Performance test system for water-cooled water chilling unit

Abstract

The invention discloses a performance testing system for a water-cooled water chilling unit. The testing system comprises a heat testing subsystem, a cooling capacity testing subsystem, a heat and cooling capacity exchange subsystem and a phase change adjusting subsystem. Wherein the heat testing subsystem and the cold testing subsystem exchange heat in a water mixing manner; the heat testing subsystem, the heat and cold exchange subsystem and the phase change adjusting subsystem are communicated through a constant-temperature water tank, and redundant heat in the system enters a cooling tower through the heat and cold exchange subsystem or the phase change adjusting subsystem and is discharged outdoors. The water inlet temperature and flow of the evaporator of the tested machine are controlled by adjusting the operation frequencies of the chilled water pump and the chilled water mixing pump; the water inlet temperature and flow of the condenser are controlled by adjusting the operation frequency of the cooling water pump and the cooling water mixing pump. The test system not only can improve the test efficiency, but also can reduce the test operation cost.

Description

Technical Field

[0001] The invention provides a water-cooled chiller performance test system, belonging to the field of chiller performance test. Background Art

[0002] As people's requirements for the comfort of their living environment continue to increase, this has injected strong impetus into the vigorous development of the domestic air-conditioning industry. In large and medium-sized central air-conditioning systems, the application of chillers is becoming more and more extensive, and accordingly, the market demand for chiller test devices is also increasing day by day. However, there are many significant disadvantages in the current chiller test devices on the market, such as high operating costs, long commissioning cycles, and low energy efficiency. In view of this, the development of a new chiller test device with fast and precise adjustment functions and heat recovery has become an important issue that needs to be urgently solved in the industry. Summary of the invention

[0003] The purpose of the present invention is to improve the testing efficiency of a chiller and reduce its operating cost, and to design a performance testing system for a water-cooled chiller.

[0004] The embodiment of the present application provides a water-cooled chiller performance detection system, which is composed of a heat test subsystem I, a cold test subsystem II, a heat and cold exchange subsystem III, and a phase change regulation subsystem IV.

[0005] The heat test subsystem I includes: a cooling water circulation pipeline and a cooling water mixing pipeline; on the cooling water circulation pipeline, a first cooling water thermometer T1, a second cooling water thermometer T2, a sixth cooling water thermometer T6, a first cooling water pressure gauge P1, a second cooling water pressure gauge P2, a first cooling water valve 7, a cooling water flowmeter 8, a cooling water pump 9, and a second cooling water valve 10 are installed; the first cooling water thermometer T1 and the first cooling water pressure gauge P1 are both arranged on the water inlet pipeline near the condenser 1 of the machine under test; the second cooling water thermometer T2 and the second cooling water pressure gauge P2 are both arranged on the water outlet pipeline near the condenser 1 of the machine under test; the sixth cooling water thermometer T6 is arranged on the cooling water circulation pipeline after the confluence point of the cooling water mixing pipeline and the water outlet pipeline from the cooling water pump 9; the water outlet end of the condenser 1 of the machine under test in the cooling water circulation pipeline is communicated with the water inlet end of the second cooling water valve 10; the water outlet end of the second cooling water valve 10 forms three branches. Branch ① serves as the hot water side inlet pipeline of the heat exchanger, Branch ② serves as the inlet pipeline of the chilled water mixing pipeline, and Branch ③ serves as the cooling water circulation pipeline; the Branch ③ pipeline at the water outlet end of the second cooling water valve 10 converges with the Branch ④ pipeline at the water outlet end of the first chilled water valve 14, and after convergence, it flows into the water inlet end of the cooling water pump 9; the pipeline at the water outlet end of the cooling water pump 9 converges with the cooling water mixing pipeline and serves as the inlet pipeline of the cooling water; the converged cooling water inlet pipeline flows into the water inlet end of the cooling water flowmeter 8; the water outlet end of the cooling water flowmeter 8 is communicated with the water inlet end of the first cooling water valve 7; the water outlet end of the first cooling water valve 7 is communicated with the water inlet end of the condenser 1 of the machine under test; The cooling water mixing pipeline includes a constant temperature water tank 3, a first cooling water mixing pipeline valve 11, a cooling water mixing pump 12, and a second cooling water mixing pipeline valve 13; the constant temperature water tank includes: an electric heating device 36 and a constant temperature water tank thermometer T8; the a water outlet end of the constant temperature water tank 3 in the cooling water mixing pipeline is communicated with the water inlet end of the first cooling water mixing pipeline valve 11; the water outlet end of the first cooling water mixing pipeline valve 11 is communicated with the water inlet end of the cooling water mixing pump 12; the water outlet end of the cooling water mixing pump 12 is communicated with the water inlet end of the second cooling water mixing pipeline valve 13; the pipeline at the water outlet end of the second cooling water mixing pipeline valve 13 converges with the pipeline at the water outlet end of the cooling water pump 9, and after convergence, it serves as the inlet pipeline of the cooling water.

[0006] The shown cooling capacity test subsystem II includes a chilled water circulation pipeline and a chilled water mixing pipeline; the chilled water circulation pipeline includes a first chilled water thermometer T3, a second chilled water thermometer T4, a third chilled water thermometer T5, a first chilled water pressure gauge P3, a second chilled water pressure gauge P4, a first chilled water valve 14, a chilled water pump 18, a chilled water flowmeter 20, a second chilled water valve 19, and a third chilled water valve 21; the first chilled water thermometer T3 and the first chilled water pressure gauge P3 are arranged on the water outlet pipeline near the evaporator 2 of the machine under test; the second chilled water thermometer T4 and the second chilled water pressure gauge 2P4 are arranged on the water inlet pipeline near the evaporator 2 of the machine under test; the third chilled water thermometer (T5 is arranged on the chilled water circulation pipeline after the convergence of the chilled water mixing pipeline and the water outlet pipeline of the chilled water pump 18; the water outlet end of the evaporator 2 of the machine under test in the chilled water circulation pipeline is communicated with the water inlet end of the second chilled water valve 19; the water outlet end of the second chilled water valve 19 forms two branches, the ④ branch serves as the chilled water outlet pipe; the ⑤ branch serves as the chilled water circulation pipeline; the ④ branch flows into the water inlet end of the first chilled water valve 14;; the water outlet pipeline of the first chilled water valve 14 converges with the cooling water circulation pipeline ③; the ⑤ branch flows into the water inlet end of the chilled water pump 18; the water outlet pipeline of the chilled water pump 18 converges with the chilled water mixing pipeline and then flows into the water inlet end of the chilled water flowmeter 20; the water outlet end of the chilled water flowmeter 20 is communicated with the water inlet end of the third chilled water valve 21; the water outlet end of the third chilled water valve 21 is communicated with the water inlet end of the evaporator 2 of the machine under test; A first chilled water mixing pipeline valve 15, a chilled water mixing pump 17, and a second chilled water mixing pipeline valve 16 are installed on the chilled water mixing pipeline; the ② branch serves as the water inlet pipeline of the chilled water mixing pipeline and flows into the first chilled water mixing pipeline valve 15; the water outlet end of the first chilled water mixing pipeline valve 15 is communicated with the water inlet end of the chilled water mixing pump 17; the water outlet end of the chilled water mixing pump 17 is communicated with the water inlet end of the second chilled water mixing pipeline valve 16; the water outlet pipeline of the second chilled water mixing pipeline valve 16 converges with the water outlet pipeline of the chilled water pump 19, and after convergence, it serves as the water inlet pipeline of the chilled water.

[0007] The heat and cold quantity exchange subsystem III includes: a heat exchanger 6, a constant temperature water tank 3, a cooling tower 5, a first heat exchanger valve 28, a second heat exchanger valve 29, a third heat exchanger valve 30, a fourth heat exchanger valve 31, a flowmeter 32 for the cooling tower circulation pipeline, a water pump 33 for the cooling tower circulation pipeline, a first valve 34 for the cooling tower circulation pipeline, a second valve 35 for the cooling tower circulation pipeline, a first thermometer T7 for the cooling tower circulation pipeline, and a first pressure gauge P7 for the cooling tower circulation pipeline; the first thermometer T7 and the first pressure gauge P7 for the cooling tower circulation pipeline are both arranged on the cooling tower circulation pipeline between the water pump 33 for the cooling tower circulation pipeline and the flowmeter 32 for the cooling tower circulation pipeline; the ① branch flows into the water inlet end of the fourth heat exchanger valve 31 as the hot water side inlet pipeline of the heat exchanger; the water outlet end of the fourth heat exchanger valve 31 is communicated with the hot water inlet end of the heat exchanger 6a; the hot water outlet end of the heat exchanger 6b is communicated with the water inlet end of the second heat exchanger valve 29; the water outlet end of the second heat exchanger valve 29 is communicated with the water inlet end of the constant temperature water tank 3b; the cold water side inlet pipeline of the heat exchanger flows out from the cooling tower 5; the water outlet end of the cooling tower 5 is communicated with the water inlet end of the first valve 34 for the cooling tower side circulation pipeline; the water outlet end of the valve 34 for the cooling tower circulation pipeline is communicated with the water inlet end of the water pump 33 for the cooling tower circulation pipeline; the water outlet end of the water pump 33 for the cooling tower circulation pipeline is communicated with the water inlet end of the flowmeter 32 for the cooling tower circulation pipeline; the water outlet end of the flowmeter 32 for the cooling tower circulation pipeline is communicated with the water inlet end of the first heat exchanger valve 28; the water outlet end of the first heat exchanger valve 28 is communicated with the cold water inlet end of the heat exchanger 6c; the cold water outlet end of the heat exchanger 6d is communicated with the water inlet end of the third heat exchanger valve 30; the water outlet end of the third heat exchanger valve 30 belonging to the heat exchanger is communicated with the water inlet end of the second valve 35 for the cooling tower circulation pipeline; the water outlet end of the second valve 35 for the cooling tower circulation pipeline is communicated with the water inlet end on the side of the cooling tower 5;

[0008] The phase change regulating subsystem IV includes: a constant temperature water tank 3, a chiller 4, a cooling tower 5, a first valve 22 on the first water inlet pipeline of the chiller, a water pump 23 on the first water inlet pipeline of the chiller, a second valve 24 on the first water inlet pipeline of the chiller, a third valve 25 on the first water outlet pipeline of the chiller, a fourth valve 26 on the second water inlet pipeline of the chiller, a fifth valve 27 on the second water outlet pipeline of the chiller, a flowmeter 32 on the cooling tower circulation pipeline, a water pump 33 on the cooling tower circulation pipeline, a first valve 34 on the cooling tower circulation pipeline, a second valve 35 on the cooling tower circulation pipeline, a first thermometer T7 on the cooling tower circulation pipeline, and a first pressure gauge P7 on the cooling tower circulation pipeline; the water inlet end of the second water inlet pipeline of the chiller flows out from the water outlet end of the constant temperature water tank 3c; the water outlet end of the constant temperature water tank 3c is connected to the water inlet end of the second valve 24 on the first water inlet pipeline of the chiller; the water outlet end of the second valve 24 on the first water inlet pipeline of the chiller is connected to the water inlet end of the water pump 23 on the first water inlet pipeline of the chiller; the water outlet end of the water pump 23 on the first water inlet pipeline of the chiller is connected to the water inlet end of the first valve 22 on the first water inlet pipeline of the chiller; the water outlet end of the first valve 22 on the first water inlet pipeline of the chiller is connected to the water inlet end of the chiller 4a; the water outlet end of the chiller 4b is connected to the water inlet end of the third valve 25 on the first water outlet pipeline of the chiller; the water outlet end of the third valve 25 on the first water outlet pipeline of the chiller is connected to the water inlet end of the constant temperature water tank 3d; the water inlet end of the second water inlet pipeline of the chiller flows out from the water outlet end of the cooling tower 5; the water outlet end of the cooling tower 5 is connected to the water inlet end of the first valve 34 on the side circulation pipeline of the cooling tower; the water outlet end of the first valve 34 on the cooling tower circulation pipeline is connected to the water inlet end of the water pump 33 on the cooling tower circulation pipeline; the water outlet end of the water pump 33 on the cooling tower circulation pipeline is connected to the water inlet end of the flowmeter 32 on the cooling tower circulation pipeline; the water outlet end of the flowmeter 32 on the cooling tower circulation pipeline is connected to the water inlet end of the fourth valve 26 on the second water inlet pipeline of the chiller; the water outlet end of the fourth valve 26 on the second water inlet pipeline of the chiller is connected to the water inlet end of the chiller 4c; the water outlet end of the chiller 4d is connected to the water inlet end of the fifth valve 27 on the second water outlet pipeline of the chiller; the water outlet end of the fifth valve 27 on the second water outlet pipeline of the chiller is connected to the water inlet end of the second valve 35 on the cooling tower circulation pipeline; the water outlet end of the second valve 35 on the cooling tower circulation pipeline is connected to the side water inlet end of the cooling tower.

[0009] Further, the ④ branch at the water outlet end of the second chilled water valve 19 is mixed with the ③ branch from the water outlet end of the second cooling water valve 10, thereby reducing the outlet temperature of the cooling water; and the water outlet pipeline of the cooling water pump 9 is further mixed with the cooling water mixing pipeline to further reduce the temperature of the cooling water as the inlet water of the cooling water; the pipeline at the water outlet end of the chilled water pump 18 is mixed with the chilled water mixing pipeline to increase the inlet temperature of the chilled water as the inlet water of the chilled water.

[0010] Further, when the heat exchanger 6 is started, the hot water in the ① branch pipeline is heat-exchanged with the cold water from the cooling tower 5, thereby reducing the outlet temperature of the hot water in the heat exchanger. The cooled hot water enters the constant temperature water tank to maintain the temperature in the constant temperature water tank, and the heated cold water returns to the cooling tower 5 for cooling.

[0011] The present invention also provides a performance detection system and method for a water-cooled chiller, which can more efficiently and environmentally complete the performance test of the water-cooled chiller. A test method for a water-cooled chiller test system is as follows:

[0012] Step (1): Before the test starts, the cooling water circulation pipeline and the chilled water circulation pipeline of the heat quantity test subsystem I and the cooling capacity test subsystem II are respectively penetrated into the condenser 1 and the evaporator 2 of the machine under test; the constant temperature water tank 3 and the phase change regulation subsystem IV supply heat to the heat quantity test subsystem I.

[0013] Further, step (1) includes the following steps: 1) The cooling water circulation pipeline in the heat quantity test subsystem I penetrates into the heat supply side of the condenser 1 of the machine under test, and the chilled water circulation pipeline in the cooling capacity test subsystem II penetrates into the refrigeration side of the evaporator 2 of the machine under test; 2) Start the electric heating device 36 in the constant temperature water tank 3 and the chiller in the phase change regulation subsystem IV; raise the water temperature in the constant temperature water tank 3; 3) The heat in the constant temperature water tank 3 is transferred to the heat quantity test subsystem I.

[0013] Step (2): When the cooling water temperature in the heat quantity test subsystem I reaches the start temperature t0, the chiller under test is started, and at this time, the electric heating device of the constant temperature water tank 3 can be turned off as needed.

[0014] Further, step (2) includes: 1) When the inlet water temperature t1 of the cooling water reaches the start temperature t0 of the machine under test, the condenser 1 of the machine under test starts to supply heat, and the evaporator 2 of the machine under test starts to refrigerate; 2) Control the start and stop of the electric heating device 36 in the constant temperature water tank according to the cooling water inlet temperature; when t1≥t0, the electric heating device 36 is turned off; when t1≤t0, the electric heating device 36 is started; the central water temperature measured by the thermometer T8 in the constant temperature water tank 3 is a constant value, and this constant value is not lower than the central water temperature of the constant temperature water tank 3 measured by the temperature sensor T8 at the moment when t1 and t0 are equal.

[0015] Step (3): The heat quantity test subsystem I tests the heat supply capacity of the condenser 1 of the chiller under test under different working conditions; the cooling capacity test subsystem II tests the heat supply capacity of the evaporator 2 of the chiller under test under different working conditions.

[0016] Further, step (3) includes the following steps: 1) According to different working condition requirements, measure the temperature of the mixed cooling water using the third cooling water thermometer T6; transmit the signal measured by the third cooling water thermometer T6 to the controller K1; the controller K1 adjusts the operation frequency of the cooling water mixing pump 12 to regulate the cold water in the constant temperature water tank 3 entering the cooling water circulation pipeline, thereby adjusting the inlet temperature of the cooling water; the controller K1 adjusts the operation frequency of the cooling water pump 9 to regulate the hot water generated by the condenser 1 of the machine under test entering the inlet pipeline of the cooling water, thereby adjusting the inlet flow rate of the cooling water; 2) According to different working condition requirements, measure the temperature of the mixed chilled water using the third chilled water thermometer T5; transmit the signal measured by the third chilled water thermometer T5 to the controller K2; the controller K2 adjusts the operation frequency of the chilled water mixing pump 17 to regulate the hot water generated by the condenser 1 of the machine under test entering the chilled water circulation pipeline, thereby adjusting the inlet temperature of the chilled water; the controller K2 adjusts the operation frequency of the chilled water pump 18 to regulate the cold water generated by the evaporator 1 of the machine under test entering the chilled water circulation pipeline, thereby adjusting the inlet flow rate of the chilled water; at the same time, further control the flow rate entering the ④ branch pipeline.

[0017] Step (4): The heat and cold quantity test subsystem III exchanges heat between the hot water generated in the heat test subsystem I and the cold water generated in the cooling tower 5. At this time, the chiller 4, the first inlet and outlet pipeline pump of the chiller, the valve, and the second inlet and outlet pipeline valve of the chiller in the phase change regulation subsystem IV are closed.

[0018] Further, step (4) includes the following steps: 1) The hot water in the ① branch pipeline enters the a hot water end of the heat exchanger 6, and this hot water exchanges heat with the cold water from the cooling tower 5; the hot water entering the heat exchanger enters the b water inlet end of the constant temperature water tank 3 after heat exchange; the a water outlet end of the constant temperature water tank 3 flows into the cooling water mixing pipeline, and thus enters the cooling water circulation pipeline of the heat test subsystem I; 2), after the water flow rate in the cooling tower side circulation pipeline is measured by the first thermometer in the cooling tower circulation pipeline for the temperature in the outlet pipeline of the cooling tower, the signal is transmitted to the controller K3, and the controller K3 will control the operation frequency of the cooling tower circulation pipeline pump 33, thereby controlling the water flow rate in the cooling tower circulation pipeline. And the cold water entering the heat exchanger 6 enters the cooling tower 5 for cooling treatment after heat exchange, and then flows back into the heat exchanger; through the above process, the excess heat generated in the test system is balanced.

[0019] Step (5): The phase change regulation subsystem IV cools the heat generated in the heat test subsystem I in the constant temperature water tank 3. At this time, the first valve 28 and the third valve 30 of the heat exchanger are closed, that is, the heat exchanger 6 does not participate in the heat exchange regulation.

[0020] Further, step (5) includes the following steps: 1) Since the heat exchanger 6 is not involved in heat exchange regulation, the hot water in the ① branch pipeline will enter the constant temperature water tank through the heat exchanger 6; at this time, the water in the constant temperature water tank enters the chiller 4 through the first water inlet pipeline of the chiller; the chiller 4 cools this water; after the cooling treatment, the cooled cold water enters the constant temperature water tank 3 through the first water outlet pipeline of the chiller; thus, the water in the constant temperature water tank 3 is maintained at a stable temperature; the water flow rate in this circulation pipeline is determined by the operating frequency of the chiller 4; 2) The chiller 4 is connected to the cooling tower 5; the cooling tower circulation pipeline water pump 33 flows the cooled cold water into the chiller 4; and the excess heat in the chiller 4 enters the cooling tower and is discharged outdoors; at this time, the water flow rate in the cooling tower circulation pipeline is determined by the operating frequency of the chiller 4. Description of the Drawings

[0021] Figure 1 It is a phase change regulation method for a water-cooled chiller performance test system, Figure 2 It is a heat and cold quantity exchange regulation method for a water-cooled chiller performance test system; Figure 1 、 Figure 2 The actual corresponding relationships between the labels and component names in

[0021] are described as follows: Heat measurement subsystem I: Cooling water first thermometer T1, cooling water second thermometer T2, cooling water third thermometer T6, cooling water first pressure gauge P1, cooling water second pressure gauge P2, cooling water first valve 7, cooling water flowmeter 8, cooling water water pump 9, cooling water second valve 10, chilled water mixing pipeline first valve 15, chilled water mixing water pump 17, chilled water mixing pipeline second valve 16.

[0023] Cold quantity measurement subsystem II: Chilled water first thermometer T3, chilled water second thermometer T4, chilled water third thermometer T5, chilled water first pressure gauge P3, chilled water second pressure gauge P4, chilled water first valve 14, chilled water water pump 18, chilled water flowmeter 20, chilled water second valve 19, chilled water third valve 21, chilled water mixing pipeline first valve 15, chilled water mixing water pump 17, chilled water mixing pipeline second valve 16.

[0024] Phase change regulation subsystem IV: Constant temperature water tank 3, chiller 4, cooling tower 5, first valve 22 of the first water inlet pipeline of the chiller, water pump 23 of the first water inlet pipeline of the chiller, second valve 24 of the first water inlet pipeline of the chiller, third valve 25 of the first water outlet pipeline of the chiller, fourth valve 26 of the second water inlet pipeline of the chiller, fifth valve 27 of the second water outlet pipeline of the chiller, flowmeter 32 of the cooling tower circulation pipeline, water pump 33 of the cooling tower circulation pipeline, first valve 34 of the cooling tower circulation pipeline, second valve 35 of the cooling tower circulation pipeline, first thermometer T7 of the cooling tower circulation pipeline, first pressure gauge P7 of the cooling tower circulation pipeline. Detailed implementation mode

[0025] To make the technical solution of the present invention clearer and more definite, the present invention will be described clearly and completely below with reference to the accompanying drawings. All solutions obtained by equivalent replacement and conventional reasoning of the technical features of the technical solution of the present invention by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0026] The water-cooled chiller performance detection system of the present invention includes: heat test subsystem I, cooling capacity test subsystem II, heat and cooling capacity test subsystem III, and phase change regulation subsystem IV.

[0027] Example 1

[0028] When the heat and cooling capacity exchange subsystem III is selected for testing, that is, there is flow through both the hot water side and the cold water side of the heat exchanger 6, and the valves of the first and second water inlet and outlet pipelines of the chiller 4 are closed. The heat test subsystem I and the cooling capacity test subsystem II perform heat exchange through the mixing water method; the heat test subsystem I is connected to the heat and cooling capacity exchange subsystem III through the constant temperature water tank 3 and also performs heat exchange through the mixing water method; ① The hot water in the branch pipeline exchanges heat with the cold water from the cooling tower circulation pipeline in the heat exchanger 6.

[0029] Heat test subsystem I

[0030] The heat test subsystem I is used to test various performance parameters of the condenser 1 of the machine under test.

[0031] Its specific composition is as Figure 1 described, Figure 1 and Figure 2The same. The heat test subsystem I includes a cooling water circulation pipeline and a cooling water mixing pipeline; among them, the cooling water circulation pipeline includes a first cooling water thermometer T1, a second cooling water thermometer T2, a sixth cooling water thermometer T6, a first cooling water pressure gauge P1, a second cooling water pressure gauge P2, a first cooling water valve 7, a cooling water flowmeter 8, a cooling water pump 9, and a second cooling water valve 10; the cooling water mixing pipeline includes a constant temperature water tank 3, a first valve 11 in the cooling water mixing pipeline, a cooling water mixing pump 12, and a second valve 13 in the cooling water mixing pipeline. The cooling water in the cooling water circulation pipeline is connected to the chilled water in the chilled water circulation pipeline and is also connected to the constant temperature water tank 3. The first cooling water thermometer T1 and the first cooling water pressure gauge P1 are arranged on the cooling water inlet pipeline near the condenser 1 of the machine under test; the second cooling water thermometer T2 and the second cooling water pressure gauge P2 are arranged on the cooling water outlet pipeline near the condenser 1 of the machine under test; the sixth cooling water thermometer T6 is arranged on the cooling water circulation pipeline after the confluence point of the cooling water mixing pipeline and the outlet pipeline from the cooling water pump 9.

[0032] When performing the performance test on the condenser 1 of the machine under test, the condenser 1 of the machine under test continuously generates hot water; a part of the hot water flows into the cold quantity test subsystem II through the ② branch pipeline; a part of the hot water flows into the heat exchanger 6 through the ① branch pipeline and then into the constant temperature water tank 3, and a part of the hot water continues in the cooling water circulation pipeline through the ③ branch pipeline; the hot water in the ③ branch pipeline is mixed with the cold water from the ④ branch pipeline to reduce the water temperature in the cooling water circulation pipeline; the mixed cooling water is mixed with the constant temperature water in the constant temperature water tank to further reduce the temperature of the cooling water, so as to reach the inlet water temperature of the cooling water. The first cooling water thermometer T1 and the first cooling water pressure gauge P1 measure the inlet water temperature t1 and pressure p1 of the cooling water, the second cooling water thermometer T2 and the second cooling water pressure gauge P2 measure the outlet water temperature t2 and pressure p2 of the cooling water, and the sixth cooling water thermometer 6 measures the temperature t6 after mixing a part of the cooling water outlet, a part of the chilled water outlet, and the constant temperature water in the constant temperature water tank. Among them, it is certain that t2>t1. The temperature t6 measured by the sixth cooling water thermometer T6 transmits corresponding signals to the controller K1 to respectively control the operating frequencies of the cooling water pump 9 and the cooling water mixing pump 13, so as to change the flow rate, temperature, and pressure of the cooling water in the cooling water circulation pipeline, and thus the performance test of the condenser 1 of the machine under test can be carried out under different conditions.

[0033] The heat calculation formula generated by the condenser 1 of the machine under test is: Q1 = C1ρ1q1(t2 - t1).

[0034] Among them, Q1 is the heat generated by the condenser 1 of the machine under test, C1 is the specific heat capacity of water at the temperature corresponding to the arithmetic mean of t2 and t1, ρ1 is the density of water at the temperature corresponding to the arithmetic mean of t2 and t1, and q1 is the water flow rate measured by the cooling water flowmeter 8. t1 is the temperature measured by the first cooling water thermometer T1, and t2 is the temperature measured by the second cooling water thermometer T2.

[0035] Cooling Capacity Testing Subsystem II

[0036] The Cooling Capacity Testing Subsystem II is used to test various performance parameters of the evaporator 2 of the machine under test.

[0037] Its specific composition is as Figure 1 described, Figure 2 the same as Figure 1 that. The Cooling Capacity Testing Subsystem II includes a chilled water circulation pipeline and a chilled water mixing pipeline. The chilled water circulation pipeline includes a first chilled water thermometer T3, a second chilled water thermometer T4, a third chilled water thermometer T5, a first chilled water pressure gauge P3, a second chilled water pressure gauge P4, a first chilled water valve 14, a chilled water pump 18, a chilled water flowmeter 20, a second chilled water valve 19, and a third chilled water valve 21; a first chilled water mixing pipeline valve 15, a chilled water mixing pump 17, and a second chilled water mixing pipeline valve 16 are installed on the chilled water mixing pipeline; the first chilled water thermometer T3 and the first chilled water pressure gauge P3 are arranged on the outlet pipeline of the evaporator 2 of the machine under test, and the second chilled water thermometer T4 and the second chilled water pressure gauge P4 are arranged on the inlet pipeline of the evaporator 2 of the machine under test; the third chilled water thermometer T5 is arranged on the chilled water circulation pipeline after the confluence point of the chilled water mixing pipeline and the pipeline at the outlet end of the chilled water pump 18.

[0038] When conducting the performance test of the evaporator 2 of the machine under test, the evaporator 2 of the machine under test continuously generates chilled water; the heat test subsystem I and the chilled water test subsystem II are interconnected; a part of the hot water generated by the heat test subsystem I enters the chilled water test subsystem II through the ② branch pipeline; a part of the chilled water generated by the chilled water test subsystem II enters the heat test subsystem I through the ④ branch pipeline. The chilled water in the chilled water circulation pipeline is mixed with the hot water from the heat test subsystem I to increase the temperature of the chilled water, so as to meet the inlet water temperature requirement of the evaporator. The first chilled water thermometer T3 and the first chilled water pressure gauge P3 measure the outlet water temperature t3 and pressure p3 of the chilled water, the second chilled water thermometer T4 and the second chilled water pressure gauge P4 measure the inlet water temperature t4 and pressure p4 of the chilled water, and the third chilled water thermometer T5 measures the temperature after mixing a part of the chilled water outlet and a part of the cooling water outlet. Among them, it is certain that t4 > t3. The third chilled water thermometer T5 measures the temperature t5 and transmits the corresponding signal to the controller K2. The controller K2 respectively transmits control signals to the chilled water pump 18 and the chilled water mixing pump 17, so as to control their operating frequencies, thereby changing the flow rate, temperature and pressure of the chilled water in the chilled water circulation pipeline, and the performance test of the evaporator 2 of the machine under test can be carried out under different working conditions.

[0039] The calculation formula for the chilled water generated by the evaporator 2 of the machine under test is: Q2 = C2ρ2q2(t4 - t3)

[0040] Where Q2 is the heat generated by the evaporator of the machine under test, C2 is the specific heat capacity of water at the temperature corresponding to the arithmetic mean of t4 and t3, ρ2 is the density of water at the temperature corresponding to the arithmetic mean of t4 and t3, and q2 is the water flow rate measured by the chilled water flowmeter 20. t3 is the temperature measured by the cooling water thermometer T3, and t4 is the temperature measured by the cooling water thermometer T4.

[0041] Thermal and chilled water exchange subsystem III

[0042] The thermal and chilled water exchange system III is mainly used to exchange heat between the hot water from the cooling water circulation pipeline and the chilled water from the cooling tower circulation pipeline to achieve the purpose of heat balance.

[0043] Its specific structure is as Figure 1 , Figure 2 And Figure 1The same. The heat and cold quantity exchange subsystem III includes: heat exchanger 6, constant temperature water tank 3, cooling tower 5, first valve 28 of the heat exchanger, second valve 29 of the heat exchanger, third valve 30 of the heat exchanger, fourth valve 31 of the heat exchanger, flowmeter 32 of the cooling tower circulation pipeline, water pump 33 of the cooling tower circulation pipeline, first valve 34 of the cooling tower circulation pipeline, second valve 35 of the cooling tower circulation pipeline, first thermometer T7 of the cooling tower circulation pipeline, and first pressure gauge P7 of the cooling tower circulation pipeline; the first thermometer T7 of the cooling tower circulation pipeline and the first pressure gauge P7 of the cooling tower circulation pipeline are both arranged on the cooling tower circulation pipeline between the water pump 33 of the cooling tower circulation pipeline and the flowmeter 32 of the cooling tower circulation pipeline.

[0044] When performing heat and cold quantity heat exchange, ① the hot water in the branch pipeline exchanges heat with the cold water inlet heat from the cooling tower 5. The hot water in the ① branch pipeline flows into the b inlet end of the constant temperature water tank 3 after heat exchange and cooling; while the water in the constant temperature water tank enters the cooling water mixing pipeline from the a outlet end, thereby participating in the regulation of the cooling water inlet temperature and flow rate. The cold water from the cooling tower 5 flows into the cooling tower circulation pipeline through the cold water side outlet pipeline of the heat exchanger after heat exchange and temperature rise, and finally flows into the cooling tower 5 through the cooling tower circulation pipeline, and the excess heat is discharged to the outside in the cooling tower 5. The first thermometer T7 of the cooling tower circulation pipeline measures the outlet water temperature t7 of the cooling tower 5, the first pressure gauge P7 of the cooling tower circulation pipeline measures the outlet water pressure p7 of the cooling tower 5, and the flowmeter 32 of the cooling tower circulation pipeline measures the flow rate in the cooling tower circulation pipeline. When using the heat and cold quantity exchange subsystem III, the first thermometer T7 of the cooling tower circulation pipeline transmits the measured temperature signal to the controller K3, and K3 then transmits the signal to the water pump 33 of the cooling tower circulation pipeline, thereby controlling the operating frequency of the water pump 33 of the cooling tower circulation pipeline, so as to control the flow rate and temperature on the cooling tower side.

[0045] Example 2

[0046] When the phase change regulation subsystem IV is selected for testing, that is, the valve of the cold water side inlet pipeline of the heat exchanger is closed, and the rest are all opened. The heat quantity test subsystem I and the cold quantity test subsystem II perform heat exchange by the mixing method, and the adjustment method is the same as that in Example 1, which will not be elaborated here; the heat quantity test subsystem I is connected to the phase change regulation subsystem IV through the constant temperature water tank 3, and also performs heat exchange by the mixing method. The chiller 4 absorbs the excess heat in the constant temperature water tank 3, and finally discharges the excess heat to the outside through the cooling tower 5.

[0047] Phase change regulation subsystem IV

[0048] Its specific structure is as Figure 1 , Figure 1 and Figure 2The same. The phase change regulating subsystem IV includes: a constant temperature water tank 3, a chiller 4, a cooling tower 5, a first valve 22 on the first water inlet pipeline of the chiller, a water pump 23 on the first water inlet pipeline of the chiller, a second valve 24 on the first water inlet pipeline of the chiller, a third valve 25 on the first water outlet pipeline of the chiller, a fourth valve 26 on the second water inlet pipeline of the chiller, a fifth valve 27 on the second water outlet pipeline of the chiller, a flowmeter 32 on the cooling tower circulation pipeline, a water pump 33 on the cooling tower circulation pipeline, a first valve 34 on the cooling tower circulation pipeline, a second valve 35 on the cooling tower circulation pipeline, a first thermometer T7 on the cooling tower circulation pipeline, and a first pressure gauge P7 on the cooling tower circulation pipeline. The installation methods of the first thermometer T7 and the first pressure gauge P7 on the cooling tower circulation pipeline are the same as those in the heat and cold quantity exchange subsystem III, and will not be elaborated here.

[0049] When performing heat and cold quantity balance, ① the hot water in the branch pipeline first flows into the heat exchanger 5 and then into the constant temperature water tank 3; during this process, the inlet and outlet water pipeline valves on the cold water side of the heat exchanger 5 are closed, and the heat exchanger 5 does not participate in heat and cold quantity exchange. The constant temperature water tank 3 and the chiller 4 are connected through the first water inlet and outlet pipelines of the chiller; the water in the constant temperature water tank will flow into the chiller 4 through the first water inlet pipeline of the chiller for cooling, and the cooled water will flow back into the constant temperature water tank through the first water outlet pipeline of the chiller; in this way, the temperature of the water in the constant temperature water tank is maintained. The chiller 4 and the cooling tower 5 are connected through the cooling tower circulation pipeline and the second water inlet and outlet pipelines of the chiller. The heat generated in the chiller 4 is absorbed by the cold water from the cooling tower 5, and then enters the cooling tower 5 through the second water outlet pipeline of the chiller and the cooling tower circulation pipeline. Finally, the cooling tower 5 discharges the excess heat to the outside and then conducts the next cycle. The water flow rates in the first water inlet and outlet pipelines of the chiller and the cooling tower circulation pipeline are determined by the operating frequency of the chiller 4.

[0050] In summary, for a test method of a water-cooled chiller performance detection system, the phase change regulating subsystem IV can be used to quickly reach the experimental conditions required for testing before the experiment starts, and then switch to the heat and cold quantity exchange subsystem III for testing. This not only improves the test efficiency but also improves the energy utilization rate.

Claims

1. A performance detection system for a water-cooled chiller, the system comprising a heat test subsystem (I) for testing the performance of the water-cooled chiller, a cooling capacity test subsystem (II), a heat and cooling capacity exchange subsystem (III), and a phase change regulation subsystem (IV), characterized in that: The heat test subsystem (I) and the cold test subsystem (II) are connected through a mixing water pipeline for heat exchange; the heat test subsystem (I) is connected to the heat and cold exchange system (III) or the phase change regulation subsystem (IV) through a constant temperature water tank (3), and the excess heat is discharged to the outdoor through a cooling tower (5).

2. The performance detection system of a water-cooled chiller according to claim 1, characterized in that: The heat test subsystem (I) includes: a cooling water circulation pipeline and a cooling water mixing pipeline; a first cooling water thermometer (T1), a second cooling water thermometer (T2), a third cooling water thermometer (T6), a first cooling water pressure gauge (P1), a second cooling water pressure gauge (P2), a first cooling water valve (7), a cooling water flowmeter (8), a cooling water pump (9), and a second cooling water valve (10) are installed on the cooling water circulation pipeline; the first cooling water thermometer (T1) and the first cooling water pressure gauge (P1) are both arranged on the water inlet pipeline close to the condenser (1) of the machine under test; the second cooling water thermometer (T2) and the second cooling water pressure gauge (P2) are both arranged on the water outlet pipeline close to the condenser (1) of the machine under test; the third cooling water thermometer (T6) is arranged on the pipeline after the confluence point of the cooling water mixing pipeline and the water outlet pipeline from the cooling water pump (9); the water outlet end of the condenser (1) of the machine under test in the cooling water circulation pipeline is communicated with the water inlet end of the second cooling water valve (10); the water outlet end of the second cooling water valve (10) forms three branches. Branch ① serves as the hot water side inlet pipeline of the heat exchanger, branch ② serves as the inlet pipeline of the chilled water mixing pipeline, and branch ③ serves as the cooling water circulation pipeline; the branch ③ pipeline at the water outlet end of the second cooling water valve (10) converges with the branch ④ pipeline at the water outlet end of the first chilled water valve (14), and after convergence, it flows into the water inlet end of the cooling water pump (9); the water outlet end pipeline of the cooling water pump (9) converges with the cooling water mixing pipeline to form the inlet pipeline of the cooling water; the converged cooling water inlet pipeline flows into the water inlet end of the cooling water flowmeter (8); the water outlet end of the cooling water flowmeter (8) is communicated with the water inlet end of the first cooling water valve (7); the water outlet end of the first cooling water valve (7) is communicated with the water inlet end of the condenser (1) of the machine under test; The cooling water mixing pipeline includes a constant temperature water tank (3), a first cooling water mixing pipeline valve (11), a cooling water mixing pump (12), and a second cooling water mixing pipeline valve (13); the constant temperature water tank includes: an electric heating device (36) and a constant temperature water tank thermometer (T8); the a water outlet end of the constant temperature water tank (3) is communicated with the water inlet end of the first cooling water mixing pipeline valve (11); the water outlet end of the first cooling water mixing pipeline valve (11) is connected to the water inlet end of the cooling water mixing pump (12); the water outlet end of the cooling water mixing pump (12) is communicated with the water inlet end of the second cooling water mixing pipeline valve (13); the water outlet end pipeline of the second cooling water mixing pipeline valve (13) converges with the water outlet end pipeline of the cooling water pump (9), and after convergence, it serves as the inlet pipeline of the cooling water.

3. A performance detection system for a water-cooled chiller according to claim 1, characterized in that: The shown cooling capacity test subsystem (II) includes a chilled water circulation pipeline and a chilled water mixing pipeline; the chilled water circulation pipeline includes a first chilled water thermometer (T3), a second chilled water thermometer (T4), a third chilled water thermometer (T5), a first chilled water pressure gauge (P3), a second chilled water pressure gauge (P4), a first chilled water valve (14), a chilled water pump (18), a chilled water flowmeter (20), a second chilled water valve (19), and a third chilled water valve (21); the first chilled water thermometer (T3) and the first chilled water pressure gauge (P3) are arranged on the water outlet pipeline near the evaporator (2) of the machine under test; the second chilled water thermometer (T4) and the second chilled water pressure gauge 2 (P4) are arranged on the water inlet pipeline near the evaporator (2) of the machine under test; the third chilled water thermometer (T5) is arranged on the chilled water circulation pipeline after the convergence of the chilled water mixing pipeline and the water outlet pipeline of the chilled water pump (18); the water outlet end of the evaporator (2) of the machine under test in the chilled water circulation pipeline is communicated with the water inlet end of the second chilled water valve (19); the water outlet end of the second chilled water valve (19) forms two branches, the ④ branch is used as the chilled water outlet pipe, and the ⑤ branch is used as the chilled water circulation pipeline; the ④ branch flows into the water inlet end of the first chilled water valve (14); the water outlet pipeline of the first chilled water valve (14) converges with the cooling water circulation pipeline ③; the ⑤ branch flows into the water inlet end of the chilled water pump (18); the water outlet pipeline of the chilled water pump (18) converges with the chilled water mixing pipeline and then flows into the water inlet end of the chilled water flowmeter (20); the water outlet end of the chilled water flowmeter (20) is communicated with the water inlet end of the third chilled water valve (21); the water outlet end of the third chilled water valve (21) is communicated with the water inlet end of the evaporator (2) of the machine under test; A first chilled water mixing pipeline valve (15), a chilled water mixing pump (17), and a second chilled water mixing pipeline valve (16) are installed on the chilled water mixing pipeline; the ② branch flows into the water inlet end of the first chilled water mixing pipeline valve (15) as the water inlet pipeline of the chilled water mixing pipeline; the water outlet end of the first chilled water mixing pipeline valve (15) is communicated with the water inlet end of the chilled water mixing pump (17); the water outlet end of the chilled water mixing pump (17) is communicated with the water inlet end of the second chilled water mixing pipeline valve (16); the water outlet pipeline of the second chilled water mixing pipeline valve (16) converges with the water outlet pipeline of the chilled water pump (19), and the converged pipeline is used as the water inlet pipeline of the chilled water.

4. A performance detection system for a water-cooled chiller according to claim 1, characterized in that: The heat and cold quantity exchange subsystem (III) includes: a heat exchanger (6), a constant temperature water tank (3), a cooling tower (5), a first heat exchanger valve (28), a second heat exchanger valve (29), a third heat exchanger valve (30), a fourth heat exchanger valve (31), a flowmeter (32) for the cooling tower circulation pipeline, a water pump (33) for the cooling tower circulation pipeline, a first valve (34) for the cooling tower circulation pipeline, a second valve (35) for the cooling tower circulation pipeline, a first thermometer (T7) for the cooling tower circulation pipeline, and a first pressure gauge (P7) for the cooling tower circulation pipeline; the first thermometer (T7) and the first pressure gauge (P7) for the cooling tower circulation pipeline are arranged on the cooling tower circulation pipeline between the water pump (33) for the cooling tower circulation pipeline and the flowmeter (32) for the cooling tower circulation pipeline; the ① branch flows into the water inlet end of the fourth heat exchanger valve (31) as the hot water side inlet pipeline of the heat exchanger; the water outlet end of the fourth heat exchanger valve (31) is communicated with the hot water inlet end of the heat exchanger (6)a; the hot water outlet end of the heat exchanger (6)b is communicated with the water inlet end of the second heat exchanger valve (29); the water outlet end of the second heat exchanger valve (29) is communicated with the water inlet end of the constant temperature water tank (3)b; the cold water side inlet pipeline of the heat exchanger flows out from the cooling tower (5); the water outlet end of the cooling tower (5) is communicated with the water inlet end of the first valve (34) for the cooling tower side circulation pipeline; the water outlet end of the first valve (34) for the cooling tower circulation pipeline is communicated with the water inlet end of the water pump (33) for the cooling tower circulation pipeline; the water outlet end of the water pump (33) for the cooling tower circulation pipeline is communicated with the water inlet end of the flowmeter (32) for the cooling tower circulation pipeline; the water outlet end of the flowmeter (32) for the cooling tower circulation pipeline is communicated with the water inlet end of the first heat exchanger valve (28); the water outlet end of the first heat exchanger valve (28) is communicated with the cold water inlet end of the heat exchanger (6)c; the cold water outlet end of the heat exchanger (6)d is communicated with the water inlet end of the third heat exchanger valve (30); the water outlet end of the third heat exchanger valve (30) belonging to the heat exchanger is communicated with the water inlet end of the second valve (35) for the cooling tower circulation pipeline; the water outlet end of the second valve (35) for the cooling tower circulation pipeline is communicated with the water inlet end of the cooling tower (5) side.

5. The phase change regulating subsystem (IV) includes: Constant temperature water tank (3), chiller (4), cooling tower (5), first valve of the first water inlet pipeline of the chiller (22), water pump of the first water inlet pipeline of the chiller (23), second valve of the first water inlet pipeline of the chiller (24), third valve of the first water outlet pipeline of the chiller (25), fourth valve of the second water inlet pipeline of the chiller (26), fifth valve of the second water outlet pipeline of the chiller (27), flowmeter of the cooling tower circulation pipeline (32), water pump of the cooling tower circulation pipeline (33), first valve of the cooling tower circulation pipeline (34), second valve of the cooling tower circulation pipeline (35), first thermometer (T7) of the cooling tower circulation pipeline, first pressure gauge (P7) of the cooling tower circulation pipeline; the water inlet end of the first water inlet pipeline of the chiller flows out from the water outlet end of the constant temperature water tank (3); the water outlet end of the constant temperature water tank (3) is communicated with the water inlet end of the second valve (24) of the first water inlet pipeline of the chiller; the water outlet end of the second valve (24) of the first water inlet pipeline of the chiller is communicated with the water inlet end of the water pump (23) of the first water inlet pipeline of the chiller; the water outlet end of the water pump (23) of the first water inlet pipeline of the chiller is connected to the water inlet end of the first valve (22) of the water inlet pipeline on the chiller side; the water outlet end of the first valve (22) of the first water inlet pipeline of the chiller is connected to the water inlet end of the chiller (4)a; the water outlet end of the chiller (4)b is connected to the water inlet end of the third valve (25) of the first water outlet pipeline of the chiller; the water outlet end of the third valve (25) of the first water outlet pipeline of the chiller is connected to the water inlet end of the constant temperature water tank (3)d; the water inlet end of the second water inlet pipeline of the chiller flows out from the water outlet end of the cooling tower (5); the water outlet end of the cooling tower (5) is communicated with the water inlet end of the first valve (34) of the side circulation pipeline of the cooling tower; the water outlet end of the first valve (34) of the cooling tower circulation pipeline is connected to the water inlet end of the water pump (33) of the cooling tower circulation pipeline; the water outlet end of the water pump (33) of the cooling tower circulation pipeline is connected to the water inlet end of the flowmeter (32) of the cooling tower circulation pipeline; the water outlet end of the flowmeter (32) of the cooling tower circulation pipeline is connected to the water inlet end of the fourth valve (26) of the second water inlet pipeline of the chiller; the water outlet end of the fourth valve (26) of the second water inlet pipeline of the chiller is connected to the water inlet end of the chiller (4)c; the water outlet end of the chiller (4)d is connected to the water inlet end of the fifth valve (27) of the second water outlet pipeline of the chiller; the water outlet end of the fifth valve (27) of the second water outlet pipeline of the chiller is connected to the water inlet end of the second valve (35) of the cooling tower circulation pipeline; the water outlet end of the second valve (35) of the cooling tower circulation pipeline is connected to the water inlet end on the cooling tower side.

6. A performance detection system for a water-cooled chiller according to claims 1 to 5, characterized in that: The ④ branch at the water outlet end of the second chilled water valve (19) is mixed with the ③ branch from the water outlet end of the second cooling water valve (10), thereby reducing the outlet water temperature of the cooling water; the outlet pipe of the cooling water pump (9) is further mixed with the cooling water mixing pipe to further reduce the temperature of the cooling water as the inlet water of the cooling water; the pipeline at the water outlet end of the chilled water pump (18) is mixed with the chilled water mixing pipe to increase the inlet water temperature of the chilled water as the inlet water of the chilled water.

7. The performance detection system for a water-cooled chiller according to claims 1 to 5, characterized in that: When the heat exchanger (6) is started, the hot water in the ① branch pipeline exchanges heat with the cold water from the cooling tower (5), thereby reducing the outlet water temperature of the hot water in the heat exchanger. The cooled hot water enters the constant temperature water tank to maintain the temperature in the constant temperature water tank, and the heated cold water returns to the cooling tower (5) for cooling.

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