CN110671869B - Variable working condition energy efficiency test system of cold water supply system and application thereof - Google Patents
Variable working condition energy efficiency test system of cold water supply system and application thereof Download PDFInfo
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- CN110671869B CN110671869B CN201911049600.6A CN201911049600A CN110671869B CN 110671869 B CN110671869 B CN 110671869B CN 201911049600 A CN201911049600 A CN 201911049600A CN 110671869 B CN110671869 B CN 110671869B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 334
- 238000012360 testing method Methods 0.000 title claims abstract description 49
- 239000000498 cooling water Substances 0.000 claims abstract description 102
- 238000001816 cooling Methods 0.000 claims description 87
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
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- 239000002699 waste material Substances 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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Abstract
The invention relates to a variable working condition energy efficiency test system of a cold water supply system, which comprises a cold water supply device and a cooling water supply device; according to the invention, the flowmeter, the temperature sensor and the plate heat exchanger are additionally arranged between the cold water supply device and the cooling water supply device, the cooling water in the cooling water reservoir and the cold water of the water chilling unit exchange heat through the plate heat exchanger, and the refrigerating capacity of the water chilling unit is obtained by measuring the cold-proof capacity of the plate heat exchanger, so that the energy efficiency of the water chilling unit is accurately tested. Compared with the prior art, the invention has the advantages of energy conservation, convenient construction, accurate measurement, low running cost and the like.
Description
Technical Field
The invention relates to the technical field of energy, in particular to a variable working condition energy efficiency test system of a cold water supply system and application thereof.
Background
In industrial production and life, air conditioning and cold water for process are gradually changed into indispensable energy sources. The industrial cold water system mainly comprises a cold and heat source (a cold water unit), a pipeline, a cooling tower, a water pump and terminal equipment. For users, the stability of stable operation and energy supply of the equipment is important, but the economy of operation of the cold water system is easy to ignore.
Along with the progress of science and technology, people's energy-conserving consciousness has improved gradually, and cold water system's whole energy consumption statistics has had comparatively mature scheme, and more cold water systems have supporting the platform of energy efficiency control, have recorded and analyzed the whole energy efficiency and the energy consumption in refrigeration station room. However, the general energy consumption monitoring system is only biased to the whole energy consumption, the energy efficiency test and application of a single device are not perfect, and meanwhile, the energy efficiency of the variable working condition operation of the cold water system is not paid enough attention.
The energy efficiency of the cold water system running under different loads and working conditions is very different. However, for system users, the cold water system design basically does not have the condition of variable working condition energy efficiency test, and the design institute and manufacturer can not provide detailed test data. When the water supply is carried out, the flow temperature difference and other data of the water supply main pipe are used for testing, the external heat load is difficult to adjust and stabilize, the whole system is huge, the corresponding speed of the temperature is low, the testing result is often unsatisfactory, and the guiding significance for practical application is lacking.
Disclosure of Invention
The invention aims to overcome the defect of inaccurate energy efficiency test of a water chilling unit in the prior art and provides a stable and accurate variable-working-condition energy efficiency test system of a cold water supply system and application thereof.
The aim of the invention can be achieved by the following technical scheme:
a variable working condition energy efficiency test system of a cold water supply system comprises a cold water supply device and a cooling water supply device; the cold water supply device comprises a water collector, a variable-frequency cold water pump and a cold water unit which are connected with workshop cold water backwater through pipelines in sequence, wherein the cold water output end of the cold water unit is connected with a workshop cold water supply pipeline, a first switching valve is arranged on a pipeline between the workshop cold water backwater and the variable-frequency cold water pump, and a second switching valve is arranged on a pipeline between the cold water output end of the cold water unit and the workshop cold water supply pipeline; the cooling water supply device comprises a first cooling tower, a cooling water reservoir connected with the output end of the first cooling tower, and the output end of the cooling water reservoir is connected with the cooling water input end of the water chilling unit through a variable-frequency cooling pump, and the cooling water output end of the water chilling unit is connected with the first cooling tower;
the device also comprises a heat exchanger, and the cooling water supply device also comprises a second cooling tower, the output end of which is connected with the cooling water reservoir, and a variable-frequency cooling pump group, the input end of which is connected with the cooling water reservoir;
the cold water output end of the water chilling unit is connected with the water collector through a circulating pipeline, a third switching valve is arranged on the circulating pipeline, and a fourth switching valve is arranged between the third switching valve and the water collector; the cold water inlet and the cold water outlet of the heat exchanger are connected with a circulating pipeline and are connected with the third switching valve in parallel;
the cooling water inlet of the heat exchanger is connected with the variable-frequency cooling pump set, and cooling water coming out of the cooling water outlet of the heat exchanger returns to the cooling water reservoir;
a cold water inlet pipeline and a cold water outlet pipeline of the heat exchanger are respectively provided with a first temperature sensor and a second temperature sensor; a flowmeter is arranged on the circulating pipeline; and the water chilling unit is provided with an electric quantity meter.
And a cooling water outlet of the heat exchanger is connected with a second cooling tower.
The heat exchanger is a plate heat exchanger.
The first switching valve, the second switching valve and the fourth switching valve are electric valves; the third switching valve is a manual valve.
The cold water supply device is provided with a plurality of sleeves, and the sleeves of cold water supply devices are connected in parallel; each set of cold water supply device is respectively matched with one set of first cooling tower and variable-frequency cooling pump.
The plurality of sets of cold water supply devices share a water collector.
The cold water supply device is provided with two sets.
And the cooling water outlet pipeline and the cooling water inlet pipeline of the heat exchanger are connected with a cooling water conveying pipeline for conveying cooling water to external water equipment.
The flowmeter is an electromagnetic flowmeter.
The fan motor of the cooling tower is a variable frequency motor.
The electric equipment in the variable working condition energy efficiency test system is respectively provided with an electric quantity meter.
The invention also provides application of the variable working condition energy efficiency testing system of the cold water supply system in testing the energy efficiency of the cold water unit, comprising the following steps:
(a) Closing the first switching valve, the second switching valve and the third switching valve, and closing the fourth switching valve;
(b) Starting a water chilling unit and a variable-frequency cold water pump of the cold water supply device to be tested, and enabling cooling water output by the variable-frequency cold water pump and cold water output by the water chilling unit to exchange heat in a heat exchanger by the aid of a first cooling tower, the variable-frequency cold water pump, a second cooling tower and the variable-frequency cold water pump which are matched with the cold water supply device to be tested;
(c) Measuring the temperatures of a cold water inlet and a cold water outlet of the heat exchanger through a first temperature sensor and a second temperature sensor, measuring the flow of cold water in the water chilling unit through a flowmeter, and calculating to obtain the cooling capacity Q of the heat exchanger, wherein the cooling capacity Q is the refrigerating capacity of the water chilling unit; calculating according to the power consumption W of the water chilling unit and the cooling capacity Q to obtain the energy efficiency of the water chilling unit;
(d) Energy efficiency test under different working conditions
The heat load of the cold water supply device is regulated by regulating the frequency of the variable-frequency cooling pump set, the step (c) is repeated, and the energy efficiency of the cold water unit under different heat loads is tested;
the method comprises the steps of (c) repeating the step of (c) and measuring the energy efficiency of a water chilling unit under different cooling water temperature conditions by adjusting the motor frequency of a first variable-frequency cooling tower and a second variable-frequency cooling tower and the temperature of a cooling water reservoir by opening and closing the motor;
adjusting the cooling water flow of the water chilling unit by adjusting the frequency of the variable-frequency cooling pump, repeating the step (c), and measuring the energy efficiency of the water chilling unit under different cooling water flow conditions;
the cold water flow of the water chilling unit is regulated by regulating the frequency of the variable-frequency cold water pump, the step (c) is repeated, and the energy efficiency of the water chilling unit under different cold water flow conditions is measured;
and (c) repeating the step (c) by adjusting the set temperature change of the cold water outlet of the cold water unit, and measuring the energy efficiency of the cold water unit under different set temperatures of the evaporator outlets of the cold water unit.
The working principle of the invention is as follows:
when the system normally operates, the first switching valve and the second switching valve are opened, the fourth switching valve is closed, the variable-frequency cold water pump, the water chilling unit, the first cooling tower and the second cooling tower are started, at the moment, the cold water supply device and the cooling water supply device start to operate, cold water is supplied to workshops, and water is supplied to other cooling water consuming devices.
When the energy efficiency of the water chiller needs to be tested, disconnecting the cold water supply device from the workshop system, closing the first switching valve, the second switching valve and the third switching valve, and opening the fourth switching valve; the method comprises the steps of starting a water chilling unit and a variable-frequency cold water pump of a cold water supply device to be tested, and enabling cooling water output by the variable-frequency cold water pump and cold water output by the water chilling unit to exchange heat in a heat exchanger by a first cooling tower, a variable-frequency cold water pump, a second cooling tower and a variable-frequency cold water pump which are matched with the cold water supply device to be tested, wherein the flow of the cold water is the variable-frequency cold water pump, the water chilling unit, a plate heat exchanger and a water collector, and the cold water returns to the variable-frequency cold water pump through the water collector to form circulation. The cooling water supplied by the variable-frequency cooling pump set is arranged in the plate heat exchanger, the cooling water and the cooling water are subjected to heat transfer in the plate heat exchanger, the running load of the unit is maintained, the load quantity can be adjusted at any time, and then the energy efficiency of the water chilling unit under different conditions is tested according to the application method.
Compared with the prior art, the invention has the following advantages:
(1) The invention can test the running efficiency of the water chilling unit under variable working conditions and provide data for performance evaluation of the water chilling unit and the water chilling system; the system can provide a basis for the optimal adjustment of actual operation, accumulate operation energy efficiency data, and can supply the cold water of a workshop according to the optimal energy efficiency of a unit according to different loads; the power consumption of the system is reduced, and the running cost is reduced;
(2) During testing, the refrigerating capacity of the water chilling unit is transmitted to the cooling water, the refrigerating capacity is not wasted, all the cooling water is in the same water pool, the refrigerating capacity of the water chilling unit is used for adjusting the temperature of the cooling water, other cooling water systems are synchronously supplied, and energy waste caused by using external energy to provide a heat source testing method is avoided.
(3) The invention has the advantages of small modification to the existing device, better utilization of most pipelines of the original system, convenient construction, convenient modification to the existing cold water supply system, easy acceptance by users and great economic benefit.
Drawings
FIG. 1 is a schematic view of the structure of the present invention in embodiment 1;
FIG. 2 is a schematic structural view of the present invention in embodiment 2;
in the figure, 1 is a water chilling unit, and 2 is a variable-frequency cold water pump; 3 is a variable-frequency cooling pump; 4 is a first cooling tower; 5 is a plate heat exchanger; 6 is a variable-frequency cooling pump set; 7 is a second cooling tower; 8 is a flowmeter; 9 is a first temperature sensor; 10 is a second temperature sensor; 11 is a third switching valve; 12 is a second switching valve; 13 is a first switching valve; 14 is a fourth switching valve; 15 is workshop cold water backwater; 16 is cold water supply for workshops; 17 is cooling water for other equipment; 18 is a water collector, 19 is a water chilling unit a, and 20 is a variable-frequency cold water pump a;21 is a variable-frequency cooling water pump a; a first cooling tower a is denoted by 22, a water chilling unit b is denoted by 23, and a variable-frequency cold water pump b is denoted by 24; 25 is a variable-frequency cooling water pump b; reference numeral 26 denotes a first cooling tower b, and 27 denotes a cooling water reservoir.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
A variable working condition energy efficiency test system of a cold water supply system is shown in fig. 1 and comprises a cold water supply device, a cooling water supply device and a plate heat exchanger 5, wherein the cold water supply device supplies cold water for workshops, and the cooling water supply device supplies water for other cooling water equipment.
The cold water supply device comprises a water collector 18, a water chilling unit 1, a variable-frequency cold water pump 2 and a variable-frequency cooling pump 3 which are sequentially connected, wherein the water collector 18 is connected with a workshop cold water return 15 through a pipeline, a first switching valve 13 is arranged on a pipeline between the water collector 18 and the workshop cold water return 15, a cold water output end of the water chilling unit 1 is connected with a workshop cold water supply 16 through a pipeline, and a second switching valve 12 is arranged on a pipeline between the water chilling unit and the water chilling unit.
The cooling water supply device comprises a first cooling tower 4, a second cooling tower 7, a cooling water reservoir 27, a variable-frequency cooling pump set 6 and a variable-frequency cooling pump 3, wherein the output end of the first cooling tower 4 is connected with the cooling water reservoir 27, the output end of the cooling water reservoir 27 is connected with the cooling water input end of the water chilling unit 1 through the variable-frequency cooling pump 3, and the cooling water output end of the water chilling unit 1 is connected with the first cooling tower 4; the output end of the second cooling tower 7 is connected with a cooling water reservoir 27, and the input end of the variable-frequency cooling pump set 6 is connected with the cooling water reservoir 27.
The cold water output end of the water chilling unit 1 is connected with a water collector 18 through a circulating pipeline, a third switching valve 11 is arranged on the circulating pipeline, and a fourth switching valve 14 is arranged between the third switching valve 11 and the water collector 18; the cold water inlet and the cold water outlet of the plate heat exchanger 5 are connected with the circulation line and are connected in parallel with a third switching valve 11; the cooling water inlet of the plate heat exchanger 5 is connected with the variable frequency cooling pump set 6, the cooling water outlet is connected with the second cooling tower 7, and a flowmeter is arranged on the cooling water inlet pipeline of the plate heat exchanger 5. A first temperature sensor 9 and a second temperature sensor 10 are respectively arranged on the cold water inlet pipeline and the cold water outlet pipeline of the plate heat exchanger 5; a flowmeter 8 is arranged on the circulation pipeline, and the flowmeter 8 is arranged between the third switching valve 11 and the fourth switching valve 14; all electric equipment in the water chilling unit 1 and the system device are respectively provided with an electric quantity meter, namely a multifunctional ammeter.
In this embodiment, the first switching valve 13, the second switching valve 12, and the fourth switching valve 14 are electric valves; the third switching valve 11 is a manual valve; the flowmeter 8 is an electromagnetic flowmeter, and the fan motor of the cooling tower is a variable frequency motor.
The functions of each device in the system of this embodiment are:
water chiller 1: and preparing cold water for air conditioning.
Variable-frequency cold water pump 2: and conveying cold water produced by the water chilling unit.
Variable frequency cooling pump 3: and providing cooling water for the water chilling unit.
First cooling tower 4: and cooling water is discharged from the heat brought out by the condenser of the water chilling unit, and the temperature of the cooling water is regulated.
Plate heat exchanger 5: the cooling water exchanges heat with the cold water, and the variable-frequency cooling water pump group is combined to provide stable heat load for the cold water system.
Variable frequency cooling pump group 6: and cooling water is provided for other cooling water using equipment, and after modification, water is also provided for the primary side of the plate replacement at the same time, so that a heat source is provided.
Temperature sensor (first temperature sensor 9 and second temperature sensor 10): and measuring the temperature of the cold water inlet and outlet of the plate heat exchanger.
A flow meter: the flow of cold water and cooling water was measured.
And (3) a valve: system switching.
The working principle of the embodiment is as follows:
when the system is in normal operation, the first switching valve 13 and the second switching valve 12 are opened, the fourth switching valve is closed 14, the variable-frequency cold water pump 2, the water chilling unit 1, the first cooling tower 4 and the second cooling tower 7 are started, and at the moment, the cold water supply device and the cooling water supply device start to operate to supply cold water for workshops and supply water for other cooling water consuming devices.
When the energy efficiency of the water chiller needs to be tested, disconnecting the cold water supply device from the workshop system, closing the first switching valve 13, the second switching valve 12 and the third switching valve 11, and opening the fourth switching valve 14; the method comprises the steps of starting a water chilling unit 1 and a variable-frequency cold water pump 2 of a cold water supply device to be tested, and enabling cooling water output by the variable-frequency cold water pump 6 and cold water output by the water chilling unit 1 to exchange heat in a plate heat exchanger 5 through a first cooling tower 4, a variable-frequency cooling pump 3, a second cooling tower 7 and a variable-frequency cooling pump set 6 which are matched with the cold water supply device to be tested, wherein the flow of the cold water is the variable-frequency cold water pump 2, the water chilling unit 1, the plate heat exchanger 5 and a water collector 18, and the cold water returns to the variable-frequency cold water pump 2 through the water collector 18 to form circulation. The plate heat exchanger 5 is internally provided with cooling water supplied by the variable-frequency cooling pump set, the cooling water and the cooling water perform heat transfer in the plate heat exchanger, the running load of the unit is maintained, the load quantity can be adjusted at any time, and then the energy efficiency of the water chilling unit under different conditions is tested according to the application method. Measuring the temperature of a cold water inlet and a cold water outlet of the heat exchanger through a first temperature sensor 9 and a second temperature sensor 10, measuring the flow of cold water in the water chilling unit 1 through a flowmeter 8, and calculating to obtain the cooling capacity Q of the heat exchanger, wherein the cooling capacity Q is the refrigerating capacity of the water chilling unit 1; and calculating the energy efficiency 9 (COP) of the water chiller 1 according to the power consumption W of the water chiller 1 and the cooling capacity Q.
The specific test items and test methods are as follows:
a, adjusting the heat load of the cold water supply device by adjusting the frequency of the variable-frequency cooling pump set, repeating the step c, and testing the energy efficiency of the cold water unit 1 under different heat loads;
b, adjusting the temperature of a cooling water reservoir 27 by adjusting the motor frequency of the first variable-frequency cooling tower and the motor frequency of the second variable-frequency cooling tower and opening and closing the motor, repeating the step c, and measuring the energy efficiency of the water chilling unit 1 under different cooling water temperature conditions;
c, adjusting the cooling water flow of the water chilling unit 1 by adjusting the frequency of the variable-frequency cooling pump, repeating the step c, and measuring the energy efficiency of the water chilling unit 1 under different cooling water flow conditions;
g, adjusting the cold water flow of the water chilling unit 1 by adjusting the frequency of the variable-frequency cold water pump 2, repeating the step c, and measuring the energy efficiency of the water chilling unit 1 under different cold water flow conditions;
d, repeating the step c by adjusting the set temperature change of the cold water outlet of the cold water unit 1, and measuring the energy efficiency of the cold water unit 1 under different set temperatures of the evaporator outlets of the cold water unit 1.
The system of the embodiment is not only limited to testing the energy efficiency of the water chilling unit, all the matched equipment has electric quantity metering, and can test the energy consumption of the water chilling system under different working conditions and accumulate experience data for subsequent operation.
The device of the embodiment can test the operation efficiency of the water chilling unit under the variable working condition, provide data for performance evaluation of the water chilling unit and a water chilling system, provide a basis for optimal adjustment of actual operation, accumulate operation energy efficiency data, and supply water according to the optimal energy efficiency of the unit according to different loads when cold water is supplied to a workshop, so that the power consumption of the system is reduced, and the operation cost is reduced. The system is changed little, a platen heat exchanger, a plurality of valves and flow meters are additionally arranged for providing stable heat load for the cold water system to perform energy efficiency test, the newly added part is shown in a broken line frame in fig. 1, and most pipelines of the original system are used, so that the construction is convenient. During testing, the refrigerating capacity of the water chilling unit is transferred to the cooling water, but the refrigerating capacity is not wasted, because the cooling water coming out of the plate heat exchanger is returned to the cooling water reservoir through the second cooling tower, all the cooling water is in the same water reservoir, the refrigerating capacity of the water chilling unit is used for regulating the temperature of the cooling water, and other cooling water systems are synchronously supplied. The waste of the test method of using external energy to provide a heat source is avoided.
Example 2
The main structure of embodiment 2 is the same as that of the embodiment except that the apparatus of this embodiment includes two sets of cold water supply devices, and the two sets of cold water supply devices share one water collector 18, as shown in fig. 2.
The two sets of cold water supply devices are respectively a first cold water supply device and a second cold water supply device which are connected in parallel, wherein the first cold water supply device comprises a variable-frequency cold water pump a 20, a cold water unit a 19 and a variable-frequency cold water pump a 21 which are sequentially connected, the variable-frequency cold water pump a 20 is connected with a water collector 18, the variable-frequency cold water pump a 21 is connected with a cold water reservoir 27, and a first cooling tower a 22 matched with the cold water unit a 19 is arranged in the cold water supply device.
The second cold water supply device comprises a variable-frequency cold water pump b 24, a water chilling unit b 23 and a variable-frequency cold water pump b 25 which are sequentially connected, the variable-frequency cold water pump b 24 is connected with the water collector 18, the variable-frequency cold water pump b 25 is connected with a cold water reservoir 27, and a first cooling tower b 26 matched with the water chilling unit b 23 is arranged in the cold water supply device.
During testing, the first cold water supply device and the second cold water supply device are respectively tested, and the corresponding first cooling tower, variable-frequency cooling pump, water chilling unit and variable-frequency cold water pump are started.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (9)
1. The variable working condition energy efficiency test system of the cold water supply system is applied to testing the energy efficiency of the cold water unit and comprises a cold water supply device and a cooling water supply device; the cold water supply device comprises a water collector (18), a variable-frequency cold water pump (2) and a cold water unit (1) which are sequentially connected with a workshop cold water backwater (15) in a pipeline manner, wherein the cold water output end of the cold water unit (1) is connected with a workshop cold water supply (16) in a pipeline manner, a first switching valve (13) is arranged on the pipeline between the workshop cold water backwater (15) and the variable-frequency cold water pump (2), and a second switching valve (12) is arranged on the pipeline between the cold water output end of the cold water unit (1) and the workshop cold water supply (16); the cooling water supply device comprises a first cooling tower (4), a cooling water reservoir (27) connected with the output end of the first cooling tower (4), and the output end of the cooling water reservoir (27) is connected with the cooling water input end of the water chilling unit (1) through a variable-frequency cooling pump (3), and the cooling water output end of the water chilling unit (1) is connected with the first cooling tower (4);
it is characterized in that the method comprises the steps of,
the cooling water supply device also comprises a heat exchanger, a second cooling tower (7) with an output end connected with a cooling water reservoir (27), and a variable-frequency cooling pump set (6) with an input end connected with the cooling water reservoir (27);
the cold water output end of the water chilling unit (1) is connected with the water collector (18) through a circulating pipeline, a third switching valve (11) is arranged on the circulating pipeline, and a fourth switching valve (14) is arranged between the third switching valve (11) and the water collector (18); the cold water inlet and the cold water outlet of the heat exchanger are connected with a circulating pipeline and are connected with the third switching valve (11) in parallel;
the cooling water inlet of the heat exchanger is connected with a variable-frequency cooling pump set (6), and cooling water from the cooling water outlet of the heat exchanger returns to a cooling water reservoir (27);
a first temperature sensor (9) and a second temperature sensor (10) are respectively arranged on a cold water inlet pipeline and a cold water outlet pipeline of the heat exchanger; a flowmeter (8) is arranged on the circulating pipeline; the water chilling unit (1) is provided with an electric quantity meter;
the application of the variable working condition energy efficiency test system of the cold water supply system in testing the energy efficiency of the cold water unit (1) comprises the following steps:
(a) Closing the first switching valve (13), the second switching valve (12) and the third switching valve (11), and closing the fourth switching valve (14);
(b) Starting a water chilling unit (1) and a variable-frequency cold water pump (2) of a cold water supply device to be tested, and performing heat exchange on cooling water output by the variable-frequency cold water pump (6) and cold water output by the water chilling unit (1) in a heat exchanger by a first cooling tower (4), a variable-frequency cold water pump (3), a second cooling tower (7) and a variable-frequency cold water pump set (6) which are matched with the cold water supply device to be tested;
(c) The temperature of a cold water inlet and a cold water outlet of the heat exchanger is measured through a first temperature sensor (9) and a second temperature sensor (10), the flow rate of cold water in the water chilling unit (1) is measured through a flowmeter (8), and the cooling capacity Q at the heat exchanger is obtained through calculation, wherein the cooling capacity Q is the refrigerating capacity of the water chilling unit (1); calculating according to the power consumption W of the water chilling unit (1) and the cooling capacity Q to obtain the energy efficiency of the water chilling unit (1);
(d) The energy efficiency test under different working conditions is carried out,
according to the first working condition, the heat load of the cold water supply device is regulated by regulating the frequency of the variable-frequency cooling pump set (6), the step (c) is repeated, and the energy efficiency of the cold water unit (1) under different heat loads is tested;
according to the second working condition, the temperature of a cooling water reservoir (27) is adjusted by adjusting the frequency of a motor of the first variable-frequency cooling tower and the frequency of a motor of the second variable-frequency cooling tower and opening and closing the motor, the step (c) is repeated, and the energy efficiency of the water chilling unit (1) under different cooling water temperature conditions is measured;
the third working condition is that the cooling water flow of the water chilling unit (1) is regulated by regulating the frequency of the variable-frequency cooling pump, the step (c) is repeated, and the energy efficiency of the water chilling unit (1) under different cooling water flow conditions is measured;
in the fourth working condition, the cold water flow of the cold water unit (1) is regulated by regulating the frequency of the variable-frequency cold water pump (2), the step (c) is repeated, and the energy efficiency of the cold water unit (1) under different cold water flow conditions is measured;
and (c) under the fifth working condition, by adjusting the set temperature change of the cold water outlet of the cold water unit (1), repeating the step (c), and measuring the energy efficiency of the cold water unit (1) under the set temperatures of the outlets of the evaporators of the different cold water units (1).
2. Use of a variable operating mode energy efficiency test system for a cold water supply system according to claim 1 for testing the energy efficiency of a cold water machine set, wherein the cooling water outlet of the heat exchanger is connected to a second cooling tower (7).
3. Use of a variable operating mode energy efficiency test system for a cold water supply system according to claim 1 for testing the energy efficiency of a cold water machine set, wherein the heat exchanger is a plate heat exchanger (5).
4. The application of the variable working condition energy efficiency test system of the cold water supply system in testing the energy efficiency of the cold water machine set according to claim 1, wherein the first switching valve (13), the second switching valve (12) and the fourth switching valve (14) are electric valves; the third switching valve (11) is a manual valve.
5. The application of a variable working condition energy efficiency test system of a cold water supply system in testing energy efficiency of a cold water unit according to claim 4, wherein the cold water supply device is provided with a plurality of sets of cold water supply devices which are connected in parallel; each set of cold water supply device is respectively matched with a set of first cooling tower (4) and a variable-frequency cooling pump (3); the sets of cold water supply means share a water collector (18).
6. The variable operating mode energy efficiency test system for a cold water supply system according to claim 5, wherein the cold water supply device is provided with two sets.
7. The application of a variable working condition energy efficiency test system of a cold water supply system according to claim 1 in testing energy efficiency of a cold water unit, wherein a cooling water outlet pipeline and a cooling water inlet pipeline of the heat exchanger are connected with a cooling water conveying pipeline for conveying cooling water to external water using equipment.
8. The application of the variable working condition energy efficiency test system of the cold water supply system in testing the energy efficiency of the cold water unit according to claim 1, wherein the flowmeter (8) is an electromagnetic flowmeter, and the fan motor of the cooling tower is a variable frequency motor.
9. The application of a variable working condition energy efficiency test system of a cold water supply system in testing energy efficiency of a cold water unit according to claim 1, wherein electric equipment in the variable working condition energy efficiency test system is respectively provided with an electric quantity meter.
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| CN113804263A (en) * | 2021-11-04 | 2021-12-17 | 铭镭激光智能装备（河源）有限公司 | Equipment and method for detecting refrigerating capacity of water chiller |
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