CN203190529U - Refrigerant ternary-cycle high-low temperature cold-source air conditioner - Google Patents

Abstract

The utility model belongs to the technical field of air-conditioning and refrigeration, and discloses a high-low temperature cold source air conditioner with three cycles of refrigerant, wherein: the refrigerant is compressed in two stages by a low-pressure compressor and a high-pressure compressor, and the refrigerant is compressed by a first heat exchanger. heat exchange, heat exchange with the indoor dry coil through the second heat exchanger, heat exchange with the fresh air unit through the third heat exchanger and the fourth heat exchanger, the second heat exchanger, the third heat exchanger and the The fourth heat exchanger forms a three-cycle cooling system, and the fifth heat exchanger is used to recover the remaining cooling capacity in the third heat exchanger. The utility model adopts three cycles of refrigerant and two-stage compression of a compressor, thereby improving the refrigeration coefficient and refrigeration efficiency of the refrigeration cycle. In addition, the three-cycle method for heat exchange and cooling recovery achieves the purpose of reducing the burden on the dehumidification coil of the fresh air unit and saving energy.

Description

A refrigerant three-cycle high and low temperature cold source air conditioner

technical field

The utility model belongs to the technical field of air conditioning and refrigeration, relates to an air conditioner, in particular to a high and low temperature cold source air conditioner with three cycles of refrigerant.

Background technique

At present, researchers have developed an air-conditioning system with independent temperature and humidity control, such as an air-conditioning system with independent temperature and humidity control based on solution dehumidification. See Figure 1 for its working principle. humidity. The cold water at 18°C is sent to terminal devices such as radiant panels or dry fan coils to remove the sensible heat load of the building and control the indoor temperature. The solution dehumidification system consists of a dehumidifier (fresh fan), regenerator, liquid storage tank, transmission and distribution system and pipelines.

In the solution dehumidification system, the method of decentralized dehumidification and centralized regeneration is generally adopted, and the concentrated solution after regeneration is transported to each fresh air fan. Storage function, thereby alleviating the regenerator's need for a continuous heat source, and also reducing the capacity of the entire solution desiccant air conditioning system. However, the size of the solution dehumidification unit of this system is relatively large, which requires higher requirements for the machine room than conventional air-conditioning systems, and requires a higher investment in equipment, and the equipment for producing high-temperature cold water often produces cold water that is too low in temperature, and the dry coil produces condensed water. Phenomenon.

For this reason, the Chinese invention patent (publication number: CN102635904A) discloses an air-conditioning unit with double-cycle fresh air dehumidification and coil cooling. The high and low temperature refrigerants exchange heat with the chilled water of the indoor coil and the fresh air unit respectively, thereby generating high and low temperature chilled water, which realizes the independent control of temperature and humidity to prevent the generation of condensed water in the room.

Chinese invention patent (publication number: CN102620490A) discloses an air-conditioning unit with fresh air dehumidification and dry-coil refrigeration. The air-conditioning unit divides the refrigerant passing through the expansion valve into two paths, and one path exchanges heat with the refrigerant in front of the expansion valve. Then it exchanges heat with the chilled water of the indoor coil; the other way exchanges heat with the chilled water of the fresh air unit, achieving the purpose of independent control of temperature and humidity. However, in the refrigeration cycle of the above two air-conditioning units, the burden on the dehumidification coil in the fresh air unit is relatively large, and more low-temperature refrigerant is required.

Contents of the invention

Aiming at the deficiencies of the existing technology, the utility model provides a three-cycle high and low temperature cold source air conditioner with refrigerant, one way enters the indoor coil to cool the indoor air, one way enters the fresh air unit to pre-cool the fresh air, and finally enters the fresh air unit all the way to cool the fresh air. Dehumidification treatment, such a cycle achieves the purpose of reducing the burden on the dehumidification coil of the fresh air unit.

In order to achieve the above tasks, the object of the present invention adopts the following technical solutions to achieve:

A refrigerant three-cycle high-low temperature cold source air conditioner, including a high-pressure compressor, a low-pressure compressor, a four-way reversing valve, a first electronic expansion valve, a second electronic expansion valve, a first one-way valve, and a second one-way valve , the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger, the fifth heat exchanger, the indoor dry coil and the fresh air unit, of which:

The output end of the low-pressure compressor used for primary compression of the refrigerant is connected in series with the input end of the high-pressure compressor used for secondary compression of the refrigerant;

The four ports of the four-way reversing valve are respectively connected to the input end of the tube side of the first heat exchanger, the output end of the high-pressure compressor, the output end of the shell side of the fifth heat exchanger, and the input end of the low-pressure compressor;

The input end of the tube side of the first heat exchanger is connected to the output end of the high-pressure compressor through a four-way reversing valve, and the output end of the tube side of the first heat exchanger is connected to the input end of the tube side of the fifth heat exchanger; the first heat exchanger The shell side communicates with air or groundwater for heat exchange with the refrigerant in the tube side of the first heat exchanger;

The output end of the tube side of the fifth heat exchanger is divided into two branches, the first branch is divided into two branches after passing through the first electronic expansion valve, and one branch is connected to the input end of the second heat exchanger tube side , the other branch is connected to the input end of the tube side of the fourth heat exchanger; the second branch is connected to the input end of the tube side of the third heat exchanger through the second electronic expansion valve; the input end of the shell side of the fifth heat exchanger is connected through The first one-way valve is connected to the output end of the third heat exchanger pipe side, and the remaining cold capacity of the third heat exchanger is exchanged with the refrigerant in the fifth heat exchanger tube side to recover the cold capacity; the fifth heat exchanger The output end of the shell side is connected to the input end of the low-pressure compressor through a four-way reversing valve;

The shell side of the second heat exchanger is connected to the indoor dry coil for heat exchange; the output end of the tube side of the second heat exchanger is connected to the input end of the high-pressure compressor;

The shell side of the third heat exchanger is connected with the fresh air unit for heat exchange; the output end of the pipe side of the third heat exchanger and the four-way reversing valve joint connected to the output end of the shell side of the fifth heat exchanger are installed with a second check valve;

The output end of the tube side of the fourth heat exchanger is also connected to the input end of the high-pressure compressor; the shell side of the fourth heat exchanger is also connected to the fresh air unit for heat exchange;

The first one-way valve only allows the refrigerant to flow from the output end of the pipe side of the third heat exchanger to the input end of the shell side of the fifth heat exchanger, and the first one-way valve is used for refrigerant circulation under refrigeration conditions;

The second one-way valve only allows the refrigerant to flow from the joint of the four-way reversing valve to the pipe-side output end of the third heat exchanger, and the second one-way valve is used for the circulation of the refrigerant under the heating condition.

The utility model adopts three cycles of refrigerant and two-stage compression of a compressor, thereby improving the refrigeration coefficient and refrigeration efficiency of the refrigeration cycle. In addition, the three-cycle method of heat exchange reduces the burden on the dehumidification coil of the fresh air unit, and recovers the cooling capacity to achieve the purpose of energy saving.

Description of drawings

Figure 1 is a schematic diagram of the principle of an air conditioner with independent temperature and humidity control based on the solution dehumidification method.

FIG. 2 is a schematic diagram of the overall structure of this embodiment.

The meaning of each label in the figure is: 1-high pressure compressor, 2-low pressure compressor, 3-four-way reversing valve, 4-first heat exchanger, 5-first electronic expansion valve, 6-second electronic expansion Valve, 7-second heat exchanger, 8-third heat exchanger, 9-fourth heat exchanger, 10-fifth heat exchanger, 11-indoor dry coil, 12-fresh air unit, 13-first One-way valve, 14—the second one-way valve.

Below in conjunction with accompanying drawing, the content of the present utility model is described in further detail.

Detailed ways

The specific embodiments of the present utility model are provided below, and it should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent transformations done on the basis of the technical solution of the application all fall into the protection scope of the present utility model.

Following the above technical solution, as shown in Figure 2, this embodiment provides a three-cycle high-low temperature cold source air conditioner with refrigerant, including a high-pressure compressor 1, a low-pressure compressor 2, a four-way reversing valve 3, a first electronic expansion Valve 5, second electronic expansion valve 6, first one-way valve 13, second one-way valve 14, first heat exchanger 4, second heat exchanger 7, third heat exchanger 8, fourth heat exchanger 9. The fifth heat exchanger 10, the indoor dry coil 11 and the fresh air unit 12, wherein:

The output end of the low-pressure compressor 2 for primary compression of the refrigerant is connected in series with the input end of the high-pressure compressor 1 for secondary compression of the refrigerant;

The four ports of the four-way reversing valve 3 are respectively connected to the input end of the tube side of the first heat exchanger 4, the output end of the high-pressure compressor 1, the output end of the shell side of the fifth heat exchanger 10, and the input end of the low-pressure compressor 2. connect;

The input end of the tube side of the first heat exchanger 4 is connected to the output end of the high-pressure compressor 1 through the four-way reversing valve 3, and the output end of the tube side of the first heat exchanger 4 is connected to the input end of the tube side of the fifth heat exchanger 10; The shell side of the first heat exchanger 4 communicates with air or groundwater for heat exchange with the refrigerant in the tube side of the first heat exchanger 4;

The output end of the tube side of the fifth heat exchanger 10 is divided into two branches, the first branch is divided into two branches after passing through the first electronic expansion valve 5, and one branch is connected with the tube side of the second heat exchanger 7 The input end is connected, and the other branch is connected with the input end of the tube side of the fourth heat exchanger 9; the second branch is connected with the input end of the tube side of the third heat exchanger 8 through the second electronic expansion valve 6; the fifth heat exchanger The input end of the shell side of the heat exchanger 10 is connected to the output end of the tube side of the third heat exchanger 8 through the first check valve 13, and the residual cold capacity of the third heat exchanger 8 is exchanged with the refrigerant in the tube side of the fifth heat exchanger 10. The heat exchange recovers cooling capacity, and the shell-side output end of the fifth heat exchanger 10 is connected to the input end of the low-pressure compressor 2 through the four-way reversing valve 3;

The shell side of the second heat exchanger 7 is connected to the indoor dry coil 11 for heat exchange; the output end of the tube side of the second heat exchanger 7 is connected to the input end of the high-pressure compressor 1;

The shell side of the third heat exchanger 8 is connected with the fresh air unit 12 for heat exchange; A second one-way valve 14 is installed between them;

The output end of the tube side of the fourth heat exchanger 9 is also connected to the input end of the high-pressure compressor 1; the shell side of the fourth heat exchanger 9 is also connected to the fresh air unit 12 for heat exchange;

The first one-way valve 13 only allows the refrigerant to flow from the output end of the tube side of the third heat exchanger 8 to the input end of the shell side of the fifth heat exchanger 10, and the first one-way valve 13 is used for refrigerant under cooling conditions. circulation;

The second one-way valve 14 only allows the refrigerant to flow from the joint of the four-way reversing valve 3 to the tube-side output end of the third heat exchanger 8, and the second one-way valve 14 is used for the circulation of the refrigerant under the heating condition.

The refrigerant three-cycle high-low temperature cold source air conditioner of the utility model performs two-stage compression on the refrigerant through the low-pressure compressor 2 and the high-pressure compressor 1, performs heat exchange on the refrigerant through the first heat exchanger 4, and performs heat exchange on the refrigerant through the second heat exchange The heat exchanger 7 exchanges heat with the indoor dry coil 11, and exchanges heat with the fresh air unit 12 through the third heat exchanger 8 and the fourth heat exchanger 9. The second heat exchanger 7, the third heat exchanger 8 and the fourth heat exchanger The heat exchanger 9 forms a three-cycle cooling system, and the fifth heat exchanger 10 is used to recover the remaining cooling capacity in the third heat exchanger 8 .

The working process of the refrigerant three-cycle high and low temperature cold source air conditioner in this embodiment is as follows:

In summer cooling conditions, the low-pressure compressor 2 sucks the refrigerant vapor in the fifth heat exchanger 10 through the four-way reversing valve 3, and is compressed by the low-pressure compressor 2, and the compressed refrigerant is connected with the fourth heat exchanger 9 After the refrigerant in the refrigerant is mixed, it is sucked by the high-pressure compressor 1 and compressed by the high-pressure compressor 1 to become a high-temperature and high-pressure vapor. The vapor is discharged into the first heat exchanger 4 through the four-way reversing valve 3 and then condenses into a liquid , discharged from the first heat exchanger 4; the discharged refrigerant enters the fifth heat exchanger to exchange heat with the remaining cold capacity of the refrigerant flowing out of the third heat exchanger, and after heat exchange, the refrigerant from the fifth heat exchanger 10 The refrigerant discharged from the tube side enters the two electronic expansion valves 5 and 6 for adiabatic expansion respectively, and the refrigerant expanded by the electronic expansion valve 5 is divided into two paths: one path enters the second heat exchanger 7 to absorb the heat of the cooled medium, To produce high-temperature cold water, the other refrigerant flows into the fourth heat exchanger 9 to absorb the heat of the cooled medium to produce high-temperature cold water, and then the two refrigerants meet in front of the high-pressure compressor 1 and are sucked by the high-pressure compressor 1; The refrigerant expanded by the electronic expansion valve 6 is throttled and depressurized to form low-temperature and low-pressure wet steam, which enters the third heat exchanger 8 to absorb the heat of the cooled medium to produce low-temperature cold water. The low-temperature and low-pressure refrigerant passes through the first one-way The valve 13 flows into the shell side of the fifth heat exchanger 10 to exchange heat with the refrigerant flowing out of the first heat exchanger 4. After the heat exchange, the refrigerant vapor discharged from the shell side of the fifth heat exchanger 10 passes through the four-way exchange. The valve 3 is sucked by the low-pressure compressor 2 to complete the refrigerant cycle. The high-temperature cold water in the indoor dry coil 11 connected to the second heat exchanger 7 exchanges heat with the indoor air to control the indoor temperature, and the low-temperature cold water in the fresh air unit coil 12 connected to the third heat exchanger 8 controls the fresh air. For dehumidification, the high-temperature cold water in another coil of the fresh air unit connected to the fourth heat exchanger 9 precools the fresh air to complete the water cycle. Integrated refrigerant circulation and water system circulation to complete the refrigeration process.

In winter heating conditions, the fresh air no longer needs to be dehumidified, the refrigerant flows in reverse, the input end of the heat exchanger becomes the output end, and the output end of the heat exchanger becomes the input end. At this time, the refrigerant compressed by the low-pressure compressor 2 enters the fourth heat exchanger 9 and the second heat exchanger 7 respectively to release heat to produce high-temperature water. Valve 5 throttling and lowering pressure turns into low-temperature and low-pressure refrigerant; high-temperature and high-pressure refrigerant vapor compressed by high-pressure compressor 1 enters third heat exchanger 8 through four-way reversing valve 3 and second check valve 14, The refrigerant releases heat, and the refrigerant liquid after heat release is throttled and depressurized by the electronic expansion valve 6 and mixed with the refrigerant throttled and depressurized by the electronic expansion valve 5, and the mixed refrigerant passes through the fifth heat exchanger 10 The tube side directly enters the first heat exchanger 4 to absorb outdoor air or heat without performing heat exchange, and the refrigerant discharged from the first heat exchanger 4 is finally inhaled by the low-pressure compressor 2 to complete the refrigerant cycle. The high-temperature hot water in the indoor coil 11 connected to the second heat exchanger 7 exchanges heat with the indoor air to increase the indoor temperature. In the coil connected to the third heat exchanger 8 and the fourth heat exchanger 9 The high-temperature hot water directly enters the fresh air unit 12 to heat the outdoor fresh air and increase the temperature of the fresh air, thus completing the water system cycle, integrating the refrigerant cycle and the water system cycle to complete the heating process, and the cycle can be repeated.

Claims (1)

1. A refrigerant three-cycle high-low temperature cold source air conditioner, including a high-pressure compressor (1), a low-pressure compressor (2), a four-way reversing valve (3), a first electronic expansion valve (5), and a second electronic expansion valve. Expansion valve (6), first one-way valve (13), second one-way valve (14), first heat exchanger (4), second heat exchanger (7), third heat exchanger (8) , the fourth heat exchanger (9), the fifth heat exchanger (10), the indoor dry coil (11) and the fresh air unit (12), wherein: The output end of the low-pressure compressor (2) for primary compression of the refrigerant is connected in series with the input end of the high-pressure compressor (1) for secondary compression of the refrigerant; The four ports of the four-way reversing valve (3) are respectively connected to the input end of the tube side of the first heat exchanger (4), the output end of the high-pressure compressor (1), and the output end of the shell side of the fifth heat exchanger (10) in sequence. and the input end of the low-pressure compressor (2); The input end of the tube side of the first heat exchanger (4) is connected to the output end of the high-pressure compressor (1) through the four-way reversing valve (3), and the output end of the tube side of the first heat exchanger (4) exchanges heat with the fifth connected to the input end of the tube side of the heat exchanger (10); the shell side of the first heat exchanger (4) communicates with air or groundwater for heat exchange with the refrigerant in the tube side of the first heat exchanger (4); It is characterized by: The output end of the tube side of the fifth heat exchanger (10) is divided into two branches, the first branch is divided into two branches after passing through the first electronic expansion valve (5), and one branch exchanges heat with the second connected to the input end of the tube side of the device (7), and another branch is connected to the input end of the tube side of the fourth heat exchanger (9); the second branch is connected to the third heat exchanger ( 8) The input end of the tube side is connected; the input end of the shell side of the fifth heat exchanger (10) is connected to the output end of the tube side of the third heat exchanger (8) through the first check valve (13) to connect the third heat exchanger ( 8) The remaining cooling capacity is exchanged with the refrigerant in the tube side of the fifth heat exchanger (10) to recover the cooling capacity, and the output end of the shell side of the fifth heat exchanger (10) passes through the four-way reversing valve (3) and The input ends of the low-pressure compressor (2) are connected; The shell side of the second heat exchanger (7) is connected to the indoor dry coil (11) for heat exchange; the output end of the tube side of the second heat exchanger (7) is connected to the input end of the high-pressure compressor (1); The shell side of the third heat exchanger (8) is connected to the fresh air unit (12) for heat exchange; the output end of the tube side of the third heat exchanger (8) is connected to the output end of the shell side of the fifth heat exchanger (10) A second one-way valve (14) is installed between the joints of the four-way reversing valve (3); The output end of the tube side of the fourth heat exchanger (9) is also connected to the input end of the high-pressure compressor (1); the shell side of the fourth heat exchanger (9) is also connected to the fresh air unit (12) for heat exchange; The first one-way valve (13) only allows refrigerant to flow from the tube-side output end of the third heat exchanger (8) to the shell-side input end of the fifth heat exchanger (10), and the first one-way valve (13) Used for refrigerant circulation under refrigeration conditions; The second one-way valve (14) only allows the refrigerant to flow from the joint of the four-way reversing valve (3) to the output end of the tube side of the third heat exchanger (8), and the second one-way valve (14) is used to control Refrigerant circulation under hot conditions.

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