TWI772765B - Heat exchange system - Google Patents

Abstract

The application provides a heat exchange system that includes a cooling heat exchange unit configured to receive intake air and cool and dehumidify the intake air, a heating heat exchange unit located downstream of the cooling heat exchange unit and configured to heat the air output from the cooling heat exchange unit, and a water-to-water heat exchange unit. The water-to-water heat exchange unit is connected with the cooling heat exchange unit and the heating heat exchange unit and configured to receive aqueous solutions output from the cooling heat exchange unit and the heating heat exchange unit, cool the aqueous solution output from the cooling heat exchange unit and supply the aqueous solution having been cooled to the cooling heat exchange unit, and heat the aqueous solution output from the heating heat exchange unit and supply the aqueous solution having been heated to the heating heat exchange unit.

Description

heat exchange system

The invention relates to the technical field of air conditioners, and in particular, to a heat exchange system.

The heat exchange system can be used for air conditioning. In a space that needs air conditioning, it can heat up the space by releasing heat to achieve the purpose of heating, or absorb heat to cool the space to achieve the purpose of cooling. However, some existing air conditioners use electric heaters to heat the air to a certain temperature, and then output the air to the space where the temperature needs to be adjusted to adjust the space temperature. Electric heaters consume more power and air conditioners are less energy efficient. In addition, the heat exchange medium of some air conditioners is freon and other medium that will cause harm to users, and the safety is not high.

The present application provides an improved heat exchange system, which can solve the problems of low energy efficiency and low safety of some existing air conditioners.

One aspect of the present application provides a heat exchange system, which includes: a cooling heat exchange unit for receiving intake air, and for cooling and dehumidifying the intake air; a heating heat exchange unit located downstream of the cooling heat exchange unit , for the refrigeration and heat exchange unit The output air is heated; and a water-water heat exchange unit is connected to the refrigeration heat exchange unit and the heating heat exchange unit, and is used for receiving the output of the refrigeration heat exchange unit and the heating heat exchange unit. The aqueous solution is provided to the refrigeration and heat exchange unit after cooling the aqueous solution output by the refrigeration and heat exchange unit, and provided to the heating and heat exchange unit after heating the aqueous solution output by the heating and heat exchange unit.

The heat exchange system of some embodiments of the present application uses the heating and heat exchange unit to heat the air, with low energy consumption and less waste, and the water-water heat exchange unit produces cold water for the cooling and heat exchange unit, and produces hot water for the heating exchange unit Heat unit, so that the refrigeration heat exchange unit and the heating heat exchange unit can use the aqueous solution as the heat exchange medium for heat exchange, which can avoid the refrigerant leakage into Danger in the space to be air-conditioned.

10: Space

20: Chilled Water Manufacturing System

21: Chillers

22: Cooling Tower

23: Chilled water pump

24: Cooling water pump

100, 200, 300, 400: heat exchange system

101, 201: Refrigeration heat exchanger

102: Electric heater

150: Chilled water flow control valve

202: Heating heat exchanger

203: Subcooling Heat Exchanger

204, 314, 414: Compressor

251: Valve

252: Three-way valve

253: Condenser

301: First refrigeration heat exchanger

302, 402: Heating and heat exchange unit

303: Second refrigeration heat exchanger

304: Third heat exchanger

305: Refrigeration heat exchange unit

306, 406: water-water heat exchange unit

310, 410: The first heat exchanger

311, 411: Second heat exchanger

312: First water pump

313: Second water pump

315: Third flow control device

317, 334, 337, 338: Exit

318, 335, 336, 344: Entrance

320: Air Chamber

330: First Entrance

331: First Exit

332: Second Entrance

333: Second Exit

339, 345: Pipeline

340: First flow control device

341, 441: main controller

342, 442: the first temperature sensor

343: Second flow control device

350: Chilled water flow control valve

355: Relative Humidity Sensor

356: Second temperature sensor

360, 460: Auxiliary Controller

Figure 1 shows a schematic diagram of a heat exchange system.

Figure 2 shows a schematic diagram of another heat exchange system.

FIG. 3 is a schematic diagram of an embodiment of the heat exchange system of the present application.

FIG. 4 is a schematic diagram of another embodiment of the heat exchange system of the present application.

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the The same numbers indicate the same or similar elements. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as recited in the appended claims.

The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, technical or scientific terms used in this application shall have the ordinary meaning as understood by those of ordinary skill in the art to which this invention belongs. The terms "first," "second," and similar terms used in the specification and claims of this application do not denote any order, quantity, or importance, but are only used to distinguish different components. Likewise, words like "a" or "an" do not denote a quantitative limitation, but rather denote the presence of at least one. Unless stated otherwise, words like "including" or "comprising" mean that the elements or things appearing before "including" or "including" encompass the elements or things listed after "including" or "including" and their equivalents, and Other elements or objects are not excluded. Words like "connected" or "connected" are not limited to physical or mechanical connections and may include electrical connections, whether direct or indirect.

As used in this specification and the appended claims, the singular forms "a," "said," and "the" can include the singular and plural forms unless the context clearly dictates otherwise. It will also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

The heat exchange system of some embodiments of the present application includes a cooling heat exchange unit, a heating Heat exchange unit and water-to-water heat exchange unit. The cooling and heat exchange unit is used to receive the intake air, and cool and dehumidify the intake air. The heating and heat exchanging unit is located downstream of the cooling and heat exchanging unit, and is used for heating the air output by the cooling and heat exchanging unit. The water-water heat exchange unit is connected to the cooling heat exchange unit and the heating heat exchange unit, and is used to receive the aqueous solution output by the cooling heat exchange unit and the heating heat exchange unit, and provide the cooling heat exchange unit after cooling the aqueous solution output by the cooling heat exchange unit. , and the aqueous solution output by the heating and heat exchange unit is heated and then supplied to the heating and heat exchange unit.

The heating and heat exchange unit is used to heat the air, with low energy consumption and less waste, and the water-water heat exchange unit produces cold water for the cooling heat exchange unit, and produces hot water for the heating heat exchange unit, so that the cooling heat exchange unit and the heating heat exchange unit are produced. The heat exchange unit can use an aqueous solution as a heat exchange medium for heat exchange, which can avoid the danger of the refrigerant leaking into the area to be air-conditioned when the refrigeration heat exchange unit and the heating heat exchange unit use refrigerants such as Freon for heat exchange. .

FIG. 1 is a schematic diagram of a heat exchange system 100 . The heat exchange system 100 may be used to control the temperature and relative humidity of the space 10 to be air-conditioned. The space 10 to be air-conditioned may include an operating room. In some applications, the heat exchange system 100 can control the operating room environment to a dry bulb temperature of 18°C and a relative humidity of 40% to 60%, or a dry bulb temperature of 25°C and a relative humidity of 40% to 60%, but Not limited to this. In some other embodiments, the space 10 may not be limited to an operating room, but may be other spaces, such as laboratories, factories, museums, greenhouses, etc., any space that requires good temperature and humidity control.

The heat exchange system 100 includes a refrigeration heat exchanger 101 and a refrigeration heat exchanger 101 Downstream electric heater 102 . The refrigeration heat exchanger 101 is used to receive the intake air and cool the intake air. The refrigeration heat exchanger 101 may be connected to the chilled water production system 20 . Chilled water production system 20 may include chiller 21 and cooling tower 22 . The refrigerating heat exchanger 101 is connected to the evaporator of the chiller 21 , and a chilled water pump 23 is provided between the refrigerating heat exchanger 101 and the evaporator of the chiller 21 to form a chilled water circuit. The condenser of the chiller 21 is connected to the cooling tower 22, and a cooling water pump 24 is provided between the condenser of the chiller 21 and the cooling tower 22 to form a cooling water circuit. The chilled water manufacturing system 20 refrigerates the aqueous solution output by the refrigerating heat exchanger 101, outputs chilled water to the refrigerating heat exchanger 101, and the chilled water exchanges heat with the intake air in the refrigerating heat exchanger 101, refrigerates the intake air, and can Dehumidify the incoming air. Chilled water is controlled by the chilled water flow control valve 150 to be supplied to the refrigeration heat exchanger 101 for cooling the air to achieve a desired dew point temperature, similar to the process of condensation, to remove moisture from the air. The chilled water flow control valve 150 is controlled by detecting the relative humidity of the space 10 . In some embodiments, the refrigeration heat exchanger 101 may be a cooling coil.

The cooled and saturated air output by the refrigeration heat exchanger 101 is subcooled, and the electric heater 102 is used to heat the air output by the refrigeration heat exchanger 101 to the desired air temperature and reduce the relative humidity to meet the room sensible cooling load ( full or partial load). Thus the dry bulb temperature and relative humidity of the space 10 are well controlled. The electric heater 102 consumes a lot of electricity and has a low COP (Coefficient of Performance) of 1.0. The chilled water production system 20 requires a large amount of energy and wastes a large amount of energy. By artificially introducing thermal loads into the space 10, the electric heater 102 wastes electrical energy, and thus the chilled water production system 20 consumes additional energy.

FIG. 2 is a schematic diagram of another heat exchange system 200 . The heat exchange system 200 includes a refrigeration heat exchanger 201 , similar to the refrigeration heat exchanger 101 shown in FIG. 1 , connected to the chilled water production system 20 . The heat exchange system 200 includes a subcooling heat exchanger 203 and a heating heat exchanger 202 . The heat exchange system 200 is a direct expansion refrigeration system, the subcooling heat exchanger 203 is a direct expansion evaporating coil, and the heating heat exchanger 202 is a direct expansion condensing coil. The subcooling heat exchanger 203 is located downstream of the cooling heat exchanger 201 , and the heating heat exchanger 202 is located downstream of the subcooling heat exchanger 203 . The subcooling heat exchanger 203 and the heating heat exchanger 202 are connected, and a compressor 204 is connected between the subcooling heat exchanger 203 and the heating heat exchanger 202 . The refrigerant is circulated in the subcooling heat exchanger 203 and the heating heat exchanger 202 by the compressor 204 . In some embodiments, compressor 204 may be a fixed speed compressor or a variable speed compressor. The heat exchange system 200 includes a condenser 253 connected between the compressor 204 and the subcooling heat exchanger 203 through a valve 251 and a three-way valve 252 . The three-way valve 252 is connected to the heating heat exchanger 202 . The condenser 253 is used to regulate heat between the subcooling heat exchanger 203 and the heating heat exchanger 202 . In some embodiments, condenser 253 may be an air-cooled condenser.

The cooling heat exchanger 201 refrigerates and dehumidifies the intake air, the recooling heat exchanger 203 further refrigerates and dehumidifies the air output by the cooling heat exchanger 201, and the heating heat exchanger 202 further cools and dehumidifies the output air from the recooling heat exchanger 203. The air is heated to achieve the desired dry bulb temperature of the space 10 to be air-conditioned. The relative humidity of the space 10 is also well controlled in the process because the heating heat exchanger 202 with the lower evaporating temperature is able to cool the air to a low dew point temperature.

The compressor 204 of the heat exchange system 200 shown in FIG. 2 requires power to transfer heat from the subcooling heat exchanger 203 to the heating exchange as the compressor 204 compresses Heater 202 . Since most of the heat of the direct expansion condensing coil is transferred from the direct expansion steaming coil, the power consumed by the compressor 204 is only a fraction of the power consumed by the electric heater 102 shown in FIG. 1 . In the same process, the heat exchange system 200 provides secondary cooling through the subcooling heat exchanger 203, thus saving the additional energy required by the chilled water production system 20 of Figure 1 . Under the same conditions (inlet air of the same temperature and humidity, and output air of the same temperature and humidity to the space 10), in an example, the power required by the compressor 204 is 6kW, and the power required by the electric heater 102 is 31kW, Significant power savings. Considering the use of different technologies and products, if 100% of the heat generated is used for the above process, the COP of the heat exchange system 200 is in the range of 2-5 COP. The heat exchange system 200 adopts the cooling priority mode as its main control logic, and the excess heat generated and unused by the heating heat exchanger 202 is released to the air-cooled finned condenser (part of the heat exchange system 200), and finally discharged to the in the atmosphere.

In addition, under the same conditions, compared with the refrigerating heat exchanger 101 shown in FIG. 1 , the temperature of the air output after cooling by the refrigerating heat exchanger 201 shown in FIG. Therefore, compared with the chilled water production system 20 shown in FIG. 1 , the chilled water production system 20 shown in FIG. 2 requires less energy and releases less heat, thus saving energy waste. Under the same conditions, in an example, the chilled water production system 20 shown in FIG. 1 inputs a cooling capacity of 50RT, outputs a heat of 62RT, and requires 50kW of energy, while the chilled water production system 20 shown in FIG. The cooling capacity, the heat output of 55RT, only needs 43kW of energy. The chilled water manufacturing system 20 in FIG. 2 requires little energy and wastes little energy.

However, the system shown in Figure 2 has inherent risks. Since the refrigerant is the main The required heat transfer medium circulates between the subcooling heat exchanger 203 and the heating heat exchanger 202 in the air flow provided to the space 10 requiring air conditioning, any leakage of these heat exchangers may carry the entire refrigerant to space 10, such as a small confined space like a medical operating room. The direct expansion refrigeration system 200 typically uses a high pressure refrigerant gas, such as Freon, to evaporate at room temperature. The gas used in this system is essentially odorless and heavier than air. When leaking indoors through pipes and diffusers, there is a risk of unknowingly suffocating indoors.

FIG. 3 is a schematic diagram of an embodiment of the heat exchange system 300 of the present application. The heat exchange system 300 includes a cooling heat exchange unit 305 , a heating heat exchange unit 302 and a water-water heat exchange unit 306 . The cooling and heat exchange unit 305 is used for receiving the intake air, and cooling and dehumidifying the intake air. The heating and heat exchanging unit 302 is located downstream of the cooling and heat exchanging unit 305 , and is used for heating the air output by the cooling and heat exchanging unit 305 . The water-water heat exchange unit 306 is connected to the cooling heat exchange unit 305 and the heating heat exchange unit 302, and is used for receiving the aqueous solution output by the cooling heat exchange unit 305 and the heating heat exchange unit 302, and after cooling the aqueous solution output by the cooling heat exchange unit 305 It is provided to the cooling and heat exchange unit 305 , and the aqueous solution output by the heating and heat exchange unit 302 is heated and then provided to the heating and heat exchange unit 302 . The water-to-water heat exchange unit 306 includes a water-to-water heat exchanger.

The heating and heat exchange unit 302 is used to heat the air, with low energy consumption and less waste, and the water-water heat exchange unit 306 produces cold water for the cooling and heat exchange unit 305, and produces hot water for the heating and heat exchange unit 302, so that cooling The heat exchange unit 305 and the heating heat exchange unit 302 can use an aqueous solution as a heat exchange medium for heat exchange, which can prevent the cooling heat exchange unit 305 and the heating heat exchange unit 302 from using a refrigerant such as Freon to exchange heat. During replacement, the refrigerant leaks into the space 10 to cause danger. In some embodiments, the aqueous solution includes saline and the like. Even if the aqueous solution leaks, it will not bring any danger to the personnel in the space 10, and the safety is high.

In some embodiments, the refrigeration heat exchange unit 305 may be connected to the chilled water production system 20 . The chilled water production system 20 is similar to the chilled water production system 20 shown in FIGS. 1 and 2 and will not be described in detail here. In some embodiments, the refrigeration heat exchange unit 305 includes a first refrigeration heat exchanger 301 and a second refrigeration heat exchanger 303 disposed downstream of the first refrigeration heat exchanger 301 . The first refrigeration heat exchanger 301 is used for connecting with the chilled water production system 20 , and the heating and heat exchange unit 302 is located downstream of the second refrigeration heat exchanger 303 . The first refrigerating heat exchanger 301 is similar to the refrigerating heat exchanger 201 shown in FIG. 2 , and refrigerates and dehumidifies the intake air. The first refrigeration heat exchanger 301 is connected to the chilled water production system 20 to form a heat exchange circuit, and a heat exchange medium (eg, an aqueous solution) circulates in the first refrigeration heat exchanger 301 and the chilled water production system 20 . The second refrigerating heat exchanger 303 further refrigerates and dehumidifies the air output from the first refrigerating heat exchanger 301 . In some embodiments, the first refrigeration heat exchanger 301 may include finned cooling coils, and the second refrigeration heat exchanger 303 may include finned cooling coils. The heating and exchanging unit 302 includes finned heating coils. In other embodiments, the second refrigeration heat exchanger 303 may be located upstream of the first refrigeration heat exchanger 301, depending on whether the chilled water from the chilled water production system 20 is cold enough to reach the desired dew point temperature to maintain The relative humidity of the space 10 reaches the desired relative humidity.

In some embodiments, the heating and heat exchanging unit 302 reheats the cold air output by the second cooling heat exchanger 303 to reduce the relative humidity, so that the air is sent to the air conditioning system. The temperature and humidity of the air output in the space 10 meet requirements. In one embodiment, the heating heat exchange unit 302 may include a heating heat exchanger, and the heating heat exchanger may include a coil.

In some embodiments, the water-water heat exchange unit 306 , the cooling heat exchange unit 305 , and the heating heat exchange unit 302 form a heat exchange circuit, and the water-water heat exchange unit 306 makes the connection between the cooling heat exchange unit 305 and the heating heat exchange unit 302 The heat can be exchanged, so that the cooling and heat exchange unit 305 can realize cooling of the air, and the heating and heat exchange unit 302 can realize heating of the air. The water-water heat exchange unit 306 receives the hot water output by the refrigeration and heat exchange unit 305, and after cooling, provides cold water to the refrigeration and heat exchange unit 305, and the cold water flows in the refrigeration and heat exchange unit 305, exchanges heat with the air, and realizes the cooling of the air. . The water-water heat exchange unit 306 receives the cold water output by the heating and heat exchanging unit 302, and after heating, provides hot water to the heating and heat exchanging unit 302, and the hot water flows in the heating and heat exchanging unit 302 to exchange heat with the air, To achieve heating of the air.

In some embodiments, the water-water heat exchange unit 306 is connected between the second refrigeration heat exchanger 303 and the heating heat exchange unit 302 to form a heat exchange circuit. The water-water heat exchange unit 306 enables heat exchange between the second refrigeration heat exchanger 303 and the heating heat exchange unit 302 . The water-water heat exchange unit 306 receives the hot water output by the second refrigerating heat exchanger 303, and after cooling the aqueous solution, provides cold water to the second refrigerating heat exchanger 303, and the cold water flows in the second refrigerating heat exchanger 303 to mix with the air. Heat exchange to achieve cooling of air.

In the water-water heat exchange unit 306, heat exchange between the received hot water of the cooling and heat exchange unit 305 and the received cold water of the heating and heat exchange unit 302 is realized by using a heat exchange medium, so that cold water is produced for the cooling and heat exchange unit 305. Hot water for heating and heat exchange unit 302. In some embodiments, the water-to-water heat exchange unit 306 includes a first heat exchanger 310 and a second heat exchanger 311 . The first heat exchanger 310 is connected to the refrigeration heat exchange unit 305 for receiving the aqueous solution output by the refrigeration heat exchange unit 305 , and provides the aqueous solution output from the refrigeration heat exchange unit 305 to the refrigeration heat exchange unit 305 after cooling. In some embodiments, the first heat exchanger 310 is connected to the second refrigeration heat exchanger 303 , receives hot water output by the second refrigeration heat exchanger 303 , and generates cold water for the second refrigeration heat exchanger 303 .

In some embodiments, a first water pump 312 is connected between the first heat exchanger 310 and the refrigeration heat exchange unit 305 , so that the aqueous solution flows in the first heat exchanger 310 and the refrigeration heat exchange unit 305 . In one embodiment, the first water pump 312 is located between the outlet 317 of the second refrigeration heat exchanger 303 and the inlet 318 of the first heat exchanger 310, and pumps the aqueous solution output from the second refrigeration heat exchanger 303 into the first heat exchanger Heater 310.

The second heat exchanger 311 is connected to the first heat exchanger 310 and is connected to the heating and heat exchange unit 302 for receiving the aqueous solution output from the heating and heat exchange unit 302, and for producing the aqueous solution output from the heating and heat exchange unit 302. The heat is supplied to the heating and heat exchange unit 302 . The second heat exchanger 311 receives the cold water output from the heating and heat exchanging unit 302 to generate hot water for the heating and heat exchanging unit 302 .

In some embodiments, a second water pump 313 is connected between the second heat exchanger 311 and the heating and heat exchange unit 302 , so that the aqueous solution flows in the second heat exchanger 311 and the heating and heat exchange unit 302 . In one embodiment, the second water pump 313 is located between the outlet 337 of the heating and heat exchange unit 302 and the inlet 335 of the second heat exchanger 311, and pumps the aqueous solution output from the heating and heat exchange unit 302 into the second heat exchanger 311.

A heat exchange circuit is formed between the second heat exchanger 311 and the first heat exchanger 310 . A heat exchange medium, such as a refrigerant such as Freon, flows between the second heat exchanger 311 and the first heat exchanger 310 . The heat exchange medium exchanges heat with the aqueous solution in the first heat exchanger 310, so that the first heat exchanger 310 outputs cold water. The heat exchange medium exchanges heat with the aqueous solution in the second heat exchanger 311, so that the second heat exchanger 311 outputs hot water.

In some embodiments, a compressor 314 is connected between the first heat exchanger 310 and the second heat exchanger 311 . Compressor 314 is used to elevate low pressure gas to high pressure gas. In this embodiment, the compressor 314 sucks in a low-pressure gaseous heat exchange medium, and lifts the low-pressure heat exchange medium into a high-pressure gaseous heat exchange medium for output. The heat exchange medium includes gaseous, liquid or gas-liquid mixed state.

In some embodiments, the first heat exchanger 310 includes an evaporator and the second heat exchanger 311 includes a condenser. The second heat exchanger 311 can receive the gaseous heat exchange medium output by the compressor 314, and through the heat exchange between the heat exchange medium and cold water with a lower temperature than the heat exchange medium, the temperature of the cold water is increased to generate and output hot water. The gaseous heat exchange medium exchanges heat with cold water in the second heat exchanger 311 , and condenses to form a liquid heat exchange medium, which is output from the second heat exchanger 311 to the first heat exchanger 310 .

The first heat exchanger 310 receives a heat exchange medium in a liquid state or a gas-liquid mixed state, and the heat exchange medium exchanges heat with hot water with a higher temperature than the heat exchange medium, reduces the temperature of the hot water, and generates and outputs cold water. The heat exchange medium in liquid or gas-liquid mixed state is vaporized in the first heat exchanger 310 to form a gaseous heat exchange medium, and the gaseous heat exchange medium is output from the first heat exchanger 310 to the compressor 314 . Further, the compressor 314 outputs a high-pressure gaseous heat exchange medium to the second heat exchanger 311, and thus circulates heat exchange.

In some embodiments, between the first heat exchanger 310 and the second heat exchanger 311 A third flow control device 315 is connected between them, which can adjust the flow of the heat exchange medium flowing in the first heat exchanger 310 and the second heat exchanger 311 . In some embodiments, the third flow control device 315 includes a throttle valve. When the throttle valve is throttled and depressurized, the liquid heat exchange medium passes through the throttle valve, and the heat exchange medium in the gas-liquid mixed state is output. In some embodiments, the liquid heat exchange medium output from the second heat exchanger 311 passes through a throttle valve to generate a gas-liquid mixed state heat exchange medium for the first heat exchanger 310 .

In some embodiments, the heat exchange system 300 includes a plenum 320 within which the cooling heat exchange unit 305 and the heating heat exchange unit 302 are located. The water-water heat exchange unit 306 is isolated from the cooling heat-exchange unit 305, and is isolated from the heating heat-exchange unit 302, and is isolated from the heat-exchanged and dehumidified air. Therefore, if the heat-exchange medium in the water-water heat-exchange unit 306 leaks, It will not enter the air chamber 320 and thus will not enter the space 10 to avoid danger.

In some embodiments, the cooling heat exchange unit 305, the heating heat exchange unit 302 and the air chamber 320 are assembled into one device, the water-water heat exchange unit 306 may be provided in another independent device, and the two devices may be connected. In other embodiments, the cooling heat exchange unit 305 , the heating heat exchange unit 302 , the air chamber 320 and the water-water heat exchange unit 306 may be assembled into a device, and inside the device, the water-water heat exchange unit 306 is located in the air chamber Outside 320, it is isolated from the cooling heat exchange unit 305 and the heating heat exchange unit 302.

In some embodiments, the compressor 314 includes a fixed-speed compressor with a constant rotational speed, so that the heat exchange system 300 does not need to control and adjust the rotational speed of the fixed-speed compressor, and the control of the system is simple. In some embodiments, the heat exchange system 300 includes a third heat exchanger 304, and the third heat exchanger 304 is connected to the second heat exchanger 311 to exchange heat for heating Between the units 302 and connected to the chilled water production system 20, it is used to receive part of the aqueous solution output by the second heat exchanger 311, use the chilled water output from the chilled water production system 20 to refrigerate the part of the aqueous solution, and return it to the second heat exchange device 311. In some embodiments, the third heat exchanger 304 can refrigerate part of the hot water output by the second heat exchanger 311 and return it to the second heat exchanger 311 to make the temperature of the hot water output by the second heat exchanger 311 The demand of the heating and heat exchange unit 302 can be reached.

The third heat exchanger 304 includes a first inlet 330 , a first outlet 331 , a second inlet 332 and a second outlet 333 . The first inlet 330 of the third heat exchanger 304 is connected to the outlet 334 of the second heat exchanger 311 , and the first outlet 331 of the third heat exchanger 304 is connected to the inlet 335 of the second heat exchanger 311 . The first inlet 330 of the third heat exchanger 304 is connected between the outlet 334 of the second heat exchanger 311 and the inlet 336 of the heating and heat exchange unit 302, and part of the aqueous solution output from the second heat exchanger 311 is input to the heating and heat exchange unit 302 , part of the input to the third heat exchanger 304 . The first outlet 331 of the third heat exchanger 304 is connected between the outlet 337 of the heating heat exchange unit 302 and the inlet 335 of the second heat exchanger 311 . In some embodiments, the first outlet 331 of the third heat exchanger 304 is connected to the inlet 335 of the second heat exchanger 311 through the second water pump 313 , and the second water pump 313 pumps the hot water output by the third heat exchanger 304 into inside the second heat exchanger 311 .

In some embodiments, the third heat exchanger 304 is connected to the pipeline connecting the first refrigeration heat exchanger 301 to the chilled water production system 20 . The second inlet 332 of the third heat exchanger 304 is connected to the pipeline 345 connecting the inlet 344 of the first refrigeration heat exchanger 301 to the chilled water production system 20 . The second outlet 333 of the third heat exchanger 304 is connected to the pipeline connecting the outlet 338 of the first refrigeration heat exchanger 301 and the chilled water production system 20 339 on. The chilled water output from the chilled water production system 20 flows into the third heat exchanger 304, and exchanges heat with the aqueous solution flowing into the third heat exchanger 304 from the second heat exchanger 311 in the third heat exchanger 304. The aqueous solution in the heat exchanger 304 is refrigerated, and the refrigerated aqueous solution is returned to the second heat exchanger 311 . The chilled water output from the chilled water production system 20 is heated in the third heat exchanger 304 and then flows back to the chilled water production system 20 .

In some embodiments, the third heat exchanger 304 includes a water-water heat exchanger, which can avoid the danger of refrigerant leakage and has high safety. In some embodiments, the third heat exchanger 304 comprises a plate heat exchanger.

In some embodiments, a first flow control device 340 is provided on the pipeline connecting the third heat exchanger 304 and the second heat exchanger 311 . Heat exchange system 300 includes at least one controller. At least one controller includes the main controller 341 . The main controller 341 may be provided outside the water-water heat exchange unit 306 . The heat exchange system 300 includes a first temperature sensor 342 located in the space 10 for detecting the temperature of the space 10 . The main controller 341 is connected to the first temperature sensor 342 and the first flow control device 340 for controlling the first flow control device 340 according to the temperature detected by the first temperature sensor 342 to adjust the aqueous solution output by the second heat exchanger 311 The flow into the third heat exchanger 304 enables the hot water output from the second heat exchanger 311 to the heating and heat exchange unit 302 to enable the heating and heat exchange unit 302 to heat the air to a desired temperature, that is, to make the outlet air temperature reach desired temperature. The first temperature sensor 342 may detect the dry bulb temperature within the space 10 .

In some embodiments, the first flow control device 340 is connected to the pipeline output from the third heat exchanger 304 to the second heat exchanger 311 , and the heating and heat exchange unit 302 output to the pipeline of the second heat exchanger 311 . In some embodiments, the first flow control device 340 may include a three-way valve connecting the first outlet 331 of the third heat exchanger 304 , the inlet 335 of the second heat exchanger 311 and the outlet 337 of the heating and heat exchange unit 302 . In other embodiments, the first flow control device 340 may be connected to the pipeline output from the second heat exchanger 311 to the third heat exchanger 304 , and the output of the second heat exchanger 311 to the heating heat exchange unit 302 on the pipeline.

In some embodiments, the pipeline connecting the third heat exchanger 304 and the chilled water production system 20 is provided with a second flow control device 343, and the main controller 341 is connected to the second flow control device 343 for controlling the second flow The control device 343 is used to adjust the flow rate of the chilled water output from the chilled water production system 20 flowing into the third heat exchanger 304 . The main controller 341 can control the second flow control device 343 according to the temperature detected by the first temperature sensor 342 . The main controller 341 may control the first flow control device 340 and the second flow control device 343 according to the temperature detected by the first temperature sensor 342 until the temperature detected by the first temperature sensor 342 reaches a desired temperature. In some embodiments, the second flow control device 343 is connected between the second outlet 333 of the third heat exchanger 304 and the chilled water production system 20 . In other embodiments, the second flow control device 343 is connected between the second inlet 332 of the third heat exchanger 304 and the chilled water production system 20 . In some embodiments, the second flow control device 343 includes a two-way valve.

In some embodiments, heat exchange system 300 includes a relative humidity sensor 355 located within space 10 for detecting relative humidity. The main controller 341 is connected to the relative humidity sensor 355 . In some embodiments, heat exchange system 300 includes a second The temperature sensor 356 is located downstream of the refrigeration and heat exchange unit 305 for detecting the temperature of the air flowing out of the refrigeration and heat exchange unit 305 . In some embodiments, the second temperature sensor 356 is located downstream of the second refrigeration heat exchanger 303 and detects the temperature of the air flowing from the second refrigeration heat exchanger 303 . In some embodiments, the second temperature sensor 356 may be an average temperature sensor for detecting the temperature of the air flowing from the second refrigeration heat exchanger 303 . The chilled water flow control valve 350 , similar to the chilled water flow control valve 150 shown in FIG. 1 , connects the refrigeration heat exchange unit 305 to the chilled water production system 20 . In some embodiments, the chilled water flow control valve 350 connects the first refrigeration heat exchanger 301 to the chilled water production system 20 . The main controller 341 is connected to the second temperature sensor 356 and the chilled water flow control valve 350 for controlling the chilled water flow control valve 350 according to the temperature detected by the second temperature sensor 356 until the temperature detected by the second temperature sensor 356 The desired temperature is reached, and thus the temperature of the space 10 is controlled to reach the desired temperature, and the relative humidity of the space 10 is controlled to reach the desired relative humidity.

In some embodiments, the at least one controller includes an auxiliary controller 360 located within the water-to-water heat exchange unit 306 , and the auxiliary controller 360 may be connected to the main controller 341 . The auxiliary controller 360 may be connected with the main controller 341 . In some embodiments, the auxiliary controller 360 is connected to the compressor 314 , the first water pump 312 and the second water pump 313 , and controls the compressor 314 , the first water pump 312 and the second water pump 313 .

In some embodiments, the third heat exchanger 304 is arranged in the air chamber 320, which can make full use of the space of the air chamber 320, so that the system structure is compact, and the water flowing in the third heat exchanger 304 is not caused by leakage. emit danger. In other embodiments, since the third heat exchanger 304 does not exchange heat with air, the third heat exchanger 304 It can be arranged outside the air chamber 320 . In some embodiments, the third heat exchanger 304 may be provided outside the air chamber 320 and the water-water heat exchange unit 306 . In other embodiments, the third heat exchanger 304 and the water-water heat exchange unit 306 may be provided in the same equipment. In some embodiments, the first flow control device 340 and the second flow control device 343 may be disposed inside the air chamber 320 or outside the air chamber 320 .

In some embodiments, a glycol solution may be used in the evaporator water loop to prevent freezing of the chilled water in the water to water heat exchange unit 306 .

In some embodiments, the water-to-water heat exchange unit 306 may include a separate water source direct expansion heat pump, may be one heat pump dedicated to each air handler, or a combination of multiple heat pumps may be used for one air handler, or one heat pump may be used for multiple heat pumps. An air handler that performs functions like humidity control. The air handler is the heat exchange system 300 . Each heat pump includes one or more first heat exchangers 310 which may be refrigerant-water evaporators, one or more second heat exchangers 311 which may be refrigerant-water condensers, one or more fixed rotational speed Or a variable speed compressor 314 and a third flow control device 315, which may be a direct expansion valve, uses a refrigerant medium to implement an evaporative-compression refrigeration cycle. Compared to the use of direct expansion heating or cooling coils in the air flow shown in Figure 2, having a separate refrigeration circuit (water-water heat exchange unit 306), such as a water source direct expansion heat pump, in addition to reducing the risk of suffocation, more In addition to safety, the temperature and relative humidity of the controlled space 10 can be controlled more accurately.

FIG. 4 shows a schematic diagram of another embodiment of a heat exchange system 400 . The heat exchange system 400 shown in FIG. 4 is similar to the heat exchange system 300 shown in FIG. 3 . Compared with the heat exchange system 300 shown in FIG. 3 , the water-water heat exchange unit of the heat exchange system 400 shown in FIG. 4 Compressor 414 of 406 includes a variable speed compressor, the speed of which can be adjusted to vary. The first temperature sensor 442 of the heat exchange system 400 is provided in the space 10 for detecting the temperature of the space 10 . At least one controller is connected to the first temperature sensor 442 and the variable speed compressor 414 for controlling the speed of the variable speed compressor 414 according to the temperature detected by the first temperature sensor 442, thereby adjusting the first heat exchanger 410 and the second heat exchanger The flow rate of the heat exchange medium flowing in the heat exchanger 411 is controlled to control the temperature of the aqueous solution output by the second heat exchanger 411 so as to satisfy the heat required by the heating and heat exchange unit 402 to heat the air. The heat exchange system 400 shown in FIG. 4 can omit the third heat exchanger 304 , the first flow control device 340 and the second flow control device 343 in FIG. 3 , the system structure is simple, the components are few, and the cost is low.

In some embodiments, the at least one controller includes an auxiliary controller 460 located within the water-to-water heat exchange unit 406 , connected to the variable speed compressor 414 and controlling the variable speed compressor 414 . The auxiliary controller 460 may control the speed of the variable speed compressor 414 . In some embodiments, at least one controller includes a main controller 441, which is located outside the water-water heat exchange unit 406, is connected to the first temperature sensor 442 and the auxiliary controller 460, and controls the temperature detected by the first temperature sensor 442 according to the temperature detected by the first temperature sensor 442. The auxiliary controller 460 controls the variable speed compressor 414 . The main controller 441 can receive a signal representing the detected temperature generated by the first temperature sensor 442, and generate a control command to the auxiliary controller 460 according to the signal, instructing the auxiliary controller 460 to control the speed of the variable speed compressor 414, which can accurately control the . The main controller 441 is similar to the main controller 341 shown in FIG. 3 , and the auxiliary controller 460 is similar to the auxiliary controller 360 shown in FIG. 3 .

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalents or modifications made within the spirit and principles of the present application Substitutions, improvements, etc., shall all be included within the scope of protection of this application.

10: Space

20: Chilled Water Manufacturing System

300: Heat Exchange System

301: First refrigeration heat exchanger

302: Heating heat exchange unit

303: Second refrigeration heat exchanger

304: Third heat exchanger

305: Refrigeration heat exchange unit

306: Water-water heat exchange unit

310: First heat exchanger

311: Second heat exchanger

312: First water pump

313: Second water pump

314: Compressor

315: Third flow control device

317:Export

318: Entrance

320: Air Chamber

330: First Entrance

331: First Exit

332: Second Entrance

333: Second Exit

334:Export

335, 336, 344: Entrance

337, 338: Export

339, 345: Pipeline

340: First flow control device

341: Main Controller

342: First temperature sensor

343: Second flow control device

350: Chilled water flow control valve

355: Relative Humidity Sensor

356: Second temperature sensor

360: Auxiliary Controller

Claims (13)

A heat exchange system, comprising: a refrigeration heat exchange unit for receiving intake air, and for cooling and dehumidifying the intake air, comprising a first refrigeration heat exchanger and a second refrigeration heat exchanger; a heating heat exchange unit, located in The downstream of the refrigeration heat exchange unit is used to heat the air output by the refrigeration heat exchange unit; the chilled water production system is connected to the first refrigeration heat exchanger; the water-water heat exchange unit includes a first a heat exchanger and a second heat exchanger, the first heat exchanger is connected to the second refrigeration heat exchanger for receiving the aqueous solution output by the second refrigeration heat exchanger, and exchanges the second refrigeration The aqueous solution output by the heat exchanger is refrigerated and then supplied to the second refrigeration heat exchanger, and the second heat exchanger is respectively connected to the first heat exchanger and the heating heat exchange unit, and is used for cooling the refrigeration heat exchanger. The aqueous solution output by the heat exchange unit is heated and then supplied to the heating heat exchange unit; and a third heat exchanger is connected between the second heat exchanger and the heating heat exchange unit, and is connected On the pipeline connecting the first refrigeration heat exchanger and the chilled water production system, it is used to receive a part of the aqueous solution output from the second heat exchanger, and the chilled water output from the chilled water production system is used for the cooling water. Part of the aqueous solution is refrigerated and returned to the second heat exchanger. The heat exchange system of claim 1, wherein a compressor is connected between the first heat exchanger and the second heat exchanger. The heat exchange system of claim 2, wherein the compressor comprises a fixed speed compressor. The heat exchange system according to claim 1, wherein a first flow control device is provided on the pipeline connecting the third heat exchanger and the second heat exchanger, and the heat exchange system includes a main controller and a first flow control device. a temperature sensor, the first temperature sensor is used to detect the temperature in the space to be air-conditioned, the main controller is connected to the first temperature sensor and the first flow control device, and is used for according to the first temperature sensor The temperature detected by a temperature sensor controls the first flow control device to adjust the flow rate of the aqueous solution output from the second heat exchanger flowing into the third heat exchanger. The heat exchange system according to claim 4, wherein the first flow control device is connected to the pipeline output from the third heat exchanger to the second heat exchanger, and the heating and heat exchange unit outputs on the pipeline to the second heat exchanger. The heat exchange system according to claim 4, wherein a second flow control device is provided on the pipeline connecting the third heat exchanger and the chilled water production system, and the main controller is connected to the second flow control device. A device is connected for controlling the second flow control device based on the temperature detected by the first temperature sensor. The heat exchange system of claim 1, wherein the third heat exchanger comprises a water-to-water heat exchanger. The heat exchange system of claim 2, wherein the compressor comprises a variable speed compressor, the heat exchange system comprising at least one controller and a first temperature sensor for detecting the amount of air to be air-conditioned The temperature in the space, the controller is connected with the temperature sensor and the variable speed compressor, and is used for controlling the rotation speed of the variable speed compressor according to the temperature detected by the first temperature sensor. The heat exchange system of claim 8, wherein the at least one controller includes an auxiliary controller located within the water-to-water heat exchange unit, the auxiliary controller being connected to the variable speed compressor to control the variable speed compressor. The heat exchange system of claim 9, wherein the at least one controller includes a main controller located outside the water-to-water heat exchange unit, the main controller being connected to the first temperature sensor and the auxiliary a controller for controlling the auxiliary controller to control the variable speed compressor according to the temperature detected by the first temperature sensor. The heat exchange system of claim 1, wherein a third flow control device is connected between the first heat exchanger and the second heat exchanger. The heat exchange system according to claim 1, further comprising a relative humidity sensor for detecting the relative humidity of the space to be air-conditioned. The heat exchange system according to claim 1, further comprising: a second temperature sensor located downstream of the refrigeration heat exchange unit for detecting the temperature of the air flowing out from the refrigeration heat exchange unit; a chilled water flow control valve , connected to the refrigeration and heat exchange unit to the chilled water production system; and a controller, connected to the second temperature sensor and the chilled water flow control valve, for controlling the temperature detected by the second temperature sensor The chilled water flow control valve.

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