CN111896284B - Performance test system for double-refrigeration-cycle reverse coupling heat exchanger - Google Patents

Abstract

A dual refrigeration cycle reverse coupling heat exchanger performance test system includes a condenser test cycle, an evaporator test cycle, a first test air duct system and a second test air duct system, wherein the condenser test cycle includes a condenser test main test refrigeration cycle and a condenser test adjustment metering refrigeration cycle with opposite circulation directions and reverse coupling, and the evaporator test cycle includes an evaporator test main test refrigeration cycle and an evaporator test adjustment metering refrigeration cycle with opposite circulation directions and reverse coupling. The present invention can conveniently, efficiently, accurately and energy-savingly test the thermal performance of various types of heat exchangers in a comprehensive test system, and overcomes the shortcomings of existing similar phase change heat exchanger test systems that cannot directly measure the heat load of the circulating working fluid in the phase change section, have a single function, a long adjustment time, and have serious energy waste.

Description

A dual refrigeration cycle reverse coupling heat exchanger performance test system

Technical Field

The invention relates to a testing system, in particular to a dual refrigeration cycle reverse coupling heat exchanger performance testing system.

Background Art

Heat exchangers are important energy-consuming equipment, energy conversion equipment, and energy transportation equipment in modern industry. They play an important role in many industrial fields. In industry, the structure and area of heat exchangers often need to be specifically constructed according to actual needs, so the thermal performance of the constructed heat exchangers needs to be tested. The existing heat exchanger test system based on refrigeration cycle has one or more of the following shortcomings: single function, narrow operating range, slow adjustment process, serious energy waste in the experimental process, and phase change heat transfer test heavily relies on the non-phase change side for heat load calculation.

Therefore, it is of great significance to build a convenient, efficient, accurate and energy-saving comprehensive testing system that can test the thermal performance of various types of heat exchangers. The above is an important problem that technical personnel in this field need to solve.

Summary of the invention

The purpose of the present invention is to provide a dual refrigeration cycle reverse coupled heat exchanger performance test system with optimized structure, precise testing, rapid adjustment and energy saving. The heat exchanger performance test system can effectively improve the structure of the existing heat exchanger test system and enhance the overall energy utilization of the system.

A dual refrigeration cycle reverse coupling heat exchanger performance test system designed for this purpose includes a condenser test cycle, an evaporator test cycle, a first test air duct system and a second test air duct system, characterized in that: the condenser test cycle includes a condenser test main test refrigeration cycle and a condenser test regulating and metering refrigeration cycle with opposite circulation directions and reverse coupling, and the evaporator test cycle includes an evaporator test main test refrigeration cycle and an evaporator test regulating and metering refrigeration cycle with opposite circulation directions and reverse coupling; the condenser test main test refrigeration cycle and the evaporator test main test refrigeration cycle perform rapid and arbitrary adjustment of the test section inlet state by dryness adjustment, and the condenser test regulating and metering refrigeration cycle and the evaporator test regulating and metering refrigeration cycle are provided with a plurality of gas-liquid separators before and after the test section, and the flow rate, temperature, pressure, dryness and related physical properties of the single-phase working fluid before and after the test section are obtained by separation, so as to accurately calculate the heat load of the test section; this test system can simultaneously perform condenser performance test and evaporator performance test by constructing two coupled refrigeration cycles with opposite circulation directions.

The main test refrigeration cycle of the condenser test includes a first compressor, a first regulating heat exchanger, a first gas-liquid separator, a first condenser, a second evaporator and a second gas-liquid separator connected in sequence, the second gas-liquid separator is connected to the first compressor, and the first gas-liquid separator is connected to the first condenser through a first gas phase branch and a first liquid phase branch respectively; the condenser test regulating and metering refrigeration cycle includes a second compressor, a second condenser, a third gas-liquid separator, a first evaporator, a fourth gas-liquid separator and a fifth gas-liquid separator connected in sequence, and the fifth gas-liquid separator is connected to the second compressor; the refrigerant flow and state at the inlet of the first condenser to be tested are accurately adjusted through cooling adjustment by the first regulating heat exchanger and dryness adjustment of the first gas phase branch and the first liquid phase branch at the outlet of the first gas-liquid separator.

The main test refrigeration cycle of the evaporator test includes a first compressor, a first condenser, a second regulating heat exchanger, a sixth gas-liquid separator, a second evaporator and a second gas-liquid separator which are connected in sequence, the second gas-liquid separator is connected to the first compressor, and the sixth gas-liquid separator is connected to the second evaporator through the second gas phase branch and the second liquid phase branch respectively; the evaporator test regulating metering refrigeration cycle includes a second compressor, a second condenser, a seventh gas-liquid separator, a first evaporator and a fourth gas-liquid separator which are connected in sequence, the fourth gas-liquid separator is connected to the second compressor, and the seventh gas-liquid separator is connected to the first evaporator through the third gas phase branch and the third liquid phase branch respectively; the dryness adjustment of the second gas phase branch and the second liquid phase branch at the outlet of the sixth gas-liquid separator is used to accurately adjust the refrigerant flow and state at the inlet of the second evaporator to be tested.

The first condenser and the first evaporator are arranged in the first test air duct system, and the second condenser and the second evaporator are arranged in the second test air duct system.

In the condenser test cycle, the first gas phase branch includes a first gas phase opening valve and a first gas phase flowmeter, the upper port of the first gas-liquid separator, the first gas phase opening valve, the first gas phase flowmeter and the first condenser are connected in sequence, and the first liquid phase branch includes a first liquid phase opening valve and a first liquid phase flowmeter, the lower port of the first gas-liquid separator, the first liquid phase opening valve, the first liquid phase flowmeter and the first condenser are connected in sequence.

In the condenser test cycle, the first condenser is connected to the second evaporator through a first throttling valve.

In the condenser test cycle, the second condenser is connected to the third gas-liquid separator through the second throttling opening valve, the upper port of the third gas-liquid separator is connected to the upper port of the fifth gas-liquid separator, and the lower port of the third gas-liquid separator is divided into two paths, one of which is connected to the first regulating heat exchanger through the third throttling opening valve, and the other is connected to the first evaporator. The first regulating heat exchanger is provided with saturated liquid phase cooling medium by the third gas-liquid separator after the second throttling opening valve in the condenser test regulating and metering refrigeration cycle, and adjusts the outlet working medium temperature of the first compressor of the main test refrigeration cycle of the condenser test.

In the condenser test cycle, the upper port of the fourth gas-liquid separator is connected to the upper port of the fifth gas-liquid separator through the second gas phase flowmeter, and the first regulating heat exchanger is connected to the upper port of the fifth gas-liquid separator.

The heat load calculation of the condenser performance test section is that the third gas-liquid separator in the condenser test adjustment and metering refrigeration cycle provides a saturated liquid phase cooling medium, and the first evaporator and the first condenser under test undergo a full saturated phase change heat transfer, that is, the outlet of the first evaporator is a two-phase medium, and the fourth gas-liquid separator performs gas-liquid separation. The gas phase flow at the outlet of the fourth gas-liquid separator is measured by the second gas phase flowmeter, and the heat load of the test section is calculated based on the latent heat of the gas-liquid phase change of the medium.

The heat load calculation of the first condenser under test is based on the condenser test regulation metering refrigeration cycle according to the following formula:

Q _C = h _lv × m _r

Among them, _Qc is the heat load of the measured condenser, W; _hlv is the latent heat of phase change of the evaporator working fluid in the regulating and metering refrigeration cycle, KJ﹒ kg ^-1 ; _mr is the mass flow rate of the evaporator liquid working fluid evaporating into the gas phase in the regulating and metering refrigeration cycle, kg﹒ s ^-1 .

In the evaporator test cycle, the first condenser is connected to the second regulating heat exchanger through the first throttling valve.

In the evaporator test cycle, the second gas phase branch includes a second gas phase opening valve and a third gas phase flowmeter, the upper port of the sixth gas-liquid separator, the second gas phase opening valve, the third gas phase flowmeter and the second condenser are connected in sequence, and the second liquid phase branch includes a second liquid phase opening valve and a second liquid phase flowmeter, and the lower port of the sixth gas-liquid separator, the second liquid phase opening valve, the second liquid phase flowmeter and the second condenser are connected in sequence.

In the evaporator test cycle, the third gas phase branch includes a fourth gas phase flow meter and a second regulating heat exchanger, the upper port of the seventh gas-liquid separator, the fourth gas phase flow meter and the second regulating heat exchanger are connected in sequence, the second regulating heat exchanger is connected to the first evaporator through a second throttling opening valve, and the third liquid phase branch includes a third liquid phase flow meter, the lower port of the seventh gas-liquid separator is connected to the third liquid phase flow meter, and the third liquid phase flow meter is connected to the first evaporator through a second throttling opening valve. The second regulating heat exchanger is a low-temperature working fluid obtained after the first throttling opening valve in the main test refrigeration cycle of the evaporator test, which completely cools the uncondensed gas phase working fluid of the second condenser in the evaporator test regulating metering refrigeration cycle, so that the inlet of the second throttling opening valve is a full liquid phase working fluid, thereby improving the thermal efficiency of the test cycle.

In the evaporator test cycle, the upper port of the fourth gas-liquid separator is connected to the second compressor through the second gas phase flow meter.

The heat load calculation of the evaporator performance test section is based on the gas phase working fluid enthalpy value obtained at the inlet of the second condenser and the working fluid enthalpy value obtained at the outlet of the second condenser in the evaporator test adjustment metering refrigeration cycle, the gas and liquid flow rates obtained by the seventh gas-liquid separator Ⅶ, the third liquid flowmeter, and the fourth gas flowmeter, and the comprehensive calculation of the working fluid gas phase relative heat capacity, liquid phase relative heat capacity and gas-liquid phase change latent heat to obtain the heat load of the test section.

The heat load calculation of the second evaporator under test is based on the evaporator test regulation metering refrigeration cycle according to the following formula:

Q _e =C _v ×(T _in -T _sat )×(m _r,v +m _r,l )+h _lv ×m _r,l +C _l ×(T _sat -T _out,l )×m _{r, l}

Wherein, _Qe is the heat load of the second evaporator (16), W; _Cv and _Cl are the specific heat capacity of the superheated gas phase working medium and the specific heat capacity of the subcooled liquid phase working medium in the condenser, J/(kg﹒K); _Tin , _Tsat and _Tout,l are the condenser inlet temperature, the condenser saturation temperature and the outlet temperature of the liquid phase branch of the gas-liquid separator VII, K; _mr,v and _mr,l are the mass flow rate of the working medium at the outlet of the liquid phase branch of the gas-liquid separator VII and the mass flow rate of the working medium at the outlet of the gas phase branch of the gas-liquid separator VII, kg﹒s ^-1 ; _hlv is the latent heat of phase change of the working medium in the evaporator in the regulating and metering refrigeration cycle, KJ﹒kg ^-1 .

The first test air duct system includes a fan, a first flow equalizer and a second flow equalizer, and the first flow equalizer and the second flow equalizer are respectively arranged on the windward front and rear sides of the first condenser; the second test air duct system includes a fan, a third flow equalizer and a fourth flow equalizer, and the third flow equalizer and the fourth flow equalizer are respectively arranged on the windward front and rear sides of the second evaporator; the first test air duct system and the second test air duct system are both provided with physical parameter measuring instruments, and the heat load of the test section can be verified by calculating the air heat exchange amount in the air duct.

The heat load of the test section is calculated using the air duct according to the following formula:

Q _C =C _p,a ×m _a ×(T _a,o -T _a,i )

Q _e =C _p,a ×m _a ×(T _a,i -T _a,o )

Wherein, _Qc and _Qe are the heat loads of the tested condenser and evaporator respectively, W; _Cp,a is the specific heat capacity of air, J/(kg﹒K); ma _is the air mass flow rate in the air duct, kg﹒s ^-1 ; Ta _,i and _Ta,o are the air temperatures at the inlet and outlet of the tested condenser or evaporator respectively, K.

The heat exchanger performance test system of the present invention constructs two coupled refrigeration cycles with opposite circulation directions. The main test refrigeration cycle adopts a new method of gas-liquid separation and dryness adjustment to perform performance tests on the evaporator and condenser. The regulating and metering refrigeration cycle adopts gas-liquid separation to accurately measure the phase flow rate. The latent heat of gas-liquid phase conversion and the specific heat capacity characteristics of the working fluid are utilized to couple with the main test refrigeration cycle to construct a multifunctional heat exchanger test system with a simple structure and accurate adjustment and measurement. This heat exchanger performance test system overcomes the shortcomings of the existing heat exchanger test system based on refrigeration cycle, such as single function, long adjustment time, narrow operating condition range, and serious energy waste in the experimental process. Compared with the prior art, this heat exchanger performance test system can conveniently, efficiently, accurately and energy-savingly perform accurate test experiments on the thermal performance of various types of heat exchangers in a comprehensive test system, thereby expanding the test operating condition range.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the structure of a heat exchanger performance testing system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the structure of a condenser test cycle in one embodiment of the present invention.

FIG. 3 is a schematic diagram of the structure of an evaporator test cycle in one embodiment of the present invention.

DETAILED DESCRIPTION

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

Referring to Fig. 1-Fig. 3, the dual refrigeration cycle reverse coupling heat exchanger performance test system includes a condenser test cycle A, an evaporator test cycle B, a first test air duct system 3 and a second test air duct system 4, wherein the condenser test cycle A includes a condenser test main test refrigeration cycle a and a condenser test regulating and metering refrigeration cycle b with opposite circulation directions and reverse coupling, and the evaporator test cycle B includes an evaporator test main test refrigeration cycle c and an evaporator test regulating and metering refrigeration cycle d with opposite circulation directions and reverse coupling;

The main test refrigeration cycle a of the condenser test includes the first compressor 11, the first regulating heat exchanger 27, the first gas-liquid separator 121, the first condenser 15, the second evaporator 16 and the second gas-liquid separator 122 which are connected in sequence, the second gas-liquid separator 122 is connected to the first compressor 11, and the first gas-liquid separator 121 is connected to the first condenser 15 through the first gas phase branch and the first liquid phase branch respectively; the condenser test regulating metering refrigeration cycle b includes the second compressor 21, the second condenser 26, the third gas-liquid separator 223, the first evaporator 25, the fourth gas-liquid separator 222 and the fifth gas-liquid separator 221 which are connected in sequence, and the fifth gas-liquid separator 221 is connected to the second compressor 21;

The main test refrigeration cycle c of the evaporator test includes a first compressor 11, a first condenser 15, a second regulating heat exchanger 17, a sixth gas-liquid separator 123, a second evaporator 16 and a second gas-liquid separator 122 connected in sequence, the second gas-liquid separator 122 is connected to the first compressor 11, and the sixth gas-liquid separator 123 is connected to the second evaporator 16 through a second gas phase branch and a second liquid phase branch respectively; the evaporator test regulating metering refrigeration cycle d includes a second compressor 21, a second condenser 26, a seventh gas-liquid separator 224, a first evaporator 25 and a fourth gas-liquid separator 222 connected in sequence, the fourth gas-liquid separator 222 is connected to the second compressor 21, and the seventh gas-liquid separator 224 is connected to the first evaporator 25 through a third gas phase branch and a third liquid phase branch respectively;

The first condenser 15 and the first evaporator 25 are disposed in the first test air duct system 3 , and the second condenser 26 and the second evaporator 16 are disposed in the second test air duct system 4 .

In the condenser test cycle A, the first gas phase branch includes a first gas phase opening valve 131 and a first gas phase flowmeter 141, and the upper port of the first gas-liquid separator 121, the first gas phase opening valve 131, the first gas phase flowmeter 141 and the first condenser 15 are connected in sequence, and the first liquid phase branch includes a first liquid phase opening valve 132 and a first liquid phase flowmeter 142, and the lower port of the first gas-liquid separator 121, the first liquid phase opening valve 132, the first liquid phase flowmeter 142 and the first condenser 15 are connected in sequence.

In the condenser test cycle A, the first condenser 15 is connected to the second evaporator 16 via the first throttle opening valve 133 .

In the condenser test cycle A, the second condenser 26 is connected to the third gas-liquid separator 223 through the second throttling opening valve 231, the upper port of the third gas-liquid separator 223 is connected to the upper port of the fifth gas-liquid separator 221, and the lower port of the third gas-liquid separator 223 is divided into two paths, one path is connected to the first regulating heat exchanger 27 through the third throttling opening valve 232, and the other path is connected to the first evaporator 25.

In the condenser test cycle A, the upper port of the fourth gas-liquid separator 222 is connected to the upper port of the fifth gas-liquid separator 221 through the second gas phase flowmeter 241 , and the first regulating heat exchanger 27 is connected to the upper port of the fifth gas-liquid separator 221 .

In the evaporator test cycle B, the first condenser 15 is connected to the second regulating heat exchanger 17 via the first throttle opening valve 133 .

In the evaporator test cycle B, the second gas phase branch includes a second gas phase opening valve 134 and a third gas phase flowmeter 143, the upper port of the sixth gas-liquid separator 123, the second gas phase opening valve 134, the third gas phase flowmeter 143 and the second condenser 16 are connected in sequence, and the second liquid phase branch includes a second liquid phase opening valve 135 and a second liquid phase flowmeter 144, the lower port of the sixth gas-liquid separator 123, the second liquid phase opening valve 135, the second liquid phase flowmeter 144 and the second condenser 16 are connected in sequence.

In the evaporator test cycle B, the third gas phase branch includes the fourth gas phase flowmeter 243 and the second regulating heat exchanger 17, the upper port of the seventh gas-liquid separator 224, the fourth gas phase flowmeter 243 and the second regulating heat exchanger 17 are connected in sequence, the second regulating heat exchanger 17 is connected to the first evaporator 25 through the second throttling opening valve 231, the third liquid phase branch includes the third liquid phase flowmeter 242, the lower port of the seventh gas-liquid separator 224 is connected to the third liquid phase flowmeter 242, and the third liquid phase flowmeter 242 is connected to the first evaporator 25 through the second throttling opening valve 231.

In the evaporator test cycle B, the upper port of the fourth gas-liquid separator 222 is connected to the second compressor 21 through the second gas phase flowmeter 241 .

The first test air duct system 3 includes a fan, a first flow equalizer 31 and a second flow equalizer 32, and the first flow equalizer 31 and the second flow equalizer 32 are respectively arranged on the windward front and rear sides of the first condenser 15. The second test air duct system 4 includes a fan, a third flow equalizer 41 and a fourth flow equalizer 42, and the third flow equalizer 41 and the fourth flow equalizer 42 are respectively arranged on the windward front and rear sides of the second evaporator 16. Physical parameter measuring instruments are both provided in the first test air duct system 3 and the second test air duct system 4.

Working principle of this dual refrigeration cycle reverse coupling heat exchanger performance test system:

Condenser Test Cycle

The working principle of the main test refrigeration cycle a of the condenser test is as follows: after the high-temperature gaseous refrigerant is discharged from the first compressor 11, it enters the first regulating heat exchanger 27 for cooling and regulation, and exchanges heat with the low-temperature liquid refrigerant after throttling and expansion of the condenser test regulating and metering refrigeration cycle b. At this time, the refrigerant on the main test side can be adjusted to a set superheated state or a two-phase state. When adjusted to a two-phase state, after entering the first gas-liquid separator 121, the saturated gas phase flow rate is accurately controlled by the first gas phase opening valve 131 and the first gas phase flowmeter 141 of the first gas phase branch, and the saturated liquid phase flow rate is accurately controlled by the first liquid phase opening valve 132 and the first liquid phase flowmeter 142 of the first liquid phase branch. Then, it is accurately adjusted according to the inlet dryness requirement of the first condenser 15 to be tested, and then the adjusted two-phase refrigerant enters the first condenser (15) to be tested for heat exchange, and then passes through the first throttling opening valve 133, the second evaporator 16 and the second gas-liquid separator 122 in sequence to complete the cycle.

The working principle of the condenser test regulating and metering refrigeration cycle b is as follows: after the second compressor 21 discharges the gaseous refrigerant, it passes through the second condenser 26 for condensation, and then is throttled by the second throttling opening valve 231. After throttling, the two-phase refrigerant enters the third gas-liquid separator 223, and all the gaseous refrigerant therein is discharged from the upper end outlet of the third gas-liquid separator 223 to the fifth gas-liquid separator 221, and part of the liquid refrigerant in the third gas-liquid separator 223 is transported from the lower end outlet to the first regulating heat exchanger 27 to regulate the state of the refrigerant in the condenser test main test refrigeration cycle a, and the remaining saturated liquid refrigerant with excess flow enters the first evaporator 25 and the condenser test main test refrigeration cycle a. The first condenser 15 to be tested is used for heat exchange, and then the saturated two-phase refrigerant with excess flow (i.e., the refrigerant at the outlet of the first evaporator 25 is still in a two-phase state) enters the fourth gas-liquid separator 222 for gas-liquid separation, and then the gas-phase refrigerant is discharged from the upper end of the fourth gas-liquid separator 222, and the real-time flow is calibrated by the second gas-phase flowmeter 241. Since only the saturated liquid-phase refrigerant enters the first evaporator 25, the heat exchange in the first evaporator 25 is only the evaporation and gasification of the refrigerant. Therefore, the heat absorbed by the refrigerant converted from the liquid phase to the gas phase in the first evaporator 25 is the absorbed heat of the first evaporator 25, which is also equal to the heat released by the first condenser 15 to be tested. The heat load is calculated as:

Q _C = h _lv × m _r

Among them, _Qc is the heat load of the measured condenser, W; _hlv is the latent heat of phase change of the evaporator working fluid in the regulating and metering refrigeration cycle, KJ﹒ kg ^-1 ; _mr is the mass flow rate of the evaporator liquid working fluid evaporating into the gas phase in the regulating and metering refrigeration cycle, kg﹒ s ^-1 .

Evaporator test cycle

The working principle of the main test refrigeration cycle c of the evaporator test is as follows: After the high-temperature gaseous refrigerant is discharged from the first compressor 11, it enters the first condenser 15 for heat exchange, and is then throttled by the first throttling valve 133. The throttled two-phase refrigerant enters the second regulating heat exchanger 17 to cool and liquefy the uncondensed working fluid of the second condenser 26 of the evaporator test regulating and metering refrigeration cycle d. At this time, the refrigerant on the main test side is in a two-phase state, and then enters the sixth gas-liquid separator 123 for gas-liquid separation. The sixth gas-liquid separator The outlet 123 is divided into a second gas phase branch and a second liquid phase branch, wherein the second gas phase opening valve 134 and the third gas phase flowmeter 143 of the second gas phase branch accurately control the saturated gas phase flow, and the second liquid phase opening valve 135 and the second liquid phase flowmeter 144 of the second liquid phase branch accurately control the saturated liquid phase flow, and then accurately adjusted according to the inlet dryness requirement of the measured second evaporator 16, and then the adjusted two-phase refrigerant enters the measured second evaporator 16 for heat exchange, and then enters the second gas-liquid separator 122 to complete the cycle.

The working principle of the evaporator test regulating and metering refrigeration cycle d is as follows: after the second compressor 21 discharges the gaseous refrigerant, it passes through the second condenser 26 and exchanges heat with the second evaporator 16 under test of the evaporator test main test refrigeration cycle c, and then enters the seventh gas-liquid separator 224 for gas-liquid separation, wherein the liquid refrigerant enters the third liquid branch at the lower end outlet of the seventh gas-liquid separator 224, and the flow rate is measured by the third liquid flowmeter 242, and the gaseous refrigerant enters the third gas branch at the upper end outlet of the seventh gas-liquid separator 224, and the flow rate is measured by the fourth gas flowmeter 243. At the same time, the gaseous refrigerant that has not yet condensed in the fourth gas branch is cooled and liquefied by the second regulating heat exchanger 17, and enters the second throttling opening valve 231 for throttling. The throttled refrigerant enters the first evaporator 25 for heat exchange and then enters the fourth gas-liquid separator 222 for gas-liquid separation, and then the gas-phase refrigerant returns to the second compressor 21 to complete the cycle. The heat exchange capacity of the second evaporator 16 to be measured can be calculated by measuring the refrigerant flow and physical parameters of the gas and liquid phases at the inlet and outlet of the second condenser 26:

Q _e =C _v ×(T _in -T _sat )×(m _r,v +m _r,l )+h _lv ×m _r,l +C _l ×(T _sat -T _out,l )×m _{r, l}

Wherein, Qe _is the heat load of the evaporator under test, W; _Cv and _Cl are the specific heat capacity of the superheated gas phase working medium and the subcooled liquid phase working medium in the condenser, J/(kg﹒K); _Tin , _Tsat and _Tout,l are the condenser inlet temperature, condenser saturation temperature and gas-liquid separator VII liquid phase branch outlet temperature, K; _mr,v and _mr,l are the working medium mass flow rate of the gas-liquid separator VII liquid phase branch outlet and the working medium mass flow rate of the gas-liquid separator VII gas phase branch outlet, kg﹒s ^-1 ; _hlv is the latent heat of phase change of the evaporator working medium in the regulating and metering refrigeration cycle, KJ﹒kg ^-1 .

In addition, the first test air duct system 3 and the second test air duct system 4 in the dual refrigeration cycle reverse coupling heat exchanger performance test system can calculate the heat load of the test section by calculating the heat exchange amount of the air in the air duct:

Q _C =C _p,a ×m _a ×(T _a,o -T _a,i )

Q _e =C _p,a ×m _a ×(T _a,i -T _a,o )

Wherein, _Qc and _Qe are the heat loads of the tested condenser and evaporator respectively, W; _Cp,a is the specific heat capacity of air, J/(kg﹒K); ma _is the air mass flow rate in the air duct, kg﹒s ^-1 ; Ta _,i and _Ta,o are the air temperatures at the inlet and outlet of the tested condenser or evaporator respectively, K.

The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (8)

1. The utility model provides a two refrigeration cycle reverse coupling heat exchanger performance test system, includes condenser test cycle (A), evaporimeter test cycle (B), first test air duct system (3) and second test air duct system (4), its characterized in that: the condenser test cycle (A) comprises a condenser test main test refrigeration cycle (a) and a condenser test regulation metering refrigeration cycle (B) which are opposite in circulation direction and are reversely coupled, and the evaporator test cycle (B) comprises an evaporator test main test refrigeration cycle (c) and an evaporator test regulation metering refrigeration cycle (d) which are opposite in circulation direction and are reversely coupled;

The condenser test main test refrigeration cycle (a) comprises a first compressor (11), a first regulating heat exchanger (27), a first gas-liquid separator (121), a first condenser (15), a second evaporator (16) and a second gas-liquid separator (122) which are sequentially connected, wherein the second gas-liquid separator (122) is connected with the first compressor (11), and the first gas-liquid separator (121) is connected with the first condenser (15) through a first gas phase branch and a first liquid phase branch respectively; the condenser test adjustment metering refrigeration cycle (b) comprises a second compressor (21), a second condenser (26), a third gas-liquid separator (223), a first evaporator (25), a fourth gas-liquid separator (222) and a fifth gas-liquid separator (221) which are sequentially connected, wherein the fifth gas-liquid separator (221) is connected with the second compressor (21);

The evaporator test main test refrigeration cycle (c) comprises a first compressor (11), a first condenser (15), a second regulating heat exchanger (17), a sixth gas-liquid separator (123), a second evaporator (16) and a second gas-liquid separator (122) which are sequentially connected, wherein the second gas-liquid separator (122) is connected with the first compressor (11), and the sixth gas-liquid separator (123) is connected with the second evaporator (16) through a second gas phase branch and a second liquid phase branch respectively; the evaporator test adjustment metering refrigeration cycle (d) comprises a second compressor (21), a second condenser (26), a seventh gas-liquid separator (224), a first evaporator (25) and a fourth gas-liquid separator (222) which are sequentially connected, wherein the fourth gas-liquid separator (222) is connected with the second compressor (21), and the seventh gas-liquid separator (224) is connected with the first evaporator (25) through a third gas phase branch and a third liquid phase branch respectively;

The first condenser (15) and the first evaporator (25) are arranged in the first test air duct system (3), and the second condenser (26) and the second evaporator (16) are arranged in the second test air duct system (4);

The measured heat load calculation of the first condenser (15) adjusts the metered refrigeration cycle based on the condenser test according to the following formula:

Q_C＝h_lv×m_r

Wherein Q _c is the heat load of the condenser to be tested, W; h _lv is the phase change latent heat of the evaporator working medium in the metering refrigeration cycle, KJ is Kg ^-1;m_r is the mass flow rate of the liquid phase working medium of the evaporator in the metering refrigeration cycle, which is evaporated into a gas phase, kg is ^-1;

The measured heat load calculation for the second evaporator (16) adjusts the metered refrigeration cycle based on the evaporator test, according to the following equation:

Q_e＝C_v×(T_in-T_sat)×(m_r,v+m_r,l)+h_lv×m_r,l+C_l×(T_sat-T_out,l)×m_r,l

Wherein Q _e is the heat load of the second evaporator (16), W; c _v、C_l is the specific heat capacity of the overheated gas-phase working medium and the specific heat capacity of the supercooled liquid-phase working medium in the condenser, J/(kg & K); t _in、T_sat、T_out,l is the inlet temperature of the condenser, the saturation temperature of the condenser and the outlet temperature of the liquid phase branch of the gas-liquid separator VII, K respectively; m _r,v、m_r,l is the mass flow of the working medium at the outlet of the liquid phase branch of the gas-liquid separator VII and the mass flow of the working medium at the outlet of the gas phase branch of the gas-liquid separator VII respectively, and KJ is KJ kg ^-1, wherein s ^-1;h_lv is the phase change latent heat of the working medium of the evaporator in the regulating and metering refrigeration cycle;

the test section heat load adopts an air duct checking calculation according to the following formula:

Q_C＝C_p,a×m_a×(T_a,o-T_a,i)

Q_e＝C_p,a×m_a×(T_a,i-T_a,o)

Wherein, Q _c、Q_e is the heat load of the detected condenser and the detected evaporator, W; c _p,a is the specific heat capacity of air, J/(kg. K); m _a is the air mass flow in the air duct, kg & lts & gt ^-1;T_a,i,T_a,o & lt/EN & gt is the air temperature at the inlet and the air temperature at the outlet of the condenser or the evaporator to be tested, K;

in the condenser test cycle (A), the first gas phase branch comprises a first gas phase opening valve (131) and a first gas phase flowmeter (141), the upper port of the first gas-liquid separator (121), the first gas phase opening valve (131), the first gas phase flowmeter (141) and the first condenser (15) are sequentially connected, the first liquid phase branch comprises a first liquid phase opening valve (132) and a first liquid phase flowmeter (142), and the lower port of the first gas-liquid separator (121), the first liquid phase opening valve (132), the first liquid phase flowmeter (142) and the first condenser (15) are sequentially connected;

In the evaporator test cycle (B), the first condenser (15) is connected to a second regulating heat exchanger (17) via a first throttle valve (133).

2. The dual refrigeration cycle reverse-coupling heat exchanger performance test system of claim 1, wherein: in the condenser test cycle (A), the first condenser (15) is connected to the second evaporator (16) via a first throttle valve (133).

3. The dual refrigeration cycle reverse-coupling heat exchanger performance test system of claim 2, wherein: in the condenser test cycle (A), the second condenser (26) is connected with the third gas-liquid separator (223) through a second throttle opening valve (231), the upper port of the third gas-liquid separator (223) is connected with the upper port of the fifth gas-liquid separator (221), the lower port of the third gas-liquid separator (223) is divided into two paths, one path is connected with the first regulating heat exchanger (27) through a third throttle opening valve (232), and the other path is connected with the first evaporator (25).

4. The dual refrigeration cycle reverse-coupling heat exchanger performance test system of claim 3, wherein: in the condenser test cycle (A), the upper port of the fourth gas-liquid separator (222) is connected with the upper port of the fifth gas-liquid separator (221) through a second gas-phase flowmeter (241), and the first regulating heat exchanger (27) is connected with the upper port of the fifth gas-liquid separator (221).

5. The dual refrigeration cycle reverse-coupling heat exchanger performance test system of claim 4, wherein: in the evaporator test cycle (B), the second gas phase branch comprises a second gas phase opening valve (134) and a third gas phase flowmeter (143), the upper port of the sixth gas-liquid separator (123), the second gas phase opening valve (134), the third gas phase flowmeter (143) and the second condenser (26) are sequentially connected, the second liquid phase branch comprises a second liquid phase opening valve (135) and a second liquid phase flowmeter (144), and the lower port of the sixth gas-liquid separator (123), the second liquid phase opening valve (135), the second liquid phase flowmeter (144) and the second condenser (26) are sequentially connected.

6. The dual refrigeration cycle reverse-coupling heat exchanger performance test system of claim 5, wherein: in the evaporator test cycle (B), the third gas phase branch comprises a fourth gas phase flowmeter (243) and a second regulating heat exchanger (17), the upper port of the seventh gas-liquid separator (224), the fourth gas phase flowmeter (243) and the second regulating heat exchanger (17) are sequentially connected, the second regulating heat exchanger (17) is connected with the first evaporator (25) through a second throttle opening valve (231), the third liquid phase branch comprises a third liquid phase flowmeter (242), the lower port of the seventh gas-liquid separator (224) is connected with the third liquid phase flowmeter (242), and the third liquid phase flowmeter (242) is connected with the first evaporator (25) through the second throttle opening valve (231).

7. The dual refrigeration cycle reverse-coupling heat exchanger performance test system of claim 6, wherein: in the evaporator test cycle (B), the upper port of the fourth gas-liquid separator (222) is connected to the second compressor (21) through a second gas phase flow meter (241).

8. The dual refrigeration cycle reverse-coupling heat exchanger performance test system of claim 1, wherein: the first test air duct system (3) comprises a fan, a first current equalizer (31) and a second current equalizer (32), the first current equalizer (31) and the second current equalizer (32) are respectively arranged on the front side and the rear side of the first condenser (15) facing the wind, the second test air duct system (4) comprises a fan, a third current equalizer (41) and a fourth current equalizer (42), and the third current equalizer (41) and the fourth current equalizer (42) are respectively arranged on the front side and the rear side of the second evaporator (16) facing the wind; physical parameter measuring instruments are arranged in the first test air duct system (3) and the second test air duct system (4).