CN102410597B - Ground source heat pump air-conditioning system device based on peak regulation and energy storage as well as control and operation method thereof - Google Patents
Ground source heat pump air-conditioning system device based on peak regulation and energy storage as well as control and operation method thereof Download PDFInfo
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- CN102410597B CN102410597B CN201110326154.6A CN201110326154A CN102410597B CN 102410597 B CN102410597 B CN 102410597B CN 201110326154 A CN201110326154 A CN 201110326154A CN 102410597 B CN102410597 B CN 102410597B
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Abstract
The invention discloses a ground source heat pump air-conditioning system device based on peak regulation and energy storage as well as a control and operation method thereof. Particularly, the system is divided into two parts including a connection structure of system parts and an operation and control model. An inlet pipeline and an outlet pipeline of an energy storage box are respectively connected with temperature sensors, a solenoid valve, convertible frequency water pumps, electromagnetic flow meters, a water collector and the like. Two groups of water source heat pump units are connected between the inlet pipeline and the outlet pipeline of the energy storage box in parallel; three groups of the convertible frequency water pumps are connected between the outlet pipeline and a water distributor in parallel; and pressure difference transmitters are connected with the input ends and the output ends of N groups of fan coils in parallel. Signal harnesses of a programmable controller are respectively connected with the convertible frequency water pumps, the water source heat pump units, two electromagnetic flow meters, three temperature sensors and three pressure difference transmitters. The control and operation model comprises three parts of assuring starting time and stopping time of energy storage of the system, assuring the starting time and the stopping time of regulating the peak and releasing the energy by an energy storage device, and controlling the energy storage and the energy releasing in a transition season. According to the invention, the system is configured with a set of intelligently-controlled operation scheme, so that the load rate at a peak time interval can be greatly reduced and the operation cost is reduced by about 12%.
Description
Technical field
The present invention relates to air conditioning system, be specifically related to utilize tou power price to carry out the geothermal heat pump air-conditioner Operation and control system of accumulation of energy.
Background technology
As everyone knows, the central air conditioner system of modern architecture is energy consumption rich and influential family, and its power consumption generally accounts for 40%～60% of whole building power load, and especially the energy consumption in summer also has the trend constantly rising, and that gives city has brought heavy pressure for distribution.Central air-conditioning for many Official Buildings buildings, has the advantages that concentrate service time, seaonal load is large, has increased the weight of network load peak of power consumption and low ebb and has differed larger contradiction.Summer air-conditioning peak times of power consumption, account for 30%～40% left and right of the total power load in city, and South China is unexpectedly up to more than 50%.
For heavy construction, after the load of its air-conditioning system and installed capacity are determined, the key of energy saving of system is that operation is controlled and the selection of equipment, and this will have influence on the economy of the long-term operation of system.Current central air conditioner system is continued to use traditional labor management mode and Simple switch control appliance mostly, owing to lacking advanced controlling run technology, wish realizes air-conditioning refrigerating (heat) fluid flow, and to follow the variation dynamic adjustments of end load very difficult, especially when electricity using at the peak time load does not mate, causes the waste of the energy and the operating cost of great number.Zhe Shi China energy for building inefficiency, unit building energy consumption exceeds 2-3 doubly than the developed country under equal weather conditions.In order to alleviate peak of power consumption and low power consumption imbalance problem, country carries out timesharing, and (daytime is peak electricity tariff; Be low ebb electricity price night, and the two differs huge many) electrovalence policy, encourage low-valley interval electricity consumption.Numerous units have adopted ice storage technology accordingly, that is: night cool storage medium is freezed, and discharge for air conditioner refrigerating daytime.After problem is to drop into ice cold-storage apparatus, from running technology and control model aspect, capacity usage ratio and operating cost are not optimized to design.Therefore propose a kind of rational operation and control technology, improve the energy utilization rate of system each several part equipment, can realize really effectively energy-conservation.This is that current building energy conservation is badly in need of the key issue solving, and in air conditioner energy saving field, has very important significance.
Summary of the invention
For the existing defect of current ice-chilling air conditioning system operation present situation, the object of the invention is to, a kind of geothermal heat pump air-conditioning system and regulation and control operation method thereof based on variable load accumulated is provided.
Below in conjunction with accompanying drawing, know-why of the present invention is described.Geothermal heat pump air-conditioning system based on variable load accumulated, comprises accumulation of energy case, temperature sensor, magnetic valve, variable frequency pump, electromagnetic flowmeter, water source heat pump units, ground heat exchanger, pressure difference transmitter, fan coil, water collector, water knockout drum and Programmable Logic Controller etc.The present invention is divided into syndeton and operation control model two parts of system unit.
Each parts form structure: accumulation of energy case outlet line is connected in series the first temperature sensor, magnetic valve, variable frequency pump, the first electromagnetic flowmeter and the second temperature sensor successively; Accumulation of energy case inlet line is connected in series magnetic valve, three-temperature sensor, the second electromagnetic flowmeter and water collector successively.Between accumulation of energy case import and export pipeline and be connected with 2 groups of water source heat pump units.Ground heat exchanger is connected in series with evaporimeter (winter) or condenser (summer) in variable frequency pump and water source heat pump units for return piping; Between accumulation of energy case outlet line and water knockout drum and connect 3 groups of variable frequency pumps; Pressure difference transmitter be connected in N group fan coil into and out of end.Between water knockout drum and water collector, by magnetic valve, be connected; Water knockout drum outlet is connected with fan coil import; Water collector import is connected with fan coil outlet.The signal wire harness of Programmable Logic Controller is connected to respectively variable frequency pump, water source heat pump units, two electromagnetic flowmeters, three temperature sensors and pressure difference transmitter.
System regulation operational mode comprises 3 parts:
(1) the system accumulation of energy start-stop time is determined
During system stable operation, the data acquisition equipment in Programmable Logic Controller always gathers storage for circling water flow rate, temperature and each space air mean temperature, humidity data by all air-conditioned room N groups of the same day and first two days end fan coil; To next day air-conditioned room by time the q (τ) that loads carry out simulation and forecast; Calculate the high crest segment demand of building load next day Q.By saving operating cost function
calculate, obtain maximum, determine accumulation of energy required time section duration t.
F wherein
1electricity price during for peak; f
2electricity price during for low ebb.COP
1(τ) be air-conditioning period unit performance coefficient; COP
2(τ) be accumulation of energy period unit performance coefficient.P
2(τ) be accumulation of energy period source pump power.M
1the time started of electricity price during for local low ebb; m
2the end time of electricity price during for local low ebb.Work as m
2-m
1during>=t, system accumulation of energy Startup time is m
2-t, stopping is m constantly
2; Work as m
2-m
1during < t, accumulation of energy Startup time is m
1, stopping is m constantly
2.
(2) the energy storage equipment peak regulation exoergic start-stop time is determined
Data acquisition equipment in Programmable Logic Controller by time gather the total freezing water supply of fan coil, freezing return water temperature, flow, determine and now build required load q ' (τ).If water source heat pump units rated load is q
0, when satisfy condition q ' (τ)>=nq
0, freezing return water temperature is when surpassing 12 ℃, environment temperature and surpassing T, energy storage equipment exoergic starts, and now builds required load with water source heat pump units shared.Accumulation of energy case inlet water temperature is T
1, outlet water temperature is T
2, work as T
2>=T
1or the total return water temperature of chilled water is while surpassing 12 ℃, stops exoergic, by water source heat pump units independent operating, is born.N is proportionality constant, according to the applicable cases of source pump, determines, and reference value 85%～95%, establishing building load peak factor is that 1, T is the environment temperature that building load coefficient surpasses 0.9 o'clock.
(3) transition season holds exoergic regulation and control
If electricity price period when transition season building peak load enters peak is closed water source heat pump units, start energy storage equipment independent operating.Until accumulation of energy case outlet temperature T
2during lower than 35 ℃, stop energy storage equipment operation higher than 12 ℃, winter summer, opens water source heat pump units independent operating.
Information acquisition module first carries out real time data collection by Temperature Humidity Sensor, resistance temperature detector, pressure difference transmitter, electromagnetic flow transducer etc. to each key component, then the data of collection being carried out to A/D conversion passes to load prediction module simultaneously and optimizes computing module, now prediction module is predicted Future Data, and the prediction data obtaining is passed optimization computing module again back, optimizing computing module is optimized and obtains rational output after calculating and pass to decision-making module the prediction data from load prediction module and information acquisition module and real data, decision-making module makes a policy these outputs and the rule base contrast of design in advance, last decision scheme passes to message output module to carry out by working control amount, giving executing agency after corresponding D/A conversion and carries out, the result of simultaneously carrying out is given to optimize with decision center by various sensor feedback again and is entered and optimize next time and regulate, the peak regulation of finally realizing expectation by this loop control subtracts expense operational mode.
The good effect of feature of the present invention and generation is, system forms the running technology scheme of a set of Based Intelligent Control of configuration, can significantly subdue the rate of load condensate of peak period, reduces operating cost 20% left and right.Compared with prior art, the beneficial effect of generation is:
(1) by controlling run scheme, making full use of the trough-electricity time period carries out maximum accumulation of energy, makes every effort to fully be utilized at high crest segment as far as possible, and alleviated the hottest and winter in the summer electricity cost of the coldest period reduces network load simultaneously.
(2) regulon that this operating scheme needs is few, mainly concentrates in core algorithm and data acquisition, is conducive to the technological transformation for current air-conditioning system.
(3) operation and management mode is simple, controls precision high, and easily controls.
(4) auxiliary due to energy storage equipment, makes geothermal heat pump air-conditioning system operating load steady, eliminates the overload operation of bringing because of climate change, has improved efficiency of energy utilization.
Accompanying drawing explanation
Fig. 1 is system unit theory of constitution structure diagram of the present invention.
Fig. 2 is accumulation of energy box structure sketch.
Fig. 3 is control program logic operation key diagram.
The specific embodiment
Below in conjunction with accompanying drawing and by embodiment, the present invention is described further.It should be noted that, the present embodiment is narrative, is not determinate, with this embodiment, does not limit protection scope of the present invention.
Geothermal heat pump air-conditioning system device based on variable load accumulated, as shown in Figure 1: accumulation of energy case 4 outlet lines are connected in series the first temperature sensor 8-1, the first magnetic valve 7-1, the first variable frequency pump 1-1, the first electromagnetic flowmeter 3-1 and the second temperature sensor 8-2 successively; Accumulation of energy case inlet line is connected in series the second magnetic valve 7-2, three-temperature sensor 8-3, the second electromagnetic flowmeter 3-2 and water collector 11 successively.Between accumulation of energy case import and export pipeline and be connected with 2 groups of water source heat pump units (2), and 2 groups of water source heat pump units serial connection the 3rd magnetic valve 7-3 are to accumulation of energy case inlet line.Ground heat exchanger 5 is connected in series with evaporimeter (winter) or condenser (summer) in the second variable frequency pump 1-2 and water source heat pump units for return piping.Between accumulation of energy case outlet line and water knockout drum 10 and meet 3 groups of variable frequency pump 1-3,1-4,1-5 and be connected in series a 4th magnetic valve 7-4.Pressure difference transmitter 9 be connected in N group fan coil 6 into and out of end, between water knockout drum and water collector 11, by the 5th magnetic valve 7-5, be connected.Water knockout drum outlet is connected with fan coil import, and water collector import is connected with fan coil outlet.The signal wire harness of Programmable Logic Controller 12 is connected to respectively the first variable frequency pump 1-1, water source heat pump units 2, two electromagnetic flowmeter 3-1～3-2, three temperature sensor 8-1～8-3 and pressure difference transmitter 9.
The method of the geothermal heat pump air-conditioning system regulation and control operation based on variable load accumulated, comprises the following steps process:
(1) the system accumulation of energy start-stop time is determined
During system stable operation, the data acquisition equipment in Programmable Logic Controller always gathers storage for circling water flow rate, temperature and each space air mean temperature, humidity data by all air-conditioned room N groups of the same day and first two days end fan coil; To next day air-conditioned room by time the q (τ) that loads carry out simulation and forecast; Calculate the high crest segment demand of building load next day Q.By saving operating cost function
calculate, obtain maximum, determine accumulation of energy required time section duration t.
F wherein
1electricity price during for peak; f
2electricity price during for low ebb.COP
1(τ) be air-conditioning period unit performance coefficient; COP
2(τ) be accumulation of energy period unit performance coefficient.P
2(τ) be accumulation of energy period source pump power.M
1the time started of electricity price during for local low ebb; m
2the end time of electricity price during for local low ebb.Work as m
2-m
1during>=t, system accumulation of energy Startup time is m
2-t, stopping is m constantly
2; Work as m
2-m
1during < t, accumulation of energy Startup time is m
1, stopping is m constantly
2.
(2) the energy storage equipment peak regulation exoergic start-stop time is determined
Data acquisition equipment in Programmable Logic Controller by time gather the total freezing water supply of fan coil, freezing return water temperature, flow, determine and now build required load q ' (τ).If water source heat pump units rated load is q
0, when satisfy condition q ' (τ)>=nq
0, freezing return water temperature is when surpassing 12 ℃, environment temperature and surpassing T, energy storage equipment exoergic starts, and now builds required load with water source heat pump units shared.Accumulation of energy case inlet water temperature is T
1, outlet water temperature is T
2, when
t 2 >=T 1 or the total return water temperature of chilled water is while surpassing 12 ℃, stops exoergic, by water source heat pump units independent operating, is born.N is proportionality constant, according to the applicable cases of source pump, determines, and reference value 85%～95%, establishing building load peak factor is that 1, T is the environment temperature that building load coefficient surpasses 0.9 o'clock.
(3) transition season holds exoergic regulation and control
If electricity price period when transition season building peak load enters peak is closed water source heat pump units, start energy storage equipment independent operating.Until accumulation of energy case outlet temperature T
2during lower than 35 ℃, stop energy storage equipment operation higher than 12 ℃, winter summer, opens water source heat pump units independent operating.
The accumulation of energy effect of accumulation of energy case directly has influence on the operating cost of system, and accumulation of energy case is designed to the hierarchy shown in Fig. 2, four baffle plates is set in case and makes chilled water flow to strengthen hot and cold water along assigned direction to hold the layered effect of letting slip in journey; The vertical range of first baffle plate of X indication device tip to face distance in Fig. 2, vertical range, the Z of the 3rd baffle plate of Y indication device tip to face distance represents to form the vertical height that vertical range, M between first baffle plate of slit and second baffle plate represent baffle plate, and four baffle plate physical dimensions are the same.As shown in Figure 3, concrete data are by being with touching display screen to show in real time for the TT&C system flow process of Programmable Logic Controller.
Embodiment construction area is 120m altogether
2, the about 9kW of refrigeration duty in summer, the about 6kW of thermic load in winter.Supporting earth-source hot-pump system general power is 3.2kw, 6, type of system configuration fan coil FP-34 (N=6), the specified refrigerating capacity 1800w of separate unit.According to conventional air-conditioning pattern, 3 months summer air-conditioning time, 4 months heat supply in winter time, system average operating time every day 10 hours, summer power consumption approximately 1728 degree, winter power consumption approximately 1920 degree.During according to business electricity consumption peak, Tianjin, electricity price is 1.213 yuan/degree; During paddy, electricity price is 0.393 yuan/degree.For source heat pump air-conditioning system routinely, running time section in section in rush hour, approximately 4425 yuan of annual operating costs.And utilize system of the present invention, after controlling by variable load accumulated operation, hold exoergic time ratio: be 6/5 winter; Be 4/3 summer, approximately 3897.2 yuan of whole year operation expenses.Save operating cost: 527.8 yuan/year, can realize the air-conditioning system operating cost of saving 12% left and right.
Claims (2)
1. the geothermal heat pump air-conditioning system based on variable load accumulated, comprise accumulation of energy case, temperature sensor, magnetic valve, variable frequency pump, electromagnetic flowmeter, water source heat pump units, ground heat exchanger, pressure difference transmitter, fan coil, water collector, water knockout drum and Programmable Logic Controller, it is characterized in that, accumulation of energy case (4) outlet line is connected in series the first temperature sensor (8-1), the first magnetic valve (7-1), the first variable frequency pump (1-1), the first electromagnetic flowmeter (3-1) and the second temperature sensor (8-2) successively, accumulation of energy case (4) inlet line is connected in series the second magnetic valve (7-2) successively, three-temperature sensor (8-3), the second electromagnetic flowmeter (3-2) and water collector (11), accumulation of energy case (4) enters, between outlet line and be connected with 2 groups of water source heat pump units (2), and 2 groups of water source heat pump units serial connection the 3rd magnetic valves (7-3) are to accumulation of energy case inlet line, ground heat exchanger (5) is connected in series with evaporimeter or condenser in the second variable frequency pump (1-2) and water source heat pump units (2) for return piping, between accumulation of energy case (4) outlet line and water knockout drum (10) and meet 3 groups of variable frequency pump (1-3, 1-4, 1-5) with the 4th magnetic valve (7-4) of serial connection, pressure difference transmitter (9) is connected in entering of N group fan coil (6), go out end, between water knockout drum (10) and water collector (11), by the 5th magnetic valve (7-5), be connected, water knockout drum (10) outlet is connected with fan coil (6) import, water collector (11) import is connected with fan coil (6) outlet, the signal wire harness of Programmable Logic Controller (12) is connected to respectively the first variable frequency pump (1-1), water source heat pump units (2), two electromagnetic flowmeters (3-1～3-2), three temperature sensors (8-1～8-3) and pressure difference transmitter (9).
2. according to the geothermal heat pump air-conditioning system based on variable load accumulated claimed in claim 1, it is characterized in that system regulation operation comprises the steps and process:
(1) the system accumulation of energy start-stop time is determined
During system stable operation, the data acquisition equipment in Programmable Logic Controller always gathers storage for circling water flow rate, temperature and each space air mean temperature, humidity data by all air-conditioned room N groups of the same day and first two days end fan coil;
To next day air-conditioned room by time the q (τ) that loads carry out simulation and forecast;
Calculate the high crest segment demand of building load next day Q,
By saving operating cost function
calculate, obtain maximum, determine accumulation of energy required time section duration t,
F wherein
1electricity price during for peak; f
2electricity price during for low ebb, COP
1(τ) be air-conditioning period unit performance coefficient; COP
2(τ) be accumulation of energy period unit performance coefficient; P
2(τ) be accumulation of energy period source pump power,
M
1the time started of electricity price during for local low ebb; m
2during for local low ebb, the end time of electricity price, works as m
2-m
1during>=t, system accumulation of energy Startup time is m
2-t, stopping is m constantly
2, work as m
2-m
1during < t, accumulation of energy Startup time is m
1, stopping is m constantly
2;
(2) the energy storage equipment peak regulation exoergic start-stop time is determined
Data acquisition equipment in Programmable Logic Controller by time gather the total freezing water supply of fan coil, freezing return water temperature, flow;
Determine and now build required load q ' (τ); Water source heat pump units rated load is q
0,
When satisfy condition q ' (τ)>=nq
0, freezing return water temperature is when surpassing 12 ℃, environment temperature and surpassing T, energy storage equipment exoergic starts, and now builds required load with water source heat pump units shared; N is proportionality constant, reference value 85%～95%; T is the environment temperature that building load coefficient surpasses 0.9 o'clock,
Accumulation of energy case inlet water temperature is T
1, outlet water temperature is T
2, work as T
2>=T
1or the total return water temperature of chilled water is while surpassing 12 ℃, stops exoergic, by water source heat pump units independent operating, is born;
(3) transition season holds exoergic regulation and control
If electricity price period when transition season building peak load enters peak is closed water source heat pump units, start energy storage equipment independent operating, until accumulation of energy case outlet temperature T
2during lower than 35 ℃, stop energy storage equipment operation higher than 12 ℃, winter summer, opens water source heat pump units independent operating.
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| CN103277855B (en) * | 2013-05-29 | 2016-06-08 | 赖正伦 | A kind of distributed energy-accumulation control method and accumulation of energy device thereof |
| CN103438519B (en) * | 2013-08-22 | 2015-11-18 | 机械工业第三设计研究院 | Pipeline energy storage system |
| CN103913023B (en) * | 2014-03-10 | 2016-01-20 | 重庆大学 | The circular flow control method of earth-source hot-pump system |
| CN108154258B (en) * | 2017-11-27 | 2021-11-05 | 国网北京市电力公司 | Method and device for predicting load of air source heat pump, storage medium and processor |
| CN108120191B (en) * | 2017-12-18 | 2020-06-19 | 新智能源系统控制有限责任公司 | Advanced control system and method for cooling unit for realizing demand side response |
| CN110220237B (en) * | 2019-06-21 | 2023-10-20 | 北京新能乐业科技有限公司 | Combined heat supply system and method of air source heat pump unit and heat accumulating type electric heating device |
| CN110821035A (en) * | 2019-11-08 | 2020-02-21 | 中国计量大学 | Wall panel based on solid phase-change material and capillary radiant tube and temperature adjusting method thereof |
| CN111550861B (en) * | 2020-05-19 | 2021-08-20 | 山东建筑大学 | Self-adaptive optimization control method, system and device for heat pump and electric heat storage equipment |
| CN113865166A (en) * | 2021-03-31 | 2021-12-31 | 合肥工业大学 | Cooling and heating system strategy optimization based on energy balance and load rate of each energy supply unit |
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