WO2016119369A1

WO2016119369A1 - Water chiller-heater unit with tube-and-plate type compound heat exchanging evaporative condenser

Info

Publication number: WO2016119369A1
Application number: PCT/CN2015/081400
Authority: WO
Inventors: 李志明; 谭栋; 张勇
Original assignee: 广州市华德工业有限公司
Priority date: 2015-01-28
Filing date: 2015-06-12
Publication date: 2016-08-04
Also published as: CN105987534A

Abstract

A water chiller-heater unit with a tube-and-plate type compound heat exchanging evaporative condenser comprises a compressor (5), an evaporative condenser (4), a throttling device (6), and an evaporator (7). The evaporative condenser (4) comprises a fan (41), a water pump (42), a water distributor (43), and a collecting basin (44). The evaporative condenser (4) further comprises a tube-and-plate type compound heat exchanger. The tube-and-plate type compound heat exchanger (45) is formed by connecting multiple tube-and-plate type compound heat exchange sheets between an inlet header and an outlet header. The tube-and-plate type compound heat exchange sheets comprise a heat transfer plate (2) and a coil pipe (1) formed by a shaped heat exchange pipe. The heat transfer plate (2) is provided with an accommodation groove (21). The shape of the accommodation groove (21) matches the shape of the coil pipe (1). The coil pipe (1) is placed in the accommodation groove (21). The gap between the coil pipe (1) and the accommodation groove (21) is filled with a thermally conductive bonding layer (3). The thermally conductive bonding layer (3) ensures full contact between the heat transfer plate (2) and the coil pipe (1), thereby enlarging the effective heat exchange area. The heat transfer plate (2) can also drain cooling water to form a continuous water flow surface, thereby increasing the evaporation surface area of the cooling water, improving heat exchange efficiency and also reducing condenser size.

Description

Hot and cold water unit with plate tube composite heat exchange type evaporative condenser

Technical field

The invention relates to the field of heat exchange equipment, in particular to a cold and hot water unit with a plate type and a coil type composite type evaporative condenser.

Background technique

At present, the chiller and hot water unit on the market usually uses a curved coil to form a heat exchanger, and the outer surface of the heat exchanger is cooled by spray water, and the circulating spray water is used to evaporate and remove heat. However, the outer surface of the heat exchanger tube of the coil heat exchanger is generally a smooth surface, and the heat exchange efficiency is low. At the same time, the surface area of the cooling water evaporating heat transfer is small, and the spacing of the coils needs to be increased to increase the heat exchange time between the cooling water and the air, resulting in a bulky volume of the entire heat exchanger. On the other hand, since there is no medium to guide the flow of cooling water between the upper and lower tubes of the coil, when the cooling water descends from above, under the traction of the vertical wind direction, the cooling water is disorderly fluttering and easy to generate flying water, and the coil is clothed. The water is uneven, easy to store dry spots, reduce heat exchange capacity and there is a risk of scaling.

In the patent of the applicant's earlier application number CN202836298U, a heat exchange tube for a coupling coupling coil evaporative condenser is disclosed, and a filler sheet is installed between the coils to guide the spray water to form a water film, and the solution is solved. The problem of disorderly flying water of cooling water. The multi-piece packing piece is attached to the coil tube by means of a buckle or the like, and the installation and disassembly are cumbersome; in such a mounting manner, the packing piece and the coil tube are not closely installed, which can meet the requirement of guiding the spray water to form a water film. However, the need for direct heat exchange with the coil cannot be met, and the filler sheet is not a heat exchange material and cannot exchange heat with the coil. Therefore, although the invention patent improves the heat exchange efficiency to some extent, However, since the heat exchange efficiency is improved only by increasing the utilization rate of the cooling water, the heat exchange efficiency is not greatly improved.

Summary of the invention

In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to increase the heat exchange efficiency to a greater extent by changing the heat exchange structure of the coil.

In order to solve the above technical problems, the technical solution adopted by the present invention is a cold water unit with a plate and tube composite heat exchange type evaporative condenser, including a compressor, an evaporative condenser, a throttling device and an evaporator; The evaporative condenser comprises a fan, a water pump, a water distributor and a sump; the evaporative condenser further comprises a plate-tube composite heat exchanger; the plate-tube composite heat exchanger is passed by a plurality of plate-tube composite heat exchangers The inlet tube and the outlet header are connected; the plate tube composite heat exchange sheet comprises a heat transfer plate and a coil processed by the heat exchange tube; the heat transfer plate is provided with a seating groove, and the groove is disposed The shape matches the shape of the coil; the coil is placed in the seating groove, and the gap between the coil and the seating groove is filled with a thermally conductive adhesive layer. The heat transfer plate can guide the spray cooling water from the upper heat exchange tube to the lower heat exchange tube to improve the utilization of the cooling water; and at the same time, the heat conductive adhesive layer fills the gap between the full coil and the heat transfer plate to make the disk The tube is in full contact with the heat transfer plate, and the heat transfer plate becomes a rib of the coil, increasing the effective heat exchange area of the coil.

Preferably, the thermally conductive adhesive layer is a metal filler. Such a structure can be realized by soaking liquid metal and then cooling, so that the heat conductive adhesive layer can be sufficiently filled into the gap, and the heat conductivity of the metal is good, thereby further improving the rib formation of the heat transfer sheet.

More preferably, the gap between the coil and the seating groove is less than 10 mm. Such a knot The structure gap is small. When the liquid metal is immersed, due to the viscosity of the liquid metal, the liquid metal will have a capillary action, and after penetrating into the inner surface of the heat transfer plate and the coil contact surface, a uniform layer can be formed in the contact surface. The thin filler not only completely fuses the heat transfer plate and the coil into a whole body, but also has a thin filling layer to reduce the contact thermal resistance between the heat transfer plate and the coil.

More preferably, the heat transfer sheet is also stamped with a plurality of limiting slots and/or positioning pads. Such a structure ensures that the gap between the coil and the heat transfer plate can be sufficiently small when the liquid metal is immersed.

Preferably, the metal filler is one or more of zinc, tin, aluminum, and copper. These metals have low melting point and low price, and are used for liquid metal immersion, which is extremely cost-effective.

In a preferred embodiment, the thermally conductive adhesive layer is a thermally conductive adhesive. Direct use of thermal adhesives makes processing easier.

Preferably, the exhaust port of the compressor is connected to the gas pipe of the evaporative condenser, and the liquid pipe of the evaporative condenser is connected to the liquid pipe of the evaporator through the throttling device, and the gas pipe of the evaporator and the suction of the compressor Air port connection.

Preferably, the exhaust port of the compressor is connected to the gas pipe of the evaporative condenser, and the liquid pipe of the evaporative condenser is connected to the liquid pipe of the evaporator through the throttling device, and the gas pipe of the evaporator and the suction of the compressor a port connection, the chiller unit is provided with a first refrigerating valve, a second refrigerating valve, a first heat pump valve and a second heat pump valve; the first refrigerating valve is disposed at an exhaust port of the compressor and evaporative condensation On the connecting pipe of the gas pipe of the device, the second refrigerating valve is disposed on the connecting pipe of the suction port of the compressor and the gas pipe of the evaporator, and the first heat pump valve is disposed at the exhaust port of the compressor and the gas of the evaporator On the connecting pipe of the pipe, the second heat pump valve is set at the pressure The suction port of the reducer is connected to the gas pipe of the evaporative condenser.

Preferably, the exhaust port of the compressor is provided with a first reversing valve, and the suction port of the compressor is provided with a second reversing valve; the two outlets of the first reversing valve are respectively connected with the gas of the evaporating condenser The tube and the gas pipe of the evaporator are connected, and the two inlets of the second reversing valve are respectively connected with the gas pipe of the evaporative condenser and the gas pipe of the evaporator; the first and second reversing valves are two-position three-way Directional valve.

Preferably, the hot and cold water unit is provided with a four-way reversing valve, and the four interfaces of the four-way reversing valve are respectively connected with a compressor exhaust port, a gas pipe of an evaporative condenser, a gas pipe of an evaporator, and a compressor. The suction port is connected.

Compared with the prior art, the hot and cold water unit with the plate tube composite heat exchange type evaporative condenser has the following beneficial effects:

1) The thermal conductive adhesive layer makes the heat transfer plate and the coil fully contact, so that the coil can generate a ribbing effect through the heat exchange plate and increase the effective heat exchange area;

2) The heat exchange plate can simultaneously drain the cooling water to form a continuous water flow surface, and increase the evaporation surface area of the cooling water;

3) Increasing the effective heat exchange area and the evaporation water evaporation area not only improves the heat exchange efficiency, but also helps to reduce the condenser volume.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

DRAWINGS

1 is a schematic view showing the principle of a refrigeration cycle mode of a hot and cold water unit with a plate and tube composite heat exchange type evaporative condenser;

2 is a schematic view showing the principle of a hot and cold water unit with a plate and tube composite heat exchange type evaporative condenser according to the present invention;

3 is a schematic view showing the principle of a heat pump circulation mode of a hot and cold water unit with a plate and tube composite heat exchange type evaporative condenser according to the present invention;

4 is a schematic view showing the principle of using a two-position three-way reversing valve for a group of a hot and cold water unit with a plate and tube composite heat exchange type evaporative condenser according to the present invention;

5 is a schematic view showing the principle of using a four-way reversing valve for a group of a hot and cold water unit with a plate and tube composite heat exchange type evaporative condenser;

Figure 6 is a schematic view showing the structure of an evaporative condenser of a hot and cold water unit with a plate and tube composite heat exchange type evaporative condenser according to the present invention.

7 is a schematic structural view of a plate-tube composite heat exchange sheet of a hot and cold water unit with a plate-tube composite heat exchange type evaporative condenser according to the present invention.

8 is a schematic view showing the structure of a heat transfer plate of a plate-tube composite heat exchange sheet of a hot and cold water unit with a plate-tube composite heat exchange type evaporative condenser according to the present invention.

Figure 9 is a cross-sectional view taken along line A-A of Figure 7.

detailed description

To further illustrate the technical means and efficacy of the present invention in order to achieve the intended purpose of the invention, the following detailed description of the embodiments The structure, characteristics and efficacy are described in detail as follows:

Example 1

1 is a schematic view showing the principle of a refrigeration cycle mode of a hot and cold water unit with a plate and tube composite heat exchange type evaporative condenser according to the present invention. As can be seen from FIG. 1, the hot and cold water unit includes a compressor 5 and an evaporation type. a condenser 4, an expansion device 6 and an evaporator 7; an exhaust port 51 of the compressor 5 is connected to a gas pipe 4a of the evaporative condenser 4, and a liquid pipe 4b of the evaporative condenser 4 is passed through a throttling device 6 The liquid pipe 7a of the evaporator 7 is connected, and the gas pipe 7b of the evaporator 7 is connected to the suction port 52 of the compressor 5. The evaporative condenser 4 employs a plate-tube composite heat exchange sheet, which will not be described in detail herein.

Working principle: when the refrigerant is compressed by the compressor 5 into a high temperature and high pressure state, the refrigerant enters the evaporative condenser 4 through the pipeline of the refrigeration system. After passing through the evaporative condenser 4, the gas in the high temperature and high pressure state is cooled into a low temperature and high pressure liquid, and The low-temperature low-pressure liquid is formed in the evaporator 7 through the throttling device 6 to exchange heat with the chilled water to prepare cold water, and then the refrigerant liquid is evaporated and vaporized in the evaporator 7 and sucked away by the compressor 5 to complete the refrigeration cycle mode;

Example 2

2 is a schematic view showing the principle of the cold and hot water unit of the present invention, which is different from the first embodiment in that the hot and cold water unit is provided with a first refrigeration valve 81, a second refrigeration valve 82, and a first a heat pump valve 83 and a second heat pump valve 84; the first refrigerant valve 81 is disposed on a connecting line of the exhaust port 51 of the compressor 5 and the gas pipe 4a of the evaporative condenser 4, and the second refrigerating valve 82 is disposed in the compression On the connection line between the intake port 52 of the machine 5 and the gas pipe 7b of the evaporator 7, the first heat pump valve 83 is disposed on the connection line between the exhaust port 51 of the compressor 5 and the gas pipe 7b of the evaporator 7, The second heat pump valve 84 is disposed at the suction port of the compressor 5 52 is connected to the gas pipe 4a of the evaporative condenser 4. Therefore, the hot and cold water unit has a refrigeration cycle mode and a heat pump cycle mode. Also, the evaporative condenser 2 employs a plate-tube composite heat exchange sheet.

Working principle: When the heat pump is in the circulation mode, as shown in FIG. 3, the first heat pump valve 83 and the second heat pump valve 84 are opened at this time, and the first refrigeration valve 81 and the second refrigeration valve 82 are closed, and the refrigerant passes through the compressor. 5 After the gas is compressed into a high temperature and high pressure state, the refrigerant enters the evaporator 7 through the pipeline of the refrigeration system, exchanges heat with the low temperature hot water, and obtains high temperature hot water, and then the gas in the high temperature and high pressure state is cooled into a low temperature and high pressure liquid, and is throttled. The apparatus 6 forms a low temperature and low pressure liquid into the evaporative condenser 4, and then the refrigerant liquid evaporates and vaporizes in the evaporative condenser 4 and is sucked away by the compressor 1, completing the heat pump circulation mode.

Example 3

4 is a schematic view showing the principle of using a two-position three-way reversing valve for the cold and hot water unit of the present invention, which is different from the first embodiment in that the exhaust port 51 of the compressor 5 is provided with a first The two-position three-way reversing valve 85, the suction port 52 of the compressor is provided with a second two-position three-way reversing valve 86; the two outlets of the first two-position three-way reversing valve 85 are respectively connected with the evaporative condenser The gas pipe 4a is connected to the gas pipe 7b of the evaporator, and the two inlets of the second two-position three-way switching valve 86 are connected to the gas pipe 4a of the evaporative condenser and the gas pipe 7b of the evaporator, respectively. Similarly, the evaporative condenser 4 plate tube composite heat exchange sheet.

Example 4

Fig. 5 is a schematic view showing the principle of the four-way reversing valve of the cold and hot water unit of the present invention, which is different from the first embodiment in that the four ports of the four-way reversing valve 87 are respectively connected to the compressor. Exhaust port 51, gas tube 4a of the evaporative condenser, gas of the evaporator The body tube 7b is connected to the suction port 52 of the compressor. Also, the evaporative condenser 4 employs a plate-tube composite heat exchange sheet.

The evaporative condenser 4 used in the above embodiment will be described in detail below.

As shown in FIG. 6, the evaporative condenser 4 includes a fan 41, a water pump 42, a water distributor 43, a sump 44; and a plate-tube composite heat exchanger 45; the plate-tube composite heat exchanger 45 is located at the water distributor 43. Between the sump 44, the water distributor 43 and the sump 44 are connected by a water pump 42; the fan 41 is located at one end of the plate-tube composite heat exchanger 45. The plate tube composite heat exchanger 45 is composed of a plurality of plate tube composite heat exchange sheets connected through an inlet header and an outlet header. As shown in FIG. 7 and FIG. 8 , the plate tube composite heat exchange sheet includes a coil 1 processed by a heat exchange tube (the processing may be a bending of a long heat exchange tube into a coil tube, or may be The heat exchange tubes of the curved section are welded together with the heat exchange tubes of the straight section to form a coil), and the heat transfer sheet 2 is also included. In this embodiment, the coil 1 is formed by continuous S-shaped bending of the heat exchange tubes, wherein the straight sections of the heat exchange tubes are substantially parallel or non-parallel, and the coil 1 can also adopt other suitable for use in the evaporation condenser. shape. The heat exchange tube of the coil 1 may be a copper tube, a stainless steel tube or a galvanized steel tube, etc., and the cross-sectional shape of the internal flow passage may be a circular shape, an elliptical shape, a spiral shape, a corrugated shape or an olive shape. As can be understood by those skilled in the art, the inner and outer surfaces of the coil 1 can adopt a smooth surface, preferably an enhanced heat transfer surface provided with internal and external threads, and the outer surface of the coil 1 can also be provided with a hydrophilic or anti-corrosive coating. Floor. The coil 1 is provided with an inlet and an outlet of a flow passage for connection with an inlet header and an outlet header. In this embodiment, the heat exchange tube is bent with a plurality of straight pipe sections; the straight pipe sections adjacent to the heat exchange pipe are parallel to each other, and the pipe spacing of the straight pipe sections adjacent to the heat exchange pipe is the same, or the pipe spacing is located The lower layer that receives the spray cooling water first receives the lower layer of the spray cooling water gradually becomes smaller; or the length of the straight pipe section of the heat exchange tube The degree gradually increases from the upper layer which is first received by the cooling water spray to the lower layer which receives the spray cooling water. The material of the heat transfer sheet 2 may be a carbon steel sheet, a stainless steel sheet, an aluminum sheet, a copper sheet or the like. The plate-tube composite heat exchange fins are disposed longitudinally, that is, the cooling wind blown by the fan 41 flows along the longitudinal direction of the coil pipe 1.

As shown in FIG. 8 and FIG. 9 , the heat transfer plate 2 is provided with a receiving groove 21 . In the embodiment, the receiving groove 21 is realized by punching the heat transfer plate 2 , or may be produced. The heat transfer sheet 2 is directly formed; the shape of the seating groove 21 matches the shape of the coil 1. The coil 1 is placed in the seating groove 21, and a gap between the coil 1 and the seating groove 21 is filled with a thermally conductive adhesive layer 3. In this embodiment, the thermally conductive adhesive layer 3 is a metal filler zinc. The specific method may be that the heat transfer sheet 2 and the coil 1 are immersed in the high temperature liquid zinc, so that the liquid zinc flows into the gap between the coil 1 and the seating groove 21, and the gap is filled, and the liquid metal is adhered. When the liquid metal is cooled and solidified into a solid state, the heat conductive adhesive layer 3 is filled between the coil 1 and the seating groove 21 to fix the both. In addition to zinc, tin, aluminum, copper and other metals or combinations thereof can be used, all of which have the characteristics of low melting point and low price, and are cost-effective.

Further, in this embodiment, the gap between the coil 1 and the seating groove 21 is less than 10 mm. When the liquid metal is immersed, due to the viscosity of the liquid metal, the liquid metal may undergo capillary action, infiltration and transmission. After the hot plate 2 and the inside of the contact surface of the coil 1, the thermally conductive adhesive layer 3 formed in the gap of the contact can be made uniform and thin, and the heat transfer sheet 2 and the coil 1 are completely fused together as a whole. Moreover, since the thickness of the thermally conductive adhesive layer 3 is thin, the contact thermal resistance between the heat transfer sheet 2 and the coil 1 is effectively reduced. The smaller the gap between the coil 1 and the seating groove 21, the more obvious the capillary action of the liquid metal permeation is formed. The more uniform the thermal conductive adhesive layer 3 will be, the greater the relative cost and the difficulty of processing; the gap width of 10 mm is the cost-optimal choice, and the gap width of 5 mm is the best cost-effective option, and the uniform effect is optimal within 3 mm. select. Furthermore, in order to ensure that the high temperature liquid metal is immersed, the distance between the coil 1 and the heat transfer plate 2 can be sufficiently small, and a plurality of limit grooves and/or positioning pads can be punched out on the heat transfer plate 2 (Fig. Not shown), before the immersion, the coil 1 is pre-fixed by the limit slot mounting or the positioning of the solder joint. It is also possible to pre-fix the two by means of a clamp, but the operation is complicated.

The heat of the coil 1 is conducted to the heat transfer sheet 2 through the thermally conductive adhesive layer 3, and the heat transfer sheet 2 becomes the rib of the coil 1, which greatly increases the heat exchange area and directly enhances the heat exchange effect of the coil 1; The hot plate 2 has the effect of guiding the cooling water, so that the cooling water forms a continuous water flow on the surface of the heat transfer plate 2, avoids the disordered flying water of the cooling water, and improves the utilization rate of the cooling water. In addition, since the heat transfer sheet 2 is integrated, the cooling water at the coupling with the coil 1 can be prevented from flowing alternately, and the water distribution rate can be ensured.

On the other hand, the thermal conductive adhesive layer 3 can be replaced by a thermal conductive adhesive; the thermal conductive adhesive is evenly applied to the mounting groove 21 of the heat transfer plate 2, and the coil 1 is directly placed into the mounting groove 21. It can be bonded (for some thermal adhesives that need to be combined, it is also necessary to apply a matching thermal adhesive on the coil 1), which is easy to install and simple in process. However, the existing thermal conductive adhesives, such as silicone thermal conductive adhesives, epoxy resin AB adhesives, and polyurethane thermal conductive adhesives, are not as strong as zinc, aluminum, etc., and are prone to unevenness during the laminating process, resulting in unevenness. When the coil 1 is adhered to the seating groove 21, an air layer insulation phenomenon may occur, which affects heat exchange efficiency.

In addition, openings, corrugations, bends, and water guides may be provided on the heat transfer plate 2. Structures such as dovetail grooves and ribs are used to increase the effect of water distribution, prevent flying water and enhance solidity. Further, a plurality of elongated holes, round holes or other shaped through holes (not shown) may be formed at the mounting groove 21, and when the coil 1 is placed in the seating groove 21, a part of the coil 1 may be exposed. Outside the tank 21, it can be directly in contact with the condensed water. This method can increase the direct contact area between the coil and the water. At the same time, the opening of the hole can disturb the heat transfer of the copper tube due to the uneven flow of water, but it is certain To a lesser extent, the ribbing of the heat transfer sheets is weakened.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention belong to the present invention. The scope of the claim.

Claims

A hot and cold water unit with a tube-tube composite heat exchange type evaporative condenser, comprising a compressor, an evaporative condenser, a throttling device and an evaporator; the evaporative condenser comprises a fan, a water pump, a water distributor, a collecting pool; characterized in that: the evaporative condenser further comprises a plate-tube composite heat exchanger; the plate-tube composite heat exchanger is composed of a plurality of plate-tube composite heat-exchange sheets connected through an inlet header and an outlet header; The plate tube composite heat exchange sheet comprises a heat transfer plate and a coil processed by the heat exchange tube; the heat transfer plate is provided with a seating groove, and the shape of the receiving groove matches the shape of the coil; the coil Placed in the mounting groove, the gap between the coil and the mounting groove is filled with a thermally conductive adhesive layer.
The hot and cold water unit with a tube-tube composite heat exchange type evaporative condenser according to claim 1, wherein the heat conductive adhesive layer is a metal filler.
The hot and cold water unit with a plate tube composite heat exchange type evaporative condenser according to claim 2, wherein a gap between the coil and the seating groove is less than 10 mm.
The hot and cold water unit with a plate tube composite heat exchange type evaporative condenser according to claim 3, wherein the heat transfer plate is further stamped with a plurality of limiting grooves and/or positioning pads.
The hot and cold water unit with a tube-tube composite heat exchange type evaporative condenser according to claim 2, wherein the metal filler is one or more of zinc, tin, aluminum and copper.
The hot and cold water unit with a plate tube composite heat exchange type evaporative condenser according to claim 1, wherein the heat conductive adhesive layer is a heat conductive adhesive.
The hot and cold water unit with a plate tube composite heat exchange type evaporative condenser according to claim 1, wherein: the exhaust port of the compressor and the gas of the evaporative condenser The tube is connected, and the liquid tube of the evaporative condenser is connected to the liquid tube of the evaporator through a throttling device, and the gas tube of the evaporator is connected to the suction port of the compressor.
The hot and cold water unit with a plate tube composite heat exchange type evaporative condenser according to claim 1, wherein the exhaust port of the compressor is connected to a gas pipe of the evaporative condenser, and the evaporative condenser The liquid pipe is connected to the liquid pipe of the evaporator through a throttling device, and the gas pipe of the evaporator is connected to the suction port of the compressor, and the hot and cold water unit is provided with a first refrigeration valve, a second refrigeration valve, and a first heat. a pump valve and a second heat pump valve; the first refrigerating valve is disposed on a connecting line of the exhaust port of the compressor and the gas pipe of the evaporating condenser, and the second refrigerating valve is disposed at the suction port of the compressor and the evaporator On the connecting pipe of the gas pipe, the first heat pump valve is disposed on the connecting pipe of the exhaust port of the compressor and the gas pipe of the evaporator, and the second heat pump valve is disposed at the suction port of the compressor and the evaporative condenser On the connecting line of the gas pipe.
The hot and cold water unit with a plate-tube composite heat exchange type evaporative condenser according to claim 1, wherein the exhaust port of the compressor is provided with a first reversing valve, and an intake port of the compressor. a second reversing valve is provided; the two outlets of the first reversing valve are respectively connected with the gas pipe of the evaporative condenser and the gas pipe of the evaporator, and the two inlets of the second reversing valve are respectively connected with the evaporative condenser The gas pipe is connected to the gas pipe of the evaporator; the first and second reversing valves are two-position three-way reversing valves.
The hot and cold water unit with a tube-tube composite heat exchange type evaporative condenser according to claim 1, wherein the hot and cold water unit is provided with a four-way reversing valve and four four-way reversing valves. The interface is respectively connected to a compressor discharge port, a gas pipe of the evaporative condenser, a gas pipe of the evaporator, and an intake port of the compressor.