heat exchanger) 38 installed in the outdoor unit 12. The refrigeration cycle is performed by the cooling compressor 37 and the pressurizing compressor 54.

  The cooling compressor 37 mainly plays a role of refrigerant circulation, and the discharge side of the cooling compressor 37 is connected to one inlet of a four-way valve 39 via an oil separator 31. One outlet is connected to the inlet of the condenser 38. The condenser 38 includes an inlet side 38A having a relatively small flow resistance composed of a large number of parallel pipes, and an outlet side 38B in which these are aggregated into a small number of parallel pipes or a single pipe. The outlet on the outlet side 38B of the condenser 38 is connected to the inlet of the receiver tank 36, and the outlet of the receiver tank 36 is connected to one inlet of the four-way valve 41. That is, the receiver tank 36 is connected to the refrigerant downstream side of the condenser 38.

  One outlet of the four-way valve 41 is connected to the inlet of the case side passage 21 </ b> B of the cascade heat exchanger 21. Further, the outlet of the case side passage 21B of the cascade heat exchanger 21 is connected to the other inlet of the four-way valve 39, and the other outlet of the four-way valve 39 is connected to the other inlet of the four-way valve 41. . The other outlet of the four-way valve 41 exits from the outdoor unit 12 and branches into the room 2 (inside the store). One of the branched pipes is connected to the inlet of the refrigeration evaporator 43 of the refrigeration case 3 through an electromagnetic valve 46 and an expansion valve 44. The other is connected to the inlet of the freezing evaporator 49 of the freezing case 4 through the electromagnetic valve 52 and the expansion valve 51.

  The outlet of the freezing evaporator 49 is connected to the suction side of the boosting compressor 54 via the check valve 30. The pressurizing compressor 54 is for increasing the pressure of the refrigerant that has passed through the refrigeration case 4 to the refrigerant pressure that has passed through the refrigeration case 3, and is a compressor having a smaller output than the cooling compressor 37. The discharge side of the pressurizing compressor 54 is connected to one inlet of the four-way valve 42 through the oil separator 45, and one outlet of the four-way valve 42 is connected to the outlet side of the refrigeration evaporator 43. It is connected to the suction side of the cooling compressor 37. That is, the boosting compressor 54 and the cooling compressor 37 are connected in series on the refrigerant circuit. The other inlet of the four-way valve 42 is connected to a pipe line on the inlet side of the pressurizing compressor 54, and the other outlet of the four-way valve 42 is connected to the case side of the cascade heat exchanger 21 via a check valve 61. It is connected to a pipe line on the inlet side of the passage 21B. The check valve 61 has a forward direction on the cascade heat exchanger 21 side.

  In the above configuration, among the components of the cooling system section 8, the boosting compressor 54, the check valve 30, the oil separator 45, and the four-way valve 42 are separate units from the outdoor unit 12 that houses the cooling compressor 37. Of the booster unit 22. By switching the four-way valve 42 accommodated in the booster unit 22, the refrigerant (cooling refrigerant) discharged from the refrigeration evaporator 43 and the refrigeration evaporator 49 is transferred to each compressor ( A bypass path that leads to the inlet of the cascade heat exchanger 21 can be formed without going through the cooling compressor 37 or the boosting compressor 54). According to this, when one of the cooling compressor 37 and the boosting compressor 54 fails, the refrigerant flowing out of the refrigeration evaporator 43 and the refrigeration evaporator 49 breaks down by switching the four-way valve 42. It can be led to the inlet of the cascade heat exchanger 21 via a compressor that is not.

  The outdoor side cooling controller 32 is composed of a general-purpose microcomputer, and controls the equipment of the cooling system unit 8 on the outdoor unit 12 side based on the outside air temperature and the refrigerant pressure. The refrigeration case controller 50 is composed of a general-purpose microcomputer, and controls the equipment of the cooling system unit 8 based on the internal temperature of the refrigeration case 3. The refrigeration case controller 55 is constituted by a general-purpose microcomputer, and controls the equipment of the cooling system unit 8 based on the internal temperature of the refrigeration case 4. The blower 35 is a blower that blows outside air to the condenser 38, the blower 20 is a blower that sends the air in the refrigerator case 3 to the condenser 38, and the blower 25 is frozen to the freezing evaporator 49. This is a blower for sending the air in the case 4.

  The air conditioning refrigeration apparatus 1 has a main controller 56. The main controller 56 is composed of a general-purpose microcomputer, and performs data communication with the outdoor side air conditioning controller 26, the indoor side air conditioning controller 28, the outdoor side cooling controller 32, the refrigeration case controller 50, and the freezing case controller 55. In this air-conditioning refrigerating apparatus 1, different refrigerants are used in the air-conditioning refrigerant circuit 7 and the cooling refrigerant circuit 9, for example, R410A is used in the air-conditioning refrigerant circuit 7, and the cooling refrigerant circuit 9 R404A having a higher boiling point than R410A is used. Thus, since this air-conditioning refrigeration apparatus 1 can use the optimal refrigerant | coolant for each refrigerant circuit, respectively, it can raise the freedom degree of circuit design.

  As shown in FIG. 3, a glass 64 is stretched on the front of the store so that the inside 2 of the store can be seen from outside, and an entrance 60 for entering and exiting the store is provided on the right side of the front of the store. Is provided. When entering the store 2 from the entrance / exit 60, a book shelf 62 for placing books and the like along the glass 64 is arranged. A cash register counter 65 is provided on the right wall surface of the entrance / exit 60, and a walk-in showcase 3B and a freezing case 4 are provided on the left wall surface of the entrance / exit 60. Furthermore, an open showcase 3A is arranged on the wall surface facing the entrance 60 side, and a display shelf 63 for displaying products is provided in the center of the store. An outdoor unit 12 is disposed outside the store 2, and the outdoor unit 12 is provided with a refrigerated case 3 (open showcase 3 </ b> A, walk-in showcase 3 </ b> B) and refrigeration disposed in the store 2 via a cooling refrigerant circuit 9. It is connected to the case 4. The outdoor unit 12 is connected to the indoor unit 11 via the air conditioning refrigerant circuit 7. The open showcase 3A has an opening formed on the front surface thereof and is not provided with a door that separates the outside of the store from the inside of the store, so that cool air (air curtain) is blown from above the open showcase 3A downward. This air curtain separates the outside of the cabinet from the inside of the cabinet. Thereby, the internal temperature of the open showcase 3A is maintained at a temperature in a substantially constant range (+ 3 ° C. to + 10 ° C.) without being influenced by the outside temperature.

  As shown in FIG. 4, the indoor unit 11 is provided on a ceiling surface 75 so as to cover a ceiling body 74 and a unit body 72 housed in a ceiling interior 71 in the store and disposed on the lower surface of the unit body 72. And a decorative panel 76. The unit main body 72 accommodates the blower 15 and the use side heat exchanger 27 disposed so as to surround the blower 15. The decorative panel 76 has a square appearance shape with substantially equal lengths on the four sides. The decorative panel 76 is substantially the same size as a conventional decorative panel having a four-way outlet, and is configured to be replaceable with a conventional decorative panel. A suction port 77 for sucking in the air in the store is formed at the approximate center of the decorative panel 76, and a blower port 78 through which the air heat-exchanged in the use side heat exchanger 27 is blown out is formed. . A flap 79 is attached to the air outlet 78 to change the direction of the air to be blown out.

  The air outlet 78 is formed along a side other than the side of the decorative panel 76 facing the open showcase 3A or the walk-in showcase 3B when the indoor unit 11 is arranged in the store. Specifically, as shown in FIG. 5, among the four sides 76 </ b> A to 76 </ b> D of the decorative panel, the outlets along the sides 76 </ b> A and 76 </ b> D on the side not facing the open showcase 3 </ b> A and the walk-in showcase 3 </ b> B. 78A and 78D are formed. That is, these air outlets 78A and 78D are formed along two adjacent sides 76A and 76D of the decorative panel 76.

  According to this, since the blowout port 78 of the indoor unit 11 is not formed along the side 76C of the decorative panel 76 facing the open showcase 3A, the temperature of the blowout through the blowout port 78 is adjusted. Air does not hit the air curtain of the open showcase 3A, and it is possible to prevent disturbance from occurring. Therefore, the internal temperature of the open showcase 3A can be kept within a certain range (+ 3 ° C. to + 10 ° C.) without being affected by the wind blown from the indoor unit 11.

  Further, since the walk-in showcase 3B is provided with a door that separates the inside and the outside of the warehouse, the temperature-controlled air blown through the air outlet 78 gives a disturbance compared to the open showcase 3A. The impact is small. However, by not forming the air outlet 78 along the side 76B of the decorative panel 76 facing the walk-in showcase 3B, it is possible to prevent the occurrence of disturbance when opening and closing the door of the walk-in showcase 3B. .

  In addition, in the said structure, although the area of the blower outlet 78 is small compared with the decorative panel provided with the conventional 4 direction blower outlet, it is set as the structure which can adjust an air volume by the tap setting of the indoor side air-conditioning controller 28. Therefore, the air volume blown out from the air outlets 78A and 78D of the indoor unit 11 does not change.

  Next, the operation of the air conditioning refrigeration apparatus 1 will be described.

  In this air-conditioning refrigerating apparatus 1, the air-conditioning system section 6 includes a set temperature instructed by the outdoor-side air-conditioning controller 26 and the indoor-side air-conditioning controller 28 via a remote controller (not shown), and a temperature provided in the indoor unit 11B. A cooling operation or a heating operation is performed according to the deviation from the temperature in the store 2 (room temperature TA) detected by the sensor 70, and the room temperature is air-conditioned to the set temperature. In addition, the cooling system unit 8 sets the internal temperature of the refrigeration case 3 to a preset refrigeration temperature under the control of the outdoor side cooling controller 32, the refrigeration case controller 50, and the refrigeration case controller 55. The inside temperature is set to a preset freezing temperature.

More specifically, in this air-conditioning refrigeration apparatus 1, the main controller 56 performs data communication with each of the controllers 26, 28, 32, 50, 55, so that data relating to the current operating state of the air-conditioning system unit 6 and the cooling system unit 8. , And based on the received data, an optimal operation pattern at that time, which will be described later, is determined, and data relating to the optimal operation pattern and operation data of each device are transmitted to the controllers 26, 28, 32, 50, 55. . Each controller 26, 28, 32, 50, 55 executes a control operation to be described later based on the data received from the main controller 56.
(1) Cooling operation of the air conditioning system section First, if the outdoor air conditioning controller 26 determines that the cooling operation of the air conditioning system section 6 is optimal, the outdoor side air conditioning controller 26 is directed to the indoor air conditioning controller 28 and the main controller 56 to perform the cooling operation. While transmitting predetermined data, the main controller 56 that has received this data transmits these data to the outdoor side cooling controller 32, the refrigeration case controller 50, and the refrigeration case controller 55.

  As shown in FIG. 1, the outdoor air conditioning controller 26 communicates one inlet (a connection port with the oil separator 10) of the four-way valve 14 to one outlet (a connection port with the heat source side heat exchanger 16), The other inlet (connection port with the use side heat exchanger 27) is communicated with the other outlet (connection port with the accumulator 23). Further, the expansion valve 17 is fully opened, and the air conditioning compressors 13A and 13B are operated. The outdoor air-conditioning controller 26 controls the capacity of the air-conditioning compressor 13A by inverter-controlling the operation frequency.

  When the air-conditioning compressors 13A and 13B are operated, the high-temperature and high-pressure gas refrigerant discharged from the discharge side of the air-conditioning compressors 13A and 13B passes from the oil separator 10 through the four-way valve 14 to the heat source side heat exchanger 16. Enter the entrance 16A. Outside air is ventilated by the air blower 24 to the heat source side heat exchanger 16, and the refrigerant dissipates heat here to be condensed and liquefied. That is, in this case, the heat source side heat exchanger 16 functions as a condenser. The liquid refrigerant is branched after passing through the expansion valve 17 via the heat source side heat exchanger 16. One of the branched branches reaches the expansion valve 18, where it is throttled to a low pressure (decompressed), and then branches into the utilization side heat exchanger and evaporates there. Indoor air (air in the store) is ventilated by the blower 15 to the use side heat exchanger 27, and the indoor air is cooled by an endothermic action due to evaporation of the refrigerant. Thereby, the room 2 (inside the store) is cooled. After the low-temperature gas refrigerant exiting the use side heat exchanger 27 is merged, the circulation is repeated through the four-way valve 14, the check valve 5D, and the accumulator 23 to be supplied to the suction side of the air-conditioning compressors 13A and 13B. .

  Further, the other refrigerant branched after passing through the expansion valve 17 reaches the expansion valve 19 where it is throttled to a low pressure (decompression) and then flows into the air conditioning side passage 21A of the cascade heat exchanger 21 where it evaporates. To do. The cascade heat exchanger 21 is cooled by the endothermic action due to the evaporation of the refrigerant in the air-conditioning refrigerant circuit 7 and becomes a low temperature. The low-temperature gas refrigerant exiting the cascade heat exchanger 21 repeats circulation supplied to the suction side of the air-conditioning compressors 13A and 13B via the accumulator 23.

  The indoor side air conditioning controller 28 uses the use side heat so that the temperature of the room (inside the store) 2 is set to a preset temperature based on the air temperature in the store 2 detected via a temperature sensor (not shown). The blower 15 that ventilates the exchanger 27 is controlled. Information of the indoor air conditioning controller 28 is transmitted to the outdoor air conditioning controller 26, and the outdoor air conditioning controller 26 controls the operation of the air conditioning compressors 13A and 13B based on this information.

  The outdoor air-conditioning controller 26 detects the refrigerant temperature at the entrance / exit of the use side heat exchanger 27 or the temperature of the use side heat exchanger 27 detected via a temperature sensor (not shown) and the entrance / exit of the cascade heat exchanger 21. Based on the refrigerant temperature or the temperature of the cascade heat exchanger 21, the valve openings of the expansion valves 18 and 19 are adjusted so as to obtain an appropriate degree of superheat.

  On the other hand, the outdoor-side cooling controller 32 supplies one inlet of the four-way valve 39 of the cooling refrigerant circuit 9 of the cooling system unit 8 to supply the high-temperature and high-pressure gas refrigerant discharged from the cooling compressor 37 to the condenser 38. (The connection port with the oil separator 31) communicates with one outlet (the connection port with the condenser 38), and the other inlet (the connection port with the cascade heat exchanger 21) communicates with the other outlet (the four-way valve 41). Connect to the connection port.

  In addition, the outdoor side cooling controller 32 uses one inlet (a connection port with the four-way valve 39) of the four-way valve 41 as one outlet (refrigeration) in order to supply the gas refrigerant that has passed through the condenser 38 to the cascade heat exchanger 21. Communication with the evaporator 43 and the refrigeration evaporator 49 (connection ports with the electromagnetic valves 46, 47, 52), and the other inlet (connection port with the receiver tank 36) is connected with the other outlet (cascade heat exchanger 21). Communication port). Then, the cooling compressor 37 and the boosting compressor 54 are operated.

  Thus, the high-temperature and high-pressure gas refrigerant discharged from the cooling compressor 37 is separated by the oil separator 31 and then enters the inlet side 38A of the condenser 38 through the four-way valve 39. Outside air is passed through the condenser 38 by the blower 35, and the refrigerant flowing into the condenser 38 dissipates heat and condenses. The refrigerant discharged from the condenser 38 enters the receiver tank 36 and is temporarily stored therein to separate the gas / liquid. The separated liquid refrigerant exits from the receiver tank 36 and passes through the four-way valve 41, and then enters the case side passage 21B of the cascade heat exchanger 21. The refrigerant in the cooling refrigerant circuit 9 supplied to the cascade heat exchanger 21 is cooled by the cascade heat exchanger 21 that is at a low temperature due to evaporation of the refrigerant in the air conditioning refrigerant circuit 7 as described above, and further subcooled. The Since the receiver tank 36 is disposed immediately after the condenser 38 as described above, heat loss during supercooling can be eliminated and the amount of refrigerant can be adjusted.

  The refrigerant supercooled in the cascade heat exchanger 21 is branched after sequentially passing through the four-way valves 39 and 41, and one of the refrigerant passes through the electromagnetic valve 46 and reaches the expansion valve 44. ), Flows into the refrigeration evaporator 43 and evaporates there. In the refrigerator 43 for refrigeration, the air in the refrigerator case 3 is ventilated and circulated by the blower 20, and the air in the refrigerator is cooled by an endothermic action due to evaporation of the refrigerant. Thereby, the inside cooling of the refrigeration case 3 is performed. The low-temperature gas refrigerant exiting the refrigeration evaporator 43 reaches the outlet side of the oil separator 45 of the pressurizing compressor 54.

  The other refrigerant that is subcooled and branched in the cascade heat exchanger 21 passes through the electromagnetic valve 52 to reach the expansion valve 51, where it is throttled (decompression) and then supplied to the refrigeration evaporator 49. Where it evaporates. The refrigeration evaporator 49 is circulated and circulated with the air in the refrigeration case 4 by the blower 25, and the refrigeration evaporator 49 is cooled by the endothermic effect of the evaporation of the refrigerant. Thereby, the inside cooling of the freezing case 4 is performed.

  The low-temperature gas refrigerant that has exited the freezing evaporator 49 is branched, and one of the refrigerant passes through the check valve 30 and reaches the pressurizing compressor 54 where it is compressed and pressure on the outlet side of the refrigerating evaporator 43 (refrigeration system). After the pressure is raised to the low pressure side pressure), the oil is discharged from the pressure boosting compressor 54 and separated by the oil separator 45, and then merged with the refrigerant from the refrigeration evaporator 43. The merged refrigerant repeats circulation that is sucked into the suction side of the cooling compressor 37. The other flows into the cascade heat exchanger 21 via the four-way valve 42 and the check valve 61.

  The refrigeration case controller 50 detects the temperature inside the refrigeration case 3 detected via a temperature sensor (not shown), the cold air temperature discharged through the refrigeration evaporator 43, or the cold air temperature sucked into the refrigeration evaporator 43, and the refrigeration case controller 50. The valve opening degree of each expansion valve 44 is controlled based on the refrigerant temperature on the outlet side of the evaporator 43 or the temperature of the refrigeration evaporator 43. Thereby, it is set as the appropriate superheat degree (constant superheat degree), maintaining the inside of the refrigerator | coolant case 3 cooling at the refrigeration temperature mentioned above. Further, the refrigeration case controller 55 is configured such that the internal temperature of the refrigeration case 4, the cold air temperature discharged through the refrigeration evaporator 49, the cold air temperature sucked into the refrigeration evaporator 49, and the refrigerant temperature on the outlet side of the refrigeration evaporator 49. Alternatively, the valve opening degree of the expansion valve 51 is controlled based on the temperature of the refrigeration evaporator 49. As a result, while maintaining the inside of the freezing case 4 to be cooled to the above-described freezing temperature, an appropriate degree of superheat (constant superheat) is obtained.

  The outdoor cooling controller 32 cools based on the pressure on the suction side of the cooling compressor 37 (low pressure of the cooling refrigerant circuit 9) when any of the expansion valves 44 and 51 is open. The operation frequency of the compressor 37 is controlled, and the operation of the cooling compressor 37 is stopped when all the expansion valves 44 and 51 are fully closed.

  According to this, during the cooling operation, the low-pressure side refrigerant flowing through the air-conditioning refrigerant circuit 7 is supplied to the cascade heat exchanger 21, and the high-pressure side refrigerant flowing through the cooling refrigerant circuit 9 is supercooled. The cooling capacity and operation efficiency of the part 8 can be improved.

Note that the pressure of the refrigerant discharged from the refrigeration evaporator 49 of the cooling refrigerant circuit 9 is lower than that of the refrigerant discharged from the refrigeration evaporator 43 because the evaporation temperature thereof is lower, but the refrigerant discharged from the refrigeration evaporator 43 is reduced. Since it is compressed by the pressurizing compressor 54 before joining with the refrigerant, the pressurizing compressor is used while cooling each case to an appropriate temperature even when it is controlled to a different internal temperature such as the refrigerated case 3 and the freezing case 4. 54, the pressure of the refrigerant sucked into the cooling compressor 37 can be made uniform, and the operation can be performed without any trouble.
(2) Heating operation of the air conditioning system unit Next, the heating operation of the air conditioning system unit will be described with reference to FIG.

  First, when the outdoor air conditioning controller 26 determines that the heating operation of the air conditioning system unit 6 is optimal, the outdoor air conditioning controller 26 transmits predetermined data to the indoor air conditioning controller 28 and the main controller 56 to perform the heating operation. The main controller 56 that has received the data transmits these data to the outdoor side cooling controller 32, the refrigeration case controller 50, and the freezing case controller 55.

  The outdoor air conditioning controller 26 communicates one inlet (a connection port with the oil separator 10) of the four-way valve 14 to one outlet (a connection port with the accumulator 23) in order to reverse the refrigerant flow to that during the cooling operation. The other inlet (connection port with the use side heat exchanger 27) is communicated with the other outlet (connection port with the heat source side heat exchanger 16). Further, the expansion valve 17 is fully closed and the expansion valve 18 is fully opened, and the air conditioning compressors 13A and 13B are operated.

  When the air-conditioning compressors 13A and 13B are operated, the high-temperature and high-pressure gas refrigerant discharged from the discharge side of the air-conditioning compressors 13A and 13B is supplied to the use-side heat exchanger 27 via the four-way valve 14. The use side heat exchanger 27 is ventilated with room air by the blower 15, and the refrigerant dissipates heat here and heats the room air while condensing. Thereby, the room (inside the store) is heated.

  The refrigerant liquefied by the use side heat exchanger 27 is reduced in pressure through the expansion valve 18 and the expansion valve 19 in order (decompression), and then flows into the air conditioning side passage 21A of the cascade heat exchanger 21 and evaporates there. After the heat is absorbed, the circulation supplied to the suction side of the air-conditioning compressors 13A and 13B through the accumulator 23 is repeated.

  The outdoor side air conditioning controller 26 adjusts the valve opening degree of the expansion valves 18 and 19 so as to achieve an appropriate degree of superheat based on the refrigerant temperature at the entrance and exit of the cascade heat exchanger 21 or the temperature of the cascade heat exchanger 21. . Further, the indoor side air conditioning controller 28 uses the use side heat exchanger so that the temperature of the room (inside the store) 2 is set to a preset temperature based on the temperature of the use side heat exchanger 27 and the temperature of the air sucked therein. The blower 15 that ventilates the ventilator 27 is controlled.

  On the other hand, the outdoor side cooling controller 32 uses one inlet (a connection port with the oil separator 31) of the four-way valve 39 of the cooling refrigerant circuit 9 of the cooling system unit 8 as one outlet (a connection port with the four-way valve 41). The other inlet (connection port with the cascade heat exchanger 21) is communicated with the other outlet (connection port with the condenser 38). In addition, the outdoor side cooling controller 32 uses one inlet (a connection port with the four-way valve 39) of the four-way valve 41 as one outlet (a refrigeration evaporator 43 and a freezing evaporator 49 (solenoid valves 46, 47, 52)). And the other inlet (connection port with the receiver tank 36) is communicated with the other outlet (connection port with the cascade heat exchanger 21). Then, the cooling compressor 37 and the boosting compressor 54 are operated.

  Accordingly, the high-temperature and high-pressure gas refrigerant discharged from the cooling compressor 37 is supplied to the case side passage 21 </ b> B of the cascade heat exchanger 21 through the four-way valves 39 and 41. That is, the high-temperature and high-pressure gas refrigerant discharged from the cooling compressor 37 is supplied to the cascade heat exchanger 21 after passing through the condenser 38 in the cooling operation, whereas it is cascaded before going to the condenser 38. It is supplied to the heat exchanger 21.

  The refrigerant in the cooling refrigerant circuit 9 supplied to the cascade heat exchanger 21 is cooled by the cascade heat exchanger 21 that is at a low temperature due to evaporation of the refrigerant in the air conditioning refrigerant circuit 7 as described above, and further subcooled. The In other words, the refrigerant in the air conditioning refrigerant circuit 7 can pump up heat from the refrigerant in the cooling refrigerant circuit 9.

  The refrigerant that has passed through the case side passage 21 </ b> B of the cascade heat exchanger 21 enters the inlet side 38 </ b> A of the condenser 38 through the four-way valve 39. Outside air is passed through the condenser 38 by the blower 35, and the refrigerant flowing into the condenser 38 dissipates heat and condenses.

  The refrigerant discharged from the condenser 38 enters the receiver tank 36 and is temporarily stored therein to separate the gas / liquid. The separated liquid refrigerant exits from the receiver tank 36, passes through the four-way valve 41, and is branched, and goes to the electromagnetic valves 46 and 52 in the same manner as described above.

  By the above operation, even during the heating operation of the air conditioning refrigerant circuit 7, the low-pressure side refrigerant flowing through the air-conditioning refrigerant circuit 7 is supplied to the cascade heat exchanger 21, and the high-pressure side refrigerant flowing through the cooling refrigerant circuit 9 is excessively passed. By cooling, the cooling capacity of the refrigeration evaporators 43 and 44 of the refrigeration case 3 and the refrigeration case 4 and the operation efficiency of the cooling system unit 8 can be improved.

  Furthermore, during the heating operation, the refrigerant in the air conditioning refrigerant circuit 7 pumps up heat from the refrigerant in the cooling refrigerant circuit 9 in the cascade heat exchanger 21, so that the heating capacity of the air conditioning system unit 6 can be improved. The efficiency of the entire air conditioning refrigeration apparatus 1 that performs indoor air conditioning and cooling of the refrigerator case 3 and the refrigeration case 4 can be improved to save energy.

  Particularly in this case, the refrigerant on the high-pressure side of the cooling refrigerant circuit 9 is supplied to the cascade heat exchanger 21 before the condenser 38, so that exhaust heat recovery from this refrigerant is efficiently performed, and the air conditioning refrigerant circuit 7 The heating capacity can be further improved.

  In the present embodiment, in the operation control of (1) and (2) above, the air outlet 78 of the indoor unit 11 is along the side of the decorative panel 76 on the side not facing the open showcase 3A or the walk-in showcase 3B. By being formed, the temperature-controlled air blown out from the air outlet 78 does not become a disturbance of the cooling storage facility, so the load of the open showcase 3A and the walk-in showcase 3B is stabilized, and the cooling compressor 37 Can be controlled within an efficient rotation frequency range. Therefore, the energy consumption efficiency of the cooling system unit 8 can be improved.

  Furthermore, in the cascade heat exchanger 21, when heat exchange is promoted between the low-pressure side refrigerant of the air-conditioning system unit 6 and the high-pressure side refrigerant of the cooling system unit 8, the load on the cooling side is stabilized, Driving is stable. Usually, when the energy consumption efficiency of the air conditioning system unit 6 and the energy consumption efficiency of the cooling system unit 8 are compared, the energy consumption efficiency of the air conditioning system unit 6 is excellent, and therefore, more heat exchange in the cascade heat exchanger 21 is promoted. In this case, the efficiency of the entire system can be improved by that amount, and the energy consumption efficiency can be improved.

  Moreover, in this embodiment, since the decorative panel 76 is comprised so that replacement | exchange is possible with the decorative panel provided with the conventional 4 direction blower outlet, according to the arrangement | positioning condition of the open showcase 3A and the walk-in showcase 3B in a store. Thus, by exchanging with the decorative panel 76 having the air outlet 78 on the side other than the side facing the cooling storage facility 3, as described above, the efficiency of the entire air conditioning refrigeration apparatus 1 is improved, and the energy consumption efficiency is increased. Can be improved.

  In the present embodiment, the indoor unit 11 has a configuration in which the air outlet 78 is formed along a side other than the side of the decorative panel 76 facing the open showcase 3A and the walk-in showcase 3B. It is not necessary to block some of the air outlets of the decorative panel having the four-way air outlets with a wind shield or the like, and the appearance of the decorative panel design is improved.

  In the present embodiment, as shown in FIG. 5, the air outlets 78 </ b> A and 78 </ b> D are formed along two adjacent sides 76 </ b> A and 76 </ b> D of the decorative panel 76, but an arcuate opening having a central angle of approximately 90 °. It is good also as a structure provided with the blower outlet 80 formed by. In this configuration, as shown in FIG. 6, the wind can be blown not only in the direction perpendicular to the two sides 76A and 76D of the decorative panel 76 but also from the arc-shaped opening. Since air exchanged heat in the store 2 is diffused as soon as possible, the air conditioning efficiency can be improved.

  In the present embodiment, the air outlet 78 has been described as being configured along the side of the decorative panel 76 on the side not facing the open showcase 3A or the walk-in showcase 3B. Since the same applies to, the description is omitted.

  Although one embodiment of the present invention has been described above, the present invention is not limited to this. For example, in the above embodiment, the case where the present invention is applied to an air-conditioning refrigeration apparatus applied to a store such as a convenience store has been described. However, air conditioning and cooling of a cooling storage facility other than the refrigeration case 3 and the refrigeration case 4 are performed. It can apply widely to the air-conditioning refrigeration apparatus to perform. Furthermore, the piping configuration shown in the above embodiment is not limited thereto, and can be appropriately changed without departing from the gist of the present invention.

  Moreover, although this embodiment demonstrated the structure which arrange | positions the air-conditioning refrigerating apparatus 1 in a convenience store, even if it is a school etc., when cooling the cooling storage equipment and the air conditioning of the space which has cooling storage equipment, for example The air-conditioning refrigeration apparatus 1 can be applied.

It is a figure which shows the system configuration | structure containing the refrigerant circuit of the air-conditioning refrigerating apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the heating operation of the air-conditioning system part of the air-conditioning refrigerating apparatus which concerns on embodiment of this invention. It is a perspective view which shows a convenience store. It is sectional drawing which shows an indoor unit internal structure. It is a figure which shows the positional relationship of the blower outlet formed in the decorative panel and cooling storage equipment. It is a figure which shows the modification of a blower outlet.

Explanation of symbols

1 Air-conditioning refrigeration equipment 2 In-store (air-conditioned room)
3 Refrigerated case (cooling storage equipment)
3A Open showcase 3B Walk-in showcase 4 Refrigerated case (cooling storage equipment)
6 Air Conditioning System Unit 8 Cooling System Unit 11 Indoor Unit 12 Outdoor Unit 13 Compression Unit 13A, 13B Air Conditioning Compressor 21 Cascade Heat Exchanger 27 User Side Heat Exchanger 37 Cooling Compressor 71 Ceiling Interior 72 Unit Body 76 Cosmetic Panel 78 Outlet

Claims (4)

An air conditioning system unit that is equipped with an air conditioning compressor, a heat source side heat exchanger, and a usage side heat exchanger and that conditioned the air-conditioned room by an indoor unit that accommodates the usage side heat exchanger, a cooling compressor, and a condenser A cooling system unit that includes a cooler and an evaporator to cool the cooling storage facility disposed in the air-conditioned room, a low-pressure air-conditioning refrigerant of the air-conditioning system unit, and a high-pressure side of the cooling system unit And a cascade heat exchanger that is thermally coupled to the cooling refrigerant of
The indoor unit includes a unit main body housed inside the ceiling of the air-conditioned room, and a decorative panel disposed on a lower surface of the unit main body, and the decorative panel faces the cooling storage facility. An air-conditioning refrigeration apparatus characterized in that an air outlet is formed along a side other than the side of the panel.   The air-conditioning refrigeration apparatus according to claim 1, wherein the air outlet is formed along two adjacent sides of the decorative panel.   The air-conditioning refrigeration apparatus according to claim 1 or 2, wherein the air outlet is formed by an arcuate opening having a central angle of approximately 90 °. The air-conditioning refrigeration apparatus according to any one of claims 1 to 3, wherein the cooling storage facility is an open showcase having an opening formed on a front surface.

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