JP2010091178A - Refrigerating device - Google Patents

Abstract

The present invention provides a refrigeration apparatus including a heat exchanger capable of suppressing deterioration in equipment performance due to scale deposition.
A refrigeration apparatus includes a scale processing control unit that performs a scale removal operation for removing scale S deposited on a water pipe in which water flows in a water heat exchanger.
[Selection] Figure 3

Description

  The present invention relates to a structure of a refrigeration apparatus including a heat exchanger for exchanging heat between water and a refrigerant.

  A heat pump unit in which a compressor, a heat exchanger, a pressure reduction mechanism, and an air heat exchanger are sequentially connected, and unheated water is supplied to a heat exchange path constituted by the water heat exchanger, and is heated in the heat exchanger. Conventionally, a hot water supply apparatus including a hot water storage unit for returning (boiling) water to a hot water storage tank has been used (for example, a hot water supply apparatus shown in Patent Document 1).

In such a hot water supply apparatus, it is possible to perform a hot water supply operation by causing the air heat exchanger provided in the refrigerant circuit to function as an evaporator and the water heat exchanger to function as a condenser.
JP 2007-271213 A

  However, the conventional hot water supply apparatus has the following problems.

  That is, when water is heated in the heat exchanger, the scale contained in the water becomes supersaturated and the scale is deposited. When the deposited scale adheres to the inner wall surface of the pipe, there is a risk that the performance of the equipment such as the heat transfer performance is lowered.

  This invention solves the said conventional subject, and it aims at providing the freezing apparatus containing the heat exchanger which can suppress the fall of the apparatus performance by precipitation of a scale.

  A refrigeration apparatus according to a first aspect of the present invention is a refrigeration apparatus including a heat exchanger that performs heat exchange between water and a refrigerant, and removes scales deposited on a water pipe through which water flows in the heat exchanger. A control unit for performing the scale removal operation is provided.

  Here, the control part which performs the scale removal driving | operation for removing the scale which precipitates in the water pipe | tube with which water distribute | circulates is provided.

  The water pipe in the heat exchanger has a problem that a supersaturated scale is deposited, and the scale adheres to the inner wall surface of the water pipe, resulting in a decrease in equipment performance such as a decrease in heat transfer performance. .

  Therefore, the refrigeration apparatus of the present invention includes a control unit that performs a scale removal operation for removing the scale separately from the normal operation.

  As a result, it is possible to remove the scale attached to the inner wall surface of the water pipe without replacement of parts or special maintenance.

  As a result, it is possible to suppress degradation of the equipment performance that occurs due to the scale adhering to the inner wall surface of the pipe.

  A refrigeration apparatus according to a second aspect of the present invention is the refrigeration apparatus according to the first aspect of the present invention, in which the scale removal operation causes the water flowing through the scale processing section in which at least water is in a predetermined temperature range in the water pipe to flow backward.

  Here, the scale adhering to the inner wall surface of the water pipe is removed by causing water to flow backward.

  Note that the range in which water flows back may be the entire water pipe, or may be limited to a range in which water reaches a predetermined temperature, that is, a range in which the scale is supersaturated.

  Thereby, a flow different from that during normal operation acts on the scale attached to the inner wall surface of the scale, and the scale can be detached from the inner wall surface.

  A refrigeration apparatus according to a third aspect of the invention is the refrigeration apparatus according to the second aspect of the invention, which is arranged in the flow path of the scale processing unit, moves by the flow of water, and a part thereof is the inner wall of the scale processing unit. And a ring-shaped brush that contacts the portion.

  Here, when the ring-shaped brush moves by the flow of water, a part of the brush moves while contacting the inner wall surface of the water pipe.

  As a result, the scale attached to the inner wall surface of the water pipe is scraped off by the brush, so that the scale can be removed.

  A refrigeration apparatus according to a fourth aspect of the present invention is the refrigeration apparatus according to any one of the first to third aspects of the present invention, wherein the scale removal operation is performed on the scale processing unit in which at least water is in a predetermined temperature range in the water pipe. Increase the flow rate of the flowing water.

  Here, the scale adhering to the inner wall surface of the water pipe is removed by increasing the flow rate of water.

  Note that the range in which the flow velocity is increased may be the entire water pipe, or may be limited to a range in which water reaches a predetermined temperature, that is, a range in which the scale is supersaturated.

  Thereby, a force larger than that during normal operation acts on the scale attached to the inner wall surface of the scale, and the scale can be detached from the inner wall surface.

  A refrigeration apparatus according to a fifth aspect of the present invention is the refrigeration apparatus according to any one of the first to fourth aspects of the present invention, wherein the scale removal operation is performed on the scale processing unit in which at least water is in a predetermined temperature range in the water pipe. Turbulent flow of flowing water.

  Here, the scale adhering to the inner wall surface of the water pipe is removed by making the water flow turbulent.

  The range of turbulent flow may be the entire water pipe, or may be limited to a range where water has a predetermined temperature, that is, a range where the scale is supersaturated.

  Thereby, a force different from that during normal operation acts on the scale attached to the inner wall surface of the scale, and the scale can be detached from the inner wall surface.

  A refrigeration apparatus according to a sixth aspect of the present invention is the refrigeration apparatus according to any one of the first to fifth aspects of the present invention, wherein the control unit is a pump that circulates water through the water pipe in order to perform the scale removal operation. To control.

  Here, for example, the scale removal operation is realized by controlling the output of the pump and the like.

  Thereby, it is possible to easily realize the scale removal operation.

  A refrigeration apparatus according to a seventh aspect is the refrigeration apparatus according to any one of the second to fifth aspects, wherein the first pipe connected to the water pipe on the upstream side of the scale processing section, and the first A first valve that opens and closes the flow path of the pipe, a second pipe that is connected to the water pipe on the downstream side of the scale processing unit, and a second valve that opens and closes the flow path of the second pipe are further provided. And a control part controls at least one of the 1st valve and the 2nd valve, in order to perform scale removal operation.

  Here, a first pipe and a first valve, and a second pipe and a second valve are provided on the upstream side and the downstream side of the scale processing unit, respectively. And the control part adjusts at least one of the flow path in the 1st piping, and the flow path in the 2nd piping, for example, and has realized scale removal operation.

  Thereby, for example, by controlling at least one of the first valve and the second valve, it is possible to realize a water amount, a flow velocity, a direction of water flow, etc. different from the normal operation, and to perform the scale removal operation. .

  According to the refrigeration apparatus according to the first aspect of the present invention, it is possible to suppress a decrease in equipment performance that occurs due to the scale adhering to the inner wall surface of the pipe.

  According to the refrigeration apparatus according to the second invention, a flow different from that during normal operation acts on the scale attached to the inner wall surface of the scale, and the scale can be detached from the inner wall surface.

  According to the refrigeration apparatus according to the third invention, the scale attached to the inner wall surface of the water pipe is scraped off by the brush, so that the scale can be removed.

  According to the refrigeration apparatus according to the fourth aspect of the invention, a larger force than that during normal operation acts on the scale attached to the inner wall surface of the scale, and the scale can be detached from the inner wall surface.

  According to the refrigeration apparatus of the fifth invention, a force different from that during normal operation acts on the scale attached to the inner wall surface of the scale, and the scale can be detached from the inner wall surface.

  According to the refrigeration apparatus according to the sixth aspect of the present invention, it is possible to easily realize the scale removal operation.

  According to the refrigeration apparatus according to the seventh aspect of the present invention, it is possible to realize a water removal amount, a flow rate, a direction of water flow, and the like different from the normal operation, and perform the scale removal operation.

  It will be as follows if the hot water supply apparatus 1 containing the water heat exchanger (heat exchanger) 22 which concerns on one Embodiment of this invention is demonstrated using FIGS.

<Configuration of heat pump hot water supply device>
A system of a heat pump hot water supply apparatus including a water heat exchanger 22 according to an embodiment of the present invention is shown in FIG. The heat pump type hot water supply apparatus 1 includes a refrigeration apparatus 2 and a hot water storage apparatus 3. The refrigeration apparatus 2 includes a compressor refrigeration circuit 20 in which a compressor 21, a refrigerant pipe 22 a in a water heat exchanger 22, an expansion valve 23 as a decompression means, and an air heat exchanger 24 are connected in a ring shape by a refrigerant pipe 25. Have

  Further, the refrigeration circuit 20 is provided with a gas heat exchanger 26 for heat exchange between the high-pressure and high-temperature refrigerant coming out of the water heat exchanger 22 and the low-pressure and low-temperature refrigerant coming out of the air heat exchanger 24. ing. Specifically, heat exchange is performed between the refrigerant passage connecting the water heat exchanger 22 and the expansion valve 23 and the refrigerant passage connecting the air heat exchanger and the compressor 21.

  The hot water storage device 3 includes a water circulation circuit 30 in which a hot water storage tank 31, a water pipe 22 b in the water heat exchanger 22, and a water circulation pump 32 are annularly connected by a water pipe 35.

  The refrigeration apparatus 2 is provided with an outside air temperature sensor 8 that detects the outside air temperature at the installation location, a discharge pipe temperature sensor 9 that detects the discharge pipe temperature of the compressor 21, and a temperature sensor 10 that detects the temperature of the air heat exchanger 24. The detection signals of these sensors are input to the microcomputer 6. Then, the water circulation amount is controlled by the water circulation pump 32 so that the temperature of the water heated by the water heat exchanger 22 becomes a predetermined temperature. The microcomputer 6 controls the opening degree of the expansion valve 23 in order to ensure the refrigerant temperature necessary for obtaining water at a predetermined temperature.

<Structure of refrigeration equipment>
FIG. 2 is a cross-sectional view showing the internal structure of the refrigeration apparatus 2. In FIG. 2, the right compartment of the heat insulation wall 2c is the machine room 2a, and the left compartment of the heat insulation wall 2c is the fan room 2b. A compressor 21 and an expansion valve 23 are arranged in the machine room 2a.

  In the fan chamber 2b, a fan 27 is disposed in the front in the front view of FIG. A motor that drives the fan 27 is disposed behind the fan 27 in a state of being fixed to the motor support base 28. A water heat exchanger 22 is disposed below the fan chamber 2b with a heat insulating wall 2d interposed therebetween. In the water heat exchanger 22, heat exchange is performed between the refrigerant flowing through the refrigerant pipe 22a (see FIG. 1) and the water flowing through the water pipe 22b (see FIG. 1).

  In FIG. 2, the air heat exchanger 24 is disposed along the left side wall and the back wall of the fan chamber 2b, and the right end of the air heat exchanger 24 extends to the center of the machine chamber 2a. The control box 4 is disposed so as to straddle the upper part of the machine room 2a and the upper part of the fan room 2b. The control box 4 incorporates a control device 5 equipped with a microcomputer 6 (see FIG. 4) and an inverter 7 (see FIG. 4).

<Operation control of refrigeration equipment>
FIG. 3 is a control block diagram of the refrigeration apparatus 2. The microcomputer 6 sets the target discharge pipe temperature at the target discharge pipe temperature setting unit 62 based on detection signals from the outside air temperature sensor 8 and the temperature sensor 10 of the air heat exchanger 24. The microcomputer 6 controls the opening of the expansion valve 23 via the expansion valve opening controller 63 so that the discharge pipe temperature detected by the discharge pipe temperature sensor 9 approaches the target discharge pipe temperature. Data necessary for setting the target discharge pipe temperature is stored in advance in the target discharge pipe temperature setting unit 62.

  Further, the microcomputer 6 considers the influence of the outside air temperature on the capacity of the refrigeration apparatus 2 and further considers that the hot water supply load changes depending on the time zone of the day. The operation frequency is controlled. For example, in a time zone in which the outside air temperature is low and the hot water supply load is large, the operating frequency of the compressor 21 is increased by ignoring the efficiency in order to prevent hot water shortage. On the other hand, in the time zone when the outside air temperature is high and the hot water supply load is small, the operating frequency of the compressor 21 is set to a high efficiency point.

  When the hot water supply load is large, the microcomputer 6 controls the operation of the compressor 21 so that the discharge pipe temperature does not exceed 120 ° C. for the purpose of protecting the compressor 21. Actually, when the discharge pipe temperature is 120 ° C., the internal temperature of the compressor 21 reaches 140 ° C. to 145 ° C. When the internal temperature further rises and exceeds 150 ° C., the magnet inside the compressor 21 The magnetic force of the oil drops and oil deterioration occurs, leading to failure. Therefore, in this embodiment, the upper limit of the discharge pipe temperature is set to 120 ° C.

  However, when the outside air temperature t1 is −20 ° C. or less, the compressor 21 is likely to be overloaded. Therefore, as a further safety measure, the correction value of the detection value of the discharge pipe temperature sensor 9 is increased, and the actual discharge pipe temperature is reduced. Before reaching 120 ° C., the detection value of the discharge pipe temperature sensor 9 needs to be 120 ° C. Therefore, the correction amount when the outside air temperature t1 is −20 ° C. or less is obtained experimentally and stored in the second correction means 61b of the temperature correction unit 61 of the microcomputer 6. In the temperature range of the outside air temperature t1> −20 ° C., the correction is made by the first correcting means 61a.

<Structure of water heat exchanger>
Here, the structure of the water heat exchanger 22 is demonstrated using FIG. 4, FIG. Here, FIG. 4 shows the configuration of the water heat exchanger 22, and FIG. 5 shows the configuration of the main part of the water heat exchanger 22.

The water heat exchanger 22 includes a refrigerant pipe 22a, a water pipe 22b, a scale processing unit 40, a first pipe 43, a first valve 44, a second pipe 45, and a second valve 46. .

  The refrigerant pipe 22a is a circular pipe having a circular cross section through which the refrigerant flows. As shown in FIG. 4, the refrigerant tube 22a of this embodiment is branched into two first and second refrigerant thin tubes 221a and 222a and wound around a water tube 22b described later. The first and second refrigerant thin tubes 221a and 222a are spirally parallel to each other along the longitudinal direction and spaced apart from each other on the outer peripheral surface of the water tube 22b at a predetermined interval and having a predetermined winding angle. It is wound. Note that carbon dioxide is passed as refrigerant gas through the refrigerant pipe 22a of the present embodiment.

  The water pipe 22b is a circular pipe having a circular cross section through which water is circulated, and has a predetermined length and a predetermined inner diameter d2.

  With the above-described configuration, the water heat exchanger 22 can gradually heat the water that has entered from the inflow side 22aa, and can bring the water that exits from the outflow side 22ab to a desired temperature.

  In the present embodiment, “upstream side” and “downstream side” mean upstream and downstream with respect to the flow of water during normal operation. As described above, the temperature of the downstream water is the downstream side. It becomes higher than the temperature of water.

  The scale processing unit 40 is disposed in a part of the water pipe 22b. The scale processing unit 40 is disposed at a position where the water flowing through the water pipe 22b is in a predetermined temperature range, that is, at a temperature range where the scale S contained in the water flowing through the water pipe 22b is in a supersaturated state. Specifically, for example, when the water having hardness 200 is circulated through the water pipe 22b, the scale processing unit 40 is provided at a position where the water flowing through the water pipe 22b reaches 65 ° C.

  As a result, the scale S can be selectively deposited at the position where the scale processing unit 40 is disposed, and the scale S adheres to the inner wall surface 40 a of the scale processing unit 40.

  Moreover, the inner diameter d1 of the scale processing unit 40 is formed larger than the inner diameter d2 of the water pipe 22b. Thereby, even if the scale S adheres to the inner wall surface 40a, it is possible to prevent the flow path from being blocked in the scale processing unit 40.

  The first pipe 43 is a water channel connecting the upstream side of the scale processing unit 40 in the water pipe 22b and the hot water storage tank 31, and circulates water from the hot water storage tank 31 side to the scale processing unit 40 side.

  The first valve 44 is provided on the first pipe 43 and opens and closes the flow path of the first pipe 43 to adjust the amount of water flowing from the hot water storage tank 31 side to the scale processing unit 40 side. The opening / closing of the first valve 44 is controlled by the scale processing control unit 65.

  The second pipe 45 is a water channel connecting the downstream side of the scale processing unit 40 in the water pipe 22b and the hot water storage tank 31, and distributes water from the scale processing unit 40 side to the hot water storage tank 31 side.

  The second valve 46 is provided on the second pipe 45 and opens and closes the flow path of the second pipe 45 to adjust the amount of water flowing from the scale processing unit 40 side to the hot water storage tank 31 side. The opening / closing of the second valve 46 is controlled by the scale processing control unit 65.

<Scale removal operation>
Here, the scale removal operation performed by the scale processing control unit 65 will be described. The scale removal operation referred to here is an operation for removing the scale S deposited on the scale processing unit 40, and is different from the normal operation. Specifically, the scale processing control unit 65 opens the plugs of the first valve 44 and the second valve 46 more than in normal operation, so that the flow rate of water flowing through the scale processing unit 40 becomes faster than in normal operation. I am doing so.

  Thereby, the scale S adhering to the inner wall surface 40a of the scale processing unit 40 can be peeled off using the flow of water.

[Features of the refrigeration apparatus 2]
(1)
The refrigeration apparatus 2 of the present embodiment includes a scale processing control unit 65 that performs a scale removal operation for removing the scale S deposited on the water pipe 22b through which water flows in the water heat exchanger 22. Accordingly, the scale S attached to the inner wall surface 40a of the scale processing unit 40 can be removed without performing parts replacement or special maintenance. As a result, it is possible to suppress degradation of the equipment performance that occurs when the scale S adheres to the inner wall surface 40a of the scale processing unit 40.

(2)
In the refrigeration apparatus 2 of the present embodiment, the scale S adhering to the inner wall surface 40 a of the scale processing unit 40 is removed by increasing the flow rate of the water flowing through the scale processing unit 40. Thereby, a force larger than that during normal operation acts on the scale S attached to the inner wall surface 40a of the scale processing unit 40, and the scale S can be detached from the inner wall surface 40a.

(3)
In the refrigeration apparatus 2 of the present embodiment, a first pipe 43 and a first valve 44, and a second pipe 45 and a second valve 46 are provided on the upstream side and the downstream side of the scale processing unit 40, respectively. The scale processing control unit 65 adjusts the first valve 44 and the second valve 46 to realize a scale removal operation. Thereby, in the scale process part 40, the flow rate different from a normal driving | operation is implement | achieved, and it is possible to perform a scale removal driving | operation.

(4)
In the refrigeration apparatus 2 of the present embodiment, the scale processing unit 40 is provided at a position where the scale S included in the water flowing through the water pipe 22b is in a supersaturated state. Accordingly, the first valve 44 and the second valve 46 are provided on the upstream side and the downstream side of the scale processing unit 40, and the scale removal operation can be locally performed at the position where the scale S is deposited. .

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the refrigeration apparatus 2 of the above-described embodiment, the scale processing unit 40 is disposed, and the scale removal operation is locally performed on the scale processing unit 40. However, the present invention is not limited to this.

  For example, instead of the scale processing unit, valves may be installed on the upstream side and the downstream side of an arbitrary section in the water pipe, and the control unit may control the opening degree of the valve. Even in this case, the scale attached to the inner wall surface of an arbitrary section can be removed.

(B)
In the refrigeration apparatus 2 of the above embodiment, the first valve 44 and the second valve 46 are provided, and the scale processing control unit 65 controls the first valve 44 and the second valve 46 to realize the scale processing operation. I gave it as an explanation. However, the present invention is not limited to this.

  For example, as shown in FIG. 6, the refrigeration apparatus 102 does not have the first pipe 43, the first valve 44, the second pipe 45, and the second valve 46 as in the above embodiment. A water heat exchanger (heat exchanger) 122 configured by the refrigerant tube 22a, the water tube 22b, and the scale processing unit 40 may be included. And the scale process control part (control part) 65 controls the water circulation pump (pump) 132, and adjusts the flow velocity etc. of the water which flows into the water pipe 22b. 6 with the same reference numerals as those in FIG. 1 have the same functions as those in FIG.

  Also in this case, the same effect as the refrigeration apparatus 2 according to the above embodiment can be obtained.

(C)
In the refrigeration apparatus 2 of the above-described embodiment, an example in which the scale removal operation is realized by increasing the flow velocity flowing through the scale processing unit 40 has been described. However, the present invention is not limited to this.

  For example, the scale removal operation may be realized by reversing the flow of water flowing through the scale processing unit 40. Specifically, water heat is caused to flow from the second pipe 45 side arranged downstream of the scale processing unit 40 and from the first pipe 43 side arranged upstream of the scale processing unit 40. The exchanger 22 may be configured. In this case, by controlling the first valve 44 or the second valve 46, it is possible to realize a backflow state in which the water flow in the scale processing unit 40 is opposite to that in the normal operation. Even in this case, a flow different from that during normal operation acts on the scale S attached to the inner wall surface 40a of the scale processing unit 40, and the scale S can be detached from the inner wall surface 40a.

  Furthermore, as described above, in the refrigeration apparatus 2 capable of realizing the scale removal operation in which the inside of the scale processing unit 40 flows backward, as shown in FIGS. 7 (a) and 7 (b), water is contained in the scale processing unit 40. A ring-shaped brush 47 that moves in accordance with the flow and a part of which contacts the inner wall portion 40a of the scale processing unit 40 may be disposed.

  In this case, the brush 47 moves in the direction of the solid arrow shown in FIG. 7 by the flow of water flowing backward during the scale removal operation (the direction of the black arrow shown in FIG. 7). At this time, the scale S adhering to the inner wall surface 40a of the scale processing unit 40 is scraped off by the brush 47 moving in the direction of the solid line arrow as shown in FIG. As a result, it is possible to suppress degradation of the equipment performance that occurs when the scale S adheres to the inner wall surface 40a of the scale processing unit 40.

(D)
In the refrigeration apparatus 2 of the above-described embodiment, an example in which the scale removal operation is realized by increasing the flow velocity flowing through the scale processing unit 40 has been described. However, the present invention is not limited to this.

  For example, the turbulent flow may be generated in the scale processing unit by adjusting the opening degree of the first valve and the second valve. Thereby, a force different from that during normal operation acts on the scale attached to the inner wall surface of the scale, and the scale can be detached from the inner wall surface.

(E)
In the refrigeration apparatus 2 of the above-described embodiment, an example in which both the first valve 44 and the second valve 46 are controlled has been described. However, the present invention is not limited to this.

  For example, only the first valve 44 arranged on the upstream side of the scale processing unit 40 may be controlled. Also in this case, the same effect as the refrigeration apparatus 2 according to the above embodiment can be obtained.

(F)
In the hot water supply device 1 of the above embodiment, the example in which the scale processing unit 40 is set at a position where the water flowing through the water pipe 22b reaches 65 ° C. has been described. However, the present invention is not limited to this.

  The predetermined temperature range varies depending on the quality (hardness and the like) of the water that is circulated through the water pipe, and needs to be set appropriately depending on the quality of the circulated water.

(G)
In the refrigeration apparatus 2 of the above-described embodiment, an example in which the scale removal operation is realized by increasing the flow rate of the water flowing through the scale processing unit has been described. However, the present invention is not limited to this.

  For example, as described above, the scale removal operation may be realized by combining an example in which the flow of water flowing in the scale processing unit is reversed and an example in which the flow is turbulent. Also in this case, the same effect as the refrigeration apparatus 2 according to the above embodiment can be obtained.

(H)
In the refrigeration apparatus 2 of the above embodiment, the first pipe 43 and the second pipe 45 have been described by way of example connected to the hot water storage tank 31. However, the present invention is not limited to this.

  For example, as shown in FIG. 9, a tank 231 different from the hot water storage tank 31 is provided, and the tank 231, the first pipe 243, the second pipe 245, the first valve 244, the second valve 246 and the circulation pump 249 are provided. An independent circulation circuit may be formed. Even in this case, the scale processing control unit 65 can realize the scale processing operation in the scale processing unit 40 by controlling at least one of the first valve 244, the second valve 246, and the circulation pump 249. It becomes possible.

  According to the present invention, it is possible to suppress degradation of equipment performance due to scale deposition, and therefore, it is particularly useful to apply to a hot water supply apparatus that uses water having a scale component.

1 is a water system and refrigerant system circuit diagram of a water heater including a water heat exchanger according to an embodiment of the present invention. Sectional drawing which shows the internal structure of a freezing apparatus. The block diagram of the control apparatus of a freezing apparatus. The structural diagram which shows the internal piping of the water heat exchanger of a freezing apparatus. The enlarged view which shows the principal part in internal piping of the water heat exchanger of FIG. The water system and refrigerant system circuit diagram of the hot water supply apparatus containing the water heat exchanger which concerns on other embodiment of this invention. (A) is the longitudinal cross-sectional view which showed the scale process part of the water heat exchanger which concerns on other embodiment of this invention. (B) is sectional drawing which showed the scale process part of the water heat exchanger which concerns on other embodiment of this invention. The longitudinal cross-sectional view which showed the scale process part of the water heat exchanger which concerns on other embodiment of this invention. The water system and refrigerant system circuit diagram of the hot water supply apparatus containing the water heat exchanger which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply apparatus 2,102 Refrigeration apparatus 2a Machine room 2b Fan room 2c, 2d Heat insulation wall 3 Hot water storage apparatus 4 Control box 5 Control apparatus 6 Microcomputer 7 Inverter 8 Outside temperature sensor 9 Discharge pipe temperature sensor 10 Temperature sensor 20 Refrigeration circuit 21 Compressor 22,122 Water heat exchanger (heat exchanger)
22a Refrigerant pipe 22b Water pipe 22aa Incoming side 22ab Outlet side 23 Expansion valve 24 Air heat exchanger 25 Refrigerant pipe 26 Gas heat exchanger 27 Fan 28 Motor support base 30 Water circulation circuit 31 Hot water tank 32 Water circulation pump 35 Water pipe 40 Scale processing part 40a Inner wall surfaces 43, 243 First piping 44, 244 First valve 45, 245 Second piping 46, 246 Second valve 47 Brush 61 Temperature correction unit 61a First correction unit 61b Second correction unit 62 Target discharge pipe temperature setting unit 63 Expansion valve opening control unit 64 Inverter control unit 65 Scale processing control unit (control unit)
132 Water circulation pump (pump)
231 Tank 221a First refrigerant pipe 222a Second refrigerant pipe 249 Circulation pump S Scale d1 Inner diameter d2 of scale processing section Inner diameter of water pipe

Claims (7)

A refrigeration apparatus (2,102) including a heat exchanger (22,122) for exchanging heat between water and a refrigerant,
A refrigeration apparatus comprising a control unit (65) for performing a scale removal operation for removing scale (S) deposited on a water pipe (22b) through which the water flows in the heat exchanger. In the scale removal operation, at least the water in the water pipe is caused to flow backward to the scale processing unit (40) in which the water is in a predetermined temperature range.
The refrigeration apparatus according to claim 1. A ring-shaped brush (47) that is disposed in the flow path of the scale processing unit, moves with the flow of the water, and partly contacts the inner wall (40a) of the scale processing unit; Yes,
The refrigeration apparatus according to claim 2. In the scale removal operation, the flow rate of the water flowing through the scale processing unit (40) in which at least the water is in a predetermined temperature range in the water pipe is increased,
The refrigeration apparatus according to any one of claims 1 to 3. In the scale removal operation, at least the water in the water pipe has a predetermined temperature range, and the flow of the water flowing through the scale processing unit (40) is turbulent.
The refrigeration apparatus according to any one of claims 1 to 4. The control unit controls a pump (132) for circulating the water through the water pipe in order to perform the scale removal operation.
The refrigeration apparatus according to any one of claims 1 to 5. A first pipe (43, 243) connected to the water pipe on the upstream side of the scale processing unit;
A first valve (44, 244) for opening and closing the flow path of the first pipe;
A second pipe (45, 245) connected to the water pipe on the downstream side of the scale processing unit;
A second valve (44, 246) for opening and closing the flow path of the second pipe;
Further comprising
The control unit controls at least one of the first valve and the second valve to perform the scale removal operation.
The refrigeration apparatus according to any one of claims 2 to 5.

Images