CN106016532A - Ground source heat pump system and starting and stopping control method of cooling towers - Google Patents
Ground source heat pump system and starting and stopping control method of cooling towers Download PDFInfo
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- CN106016532A CN106016532A CN201610345505.0A CN201610345505A CN106016532A CN 106016532 A CN106016532 A CN 106016532A CN 201610345505 A CN201610345505 A CN 201610345505A CN 106016532 A CN106016532 A CN 106016532A
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- Prior art keywords
- cooling tower
- heat pump
- ground source
- underground pipe
- ground
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Classifications
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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
- F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Other Air-Conditioning Systems (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a ground source heat pump air conditioner system and a starting and stopping control method of cooling towers. The ground source heat pump air conditioner system comprises a ground source heat pump host, the cooling towers, a buried pipe, a water pump and a controller; the controller controls starting and stopping of the cooling towers, the buried pipe and the ground source heat pump host; the system is characterized in that after the ground source heat pump system begins to operate, the controller controls whether the cooling towers are started or not according to the difference delta T between the set water inlet temperature of the ground source side host and the temperature of outdoor air wet bulbs; when the cooling towers are started, the buried pipe is closed within the set time segment; after the buried pipe is started again, according to the set water inlet and outlet temperature difference delta t of the ground source side host, whether the cooling towers are stopped or not is controlled; and according to the system and the control method, the heat balance of soil all year round is maintained, under the operation mode, heat gain of the soil in the summer is roughly equal to heat exhaust in the winter, after the running period, the temperature of the soil is almost kept unchangeable, and high efficiency and energy saving of operation of the ground source heat pump system are ensured.
Description
Technical field
The present invention relates to geothermal heat pump air-conditioner technical field, a kind of on off control method of earth-source hot-pump system and cooling tower.
Background technology
In recent years, geothermal heat pump air-conditioning system utilize this regenerative resource of underground heat due to it and have at energy-saving square mask the most excellent
Get over property and be employed in engineering reality more and more.But in In Middle And Lower Reaches of Changjiang River, the summer of same building is cold negative
Lotus is typically much deeper than thermic load in its in winter, if being used alone geothermal heat pump air-conditioning system, certainly will cause the heat extraction to soil in the summer
Amount, much larger than the caloric receptivity from soil in the winter, causes soil mean temperature constantly to rise, affects the heat exchange efficiency of ground heat exchanger,
The Energy Efficiency Ratio of reduction system, can make a big impact to energy saving.
Along with the progress of science and technology, research worker finds that adding cooling tower in earth-source hot-pump system assists heat radiation in its summer to make
The system of obtaining is greatly reduced to the heat exhaust of soil summer, can preferably solve soil heat balance problem, but existing the most frequently used
The control method of cooling tower is opened in set time interval it cannot be guaranteed that cooling tower is constantly in efficient running status, also cannot be more smart
Really control the annual thermal balance picking and placeing heat to soil.
Composite ground source heat pump system and the operation thereof of the auxiliary heat extraction of document entitled cooling tower control, and article describe with wet bulb temperature
The control foundation enabled for cooling tower with the difference 2 DEG C and 1.5 DEG C of pipe laying leaving water temperature and disable, the method can make cooling tower and whole
The operational efficiency of system maintains the state that comparison is high, but cannot maintain annual soil heat balance the most accurately.
Application number: CN201110076045.3 entitled earth source heat pump self adaptation thermal equilibrium control system, this system utilizes wet bulb temperature
Degree and the difference of pipe laying leaving water temperature control cooling tower start and stop, and calculate annual soil total pick and place heat, but adaptive
Although it is roughly the same that method can solve soil year in later stage to pick and place heat, but several years ago soil temperature rise may be caused very fast.
Summary of the invention
The technical problem to be solved is to provide and a kind of makes air conditioning system be constantly in the running status that efficiency is higher, the most relatively
Maintain well annual soil heat balance based on geothermal heat pump air-conditioning system and the cooling tower on off control of annual soil heat balance
Method.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of geothermal heat pump air-conditioning system, including ground-source heat pump host, cooling tower, underground pipe, water pump and a controller, institute
Stating cooling tower and underground pipe in being connected in the two ends of ground-source heat pump host in parallel, described controller controls described cooling tower and described
Pipe laying and the open and close of described ground-source heat pump host, it is characterised in that: described controller, start fortune at earth-source hot-pump system
After row, control whether cooling tower is opened according to the difference Δ T of the ground source main frame inflow temperature set with outdoor air wet bulb temperature；
When cooling tower is opened, within the time period set, close underground pipe；After underground pipe reopens, according to the ground source set
Main frame Inlet and outlet water temperature difference t controls whether cooling tower closes.
The difference Δ T of the ground source main frame inflow temperature set and outdoor air wet bulb temperature is as 4 DEG C.This temperature difference setting value is the highest,
It is the shortest that cooling tower runs the time, and energy consumption is the fewest, and the COP of system is first to increase to reduce afterwards, at hot-summer and cold-winter area almost at 4 DEG C
Time obtain maximum.And set 4 degree of temperature difference and both can avoid the too low cooling tower frequent start-stop caused of temperature difference setting value, again may be used
The effect of soil heat balance is preferably maintained to avoid the too high cooling tower that causes of temperature difference setting value to run time the shortest not reaching.
The time period set was as 2 hours.The time interval of underground pipe interval is the biggest, and it is the longest that cooling tower runs the time, cooling tower energy
Consume the biggest, and the energy consumption of unit is first to reduce then to increase, about systematic energy efficiency ratio underground pipe intermittent duty 2 hours when
The highest.Therefore after cooling tower is opened, allowing underground pipe rest 2 hours and rerun, recovery and system for the soil moisture are overall
The lifting of COP is the most favourable.
Ground source main frame Inlet and outlet water temperature difference t set is as 5 DEG C.The ground source main frame Inlet and outlet water temperature difference can reflect that building is cold indirectly
The size of load, when the temperature difference is less than 5 DEG C, underground pipe can all condense heat radiation with alone bear；But building is negative as Δ t ＞ 5 DEG C
Lotus is relatively big, and condenser heat radiation is relatively big, and underground pipe may affect system energy efficiency if individually undertaking, and the most now wouldn't close cooling
Tower, when refrigeration duty diminishes underground pipe alone bear condensation heat radiation no pressure, turns off cooling tower, has both maintained system high energy efficiency,
It is avoided that again cooling tower frequent start-stop.
A kind of cooling tower on off control method based on geothermal heat pump air-conditioning system, step is:
After step 1, earth-source hot-pump system bring into operation, detection ground source main frame inflow temperature and the difference of outdoor air wet bulb temperature
Δ T, if Δ T ＜ 4 DEG C, is not turned on cooling tower；If Δ T >=4 DEG C, open cooling tower and carry out auxiliary heat dissipation；
After step 2, cooling tower are opened, close underground pipe loop immediately, within 2 hours, reactivate underground pipe loop later；
After step 3, underground pipe loop put back into, detection ground source main frame Inlet and outlet water temperature difference t, if Δ t ＞ 5 DEG C,
Maintain cooling tower opening and together undertake heat radiation with making itself and underground pipe；If Δ t≤5 DEG C, now close cooling tower, return
Step 1.
The present invention is by studying optimal time interval and the outdoor air wet bulb temperature shadow to system energy consumption of underground pipe intermittent duty
Ring, it is determined that the condition started for cooling tower with the difference of source main frame inflow temperature Yu wet bulb temperature, the most ordinatedly between pipe laying
Have a rest run control method.
Beneficial effect
1, ensure that cooling tower is in the state of high-efficiency operation all the time, promote systematic function.
2, ground heat exchanger and cooling tower intermittent duty, had both avoided cooling tower frequent start-stop, and can make again the heat of soil sometimes
Between be diluted, temperature is stabilized.
3, maintain annual soil heat balance so that under this operational mode, soil obtain summer heat and winter heat exhaust roughly equal,
After cycle of operation, the soil moisture almost remains unchanged, it is ensured that the high efficiency of earth-source hot-pump system operation and energy saving.
Accompanying drawing explanation
Fig. 1 is earth-source hot-pump system schematic diagram of the present invention；
Fig. 2 is control method schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the present invention is elaborated:
As it is shown in figure 1, one geothermal heat pump air-conditioning system of the present invention, including ground-source heat pump host 1, cooling tower 2, underground pipe
3, water pump 4 and a controller 5, cooling tower 2 and underground pipe 3 are in the two ends being connected in ground-source heat pump host 1 in parallel.?
Ground-source heat pump host 1 import and export is respectively mounted temperature sensor, and places wet bulb thermometer in locality, earth source heat pump master
Effusion meter is installed by machine 1 import department.
Controller, after earth-source hot-pump system brings into operation, according to the ground source main frame inflow temperature set and outdoor air wet bulb
Temperature difference Δ T controls whether cooling tower is opened；When cooling tower is opened, within the time period set, close underground pipe；On ground
After pipe laying reopens, ground source main frame Inlet and outlet water temperature difference t according to setting controls whether cooling tower closes.
A kind of cooling tower on off control method based on geothermal heat pump air-conditioning system of the present invention, concrete grammar is:
(1), after earth-source hot-pump system brings into operation, cooling tower is not yet turned on, now detect ground source main frame inflow temperature with
The difference Δ T of outdoor air wet bulb temperature, if Δ T ＜ 4 DEG C, it is believed that underground pipe would be properly functioning, it is not necessary to open cooling tower；If
Δ T >=4 DEG C, now think underground pipe heat radiation over-burden, open cooling tower carry out auxiliary heat dissipation.
(2), after cooling tower is opened, close underground pipe loop 2 hours immediately, make it rest to recover heat-sinking capability.2 hours
Later underground pipe loop is reactivated.
(3) after underground pipe loop puts back into, detection ground source main frame Inlet and outlet water temperature difference t, if Δ t ＞ 5 DEG C, then it is assumed that
System is in large load operation state, and maintenance cooling tower opening together undertakes heat radiation with making itself and underground pipe；If Δ t≤
5 DEG C, then it is assumed that system is in general load operating region, now close cooling tower, return step (1).
Embodiment:
This earth-source hot-pump system chiller capacity 270kW, heating capacity 300kW, freeze electric rating 51.6W, heats specified electricity
Power 49.1kW, selects the closed cooling tower of a 300kW.
The power load distributing that unit ran within a refrigeration phase is:
Then under this operational mode, in the refrigeration phase, the cooling tower operation time is 820h, and cooling tower auxiliary heat dissipation amount is 24.6 ten thousand thousand
Watt-hour, is about 13.1 ten thousand kilowatt hours to soil heat exhaust summer, and winter is about 11.3 ten thousand kilowatt hours, summer in winter to soil heat exhaust
Season soil to pick and place heat ratio be 0.863, run soil temperature rise in a year within 0.3 DEG C.
Claims (5)
1. a geothermal heat pump air-conditioning system, including ground-source heat pump host, cooling tower, underground pipe, water pump and a controller, described cooling tower and underground pipe are in the two ends being connected in ground-source heat pump host in parallel, described controller controls the open and close of described cooling tower and described underground pipe and described ground-source heat pump host, it is characterized in that: described controller, after earth-source hot-pump system brings into operation, control whether cooling tower is opened according to the difference Δ T of the ground source main frame inflow temperature set with outdoor air wet bulb temperature；When cooling tower is opened, within the time period set, close underground pipe；After underground pipe reopens, ground source main frame Inlet and outlet water temperature difference t according to setting controls whether cooling tower closes.
Geothermal heat pump air-conditioning system the most according to claim 1, it is characterised in that: the difference Δ T of the ground source main frame inflow temperature set and outdoor air wet bulb temperature is as 4 DEG C.
Geothermal heat pump air-conditioning system the most according to claim 1, it is characterised in that: the time period set was as 2 hours.
Geothermal heat pump air-conditioning system the most according to claim 1, it is characterised in that: ground source main frame Inlet and outlet water temperature difference t set is as 5 DEG C.
5. a cooling tower on off control method based on geothermal heat pump air-conditioning system, it is characterised in that: step is:
After step 1, earth-source hot-pump system bring into operation, detection ground source main frame inflow temperature and the difference Δ T of outdoor air wet bulb temperature, if Δ T ＜ 4 DEG C, it is not turned on cooling tower；If Δ T >=4 DEG C, open cooling tower and carry out auxiliary heat dissipation；
After step 2, cooling tower are opened, close underground pipe loop immediately, within 2 hours, reactivate underground pipe loop later；
After step 3, underground pipe loop put back into, detection ground source main frame Inlet and outlet water temperature difference t, if Δ t ＞ 5 DEG C, maintenance cooling tower opening together undertakes heat radiation with making itself and underground pipe；If Δ t≤5 DEG C, now close cooling tower, return step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345505.0A CN106016532A (en) | 2016-05-23 | 2016-05-23 | Ground source heat pump system and starting and stopping control method of cooling towers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345505.0A CN106016532A (en) | 2016-05-23 | 2016-05-23 | Ground source heat pump system and starting and stopping control method of cooling towers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106016532A true CN106016532A (en) | 2016-10-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610345505.0A Pending CN106016532A (en) | 2016-05-23 | 2016-05-23 | Ground source heat pump system and starting and stopping control method of cooling towers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488972A (en) * | 2018-04-03 | 2018-09-04 | 安徽郁金香新能源科技有限公司 | A kind of control method of cooling tower assisted ground source heat pump system that pressing four state optimizations |
Citations (4)
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2016
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Patent Citations (4)
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| CN201652992U (en) * | 2010-05-19 | 2010-11-24 | 北京依科瑞德地源科技有限责任公司 | Hybrid ground-source heat pump system |
| CN102840725A (en) * | 2012-09-27 | 2012-12-26 | 山东中瑞新能源科技有限公司 | Control system and method of buried pipe and cooling tower ground source heat pump compound system |
| CN103363723A (en) * | 2013-07-25 | 2013-10-23 | 湖南大学 | Active recovery system and active recovery method for balancing heat extraction and heat removal of ground heat exchanger |
| CN203964238U (en) * | 2014-07-18 | 2014-11-26 | 上海盛庐节能机电有限公司 | A kind of auxiliary cooling combined earth-source hot-pump system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488972A (en) * | 2018-04-03 | 2018-09-04 | 安徽郁金香新能源科技有限公司 | A kind of control method of cooling tower assisted ground source heat pump system that pressing four state optimizations |
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Application publication date: 20161012 |