CN213984104U - Two-stage refrigeration system - Google Patents
Two-stage refrigeration system Download PDFInfo
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- CN213984104U CN213984104U CN202023023637.2U CN202023023637U CN213984104U CN 213984104 U CN213984104 U CN 213984104U CN 202023023637 U CN202023023637 U CN 202023023637U CN 213984104 U CN213984104 U CN 213984104U
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Abstract
A two-stage refrigeration system comprising: compressing a condensing unit; the first heat exchanger and the compression condensing unit form a first phase change cycle; the second heat exchanger, the pump and the second liquid storage device form a second phase change circulation with the first heat exchanger, and the second heat exchange side of the first heat exchanger, the second liquid storage device, the pump and the first heat exchange side of the second heat exchanger are sequentially connected in a circulation mode. The utility model discloses a second grade refrigerating system's design, can be at the evaporation temperature more than 15 ℃ of formation of second heat exchanger for under the operating mode of high temperature and high humidity, refrigerating system can not produce redundant dehumidification voluntarily, can prevent that air humidity from crossing low excessively, thereby avoids a large amount of humidification compensations, has reduced laboratory operation energy consumption, and the compression condensing unit still can work in normal operating pressure scope, thereby has improved the operational reliability of equipment.
Description
Technical Field
The utility model relates to a second grade refrigerating system.
Background
The one-level refrigerating system is adopted in the refrigerated system that current air conditioner laboratory provided, and the evaporating temperature of evaporimeter is often lower, generally below 15 ℃, because this temperature is far below the dew point temperature of air, refrigerating system can produce redundancy dehumidification to the air voluntarily, makes the air humidity in the laboratory hang down excessively, when the laboratory need test under the high humid operating mode, just need a large amount of electric humidification balanced operating mode, makes the laboratory operation energy consumption high live under.
SUMMERY OF THE UTILITY MODEL
According to an aspect of the utility model, a second grade refrigerating system is provided, include:
compressing a condensing unit;
the first heat exchanger and the compression condensing unit form a first phase change cycle;
the second heat exchanger, the pump and the second liquid storage device form a second phase change circulation with the first heat exchanger, and the second heat exchange side of the first heat exchanger, the second liquid storage device, the pump and the first heat exchange side of the second heat exchanger are sequentially connected in a circulation mode.
The utility model discloses a second grade refrigerating system's design, can be at the evaporation temperature more than 15 ℃ of formation of second heat exchanger for under the operating mode of high temperature and high humidity, refrigerating system can not produce redundant dehumidification voluntarily, can prevent that air humidity from crossing low excessively, thereby avoids a large amount of humidification compensations, has reduced laboratory operation energy consumption, and the compression condensing unit still can work in normal operating pressure scope, thereby has improved the operational reliability of equipment.
In some embodiments, the compression and condensation unit comprises a compressor, a condenser and an expansion valve, and the compressor, the condenser, the expansion valve and the first heat exchange side of the first heat exchanger are sequentially and circularly connected.
In some embodiments, the compression condensing unit further comprises a first control valve, a first reservoir, a first filter, a gas-liquid separator and an oil separator, wherein the condenser, the first filter, the first reservoir, the first control valve, the expansion valve, the first heat exchange side of the first heat exchanger, the gas-liquid separator, the compressor and the oil separator are sequentially and circularly connected.
In some embodiments, the frequency of the compressor is arranged to be varied in dependence on a reading of a humidity sensor provided at the second heat exchanging side of the second heat exchanger, thereby varying the humidity of the second heat exchanging side of the second heat exchanger.
In some embodiments, the second phase change cycle further comprises a second control valve in parallel with the second heat exchange side of the first heat exchanger.
In some embodiments, the opening degree of the second control valve is set to be changed according to a reading of a humidity sensor provided at the second heat exchanging side of the second heat exchanger, thereby changing the humidity of the second heat exchanging side of the second heat exchanger.
In some embodiments, the second phase change cycle further comprises a second filter disposed between the second reservoir and the pump.
In some embodiments, the rotational speed of the pump is arranged to vary in dependence on a reading of a temperature sensor provided at the second heat exchanging side of the second heat exchanger, thereby varying the temperature of the second heat exchanging side of the second heat exchanger.
Drawings
Fig. 1 is a schematic diagram of a two-stage refrigeration system according to some embodiments of the present invention;
figure 2 is a schematic view of an energy efficient enthalpy difference laboratory according to some embodiments of the present invention;
figure 3 is a schematic view of an energy efficient enthalpy difference test chamber according to further embodiments of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Figure 2 schematically illustrates an energy-efficient enthalpy difference laboratory according to some embodiments of the present invention, including a test room, an air handler, a secondary refrigeration system, and a test room temperature and humidity control system, the secondary refrigeration system also being usable in an application environment for temperature and humidity tests other than an air conditioning laboratory.
Referring to fig. 1, the two-stage refrigeration system includes a first phase change cycle consisting of a compression and condensation unit and a first heat exchange side of a first heat exchanger, and a second phase change cycle consisting of a second heat exchanger and other components. In the first phase change circulation, the first heat exchange side of the first heat exchanger is used as an evaporator, the evaporation temperature of the first heat exchanger is above 15 ℃, in the second phase change circulation, the second heat exchange side of the first heat exchanger is used as a condenser, the first heat exchange side of the second heat exchanger is used as an evaporator, the evaporation temperature of the second heat exchanger can reach above 15 ℃, high sensible heat refrigeration under most high-temperature and high-humidity working conditions can be realized, and the second heat exchange side of the second heat exchanger adopts an air processor to exchange heat with air in a test room, so that the air temperature in the test room is adjusted. When the air temperature reaches above 15 ℃, the refrigeration system can not spontaneously generate a dehumidification effect, and can prevent the air humidity from being too low.
In some embodiments, the loop of the second phase change cycle and the test room temperature and humidity control system may be provided in multiple sets, which are connected in parallel to each other, to regulate the temperature and humidity between different tests. Specifically, referring to fig. 3, the test booth includes an indoor test booth for simulating an indoor environment of the air conditioner, and an outdoor test booth for simulating an outdoor environment of the air conditioner. The first heat exchanger comprises two first heat exchanger modules which are connected in series, the number of the second phase change circulations is two, each group of the second phase change circulations is respectively connected with each first heat exchanger module, and the second heat exchange side of each group of the second heat exchangers of the second phase change circulations carries out heat exchange with air in an indoor test room and an outdoor test room through an air processor. The indoor test room and the outdoor test room are respectively provided with an air processor and a test room temperature and humidity control system.
The compression condensing unit comprises a condenser, a first filter 11, a first liquid storage 12, a first control valve 13, an expansion valve 14, a gas-liquid separator 15, a compressor 16 and an oil separator 17. In the first phase change cycle, the condenser, the first filter 11, the first accumulator 12, the first control valve 13, the expansion valve 14, the first heat exchange side of the first heat exchanger, the gas-liquid separator 15, the compressor 16, and the oil separator 17 are sequentially connected in a circulating manner, and refrigeration is realized by phase change of the refrigerant. The first control valve 13 may be a throttle valve to control the flow rate of the refrigerant. The compressor 16 may be an inverter compressor 16. In other embodiments, other forms of compression and condensation units may be used to achieve refrigeration. The compression condensing unit is a variable-capacity compression condensing unit, the medium pressure of the second phase change cycle can be realized by adjusting the capacity of the compression condensing unit, for example, by changing the frequency of the compressor or by bypassing hot gas, and the target medium pressure setting of the second phase change cycle is related to the humidity of the second heat exchange side of the second heat exchanger, that is, the frequency of the compressor can be set to be changed according to the reading of a humidity sensor arranged at the second heat exchange side of the second heat exchanger, so as to change the humidity of the second heat exchange side of the second heat exchanger.
The second phase change cycle comprises a second heat exchange side of the first heat exchanger, a second reservoir 23, a second filter 22, a pump 24, a first heat exchange side of the second heat exchanger and a second control valve 21, wherein the second heat exchange side of the second heat exchanger, the second reservoir 23, the second filter 22, the pump 24 and the first heat exchange side of the second heat exchanger are sequentially connected in a circulating manner, the second control valve 21 is connected in parallel with the second heat exchange side of the first heat exchanger, specifically, the first end of the second control valve 21 is arranged between the second heat exchange side of the first heat exchanger and the first heat exchange side of the second heat exchanger, and the second end of the second control valve is arranged between the second reservoir 23 and the second heat exchange side of the first heat exchanger. The second phase change cycle raises the temperature of the first heat exchange side of the second heat exchanger to above 15 ℃ through phase change of the refrigerant. Wherein the second control valve 21 can adopt a throttle valve, and the evaporation temperature of the second heat exchanger is changed through the adjustment of the opening degree of the second control valve 21, so as to change the humidity of the second heat exchanging side of the second heat exchanger, i.e. the opening degree of the second control valve 21 is set to be changed according to the reading of a humidity sensor arranged at the second heat exchanging side of the second heat exchanger.
The test room temperature and humidity control system comprises a temperature control system and a humidity control system.
The humidity control system includes a humidity sensor, a first PID controller, and a humidifier. The humidity sensor is arranged on a second heat exchange side of the second heat exchanger, namely at the air handler or in the test room, and is used for detecting the humidity of the test room.
The humidifier may be an ultrasonic humidifier that adjusts humidity based on readings from a humidity sensor. Compared with the traditional electrically heated steam humidifier, the energy-saving enthalpy difference test chamber has the advantages that the additional heat cannot be introduced into the test chamber, and the additional heat is balanced, so that the energy consumption of the test chamber in operation is reduced. Preferably, the ultrasonic humidifier includes an ultrasonic fogging unit and a contactless switching element for controlling the ultrasonic fogging unit, and the contactless switching element controls a control period of the ultrasonic fogging unit to be 5s or less, so that accurate humidity adjustment can be achieved in an energy-saving enthalpy difference test room. The contactless switch element is specifically a solid-state relay, an IGBT module, a silicon controlled module, a diode module, a flat silicon module or a rectifier bridge, and the solid-state relay is adopted in the embodiment.
Specifically, the first PID controller is used for controlling the humidifier through the solid state relay according to the reading of the humidity sensor. The first PID controller is also used to control one of the opening of the second control valve 21 or the frequency of the compressor 16 based on the reading of the humidity sensor to adjust the humidity.
The temperature control system comprises a temperature sensor, a second PID controller, a heater, a thyristor and a frequency converter. The temperature sensor is arranged on the second heat exchange side of the second heat exchanger, namely at the air handler or in the test room, and is used for detecting the temperature of the test room. The heater is located in the laboratory and is used to heat the laboratory air based on the readings from the temperature sensor. In particular, the second PID controller is used to control the heater by means of a thyristor, according to the reading of the temperature sensor.
The rotational speed of the pump 24 is set to be changed according to the reading of the temperature sensor, thereby changing the refrigerant circulation flow rate in the second phase change cycle and further changing the temperature of the second heat exchange side of the second heat exchanger. In particular, the second PID controller is also used to control the speed of the pump 24 by means of a frequency converter, according to the reading of the temperature sensor.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, or the above technical solutions can be freely combined, including the technical features between the above different embodiments, which all belong to the protection scope of the present invention.
Claims (8)
1. A two-stage refrigeration system, comprising:
compressing a condensing unit;
the first heat exchanger and the compression condensing unit form a first phase change cycle;
the second heat exchanger, the pump and the second reservoir form a second phase change circulation with the first heat exchanger, and the second heat exchange side of the first heat exchanger, the second reservoir, the pump and the first heat exchange side of the second heat exchanger are sequentially connected in a circulation mode.
2. The two-stage refrigeration system of claim 1, wherein the compression and condensation unit comprises a compressor, a condenser and an expansion valve, and the compressor, the condenser, the expansion valve and the first heat exchange side of the first heat exchanger are sequentially connected in a circulating manner.
3. The two-stage refrigeration system according to claim 2, wherein the compression and condensation unit further comprises a first control valve, a first reservoir, a first filter, a gas-liquid separator and an oil separator, and the condenser, the first filter, the first reservoir, the first control valve, the expansion valve, the first heat exchange side of the first heat exchanger, the gas-liquid separator, the compressor and the oil separator are sequentially and circularly connected.
4. The two-stage refrigeration system of claim 2, wherein the frequency of the compressor is configured to vary based on a reading of a humidity sensor disposed on the second heat exchange side of the second heat exchanger to vary the humidity of the second heat exchange side of the second heat exchanger.
5. The two-stage refrigeration system of any of claims 1 to 4, wherein the second phase change cycle further comprises a second control valve in parallel with the second heat exchange side of the first heat exchanger.
6. The two-stage refrigeration system of claim 5, wherein the opening of the second control valve is configured to vary based on a reading from a humidity sensor disposed on a second heat exchange side of the second heat exchanger to vary the humidity of the second heat exchange side of the second heat exchanger.
7. The two-stage refrigeration system of claim 5, wherein the second phase change cycle further comprises a second filter disposed between the second accumulator and the pump.
8. A two-stage refrigeration system according to any one of claims 1 to 4, wherein the speed of rotation of the pump is arranged to vary in dependence on a reading from a temperature sensor provided in the second heat exchange side of the second heat exchanger, thereby to vary the temperature of the second heat exchange side of the second heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023023637.2U CN213984104U (en) | 2020-12-14 | 2020-12-14 | Two-stage refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023023637.2U CN213984104U (en) | 2020-12-14 | 2020-12-14 | Two-stage refrigeration system |
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| CN213984104U true CN213984104U (en) | 2021-08-17 |
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| CN202023023637.2U Active CN213984104U (en) | 2020-12-14 | 2020-12-14 | Two-stage refrigeration system |
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