CN111964165A - Energy-saving cold water system and energy-saving operation method - Google Patents
Energy-saving cold water system and energy-saving operation method Download PDFInfo
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- CN111964165A CN111964165A CN202010668916.XA CN202010668916A CN111964165A CN 111964165 A CN111964165 A CN 111964165A CN 202010668916 A CN202010668916 A CN 202010668916A CN 111964165 A CN111964165 A CN 111964165A
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
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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
- 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
- F24F5/0007—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 cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/04—Compression machines, plants or systems, with several condenser circuits arranged in series
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Other Air-Conditioning Systems (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an energy-saving cold water system, which selects a variable-frequency compressor or a magnetic suspension compressor and is matched with series-connection countercurrent to realize the highest energy efficiency of the system under multiple working conditions. The energy-saving cold water system consists of two independent refrigerating systems respectively comprising a compressor, an evaporator and a condenser and a refrigerating system II, wherein the two refrigerating systems realize series connection operation and/or parallel connection operation through a pipeline and a valve on the pipeline, and the refrigerating systems I and the condenser of the refrigerating system II are connected with a cooling tower which selects energy storage type fillers. The invention also provides an energy-saving operation method of the energy-saving water-cooling cold water system with high energy efficiency, belonging to the technical field of refrigeration and air-conditioning system integration.
Description
Technical Field
The invention relates to a cold water system, in particular to an energy-saving water-cooling cold water system and an energy-saving operation method, and belongs to the technical field of refrigeration and air-conditioning system integration.
Background
Along with the high-speed growth of Chinese economy, the importance of building energy conservation is gradually reflected. At present, the proportion of building energy consumption to the terminal energy consumption of the whole society of China is about 27.5%. Along with the development of urbanization, the building energy consumption is rapidly increased, and the development of urbanization causes great pressure on building energy supply in China. In the current whole town building energy consumption, the air-conditioning energy consumption accounts for the most important aspect, especially for the special climatic characteristics of hot summer, cold winter and moist cold air in the downstream areas in the Yangtze river, and the refrigeration air-conditioning energy consumption accounts for 50-70% of the total energy consumption of the building. Research and research show that more than 70% of the existing buildings at present belong to high-energy-consumption buildings and have certain energy-saving transformation potential. In present building refrigeration air conditioning system, the cooling that extensively uses is the cooling water set, and it reaches the effect that reduces condensing temperature through the cooling tower with evaporation cooling's mode, and condenser condensing temperature can reach outdoor air wet bulb temperature theoretically, compares with air source heat pump, and condensing temperature obtains bigger reduction to unit cooling efficiency has been improved.
The chiller as the heart part has a great influence on the performance of the refrigeration system, however, the water-cooled chiller comprises a chiller, a cooling water pump, a cooling tower and a chilled water pump. The cooling tower reduces the power consumption, will increase condenser condensation temperature to reduce the cooling water set efficiency. The increase of cooling water pump flow can make cooling water temperature difference reduce, and the condensation temperature reduces, and the cooling water set efficiency increases, but the cooling water pump consumption increases, and whether whole efficiency promotes can not be confirmed yet. Therefore, the energy efficiency of the system is comprehensively considered, and the design and optimization of the high-efficiency water-cooling cold water system are important for saving energy of the air-conditioning system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-energy-efficiency and energy-saving water-cooling water cooling system and an energy-saving operation method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an energy-saving cold water system is composed of two independent refrigerating systems respectively including a compressor, an evaporator and a condenser, and a refrigerating system II, wherein the two refrigerating systems are connected in series and/or in parallel through a pipeline and a valve on the pipeline, and the condensers of the refrigerating systems I and II are connected with a cooling tower with energy storage type fillers.
Furthermore, the inlets of the evaporators of the first refrigeration system and the second refrigeration system are connected in series through a pipeline and are connected with external chilled water inlet water, the outlets of the evaporators are connected in series through a pipeline and are connected with external chilled water outlet water, the inlet of the evaporator of the first refrigeration system and the outlet of the evaporator of the second refrigeration system are connected through a pipeline and a valve I on the pipeline, a valve II is arranged on the external pipeline of the outlet of the evaporator of the second refrigeration system, and a valve III is arranged on the external pipeline of the inlet of the evaporator of the first refrigeration system; the inlet of the condenser of the first refrigeration system and the inlet of the condenser of the second refrigeration system are connected in series through a pipeline and are connected with the water inlet of the cooling tower, the outlet of the condenser is connected in series through a pipeline and is connected with the water outlet of the cooling tower, the inlet of the condenser of the first refrigeration system and the outlet of the condenser of the second refrigeration system are connected through a pipeline and a valve IV on the pipeline, a valve V is arranged on the external pipeline of the outlet of the condenser of the second refrigeration system, and a valve VI is arranged on the external.
Further, the compressor is a variable frequency compressor or a magnetic suspension compressor.
Furthermore, the rated flow rates of the condenser and the evaporator of the cold water system are within 1.5 m/s.
An energy-saving operation method of an energy-saving cold water system comprises the following steps:
(1) when the load of the cold water system is 70-100%, the evaporator side and the condenser side are operated in a parallel mode;
the parallel mode operation method comprises the following steps: for the evaporator, the first valve is closed, the second valve and the third valve are opened, and the chilled water of the first refrigeration system and the chilled water of the second refrigeration system respectively enter the inlet of the evaporator, then exit from the outlet of the evaporator, are combined and then flow out to a system pipeline;
for the condenser, the fourth valve is closed, the fifth valve and the sixth valve are opened, cooling water returning from the cooling tower enters the inlets of the first and second condensers, and the cooling water with the increased water temperature enters the cooling tower after coming out of the outlet of the condenser and being combined;
(2) when the load of the cold water system is 30-70%, the evaporator side and the condenser side are operated in a series mode;
the operation method of the series mode comprises the following steps: for the evaporator, the first valve is opened, the second valve and the third valve are closed, the chilled water enters the inlet of the evaporator of the second refrigeration system due to the closing of the third valve, the chilled water enters the inlet of the evaporator of the first refrigeration system through the first valve after the temperature is reduced, and then the chilled water enters the system after the temperature is further reduced;
for the condenser, a valve IV is opened, a valve V and a valve VI are closed, and cooling water enters the inlet of the condenser II of the refrigeration system, passes through the outlet of the condenser, enters the inlet of the condenser I of the refrigeration system through the valve IV and then enters the cooling tower through the outlet of the refrigeration system I;
(3) when the load of the cold water system is 5-30%, all valves are opened, and one refrigerating system is closed, and only one refrigerating system is operated.
Has the advantages that:
1. the energy-saving water-cooling cold water system provided by the invention can realize high-efficiency operation under the full-refrigeration working condition on the whole;
2. the invention provides an energy-saving water-cooling cold water system, which adopts a variable frequency compressor or a magnetic suspension compressor, and has higher partial load energy efficiency than full load energy efficiency;
3. according to the energy-saving water-cooling cold water system, the evaporators adopt a series-connection countercurrent design, so that the evaporation temperature of one host can be increased, and the energy efficiency of the system is greatly improved;
4. according to the energy-saving water-cooling cold water system, the condenser is designed in a series countercurrent mode, so that the condensation temperature of one host can be reduced, and the energy efficiency of the system is greatly improved;
5. according to the energy-saving water-cooling cold water system, the phase change energy storage module is configured on the cooling tower filler, so that the cold energy of low ambient temperature at night can be absorbed, the water temperature of the cooling water inlet and the cooling water outlet is basically constant, and the average temperature and the fluctuation range of the cooling water are reduced, so that the energy efficiency and the stability of the system are improved;
6. the invention provides an energy-saving water-cooling cold water system which realizes optimal system energy efficiency operation under multiple working conditions through system centralized control.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure, 1-one refrigeration system, 2-two refrigeration system, 3-cooling tower, 4-valve I, 5-valve II, 6-valve III, 7-valve IV, 8-valve V, 9-valve VI, 11-compressor, 12-evaporator, 13-condenser, 21-compressor, 22-evaporator, 23-condenser and 31-energy storage type filler.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following examples. Any equivalent modifications made by those skilled in the art in the light of the teachings of this invention should be within the scope of this invention.
As shown in fig. 1, an energy-saving cold water system selects a variable frequency compressor or a magnetic suspension compressor, and is matched with series-connection countercurrent to realize the highest energy efficiency of the system under multiple working conditions. Energy storage type filler 31 is selected for use to cooling tower 3, can effectively utilize the difference in temperature round the clock, realizes that cooling water temperature is invariable as far as possible simultaneously, promotes the system efficiency. Specifically, the energy-saving cold water system is composed of two independent refrigeration systems 1 and two independent refrigeration systems 2, wherein the refrigeration systems 1 and the refrigeration systems 2 respectively comprise a compressor 11/21, an evaporator 12/22 and a condenser 13/23, the compressors are frequency conversion compressors or magnetic suspension compressors, the two refrigeration systems are in series and/or parallel operation through pipelines and valves on the pipelines, the condensers of the refrigeration systems 1 and the refrigeration systems 2 are connected with a cooling tower 3 which selects an energy storage type filler 31, the refrigeration system composed of the compressors, the evaporator and the condenser is a refrigeration system commonly used in the prior art, the technical scheme is commonly used in the field, and is not repeated herein, and in addition, the rated flow rates of the condenser and the evaporator of the cold water system are within 1.5 m/s.
Furthermore, inlets of evaporators of the refrigeration system I1 and the refrigeration system II 2 are connected in series through a pipeline and are connected with external chilled water inlet water, an outlet of the evaporator is connected with external chilled water outlet water in series through a pipeline, an inlet of the evaporator of the refrigeration system I1 is connected with an outlet of the evaporator of the refrigeration system II 2 through a pipeline and a valve I4 on the pipeline, a valve II 5 is arranged on an external pipeline of an outlet of the evaporator of the refrigeration system II 2, and a valve III 6 is arranged on an external pipeline of an inlet of the evaporator of the refrigeration system I1; the inlet of the condenser of the refrigerating system I1 and the inlet of the condenser of the refrigerating system II 2 are connected in series through a pipeline and are connected with the water inlet of a cooling tower 3, the outlet of the condenser is connected in series through a pipeline and is connected with the water outlet of the cooling tower 3, the inlet of the condenser of the refrigerating system I1 and the outlet of the condenser of the refrigerating system II 2 are connected through a pipeline and a valve IV 7 on the pipeline, a valve V8 is arranged on an external pipeline of the outlet of the condenser of the refrigerating system II 2, and a valve VI 9 is arranged on an external pipeline.
An energy-saving operation method of an energy-saving cold water system comprises the following steps:
(1) when the load of the cold water system is 70-100%, the evaporator side and the condenser side are operated in a parallel mode;
the parallel mode operation method comprises the following steps: for the evaporator, the first valve 4 is closed, the second valve 5 and the third valve 6 are opened, and the chilled water of the refrigeration system 1 enters the inlet of the evaporator 12 through the third valve 6, then exits from the outlet of the evaporator 12 and is combined with the chilled water at the outlet of the second valve 5 and then flows out of a system pipeline; the chilled water simultaneously enters the inlet of the evaporator 22 of the second refrigeration system 2, and the chilled water at the outlet of the evaporator 22 is combined with the chilled water of the first refrigeration system 1 through a second valve 5 and then flows out of a system pipeline;
for the condenser, closing a valve IV 7, enabling cooling water returning from the cooling tower 3 to enter an inlet of a condenser 13 of the refrigeration system I1 through a valve VI 9, raising the water temperature, combining with cooling water of the system II 2, and then enabling the cooling water to enter the cooling tower 3; the other path of cooling water enters a condenser 23 of the second system 2, and the cooling water after being heated is hydrated and enters a cooling tower 3 through a valve five 8 and a refrigeration system 1;
(2) when the load of the cold water system is 30-70%, the evaporator side and the condenser side are operated in a series mode;
the operation method of the series mode comprises the following steps: for the evaporator, the first valve 4 is opened, the second valve 5 and the third valve 6 are closed, as the third valve 6 is closed, the chilled water enters the inlet 22 of the evaporator 2 of the second refrigeration system, the chilled water enters the inlet 12 of the evaporator 1 of the first refrigeration system through the first valve 4 after the temperature is reduced, and then the chilled water enters the system after the temperature is further reduced;
for the condenser, a valve IV 7 is opened, a valve V8 and a valve VI 9 are closed, and cooling water enters an inlet of a condenser 23 of a second refrigerating system 2, enters an inlet of a condenser 13 of a first refrigerating system 1 through an outlet of the condenser 23 through the valve IV 7 and then enters a cooling tower 3 through an outlet of the condenser 13 of the first refrigerating system 1 due to the closing of the valve VI 9;
(3) when the load of the cold water system is 5-30%, all valves are opened, and one refrigerating system is closed, and only one refrigerating system is operated.
Cooling tower 3: cooling water enters a cooling tower 3 through a pipeline, and a phase change energy storage module is arranged in a filler of the cooling tower 3, so that the temperature of the cooling water at a cooling water outlet is basically constant at a certain fixed value, and the constant cooling water enters a unit condenser through the pipeline.
And (3) controlling the system: for a refrigeration system, the system load is the refrigeration capacity divided by the total power consumption (including compressor, cooling water pump, chilled water pump, cooling tower 3 power consumption). When the load of the refrigerating system is 70% -100%, the evaporator side and the condenser side are operated in a parallel mode due to the fact that the power consumption of the water pump is large; when the load of the refrigerating system is 30% -70%, the refrigerating system is operated in a series mode, the evaporation temperature of one host can be increased, and the condensation temperature of the other host can be increased, so that the energy efficiency of the hosts is greatly increased, and the energy efficiency increase amplitude is higher than the increase of the power consumption of the water pump caused by the energy efficiency increase amplitude; when the load is from 5% to 30%, one refrigerating system is closed, and only one refrigerating system is operated. The phase change cold accumulation module of the cooling tower 3 is used for basically keeping the temperature of the cooling water constant when the outdoor temperature fluctuates.
Claims (5)
1. An energy-saving cold water system is characterized in that: the system comprises two independent refrigerating systems respectively comprising a compressor, an evaporator and a condenser and a refrigerating system II, wherein the two refrigerating systems realize series connection operation and/or parallel connection operation through a pipeline and a valve on the pipeline, and the condensers of the refrigerating systems I and II are connected with a cooling tower which selects energy storage type fillers.
2. An energy efficient chilled water system according to claim 1, wherein: the inlet of the evaporator of the first refrigeration system and the inlet of the evaporator of the second refrigeration system are connected in series through a pipeline and are connected with external chilled water inlet water, the outlet of the evaporator is connected with external chilled water outlet water in series through a pipeline, the inlet of the evaporator of the first refrigeration system and the outlet of the evaporator of the second refrigeration system are connected through a pipeline and a first valve on the pipeline, a second valve is arranged on the pipeline outside the outlet of the evaporator of the second refrigeration system, and a third valve is arranged on the pipeline outside the inlet of the evaporator of the first refrigeration system; the inlet of the condenser of the first refrigeration system and the inlet of the condenser of the second refrigeration system are connected in series through a pipeline and are connected with the water inlet of the cooling tower, the outlet of the condenser is connected in series through a pipeline and is connected with the water outlet of the cooling tower, the inlet of the condenser of the first refrigeration system and the outlet of the condenser of the second refrigeration system are connected through a pipeline and a valve IV on the pipeline, a valve V is arranged on the external pipeline of the outlet of the condenser of the second refrigeration system, and a valve VI is arranged on the external.
3. An energy efficient chilled water system according to claim 1 or 2, wherein: the compressor is a variable frequency compressor or a magnetic suspension compressor.
4. An energy efficient chilled water system according to claim 1 or 2, wherein: the rated flow rates of the condenser and the evaporator of the cold water system are within 1.5 m/s.
5. An energy-saving operation method of the energy-saving cold water system according to any one of claims 1 to 4, characterized by comprising the steps of:
(1) when the load of the cold water system is 70-100%, the evaporator side and the condenser side are operated in a parallel mode;
the parallel mode operation method comprises the following steps: for the evaporator, the first valve is closed, the second valve and the third valve are opened, and the chilled water of the first refrigeration system and the chilled water of the second refrigeration system respectively enter the inlet of the evaporator, then exit from the outlet of the evaporator, are combined and then flow out to a system pipeline;
for the condenser, the fourth valve is closed, the fifth valve and the sixth valve are opened, cooling water returning from the cooling tower enters the inlets of the first and second condensers, and the cooling water with the increased water temperature enters the cooling tower after coming out of the outlet of the condenser and being combined;
(2) when the load of the cold water system is 30-70%, the evaporator side and the condenser side are operated in a series mode;
the operation method of the series mode comprises the following steps: for the evaporator, the first valve is opened, the second valve and the third valve are closed, the chilled water enters the inlet of the evaporator of the second refrigeration system due to the closing of the third valve, the chilled water enters the inlet of the evaporator of the first refrigeration system through the first valve after the temperature is reduced, and then the chilled water enters the system after the temperature is further reduced;
for the condenser, a valve IV is opened, a valve V and a valve VI are closed, and cooling water enters the inlet of the condenser II of the refrigeration system, passes through the outlet of the condenser, enters the inlet of the condenser I of the refrigeration system through the valve IV and then enters the cooling tower through the outlet of the refrigeration system I;
(3) when the load of the cold water system is 5-30%, one refrigerating system is closed, and only one refrigerating system is operated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010668916.XA CN111964165A (en) | 2020-07-13 | 2020-07-13 | Energy-saving cold water system and energy-saving operation method |
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| CN202010668916.XA CN111964165A (en) | 2020-07-13 | 2020-07-13 | Energy-saving cold water system and energy-saving operation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117128581A (en) * | 2023-07-27 | 2023-11-28 | 浙江国祥股份有限公司 | Evaporation condensation variable frequency magnetic suspension multi-connected unit |
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2020
- 2020-07-13 CN CN202010668916.XA patent/CN111964165A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117128581A (en) * | 2023-07-27 | 2023-11-28 | 浙江国祥股份有限公司 | Evaporation condensation variable frequency magnetic suspension multi-connected unit |
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