CN1170088C - Air conditioning system for performing multiple heat transfer by using water-liquid-gas two-phase change - Google Patents

Abstract

An air conditioning system for performing multiple heat transfer by using water-liquid-gas two-phase change is characterized in that: the air conditioning system is internally provided with a water circulating system, the water circulating system is arranged in an air inlet duct for introducing outdoor air, a water pipe row is arranged on the outer side of an indoor side heat exchanger, water is used as a heat exchange medium, and the temperature of the inlet air passing through the water pipe row is reduced when cold air circulates; before the indoor air is exhausted outdoors, the indoor air passes through the water-liquid-gas heat exchange device in the exhaust air duct to obtain a cooling effect, so that the heat exhaust effect of the outdoor heat exchanger is greatly improved, the operating efficiency of the heat source system is greatly improved, the energy consumption required by the heat source system is reduced, and the heat pollution of the waste heat exhausted by the heat source system to the atmosphere is effectively reduced; when the heating circulation is performed, the air intake through the tube bank obtains the effect of temperature rise, and the indoor hot air passes through the water-liquid-gas heat exchange device in the exhaust air duct before being exhausted outdoors, so that the effect of temperature rise and humidification is obtained, and the energy consumption required by a heat source system is further reduced.

Description

Air Conditioning System Using Water-Liquid-Gas Two-Phase Change for Multiple Heat Transfer

technical field

The invention relates to an air-conditioning system, in particular to an air-conditioning system which utilizes the two-phase change of water, liquid and gas to perform multiple heat transfer.

Background technique

1. The mechanical or non-mechanical heat source system used in the existing air-conditioning system performs heat transfer to obtain the required comfortable environment, but a huge amount of energy must be input during the heat transfer operation to maintain its operation. According to estimates 40% of the world's energy (electricity) is used to maintain air conditioning or heat transfer operations in industrial processes. The consumption of this huge energy has caused serious damage to the global environment; in addition, the discharge of huge waste heat (sensible heat) in the process of heat transfer is also the culprit of serious thermal pollution in the environment. The demand is more intense, while the operating efficiency of the air-conditioning heat source system is lower and the energy consumption is higher.

2. As shown in Figure 1, it is a schematic diagram of the current air-conditioning system. When the heat source equipment A circulates the cold air, the indoor heat exchanger C absorbs heat in the room, and the outdoor heat exchanger B heats the room. Or called exothermic effect; during the heating cycle, the indoor side heat exchanger C will release heat and increase the temperature of the air conditioning section R, while the outdoor side heat exchanger B will perform heat absorption, and the specific use configuration of this air conditioning system If it is a direct expansion air conditioner, as shown in FIG. 2 , the main heat source equipment A1 is a compressor. Cooperate with an indoor heat exchanger C1, an outdoor heat exchanger B1 and a switching valve D as a cooling and heating switching control to perform cooling or heating circulation; as for the air conditioning system, if it is a central air conditioning system, its specific use The configuration is shown in Figure 3, where the heat source equipment A2 includes a boiler (heat source for heating), a refrigerator (heat source for cooling air), and indoor side heat exchanger C2 is a cooling and heating fan unit, and the outdoor side exhausts heat. Exchanger B2 is a cooling water tower.

However, no matter what kind of implementation, or what kind of heat source system (mechanical such as refrigerant compression system, or non-mechanical such as absorption system), for example, mechanical heat source system is to use alkanes and other refrigerants as heat exchange cycle Medium, which is highly dependent on harmful and environmentally friendly refrigerants to achieve the purpose of heat exchange, does not meet the demands of environmental protection and energy-saving operation; and if the non-mechanical absorption system wants to achieve the goal of heat transfer, it must invest a lot of energy and emit huge amounts of energy. Waste heat also faces the problems of environmental protection and energy consumption.

Contents of the invention

The technical problem to be solved by the present invention is to provide an air-conditioning system that utilizes the two-phase change of water, liquid and gas to carry out multiple heat transfer in view of the lack of existing air-conditioning systems, and an air-conditioning system that meets environmental protection requirements and improves the operation of indoor and outdoor heat exchangers. An air conditioning system that improves efficiency, reduces energy consumption required by the heat source system, and reduces waste heat discharged from the heat source system.

The technical problem proposed by the present invention is achieved by the following technical solutions.

An air-conditioning system that utilizes the two-phase change of water, liquid and gas to carry out multiple heat transfer. This system includes a water circulation system and another heat source system. It is characterized in that it is equipped with a water circulation system. Supplemented by the heat source system, the two are used for compound heat transfer operation, of which:

In the water circulation system, a water pipe row is provided outside the indoor heat exchanger in the air intake duct. The pipe row is provided with a coil pipe, and its water inlet and outlet are respectively connected with the water pump to supply the water tank and the water outlet through the pipeline. The water-liquid-gas heat exchange device is connected; and the water-liquid-gas heat exchange device is located in the exhaust air duct, located inside the outdoor heat exchanger, and is equipped with a filter material that promotes water evaporation to receive the splash of circulating water or flow through, and have a catch pan at the bottom.

In addition to the above-mentioned necessary technical features, the following technical content may also be added during the specific implementation process:

Wherein, a water-liquid-gas heat exchange device is added outside the water pipe row in the air intake duct.

One or more bypass air ducts are set between the air intake air duct and the exhaust air duct.

Wherein the water-liquid-gas heat exchange device is provided with at least one water spray head matched with filter material.

Wherein the water pipe row in the water circulation system and the indoor heat exchanger in the heat source system are respectively placed in different positions of the air intake duct.

A natural convection pipe row is arranged outside the water-liquid-gas heat exchange device in the exhaust air duct, and a closed annular coil is arranged inside the natural convection pipe row, and refrigerant is installed in the annular coil.

Wherein the position of the water pipe row is arranged at an appropriate position on the indoor side other than the air intake duct, and cooperates with a fan motor to directly exchange heat with the indoor air.

Wherein the indoor side heat exchanger is arranged at an appropriate indoor position outside the air intake duct, and cooperates with a fan motor to directly exchange heat with the indoor air.

The advantages of the present invention are:

It can effectively improve the operating efficiency of the heat source system, effectively reduce the energy consumption required for the heat transfer of the air conditioner and reduce the heat pollution caused by its waste heat sensible heat emission.

Hereinafter, the specific embodiments of the present invention are described in detail in conjunction with the accompanying drawings:

Description of drawings

Figure 1 is a schematic diagram of an existing air conditioning system;

Fig. 2 is a schematic diagram of an existing air conditioning system configured in a direct expansion air conditioner system;

Fig. 3 is a schematic diagram of the current air-conditioning system configured in the central air-conditioning system;

Fig. 4 is its system schematic diagram of the present invention;

Fig. 5 is a schematic diagram of the operation relationship of the present invention when cold air is supplied;

Fig. 6 is a schematic diagram of the action relationship of the present invention when heating is supplied;

Fig. 7 is a system schematic diagram of another embodiment 1 of the present invention;

Fig. 8 is a system schematic diagram of another embodiment 2 of the present invention;

Fig. 9 is a schematic diagram of another embodiment 3 system of the present invention;

Fig. 10 is a system schematic diagram of another embodiment 4 of the present invention;

Fig. 11 is a schematic cross-sectional view of its water-liquid-gas heat exchange device of the present invention;

Fig. 12 is a schematic cross-sectional view of another embodiment of the water-liquid-gas heat exchange device of the present invention.

Detailed ways

Please refer to Fig. 4 first, the air-conditioning system 3 of the present invention includes a water circulation system 32 as the main, and another heat source system 31 as the auxiliary heat transfer cycle, composed of a complex heat transfer cycle system, wherein :

The water circulation system 32 uses water as its circulating consumable refrigerant and heat transfer medium, including:

A water pump 321 is the power source for the circulation of the water circulation system;

A water pipe row 322 is located in the air intake duct 34. The water pipe row 322 contains a coil 3221. One end of the coil 3221 receives the input water, and the other end transmits the water passing through the coil 3221 to the water, liquid, gas and heat switching means 323;

A water-liquid-gas heat exchange capacity 323 is located in the exhaust air duct 33 and is a device that can provide two-phase change of water-liquid-gas. The water-liquid-gas heat exchange device 323 accepts the water flowing out from the water pipe row 322, A water collecting tray 324 is provided at the bottom to collect the water after heat transfer through the device, and then return to the replenishing water tank 325;

A replenishment water tank 325 is a water supply source for the replenishment water tank 325 and the water supply circulation system 32 with a water inlet pipe 3251;

The heat source system 31 includes:

A heat source device 311, which accepts externally provided energy, converts it into heat transfer capability, and provides the heat transfer capability required by the heat source system 31;

An indoor heat exchanger 312 receives the heat exchange capacity provided by the heat source device 311 (i.e. supplies indoor air-conditioning or heating), and cooperates with a fan motor 313 to perform heat exchange on the indoor side for heat absorption or heat dissipation;

An outdoor heat exchanger 314 receives the heat exchange capacity provided by the heat source device 311, and cooperates with a fan motor 315 to perform heat exchange on the outdoor side for absorbing or expelling heat;

The air-conditioning system 3 of the multiple cycle formed by the above two cycle systems 31, 32;

1. When cold air is supplied, the outdoor air passes through the water pipe row 322 of the air intake duct 34, because the temperature of the circulating water in the coil pipe 3221 is lower than the temperature of the intake air: due to the heat transfer effect, the air passing through the water pipe row 322 After the air cools down (outside air transfers heat to the water in the pipe row), before passing through the indoor heat exchanger 312, most of the air-conditioning load can be removed to reduce the energy consumption of another heat source device 311 that is matched with it ; and before the cold air on the indoor side is discharged outside, it first passes through the water-liquid-gas heat exchange device 323 in the exhaust air duct, so that the air and water passing through this device are evaporated from the liquid phase to the gas phase due to part of the water, and after obtaining the cooling effect, Let the discharged wet and cold air be used as the heat exchange medium for the outdoor heat exchanger 314 to discharge heat, and use its wet and cold (compared with the temperature and humidity of the outdoor air) heat exchange medium to perform heat exchange, so that the outdoor heat exchanger The heat removal effect of 314 is greatly increased, and the operating efficiency of the heat source system 31 is improved, thereby reducing the energy consumption of the thermal system, and effectively reducing the thermal pollution of the atmosphere caused by the waste heat discharged by the heat source device 311;

2. When the heating is supplied, the temperature of the water in the water circulation system 32 is higher than the temperature of the intake air passing through the water pipe row 322, so that the intake air passing through the water pipe row 322 can obtain the effect of heating up, which can reduce the temperature of the indoor side heat exchanger 312 matched with it. The required heating capacity, and before the hot indoor air is discharged outside, it first passes through the water-liquid-gas heat exchange device 323 in the exhaust air duct 33, so that the water passing through this device can obtain warming air and humidification effect. The discharged hot and humid air is used as the heat exchange medium for the outdoor side to absorb heat. Using its humid heat (compared with the temperature and humidity of the outdoor air), the outdoor side heat exchanger can obtain a large and stable heat source, making it more effective in absorbing heat. It can improve the operation effect of the heat source system and reduce the energy consumption of the heat source equipment 311.

In addition, in order to more clearly illustrate the inventive features of this case, the actuation relationship of the present invention is described in detail with Figures 5 and 6 as follows:

1. When supplying cold air, as shown in Figure 5, the air intake TAO on the outdoor side is a high-temperature air, which is pre-cooled by the water pipe row 322 and then absorbed by the heat exchanger 312 on the indoor side to provide indoor cooling. The side air-conditioning also reduces the load and energy consumption of the indoor heat exchanger 312 due to the pre-cooling of the water pipe row 322; and when the indoor air TI is discharged, the water-liquid-gas evaporation effect of the water-liquid-gas heat exchange device 323, The discharged air TI is cooled to form a wet and cold air, which will help the heat removal efficiency of the outdoor heat exchanger 314, reduce the energy consumption required by the heat source system 31 and thermal pollution to the atmosphere; moreover, from the figure The disclosure can further enable people to understand the interactive relationship between the two circulation systems 31 and 32 for multiple heat transfer;

2. When heating is supplied, as shown in Figure 6, the air intake TAO outside the outdoor is a low-temperature air, which is preheated by the water pipe row 322 and then heated by the heat exchanger 312 on the indoor side, so that it can To provide indoor heating, the load of the indoor heat exchanger 312 and the energy consumption required by the heat source system 31 are also reduced due to the temperature rise of the water pipe row 322; Water, liquid and gas evaporate or condense, so that the exhausted air TI can obtain the effect of cooling and humidifying, which is conducive to the heat absorption effect of the outdoor heat exchanger 314 (compared to directly absorbing heat from the outside air); therefore. The heat absorption efficiency of the outdoor side heat exchanger 314 can be improved, and the energy consumption of the heat source system can be reduced.

As shown in FIG. 7 , it is a system diagram of another embodiment 1 of the present invention, wherein the air conditioning system 4 is the same as that of the embodiment in FIG. Equipment 411, an indoor heat exchanger 412, a fan motor 413, an outdoor heat exchanger 414 and a fan motor 415; as for the water circulation system 42, a water pump 421 is provided, and a water pump 421 is provided in the exhaust air duct 43. The liquid-gas heat exchange device 423 has a water collection tray 424 at the bottom, and a water pipe row 422 is arranged in the air intake duct 44, and a coil pipe 4221 is arranged inside it. The difference from the embodiment in FIG. 4 is that the water pipe row 422 Before adding a water-liquid air-free heat exchange device 425, a water collecting tray 426 is installed at the bottom, and the power of the water pump 421 is used to promote the water circulation in the pipeline, and a water inlet pipe 4271 is used to replenish the water supply tank 427 to provide water for the water circulation 42 source, and with the help of the water-liquid-gas heat exchange device 425, the air intake outside the outdoor is allowed to pass through the water and air of the water-liquid-gas heat exchange device 425 when the cold air is circulated, because part of the water is formed by the liquid phase Evaporate into the gas phase to obtain the cooling effect, and then through the water pipe 422 before the indoor heat exchanger, most of the air-conditioning load can be removed to reduce the energy consumption required by the heat source equipment 411; and when the heating cycle is supplied, The water-liquid-gas heat exchange device 425 enables the outdoor air to obtain a warming and humidifying effect after passing through, and can also reduce the energy consumption of the matching heat source equipment 411 .

Fig. 8 is another embodiment two of the present invention, and this air-conditioning system 5 is identical in the embodiment of Fig. 4, and this system 5 mainly consists of a heat source device 511, an indoor heat exchanger 512, a fan motor 513, a The heat source system 51 composed of the outdoor side heat exchanger 514 and a fan motor 515, and a water pump 521, a supply water tank 525 with a water inlet pipe 5251, a water pipe row 522, a coil pipe 5221 and a water liquid The air heat exchange device 523 has a water circulation system 52 formed by a water collection tray 524 at the bottom, the difference is that one or more bypasses are added between the exhaust air duct 53 and the intake air duct 54 Air ducts 55, 56 Each bypass air duct 55, 56 is provided with a control air inlet damper baffle plate 551, 561 to provide air bypass circulation, so that it is suitable for when the temperature difference between the indoor and the outside is too high (i.e. Ta-TO≥ X, where Ta represents the indoor ambient temperature, TO represents the outdoor ambient temperature, and X represents the set difference), in order to maintain the temperature in the air-conditioning area at a constant condition, the bypass method is used; to control the heat exchange of the entire system amount to form a bypass cycle.

Figure 9 shows another embodiment three of the present invention. This system 6 heat source system 61 consists of a heat source device 611, an outdoor heat exchanger 614, a fan motor 615, an indoor heat exchanger 612, and a fan motor. 613, etc., and the water circulation system 62 is composed of a water pump 621, a supply water tank 625 with a water inlet pipe 6251, a water pipe row 622 with a coil pipe 6221, a water-liquid-gas heat exchange device 623, and a water collecting tank at the bottom Disk 624 etc. are made up, and this embodiment is roughly the same as Fig. 4, and difference, in air intake duct 64, be equipped with water pipe row 622 and a fan motor 65, outdoor air intake TAO passes through water pipe row 622 by fan The motor 65 is directly sent to the indoor side, and the indoor side heat exchanger 612 and a fan motor 613 of another heat source system 61 can be separately installed in appropriate positions according to the needs of the indoor space, that is, the water pipe row 622 and the indoor side heat exchanger 612 Provide heating and cooling in different appropriate spaces.

Figure 10 shows another embodiment four of the present invention, this system 8 heat source system 81 is made up of a heat source device 811, an outdoor heat exchanger 814, a fan motor 815 and an indoor heat exchanger 812, a fan motor 813, etc., and the water circulation system 82 is composed of a water pump 821, a supply water tank 825 with a water inlet pipe 8251, a water pipe row 822 with a coil pipe 8221, a water-liquid-gas heat exchange device 823, and a set at the bottom The water tray 824 is composed of water tray 824, among which an indoor heat exchanger 812 and a fan motor 813 are arranged in the air intake duct 84, and the outdoor air intake TAO provides cold or warm air to the room through the indoor heat exchanger 812 and the fan motor 813. On the side, and in the position of suitable indoor space, be provided with a water pipe row 822, a fan motor 85 additionally, utilize this water pipe row 822 to directly carry out heat exchange with the air of indoor side.

The water-liquid-gas heat exchange device in the above-described embodiments can also be shown in Figure 11, the device 323 is provided with at least one nozzle 3231 to spray mist water vapor on the filter material 3232, and the filter material 3232 is Composed of air-permeable filter nets, when mist-like water vapor is sprayed on the filter material 3232, it changes from liquid water to gaseous water vapor, and the air passes through the filter material 3232 due to water evaporation and filtering effects, causing the air to cool down moderately Or heat up (depending on the water temperature and air temperature), if the water temperature is lower than the wet bulb temperature of the air, the air will cool down; otherwise, it will heat up and purify the effect, while the water collecting tray 324 collects the water flowing out of the filter material, and passes through the drain pipe 3241 Enter the water pump, and the water and air perform heat exchange work in the device 323. When the cold air circulates, the circulating water emits heat into the air through evaporation. While the heating cycle, the circulating water gets heat from the air.

Regarding the function of the water-liquid-gas heat exchange device, it is mainly to use circulating water to spray or flow through the filter material of the water-liquid-gas heat exchange device, so that the circulating water can spread on the largest area in the shortest time, and provide the exhaust air when passing through. , can quickly use the evaporation or condensation of water (that is, the two-phase change of liquid and gas) to perform heat exchange to achieve the effect of cooling (during air-conditioning cycle) or heating (during heating cycle); however, to achieve this two-phase change of water-liquid-gas There are many ways, such as shown in Figure 12, which is also a good implementation. In this embodiment, the compressed air is mainly used to blow out the compressed air through the nozzle 728, and the water in the water tank 725 flows out from the suction pipe 726 due to the compressed rapid drainage, and is sprayed into mist-like water vapor and sprayed on the filter of the water-liquid-gas heat exchange device 723. on the material to provide heat exchange when the exhaust TI passes through the filter material.

In the embodiment shown in Fig. 12, the present invention can install a natural convection pipe row 75 on the outside of the water-liquid-gas heat exchange device 723. This pipe row is a closed annular pipeline, and an appropriate amount of saturated refrigerant is installed inside. When the cold air circulates, the indoor low-temperature air is discharged and passes through the upper part of the tube row 75, absorbing the heat of the gaseous refrigerant in the tube row and causing the refrigerant to condense at the upper end of the natural convection tube row. Due to gravity, it naturally flows along the inner tube The wall drips down, but the lower end of the natural convection tube row is placed at the entrance of fresh outside air. Fresh outside air with high temperature and high humidity passes through this tube row to obtain the effect of pre-cooling, so the natural convection tube row 75 The addition of cold air circulation is very helpful for saving energy consumption; as for the air conditioning system 7 in this embodiment, its heat source circulation system 71 includes heat source equipment 711, indoor and outdoor fan motors 713, 715, indoor and outdoor Heat exchangers 712, 714: and the water pump 721 of the water circulation system 72, the makeup water tank 727 with the water inlet pipe 7271, the water pipe row 722 with the coil pipe 7221, and the exhaust air duct 73, the air intake air duct 74 and other configurations, generally Same as the previous embodiments; the biggest difference between this embodiment and the previous embodiments is that a water level controller 729 and a suction pipe 726 are provided in a water tank 725, and compressed air is ejected from the nozzle 728 to drain the water in the water tank 725. The water flows out from the suction pipe 726 and mixed with the air sprayed from the nozzle 728 to form an atomized water-liquid-gas sprayed on the filter material of the water-liquid-gas heat exchange device 723 to provide indoor air TI for water-liquid-gas heat exchange when it passes through .

To sum up, the present invention utilizes the water two-phase (liquid-gas) changing circulation system and other heat source systems to carry out the double heat transfer cycle, and effectively utilizes the natural refrigerant water to reduce the energy consumption of heat transfer and the pollution of waste heat discharge, so The invention has remarkable practical and progressive benefits.

Claims (8)

1. An air-conditioning system that utilizes the two-phase change of water, liquid and gas to carry out multiple heat transfer. This system includes a water circulation system and another heat source system. The equipment of the heat source system is an air conditioner or a boiler and a refrigerator. It is characterized in that: There is a water circulation system, the operation of the system is mainly based on the water circulation system, and supplemented by the heat source system, using these two to carry out double heat transfer operation, of which: The water circulation system is provided with a water pipe row outside the indoor heat exchanger of the heat source system in the air intake duct. The pipe row is equipped with a coil, and its water inlet and outlet are respectively supplied with water pumps through pipelines. The water tank and the water-liquid-gas heat exchange device are connected; and the water-liquid-gas heat exchange device is located in the exhaust air duct, located inside the heat exchanger outside the heat source system, and is equipped with a breathable filter that promotes water evaporation. The net accepts the spray or flow of circulating water and has a catch pan at the bottom. 2. The air-conditioning system using water-liquid-gas two-phase change for multiple heat transfer according to claim 1, wherein a water-liquid-gas heat exchange device is added outside the water pipe row in the air intake duct. 3. The air-conditioning system for multiple heat transfer using water-liquid-gas two-phase change according to claim 1, wherein one or more bypasses are set between the air intake duct and the exhaust duct air duct. 4. The air-conditioning system for multiple heat transfer using water-liquid-gas two-phase change according to claim 1, characterized in that: the water-liquid-gas heat exchange device is equipped with at least one water spray head in the device to cooperate with ventilation sexual filter. 5. The air-conditioning system for multiple heat transfer using water-liquid-gas two-phase change according to claim 1, wherein the water pipe row in the water circulation system and the indoor side heat exchanger in the heat source system are placed separately in different positions of the air intake duct. 6. The air-conditioning system for multiple heat transfer using water-liquid-gas two-phase change according to claim 1, wherein a natural convection pipe row is arranged outside the water-liquid-gas heat exchange device in the exhaust air duct , the natural convection pipe row is provided with a closed annular coil, and the annular coil is filled with refrigerant. 7. The air-conditioning system for multiple heat transfer using water-liquid-gas two-phase change according to claim 1, wherein the position of the water pipe row is set at an appropriate position on the indoor side other than the air intake duct, and Cooperate with a fan motor to directly exchange heat with the indoor air. 8. The air-conditioning system that utilizes the two-phase change of water, liquid and gas for multiple heat transfer according to claim 1, wherein the indoor heat exchanger is located at an appropriate indoor position other than the air intake duct, and cooperates with A fan motor that directly exchanges heat with the indoor air.

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