Dual circuit enthalpy difference laboratory for industrial chiller

Abstract

The application discloses a kind of enthalpy difference laboratory for double-loop industrial cooler, including indoor test room and outdoor test room, the indoor test room is equipped with waterway testing device and oilway testing device, the outdoor test room includes two independent mobile test tool, wherein first mobile test tool is communicated with the waterway testing device by pipeline and quick connector, and second mobile test tool is communicated with the oilway testing device by pipeline and quick connector.The enthalpy difference laboratory designed in the application includes water cooling and oil cooling double-loop testing device, compared with testing by using air handling unit to simulate oil cooling or water cooling of industrial cooler, it is closer to actual working condition, and more accurate.

Description

Technical Field

[0001] This invention relates to the field of air conditioning testing technology, and in particular to an enthalpy difference laboratory for a dual-loop industrial cooler. Background Technology

[0002] The air enthalpy difference method and the room-type calorimeter method are two commonly used methods for testing the cooling and heating performance of heat pump air conditioners. Compared with the room-type calorimeter method, the air enthalpy difference method has the advantages of simpler testing, shorter time required to reach equilibrium, and lower equipment investment, making it the most common testing method among air conditioner manufacturers and testing institutions. The working principle of an air enthalpy difference laboratory is to simulate various temperature and humidity environments using an air handling unit, while simultaneously testing various performance parameters of the air conditioner, including cooling capacity, heating capacity, low-temperature unsteady-state heating capacity, power consumption, COP, EER, and seasonal energy consumption efficiency of the circulating air volume. The cooling capacity (heating capacity) is determined by measuring the outlet air parameters, inlet air parameters, and circulating air volume of the indoor heat pump air conditioner; that is, the product of the measured air volume and the enthalpy difference between the outlet and inlet air is used to determine the air conditioner's cooling capacity (heating capacity).

[0003] Industrial chillers typically use liquids as the cooling medium, such as oil or water. However, test results simulating oil or water cooling using air handling units are not accurate enough as they may differ from actual cooling capacity and performance parameters. Summary of the Invention

[0004] This invention proposes an enthalpy difference laboratory for dual-loop industrial coolers to solve the technical problem of inaccurate test results in the prior art of using air handling units to simulate industrial coolers for testing cooling capacity and performance parameters.

[0005] This invention proposes an enthalpy difference laboratory for a dual-loop industrial cooler, comprising an indoor testing room and an outdoor testing room. The indoor testing room is equipped with a water circuit testing device and an oil circuit testing device. The outdoor testing room includes two independent mobile testing fixtures, wherein the first mobile testing fixture is connected to the water circuit testing device via a pipeline, and the second mobile testing fixture is connected to the oil circuit testing device via a pipeline.

[0006] Preferably, the water circuit testing device includes a water tank, which forms a heat exchange cycle with the evaporator of the water-cooled unit under test through pipes and a first water pump, and forms a water-cooling testing cycle with the first movable testing fixture through pipes and a second water pump; the oil circuit testing device includes at least one oil tank, which forms a heat exchange cycle with the evaporator of the oil-cooled unit under test through pipes and a first oil pump, and forms an oil-cooling testing cycle with the second movable testing fixture through pipes and a second oil pump.

[0007] Preferably, the first mobile testing fixture includes a flow detection device, a water resistance tester, a temperature-controlled electric heater, and a water storage tank connected in sequence through a pipeline, with quick connectors and temperature sensors respectively provided at the inlet and outlet positions at both ends of the pipeline.

[0008] Preferably, in the first mobile testing fixture, the flow detection device uses two flow meters connected in parallel with different measuring ranges, one large and one small, and each flow meter is equipped with a solenoid valve at its front end.

[0009] Furthermore, in the first mobile testing fixture, the front end of the temperature-controlled electric heater is also provided with a water supply and extraction port.

[0010] Preferably, the second mobile testing fixture includes a flow detection device, an oil resistance tester, and a temperature-controlled electric heater connected in sequence through a pipeline, with quick connectors and temperature sensors respectively provided at the inlet and outlet positions at both ends of the pipeline.

[0011] Preferably, both the water tank and the oil tank are equipped with temperature-compensated electric heaters.

[0012] Preferably, the oil circuit testing device includes three oil tanks, each corresponding to a different type of oil test.

[0013] Preferably, the water tank is provided with a water inlet and a drain outlet; the oil tank is provided with an oil inlet and an oil drain outlet.

[0014] Preferably, the water circuit testing device and the oil circuit testing device are connected to the unit under test through pipes and quick connectors.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The enthalpy difference laboratory designed in this invention uses a dual-loop system of water cooling or oil cooling to test industrial coolers. Compared with the test using an air handling unit to simulate oil cooling or water cooling, it is closer to the actual working conditions and has higher accuracy. Moreover, the test using a fluid medium only requires measuring the flow rate and temperature difference, making the operation simpler.

[0017] 2. The present invention places two sets of mobile testing fixtures in an outdoor environment simulation space, which can be used to test two units simultaneously in one simulation environment, thereby reducing energy consumption.

[0018] 3. This invention provides both water cooling and oil cooling testing fixtures in the indoor space, meeting the testing requirements of different industrial coolers and exhibiting strong adaptability.

[0019] 4. The indoor water tank and oil tank, as well as the compensation electric heater installed inside them, not only play a buffering role, but also ensure stable test conditions and accurate test results. Attached Figure Description

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the enthalpy difference laboratory water testing system designed in this invention;

[0022] Figure 2 This is a schematic diagram of the enthalpy difference laboratory oil testing system designed in this invention;

[0023] Figure 3 This is a schematic diagram of the first movable test fixture of the present invention;

[0024] Figure 4 This is a schematic diagram of the second mobile testing fixture of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the invention and do not constitute a limitation thereof.

[0026] The innovation of this invention lies in the following: using a liquid medium to test the test unit through temperature and flow rate, the test results are real and reliable; setting up a dual-loop test system only requires simulating one working condition to test multiple industrial cooling units simultaneously, reducing energy consumption.

[0027] The enthalpy difference laboratory proposed in this invention comprises two test chambers, one serving as the outdoor side and the other as the indoor side, simulating the outdoor and indoor environments under test for the oil-cooled / water-cooled chiller units. To meet the operating requirements of the tested air conditioner, the test units in both chambers must operate simultaneously. The test loop is specifically designed for machine tool chillers or oil-cooled chillers, more effectively and accurately simulating the actual operating conditions of different tested units, resulting in more accurate and reliable test results.

[0028] The working principle of this invention is as follows:

[0029] The performance tests in the enthalpy difference laboratory primarily assess the cooling capacity of machine tool coolers. Cooling capacity is a crucial indicator of a cooler's performance. The common method for testing cooling capacity is the temperature difference method. This method involves measuring the mass m of the cooled liquid, the temperature drop Δt, and the cooling time τ, then calculating the cooling capacity based on its specific heat capacity c: Q = cmΔt / τ. In contrast, the fluid medium enthalpy difference laboratory tests the volumetric flow rate V and temperature drop Δt of the cooling medium, calculating the cooling capacity based on its specific heat capacity c and density ρ: Q = ρcVΔt. This method does not require knowledge of the cooled liquid's mass or cooling time; only the cooler's flow rate and temperature difference are needed to determine the cooling capacity. This invention designs a testing fixture and detection device based on this principle.

[0030] The enthalpy difference laboratory's test chamber is constructed with cold storage panels. Considering installation, handling, and testing needs, its size should not be too large, and it should minimize disruption to the normal air circulation field of the unit under test. The indoor test chamber includes: an oil / water tank, water / oil pump, heating system, electrical control system, piping, protection system, and quick connectors for connecting to the unit under test. The outdoor test chamber needs to simulate various outdoor environmental conditions. The air handling process mainly includes cooling and dehumidification, heating and humidification, and air supply. Simultaneously, the indoor test chamber needs to monitor temperature changes during the testing process, possessing automatic alarm functions, detecting cooling effects, monitoring cooling accuracy, and overseeing the testing process. Automated devices replace manual judgment, effectively reducing costs, increasing efficiency, and implementing mistake-proofing control.

[0031] The testing device includes flow meters, pumps, platinum resistance thermometers, high and low pressure sensors, etc., and mainly detects the temperature and flow rate of the cooling medium at the inlet and outlet of the machine under test, as well as the current and power of the electric heating compensation device.

[0032] An enthalpy difference laboratory typically includes an indoor testing room and an outdoor testing room. The indoor testing room is equipped with a device for quick connection to the cooling unit under test, a control cabinet, refrigeration system piping, water distribution system, electrical wiring, cooling and water supply / drainage systems, a computer system, etc.; the outdoor testing room is equipped with an air reprocessing unit, a humidifier / heater, an airflow testing device, measuring instruments, etc. These are not improvements of this invention and will not be described in detail here.

[0033] Figure 1 This is a schematic diagram of the water testing system for the enthalpy difference laboratory of a dual-loop industrial cooler proposed in this invention. The left side is the indoor testing room, and the right side is the outdoor testing room. The indoor testing room is equipped with a water circuit testing device and an oil circuit testing device. The outdoor testing room includes two independent mobile testing fixtures. The first mobile testing fixture is connected to the water circuit testing device via a pipeline, and the second mobile testing fixture is connected to the oil circuit testing device via a pipeline. The water circuit testing device includes a water tank, which forms a heat exchange cycle with the evaporator of the water-cooled unit under test via a pipeline and a first water pump. Simultaneously, it forms a water-cooling testing cycle with the first mobile testing fixture via a pipeline and a second water pump. The oil circuit testing device includes at least one oil tank, which forms a heat exchange cycle with the evaporator of the oil-cooled unit under test via a pipeline and a first oil pump. It forms an oil-cooling testing cycle with the second mobile testing fixture via a pipeline and a second oil pump.

[0034] The water circuit testing device located in the indoor testing room includes a water tank 1. The water tank forms a heat exchange cycle with the evaporator of the water-cooled unit 3 under test through pipes and a first water pump 2. Simultaneously, it forms a water-cooling testing cycle with a first mobile testing fixture located in the outdoor testing room through pipes and a second water pump 4. The water tank 1 is equipped with a temperature compensation electric heater 5 to compensate for the temperature loss from the water tank. The water tank also has a water inlet 6 and a drain outlet 7.

[0035] like Figure 3 As shown, the first mobile testing fixture, located in the outdoor testing room, includes a flow detection device 8, a water resistance tester 9, a temperature-controlled electric heater 10, and a water storage tank 11 connected in sequence via pipelines. Temperature sensors 12 are installed at the inlet and outlet positions at both ends of the pipelines. In this embodiment, the temperature sensors 12 are platinum resistance thermometers. The flow detection device 8 includes two high-precision electronic flow meters, one large and one small, connected in parallel. Solenoid valves are installed at the front ends of the two flow meters. The flow meters are selected based on the testing accuracy; a large-flow-rate flow meter is used when the flow rate is high, and a small-flow-rate flow meter is used when the flow rate is low, in order to improve the detection accuracy.

[0036] During the test, a platinum resistance thermometer is used to collect the inlet and outlet water temperatures. A flow detection device 8 and a water resistance tester 9 are used to test the flow rate in the system (the flow detection device includes two flow meters with different ranges, selected according to the test accuracy) and the water resistance. Then, the cooling capacity of the chiller unit under test can be calculated according to the above calculation formula.

[0037] The first mobile testing fixture's pipeline is also equipped with an air vent valve 13 and a water supply and extraction port 14. The water testing system and the first mobile testing fixture are capable of operating independently.

[0038] like Figure 2 As shown, the oil circuit testing device located in the indoor testing room includes at least one oil tank 41. In this embodiment, three oil tanks are included, each corresponding to a different type of oil for testing. The oil tanks form a heat exchange cycle with the evaporator of the oil-cooled unit 40 under test via pipes and a first oil pump 42. Simultaneously, they form an oil-cooling test cycle with a second mobile testing fixture in the outdoor testing room via pipes and a second oil pump 43. A temperature-compensating electric heater 44 is installed inside the oil tank 41 to compensate for the temperature inside the tank. The oil tank also has an oil filler port 45 and an oil drain port 46.

[0039] like Figure 4 As shown, the second mobile testing fixture includes a flow detection device 8, an oil resistance tester 20, and a temperature-controlled electric heater 10 connected in sequence via pipelines. Quick connectors and temperature sensors 12 are respectively installed at the inlet and outlet positions at both ends of the pipeline. In this embodiment, a platinum resistance thermometer is also used as the temperature sensor.

[0040] During testing, platinum resistance thermometers are used to collect the oil temperatures at the inlet and outlet. A flow monitoring device 8 and an oil resistance tester 20 are used to measure the flow rate and oil resistance in the system. Then, the cooling capacity of the unit under test can be calculated using the aforementioned formula. The oil circuit testing system and the second mobile testing fixture are capable of operating independently.

[0041] The enthalpy difference laboratory proposed in this invention has a detection range of 1000-15000W. To facilitate modification and relocation with the production line, the electric heating device is designed as an integral unit with load-bearing wheels at the bottom, making the whole unit easy to move.

[0042] The temperature compensation electric heater 5 in the water tank and oil tank has a power of 12kW and can automatically control and compensate for the heat lost from the water tank / oil tank.

[0043] The temperature-controlled electric heater 10 can be a tubular electric heater with externally wound fins, equipped with a reliable grounding device, and interlocked with the fan. For load regulation, the electric heater is controlled in two stages: the first stage is fixed; the second stage uses a thyristor to control the heating power.

[0044] The outdoor test chamber can be humidified by electric heating. The electric humidification nozzle in the air conditioning unit can supply steam to the air handling unit in the test chamber. The humidification amount can be adjusted by regulating the heating power through the silicon controlled rectifier, so as to meet the air supply parameters under different operating conditions around the clock and thus control the temperature and humidity in the outdoor test chamber.

[0045] The enthalpy difference laboratory designed in this invention uses water cooling or oil cooling to test industrial cooling units. Compared with the test using air handling units to simulate oil cooling or water cooling, it is closer to the actual working conditions and has higher accuracy. Moreover, the fluid test only requires measuring flow rate and temperature difference, making the operation simpler.

[0046] The enthalpy difference laboratory proposed in this invention is equipped with quick connectors, allowing for rapid assembly and disassembly of the tested unit. It is easy to install and connect with mobile testing fixtures, including pipelines, circuits, and sensors. It is simple, convenient, and highly automated, with a user-friendly interface and real-time display of test data. Furthermore, the integrated structure design of the electric heating fixture facilitates relocation and can meet various combined testing requirements.

[0047] The enthalpy difference laboratory designed in this invention has temperature protection and automatic alarm functions. When the temperature is abnormal during the test operation of the device, it will automatically alarm, reducing human judgment errors and labor costs.

[0048] The enthalpy difference laboratory designed in this invention can simultaneously test two products with a cooling capacity of less than 15000W. The connectors are easy to install quickly and have good airtightness.

[0049] The enthalpy difference laboratory designed in this invention can display the performance and reliability of the test requirements. The change value can be used to determine whether the performance and reliability of the tested device meet the product technical requirements. It is convenient to quantify the data to analyze the performance and reliability of the tested object, and the data is synchronized to the inspection record for subsequent traceability.

[0050] The enthalpy difference laboratory designed in this invention has performance and reliability monitoring functions. If the performance does not meet the set requirements during the test, the device will automatically remind and record the results for query.

[0051] The above description is merely a specific embodiment of the present invention. It should be noted that any modifications, equivalent substitutions, and variations made within the spirit and framework of the present invention should be included within the protection scope of the present invention.

Claims

1. An enthalpy difference laboratory for a dual-loop industrial cooler, comprising an indoor testing room and an outdoor testing room, characterized in that, The indoor testing room is equipped with a water circuit testing device and an oil circuit testing device. The outdoor testing room includes two independent mobile testing fixtures. The first mobile testing fixture is connected to the water circuit testing device via pipes and quick connectors, and the second mobile testing fixture is connected to the oil circuit testing device via pipes and quick connectors. The water circuit testing device includes a water tank, which forms a heat exchange cycle with the evaporator of the water-cooled unit under test via pipes and a first water pump. Simultaneously, it forms a water-cooling testing cycle with the first mobile testing fixture via pipes and a second water pump. The oil circuit testing device includes at least one oil tank, which forms a heat exchange cycle with the evaporator of the oil-cooled unit under test via pipes and a first oil pump. It forms an oil-cooling testing cycle with the second mobile testing fixture via pipes and a second oil pump.

2. The enthalpy difference laboratory as described in claim 1, characterized in that, The first mobile testing fixture includes a flow detection device, a water resistance tester, a temperature-controlled electric heater, and a water storage tank connected in sequence through a pipeline. Quick connectors and temperature sensors are respectively provided at the inlet and outlet positions at both ends of the pipeline.

3. The enthalpy difference laboratory as described in claim 2, characterized in that, The flow detection device uses two flow meters connected in parallel with different measuring ranges, one large and one small. Each flow meter is equipped with a solenoid valve at its front end.

4. The enthalpy difference laboratory as described in claim 2, characterized in that, The front end of the temperature-controlled electric heater is also equipped with a water supply and extraction port.

5. The enthalpy difference laboratory as described in claim 1, characterized in that, The second mobile testing fixture includes a flow detection device, an oil resistance tester, and a temperature-controlled electric heater connected in sequence through a pipeline. Quick connectors and temperature sensors are respectively provided at the inlet and outlet positions at both ends of the pipeline.

6. The enthalpy difference laboratory as described in claim 1, characterized in that, Both the water tank and the oil tank are equipped with temperature-compensated electric heaters.

7. The enthalpy difference laboratory as described in claim 1, characterized in that, The oil circuit testing device includes three oil tanks, each corresponding to a different type of oil for testing.

8. The enthalpy difference laboratory as described in claim 1, characterized in that, The water tank is equipped with a water inlet and a drain outlet; the oil tank is equipped with an oil inlet and an oil drain outlet.

9. The enthalpy difference laboratory as described in claim 1, characterized in that, The water circuit testing device and the oil circuit testing device are connected to the unit under test through pipes and quick connectors.

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