CN113340025A - Seasonal energy storage ground source heat pump refrigerating and heating method and system thereof - Google Patents
Seasonal energy storage ground source heat pump refrigerating and heating method and system thereof Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 80
- 238000010438 heat treatment Methods 0.000 title claims abstract description 60
- 230000001932 seasonal effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 230000005611 electricity Effects 0.000 claims abstract description 51
- 238000005057 refrigeration Methods 0.000 claims description 25
- 238000009825 accumulation Methods 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 8
- 238000005338 heat storage Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 239000011435 rock Substances 0.000 description 6
- 238000012546 transfer Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
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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
- 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
- F24F5/0017—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 using cold storage bodies, e.g. ice
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or 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
- F24F5/0017—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 using cold storage bodies, e.g. ice
- F24F2005/0032—Systems storing energy during the night
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
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- Combustion & Propulsion (AREA)
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a seasonal energy storage ground source heat pump refrigerating and heating method and a system thereof, wherein a ground source heat pump system is adopted to meet the cooling demand of a building in summer; a ground source heat pump system is adopted to meet the heating requirement of the building in winter; the existing seasonal energy storage ground source heat pump technology is improved, and the energy of a heat reservoir is fully utilized by adding a double-effect domestic hot water system and a price difference energy storage system, so that the domestic water supply efficiency is improved, and the redundant energy emission is reduced; the electricity price difference energy storage system can be used for storing energy and assisting in refrigerating and heating by utilizing the electricity price difference at peak and valley, and the energy use cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of ground source heat pump application. In particular to a seasonal energy storage ground source heat pump refrigerating and heating method and a seasonal energy storage ground source heat pump refrigerating and heating system which can design and innovate heat collection and heat exchange with low cost and low cost by utilizing the seasonal air temperature of the sun in the near-ground period and the far-ground period and the difference between the surface heat storage temperature and the ground temperature of a building according to the thermal conditions of the building.
Background
The ground source heat pump is a device for transferring low-grade heat energy to high-grade heat energy by inputting a small amount of high-grade energy into shallow land energy. The ground source heat pump is a heat supply central air conditioning system which takes rock and soil mass, stratum soil, underground water or surface water as a low-temperature heat source and consists of a water ground source heat pump unit, a geothermal energy exchange system and a system in a building. According to different forms of geothermal energy exchange systems, the ground source heat pump system is divided into a buried pipe ground source heat pump system, a ground water ground source heat pump system and a surface water ground source heat pump system.
The traditional ground source heat pump system applies the ground temperature of original rock and soil as a design and application balance point and provides a heat source for heat pump equipment through an underground heat exchanger. The summer redundancy equipment condensation heat exceeding the original ground temperature balance point in its system design must be discharged to the atmosphere via a cooling tower. The method has the disadvantages that the redundant heat in summer is discharged to the atmosphere through the cooling tower and is wasted, and the energy storage of the heat pump is reduced; and the hot and humid air current that produces during the emission, the gathering can lead to the production of city heat island, also can increase city haze simultaneously, and is harmful to the environment not profitable.
The invention provides a seasonal energy storage ground source heat pump heating or cooling method and a device thereof in the Chinese invention patent CN101893350A, wherein switchable energy exchange units are additionally arranged while cooling or heating is carried out by utilizing the temperature of the sun in the near and far seasons and the difference between the surface temperature of a building and the ground temperature, so that gas-water heat exchange, building cladding heat exchange, hard ground heat exchange and water landscape heat exchange are realized, energy storage can balance energy application, and energy redundancy and emission are reduced. However, in practical construction applications, too many energy exchange units increase the construction cost of the system, and the hot water supply is also an important part of the building energy supply, and the problem is not well considered in the invention.
Therefore, in order to solve the problems existing in the previous seasonal energy storage ground source heat pump scheme, a new ground source heat pump application method and system need to be provided.
Disclosure of Invention
The invention aims to provide a seasonal energy storage ground source heat pump refrigerating and heating method and a seasonal energy storage ground source heat pump refrigerating and heating system, and solve the problem that the energy of the existing ground source heat pump is not sufficiently applied.
The technical scheme adopted by the invention for solving the technical problems is as follows: the seasonal energy storage ground source heat pump refrigerating and heating system comprises an underground energy storage device and an energy source station;
the underground energy storage device consists of a water collecting and distributing device and a plurality of ground heat exchangers; the energy station comprises a hot water unit, a heat pump unit, a water chilling unit, a heat exchanger, an energy storage water pool and circulating equipment; and the underground energy storage device is connected with the energy station.
Preferably, the heat pump unit in the energy station is matched with the hot water unit and the circulating equipment to form a double-effect domestic hot water system.
Preferably, in the double-effect domestic hot water system, the frozen backwater of the air conditioner is used as a heat source to enter the evaporator in the refrigeration period, the heat of the Freon working medium is absorbed, the temperature is increased by the pressure of the compressor, and then the high-temperature Freon working medium and the circulating water of the hot water tank exchange heat through the condenser to supply domestic hot water;
when the system heats, the heat pump unit and the hot water unit simultaneously use the heat reservoir after energy storage, the heat pump unit supplies heat for the building, and the hot water unit supplies hot water for the hot water tank.
Preferably, an energy storage water pool in the energy station is matched with the heat exchanger and the hot water unit to form an electricity price difference water energy storage system.
Preferably, the electricity price difference water energy storage system performs electric heating on water in the water tank in an electricity heating mode at the electricity price valley time stage in the heating period; in the stage of peak electricity price in the heating period, hot water in the water tank provides a heat source to the tail end through the heat exchanger;
the electrovalence difference water energy storage system carries out cold accumulation operation at the electrovalence valley time stage in the cold supply period; and a cold source is provided to the tail end through the heat exchanger during the peak period of the electricity price in the cold supply period.
Preferably, the ground pipe in the ground pipe heat exchanger is U-shaped.
The method for refrigerating and heating by using the seasonal energy storage ground source heat pump refrigerating and heating system comprises the following steps:
firstly, determining a time period needing refrigeration and heating according to the actual condition of a system building local, calculating the difference value of the heat absorption quantity A and the heat release quantity B of the area, and calculating to obtain the unbalance value of the ground source energy of the area as | A-B |;
secondly, determining the cold and hot load capacity value of the energy station and the total length of the ground heat exchanger according to the unbalance value of the ground source energy as | A-B | and the building area needing refrigerating and heating;
thirdly, in the cold supply period, the circulating equipment absorbs external heat, the underground energy storage device stores energy in the heat reservoir, and meanwhile, the equipment in the energy station utilizes the temperature difference between the heat reservoir and the circulating medium to refrigerate the building; in the heating period, the underground energy storage device takes heat out of the heat reservoir and heats the building through the energy station; the whole energy application is balanced through auxiliary system when refrigerating and heating, reduces energy use cost.
The method for refrigerating and heating by using the seasonal energy storage ground source heat pump refrigerating and heating system is characterized by comprising the following steps of: the total length (m) and the building area (m) of the ground heat exchanger2) The proportion of (A) is as follows: total length (m) of ground heat exchanger to building area (m)2)＝1∶1。
The method for refrigerating and heating by using the seasonal energy storage ground source heat pump refrigerating and heating system is characterized by comprising the following steps of: the auxiliary system comprises a double-effect domestic hot water system and an electricity price difference water energy storage system.
The invention has the following beneficial effects: the seasonal energy storage ground source heat pump is improved on the basis of the existing seasonal energy storage ground source heat pump technology, the auxiliary system is added to balance the energy application in the heat pump system, and the energy redundancy and the emission are reduced. The double-effect domestic hot water system heats domestic water by utilizing the frozen backwater of the air conditioner through the compressor, realizes the hot water totality and can also assist in refrigeration, and fully utilizes the energy of the system. The electricity price difference water energy storage system utilizes the peak-valley electricity price difference to carry out energy conversion, and effectively reduces the operation cost of the system. The seasonal energy storage ground source heat pump technology is adopted for refrigerating, heating and hot water supply, so that the maintenance and operation cost of the building can be effectively reduced, and the economic benefit is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a hospital and hot store planning;
FIG. 2 is a schematic view of a buried pipe structure;
FIG. 3 is a schematic diagram of a water distributor-collector structure;
FIG. 4 is a schematic diagram of an energy station configuration;
1-screw type water heater unit; 2-screw type heat pump units; 3-centrifugal chiller; 4-energy storage heat exchanger (plate type); 5-energy storage water tank.
Detailed Description
The energy-storage ground source heat pump refrigerating and heating device is built in a hospital in the season, and the building area of the hospital is 128800 square meters. Wherein the ground is 10 ten thousand square meters, the underground is 2.8 ten thousand square meters, and the air-conditioning area is 9 ten thousand square meters; building heat load: 4800kw, index 53 w/m; building cold load: 8757kw, index 95 w/square meter; firstly, according to the heat transfer condition of geological hot-object exploration, the ratio of the building area to the heat transfer extension meter of a heat reservoir pipe is 1:1, according to the building area of 128800 square meters, 128800 extension meters are correspondingly needed, and the depth of each group of heat exchange holes is 100 meters under the condition of regional rock and soil in hospitals, 1288 heat exchange holes are prepared in total. The condensation heat grade of the building is about 37 ℃, the calculated heat transfer limit distance is 1.5-1.8 meters, the designed hole spacing is 4 meters, the hospital and heat reservoir are planned as shown in figure 1, wherein the area is a hospital building area, the area is a heat reservoir building area, the ground heat exchanger is connected and regulated through a water collecting and distributing device, the structure of the ground heat exchanger is shown in figure 2, and the structure of the water collecting and distributing device is shown in figure 3.
Heating and ventilation design habit engagement: the average temperature is below 5 ℃ for 3 continuous days in winter, and the heating starting day is set; the summer outdoor temperature is continuously 3 days, and the average temperature is more than 30 ℃, which is defined as the cooling starting day.
The hospital can freely arrange the running time without the design guidance and meteorological condition, and the running time is determined to be 11 months, 12 months, 1 month, 2 months, 3 months, 4 months and 5 months, and the heating time is 210 days. Cooling for 150 days in five months of 6 months, 7 months, 8 months, 9 months and 10 months.
The heat exchanger of the ground pipe is used for accumulating heat in summer, and the temperature of rock soil is gradually increased to 29 ℃ from 17 ℃/150 days; the working condition is gradually reduced to 15 ℃ from 29 ℃/210 days in the heating period, and the heat pump evaporator has high heat absorption energy efficiency under the condition of average temperature of 22 ℃: average COP of 6.5
The heat exchanger of the ground pipe absorbs heat in winter, and the temperature of rock soil is gradually reduced to 17 ℃ from 29 ℃/180 days; the working condition is gradually increased to 29 ℃ from 17 ℃/150 days in the cold supply period, the heat pump evaporator has high heat release energy efficiency under the average temperature condition of 23 ℃, and the average EER is 6.
The hospital energy station is constructed as shown in fig. 4, and the main equipment configuration comprises:
screw type water heater unit 2
The heating quantity is 587 kw; standard condition power 114 kw; COP 5.15
Refrigeration capacity 552 kw; standard condition power 82 kw; EER 6.73
Screw type heat pump unit 3
Heat production amount 2096 kw; standard condition power 372 kw; COP is 5.63
Refrigerating capacity is 1940 kw; standard condition power 294 kw; EER 6.67
Heat storage amount 1950 kw; standard condition power 391 kw; COP is 5
Cold accumulation amount 1746 kw; standard condition power 291 kw; EER 6
Centrifugal water chilling unit 1
Refrigerating capacity 1934 kw; standard condition power 352 kw; EER 5.5
Energy storage heat exchanger (plate type) 3 stages
The single heat exchange amount is 2911kw, and the total heat exchange amount is 8757kw
Cooling working conditions: 7-12 deg.C
Cold accumulation working condition: 4-11 deg.C
And (3) heating working conditions: 45-40 DEG C
The heat storage working condition is as follows: 48-41 deg.C
Design total heat storage amount of 34112KWh/122.803Gj for 10 hours
Total design cold accumulation amount of 10 hours total 50197KWh/180.711Gj
The designed fouling coefficient is 0.8, and the heat transfer coefficient is 5000w/m2
Single heat exchange area 400m2Three total heat exchange areas 1200m2
1 energy storage water tank
Capacity 5500m3
The hospital is designed to supply domestic hot water for 8760 hours all the year round, and usually adopts fossil energy or electric energy, so that the cost is high. A hospital designs a new domestic hot water supply mode through a seasonal energy storage ground source heat pump device; the supply mode is divided into two sections: 1) 5 months of dual-system refrigeration period: when the heat pump is used for main refrigeration, the freezing return water of the air conditioner is used as a heat source to enter the evaporator, the Freon working medium is used for absorbing heat, and the temperature of the freezing water is reduced to 7 ℃ after absorbing the heat and returns to the refrigeration cycle system for auxiliary refrigeration; the sucked freon working medium heat is pressurized by a compressor and heated to 65 ℃, and then the freon working medium and the hot water tank circulating water exchange heat to 45 ℃ through a condenser. The hot water supply in summer is realized, and the refrigeration of the heat pump main machine is assisted. 2) The two-system heating period is 7 months: the heat pump host and the water heater simultaneously use stored geothermal resources (heat reservoir), and the heat pump host supplies heat for the building; the water heater supplies hot water to the hot water tank.
Rock and soil temperature in the heat reservoir is 20-30 ℃, heat source is provided for the water heater by using circulating water in the heat reservoir, and the COP energy efficiency ratio of heating is 1: about 6.7. The refrigeration backwater is 12 ℃ and provides a heat source for the water heater, and the COP energy efficiency ratio of heating is 1: 4.5. meanwhile, the refrigeration energy efficiency ratio EER 1:5 of the evaporator on the other side is about, and the comprehensive dual energy efficiency COP/EER is 1: 9.5, the income is considerable.
According to the policy of local industrial time-of-use electricity prices, hospitals enjoy the awarding of average electricity prices and peak shifting electric power, and therefore the energy storage water tank 5500 cubic meter is designed. The energy storage water tank electrically heats water in the water tank in an electric heating mode at the electricity price valley time stage in the heating period; in the stage of peak electricity price in the heating period, hot water in the water tank provides a heat source to the tail end through the heat exchanger; the electrovalence difference water energy storage system carries out cold accumulation operation at the electrovalence valley time stage in the cold supply period; and a cold source is provided to the tail end through the heat exchanger during the peak period of the electricity price in the cold supply period.
Calculating the cost of refrigeration and heating according to a seasonal energy storage ground source heat pump system in a hospital;
the hospital belongs to the public building of society, because of designing the device of staggering the peak, the time of use electricity price is measured and charged according to the city large industry through examining and approving, the time of use electricity price is as follows:
9:00-12:00, 17:00-22:00, 8 hours peak electricity rate: 0.9158 yuan/KWh;
8:00-9:00, 12:00-17:00, 6 hours flat peak electricity price: 0.6048 yuan/KWh;
23:00-8:00, 10 hours off-peak electricity price: 0.3629 yuan/KWh;
average industrial electricity price: 0.6077 yuan/KWH.
Off-peak reward electricity price: 0.05 yuan/KWH. About 10 ten thousand yuan throughout the year.
Air supply: (winter main supply period) 3.8 yuan/m3(ii) a 1Gj is 105 yuan
Heat supply contrast of air energy multi-split air-energy unit, energy storage heat pump and gas boiler
Heat supply COP (coefficient of performance) of air energy heat pump is 2.75
Total amount per day: 4800kw × 0.4 × 0.036Gj ÷ 2.75 × 24 ═ 603.23Gj
Daily electricity charge: 603.23Gj × 170 10255 yuan/day
Total electricity charge in hot season: 10255 yuan/day × 210 days 215 ten thousand yuan
Heat supply COP (coefficient of performance) of energy storage heat pump is 6.5
Total amount per day: 4800kw × 0.4 × 0.036Gj ÷ 6.5 × 24 ═ 25.521Gj
Daily electricity charge: 25.521Gj × 170 ═ 4338 yuan/day
Total electricity charge in hot season: 4338 yuan/day × 210 days 91 ten thousand yuan
Heat supply of a gas boiler: COP 1
Total daily calorie of 4800kw × 0.4 × 0036Gj × 24 ═ 165.888 Gj/day
Daily gas consumption 165.888 Gj/0.036 Gj/m3＝4608m3
Total gas cost in the hot season: 4608m3X 210 days x 3.8 yuan 367 ten thousand yuan
According to special requirements of hospitals, the number of heat supply days in the whole year reaches 210 days, and 215 ten thousand yuan per season of air source multi-online heat supply electricity charge is adopted; the energy-storage ground source heat pump is adopted to supply 91 ten thousand yuan/season of electric charge, and the energy-storage heat pump can save 215-91 ten thousand yuan/season compared with the air energy heat pump for supplying heat
Refrigeration comparison of air energy multi-split air conditioner and energy storage heat pump
Air energy heat pump cooling EER 4
Total amount of daily cooling: 8757kw × 0.4 × 0.0036Gj × 24 ÷ 4 ═ 75.660 Gj/day
Daily electricity charge: 75.660Gj 170 ═ 12862 yuan/day
Total refrigeration cost in summer: 12862 yuan × 150 days 193 ten thousand yuan
Energy storage heat pump cooling EER is 6
Total amount of daily cooling: 8757kw × 0.4 × 0.036Gj × 24 ÷ 6 ═ 50.440 Gj/day
Daily electricity charge: 50.440Gj × 270 ═ 8574 yuan/day
Independent refrigeration electric charge in summer: 8574 yuan × 150 days (128 ten thousand yuan)
Heating water and refrigerating electricity charge: 5.494Gj × 170 × 150 days-14 ten thousand yuan/summer
Total refrigeration electricity charge in summer: 128 ten thousand yuan-14 ten thousand yuan is 114 ten thousand yuan
The energy storage ground source heat pump refrigeration saves 193 and 114 ten thousand yuan compared with the air energy heat pump refrigeration each season.
Hot water supply comparison of natural gas boiler and energy storage heat pump
Hot water supply COP of gas boiler is 1
Daily gas amount 587kw × 0.4 × 0.0036Gj × 24 hr/0.036 Gj/m3＝563m3
The annual gas price: 563m3X 3.8 yuan × 365 ═ 78 ten thousand yuan
Energy storage heat pump hot water supply COP is 5, and concurrently refrigerating EER is 6
Total heat supply: 587kw × 0.4 × 0.0036Gj × 24 hr/5 ═ 4.057 Gj/day
Total refrigerating capacity: 587kw × 0.4 × 0.0036Gj × 24 hr/6 ═ 3.381 Gj/day
Electric charge for heating water: 4.057Gj × 170 ═ 690 yuan/day
And refrigeration saves the electricity charge: 3.381Gj × 170 × 150 days 9 ten thousand yuan/summer
The electricity charge is consumed all the year around for making hot water: 690 yuan/day × 365 days-25 ten thousand yuan/summer
The energy storage heat pump supplies hot water for annual saving: 70-25 ═ 45 ten thousand yuan
Energy storage water tank for carrying out electricity price difference energy storage
10 hours at night of 23:00-8:00, valley price: 0.3629 yuan/KWh, heat storage capacity of 10 hours in winter and night, total heat storage capacity of 34112KWH, wherein: the heat loss of the wall of the box wall is 5 percent, and the total is 1705KWh, the load at night is 5527KWh, and the heat is 27000KWH for high/flat price heat.
The high electricity price period in winter is 8 hours, and the total heat demand is as follows:
4800 kW.times.0.4X 8 hr 15360KWh
The winter flat price time period is 6 hours, and the total heat demand is as follows:
4800×0.4×6＝11520KWh
total heat demand of 14 hours in total period of high and flat electricity prices in winter:
15360KWh+11520KWh＝26880KWh＜27000KWH。
the heat storage and heat supply operation all year round in winter:
34112 ÷ 6 × 0.363 ═ 2063 × 210 ═ 43 ten thousand yuan
Heat is not stored and heat supply cost is increased all the year:
15360÷6×0.9158+11520÷6×0.6048+9600÷6×0.363
4086 yuan/day × 210 days 86 ten thousand yuan
The season is 86 ten thousand yuan-43 ten thousand yuan/season
The cool storage amount in summer is 50197KWh, the heat storage loss is 8 percent, and 4015 KWh; duty on duty at night 10039 KWh; can replace 36143KWh of total cold energy with high electricity price.
Alternative high electricity rate times:
36143KWH ÷ (8757 × 0.4 × 8) ═ 1.3; the total amount is 30 percent after 8 hours
And continuously replacing the flat price electricity after replacing the high price electricity:
36143KWH × 0.3 ═ 10843KWh ÷ (8757 × 0.4) ═ 3 hours
Calculating the refrigeration substituted by the high-price electricity for 8 hours cold accumulation:
8757kw ÷ 6 × 8 × 0.4 × (0.9158-0.3629) ═ 2582 yuan/day
The cooling cost can be saved by 2582 x 150 as 39 ten thousand yuan/season in 150 days
Calculating the replacement refrigeration of the flat electricity for 3 hours by cold accumulation:
8757 × 0.4 ÷ 6 × 3 × (0.6048-0.3629) × 150 ═ 14 ten thousand units
The cost is saved in the refrigeration season: 39 ten thousand yuan/season +14 ten thousand yuan/season as 53 ten thousand yuan
The electricity price cost can be saved all the year round: 43+53 ten thousand yuan
According to the measurement and calculation, the seasonal energy storage ground source heat pump system can save 344 ten thousand yuan of energy cost for hospitals each year.
Claims (9)
1. Seasonal energy storage ground source heat pump refrigerating and heating system is characterized in that: the system comprises an underground energy storage device and an energy station;
the underground energy storage device consists of a water collecting and distributing device and a plurality of ground heat exchangers; the energy station comprises a hot water unit, a heat pump unit, a water chilling unit, a heat exchanger, an energy storage water pool and circulating equipment; and the underground energy storage device is connected with the energy station.
2. The seasonal energy storage ground source heat pump refrigerating and heating system as claimed in claim 1, wherein: and the heat pump unit in the energy station is matched with the hot water unit and the circulating equipment to form a double-effect domestic hot water system.
3. The seasonal energy storage ground source heat pump refrigerating and heating system as claimed in claim 2, wherein: in the refrigeration period, the air conditioner refrigeration return water is used as a heat source to enter the evaporator, the freon working medium heat is absorbed, the freon working medium heat is pressurized and heated by the compressor, and then the high-temperature freon working medium is subjected to heat exchange with the hot water tank circulating water by the condenser to supply domestic hot water;
when the system heats, the heat pump unit and the hot water unit simultaneously use the heat reservoir after energy storage, the heat pump unit supplies heat for the building, and the hot water unit supplies hot water for the hot water tank.
4. The seasonal energy storage ground source heat pump refrigerating and heating system as claimed in claim 1, wherein: and an energy storage water tank in the energy station is matched with the heat exchanger and the hot water unit to form an electricity price difference water energy storage system.
5. The seasonal energy storage ground source heat pump refrigerating and heating system as claimed in claim 4, wherein: the electricity price difference water energy storage system electrically heats water in the water tank in an electricity heating mode at the electricity price valley time stage in the heating period; in the stage of peak electricity price in the heating period, hot water in the water tank provides a heat source to the tail end through the heat exchanger;
the electrovalence difference water energy storage system carries out cold accumulation operation at the electrovalence valley time stage in the cold supply period; and a cold source is provided to the tail end through the heat exchanger during the peak period of the electricity price in the cold supply period.
6. The seasonal energy storage ground source heat pump refrigerating and heating system as claimed in claim 1, wherein: the ground buried pipe in the ground buried pipe heat exchanger is U-shaped.
7. The method for refrigerating and heating by applying the seasonal energy storage ground source heat pump refrigerating and heating system of claims 1-6 is characterized in that: the method comprises the following steps:
firstly, determining a time period needing refrigeration and heating according to the actual condition of a system building local, calculating the difference value of the heat absorption quantity A and the heat release quantity B of the area, and calculating to obtain the unbalance value of the ground source energy of the area as | A-B |;
secondly, determining the cold and hot load capacity value of the energy station and the total length of the ground heat exchanger according to the unbalance value of the ground source energy as | A-B | and the building area needing refrigerating and heating;
thirdly, in the cold supply period, the circulating equipment absorbs external heat, the underground energy storage device stores energy in the heat reservoir, and meanwhile, the equipment in the energy station utilizes the temperature difference between the heat reservoir and the circulating medium to refrigerate the building; in the heating period, the underground energy storage device takes heat out of the heat reservoir and heats the building through the energy station; the whole energy application is balanced through auxiliary system when refrigerating and heating, reduces energy use cost.
8. The method for refrigerating and heating by using the seasonal energy storage ground source heat pump refrigerating and heating system according to claim 7, wherein the seasonal energy storage ground source heat pump refrigerating and heating system comprises: the total length (m) and the building area (m) of the ground heat exchanger2) The proportion of (A) is as follows: total length (m) of ground heat exchanger to building area (m)2)＝1∶1。
9. The method for refrigerating and heating by using the seasonal energy storage ground source heat pump refrigerating and heating system according to claim 7, wherein the seasonal energy storage ground source heat pump refrigerating and heating system comprises: the auxiliary system comprises a double-effect domestic hot water system and an electricity price difference water energy storage system.
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