CN101576297B - Big supercooling degree completely fresh air air processing machine set - Google Patents

Abstract

The unit of the present invention, its outdoor processing unit heat exchanger is composed of two parallel condensing pipes, and the subcooler is located between the two parallel condensing pipes of the outdoor processing unit heat exchanger; its refrigeration/heating cycle is as follows: under refrigeration conditions, the refrigerant After condensation and supercooling, it is sent to the heat exchanger of the indoor air supply unit for heat exchange, and finally returned to the compressor to complete the entire refrigeration cycle process. Under heating conditions, the refrigerant passes through the compressor to the heat exchanger of the indoor air supply unit for heat exchange, then to the subcooler for supercooling, then enters the heat exchanger of the outdoor processing unit, and finally returns to the compressor to complete the entire heating cycle process. The refrigerant of the present invention realizes supercooling after the liquid receiver, and solves the problem of reducing the degree of supercooling. The subcooler is located between the two parallel condensing pipes of the heat exchanger of the outdoor processing unit, which can effectively use the strong air flow field in the middle of the fan to increase the actual supercooling effect of the system. The subcooling degree of the system enhances the stability and reliability of the expansion valve, and improves the cooling capacity and energy efficiency ratio of the system.

Description

A new fresh air air handling unit with large subcooling degree

Technical field:

The invention relates to a fresh air handling unit, in particular to a fresh air handling unit with a large supercooling degree. In this system, the refrigerant passes through the high-pressure accumulator and then enters the subcooler located in the middle of the heat exchanger of the outdoor processing unit. The system can stably achieve an effective subcooling above 8°C, which is conducive to the stable operation of the expansion valve, increases the cooling capacity of the system, and improves the energy efficiency ratio of the system. It belongs to the technical field of building environment and equipment engineering.

Background technique:

At present, the vast majority of direct evaporative fresh air air handling units do not have subcooling equipment, and a small number of systems are equipped with subcoolers. The location of the subcooler often greatly affects the actual subcooling effect of the system. This will bring a series of problems, such as unstable operation of the expansion valve, low cooling energy efficiency ratio (EER), insufficient cooling capacity, etc. These all affect the use effect of the direct evaporative fresh air air handling unit to a certain extent.

Invention content:

The present invention aims at the defects existing in the prior art. In order to improve the operating conditions of the unit, facilitate the stable operation of the expansion valve, increase the cooling capacity of the system, and improve the energy efficiency ratio of the system, a fresh air treatment system with a large supercooling degree is proposed. unit. In this system, the refrigerant first passes through the high-pressure accumulator, and then enters the subcooler located in the middle of the heat exchanger of the outdoor processing unit; the system can stably achieve an effective subcooling above 8°C, which can effectively increase the system subcooling degree and improve Self-operating conditions; increase the cooling capacity and improve the energy efficiency ratio (EER) of the system cooling.

The large subcooling fresh air air handling unit designed by the present invention to achieve the purpose of the invention has a structure including a compressor, a four-way reversing valve, an outdoor processing unit heat exchanger, a liquid reservoir, a subcooler, an expansion valve (section Flow valve) and indoor air supply unit heat exchanger. The outdoor processing unit heat exchanger is composed of two parallel condensing pipes, and the subcooler is located between the two parallel condensing pipes of the outdoor processing unit heat exchanger. The compressor is respectively connected to the heat exchanger of the outdoor processing unit and the heat exchanger of the indoor air supply unit after passing through the four-way reversing valve; Air unit heat exchanger connection. Its cooling/heating cycle is as follows:

Under the cooling condition, the refrigerant passes through the compressor and condenses from the four-way reversing valve to the heat exchanger of the outdoor processing unit (the condenser at this time), then enters the liquid receiver, and then goes to the subcooler for subcooling, and passes through the throttling The valve is sent to the indoor air supply unit heat exchanger (evaporator at this time) for heat exchange, and finally the refrigerant passes through the four-way reversing valve again and returns to the compressor to complete the entire refrigeration cycle process.

Under heating conditions, the refrigerant passes through the compressor from the four-way reversing valve to the heat exchanger of the indoor air supply unit for heat exchange, then enters the liquid receiver, and then goes to the subcooler for supercooling, and then enters the outdoor treatment through the throttle valve. The unit heat exchanger, and finally the refrigerant returns to the compressor through the four-way reversing valve again to complete the entire heating cycle.

Compared with the prior art, the present invention has the following beneficial effects:

1. The refrigerant is supercooled after the accumulator, which effectively solves the problem that the traditional refrigerant enters the accumulator after being supercooled, and the subcooling degree is reduced.

2. The subcooler is located between the two parallel condenser pipes of the heat exchanger of the outdoor processing unit, which can effectively use the strong air flow field in the middle of the fan to increase the actual supercooling effect of the system.

3. The higher system subcooling degree ensures that no air bubbles exist when the refrigerant passes through the expansion valve, which enhances the stability and reliability of the expansion valve.

4. The increase of subcooling degree effectively increases the cooling capacity of the system and improves the cooling energy efficiency ratio (EER) of the system.

Description of drawings:

Fig. 1 is a schematic diagram of the principle of a new fresh air air handling unit with large subcooling degree according to the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. 

Example:

As shown in Figure 1, the compressor 14 is respectively connected to the outdoor processing unit heat exchanger 1 and the indoor air supply unit heat exchanger 11 after passing through the four-way reversing valve 15; the outdoor processing unit heat exchanger 1 passes through the liquid reservoir (high pressure Liquid storage tank) 13, subcooler 3, throttle valve 6 and indoor air supply unit heat exchanger 11 are connected; through the four-way reversing valve 15, two different working conditions of heating and cooling in winter and summer can be changed ; At the same time, in the different cycles of heating and cooling, through the cut-off and conduction of check valves 4, 5, 8, 10 and electromagnetic valves 7, 9, it is ensured that the pipeline system is in accordance with the liquid receiver 13, the subcooler 3 and the section. Flow valve 6 to work. A fan 2 and a fan 12 are arranged above the heat exchanger 1 of the outdoor processing unit and the heat exchanger 11 of the indoor air supply unit to carry out air delivery for heat transfer in the heat exchanger.

In summer cooling conditions, after the refrigerant passes through the compressor 14 and is connected to the four-way reversing valve 15 by the pipeline 18, it passes through the outdoor processing unit heat exchanger 1 (condenser at this time) according to the cooling direction of the arrow 16, and the system includes A one-way check valve 5 is closed, so the refrigerant can only pass through the other one-way valve 4, the liquid reservoir 13 is supercooled to the subcooler 3, and passes through the throttle valve 6, and cooperates with the solenoid valve 9 The opening and one-way valve 10 are connected with the indoor air supply unit heat exchanger 11 (the evaporator at this time), and finally the refrigerant pipeline passes through the four-way reversing valve 15 again and is connected to the compressor 14 to complete the entire refrigeration cycle process.

In winter heating conditions, after the refrigerant passes through the compressor 14 and is connected to the four-way reversing valve 15 by the pipeline 18, it follows the heating direction of the arrow 17 and passes through the heat exchanger 11 of the indoor air supply unit. At this time, one of the system The one-way valve 10 of the branch is closed, so the refrigerant can only pass through the one-way valve 8 that is conducted by another branch, the liquid reservoir 6 is supercooled to the subcooler 7, and passes through the throttle valve 6 and the solenoid valve 7. Open the one-way valve 5 and connect it with the heat exchanger 1 of the outdoor processing unit. Finally, the refrigerant pipeline passes through the four-way reversing valve 15 again and connects to the compressor 14 to complete the entire heating cycle.

In addition to being applicable to direct evaporative fresh air air handling units, the present invention can be widely applied to other heat pump air-cooled cold (hot) air vapor compression refrigeration cycles to meet users' needs for stable, high-efficiency, energy-saving refrigeration (heat), It is expected to produce huge social benefits.

Claims (1)

1. a big supercooling degree completely fresh wind air-treatment unit comprises compressor (14), four-way change-over valve (15), outdoor processing unit heat exchanger (1), reservoir (13), subcooler (3), expansion valve (6) and indoor blowing unit heat exchanger (11); It is characterized in that: described outdoor processing unit heat exchanger is made of two parallel condenser, and subcooler is positioned in the middle of two parallel condenser of outdoor processing unit heat exchanger; Described compressor is connected to outdoor processing unit heat exchanger and indoor blowing unit heat exchanger respectively through behind the four-way change-over valve; Outdoor processing unit heat exchanger is connected via reservoir, subcooler, choke valve and indoor blowing unit heat exchanger; Its refrigeration/thermal cycle is as follows:

Under the cooling condition, cold-producing medium process compressor is by extremely outdoor processing unit heat exchanger condensation of four-way change-over valve, enter reservoir then, cold excessively to subcooler again, and send into the heat exchange of indoor blowing unit heat exchanger by choke valve, last cold-producing medium is back to compressor once more by four-way change-over valve, finishes whole kind of refrigeration cycle process;

Under the heating condition, cold-producing medium process compressor is by extremely indoor blowing unit heat exchanger heat exchange of four-way change-over valve, enter reservoir then, cold excessively to subcooler again, processing unit heat exchanger outside the choke valve inlet chamber then, last cold-producing medium is back to compressor by four-way change-over valve once more, finishes the whole cyclic process that heats.

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