CN102410597A - 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 PDF

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CN102410597A
CN102410597A CN2011103261546A CN201110326154A CN102410597A CN 102410597 A CN102410597 A CN 102410597A CN 2011103261546 A CN2011103261546 A CN 2011103261546A CN 201110326154 A CN201110326154 A CN 201110326154A CN 102410597 A CN102410597 A CN 102410597A
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water
energy
heat pump
accumulation
source heat
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CN102410597B (en
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朱家玲
胡涛
张伟
朱晓明
付文成
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Tianjin University
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Tianjin University
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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

Based on variable load accumulated geothermal heat pump air-conditioning system device and regulation and control operation method thereof
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 the control system of accumulation of energy.
Background technology
As everyone knows, the central air conditioner system of modern architecture is the 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 that constantly rises, and has brought heavy pressure for the confession distribution in city.Central air-conditioning for many office building class buildings has the advantages that concentrate service time, seaonal load is big, has increased the weight of network load peak of power consumption and low ebb and has differed bigger contradiction.Summer air-conditioning peak times of power consumption account for about 30%~40% of the total power load in city, and the South China is unexpectedly up to more than 50%.
For heavy construction, after the load of its air-conditioning system and installed capacity were confirmed, the key of energy saving of system was operation control and equipments choice, and this will have influence on the economy of system's long-time running.Present central air conditioner system is continued to use conventional artificial way to manage and simple and easy switching control device mostly; Owing to lack advanced control running technology; Desire realizes that air-conditioning carries then unusual difficulty of variation dynamic adjustments that cold (heat) fluid flow follows terminal load, especially causes the waste of the energy and the operating cost of great number at the electricity using at the peak time load when not matching.This makes China's energy for building inefficiency, and the unit building energy consumption exceeds 2-3 doubly than the developed country under the equal weather conditions.In order to alleviate peak of power consumption and low power consumption imbalance problem, country carries out timesharing, and (daytime is a peak electricity tariff; Be the low ebb electricity price night, and the two differs huge many) electrovalence policy, encourage the low-valley interval electricity consumption.Numerous in view of the above units have adopted ice storage technology, that is: night cool storage medium is freezed, and discharge daytime to be used for air conditioner refrigerating.Problem is to drop into after the ice cold-storage apparatus, from running technology and control model aspect capacity usage ratio and operating cost is not optimized design.Therefore propose a kind of rational operation and control technology, improve the energy utilization rate of system's each several part equipment, can realize real effective energy-saving.This is the key issue that present building energy conservation is badly in need of solution, has very important significance in the air conditioner energy saving field.
Summary of the invention
To the existing defective of present ice-chilling air conditioning system operation present situation, the objective of the invention is to, provide a kind of based on variable load accumulated geothermal heat pump air-conditioning system and regulation and control operation method thereof.
Below in conjunction with accompanying drawing know-why of the present invention is described.Based on variable load accumulated geothermal heat pump air-conditioning system, 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 etc.The present invention is divided into the syndeton and operation control model two parts of system unit.
Each parts is formed structure: accumulation of energy case outlet line is connected in series first temperature sensor, magnetic valve, variable frequency pump, first electromagnetic flowmeter and second temperature sensor successively; Accumulation of energy case inlet line is connected in series magnetic valve, three-temperature sensor, 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 supplies return piping to be connected in series with evaporimeter (winter) or condenser (summer) in variable frequency pump and the water source heat pump units; Between accumulation of energy case outlet line and the 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.Be connected through magnetic valve between water knockout drum and the water collector; The water knockout drum outlet is connected with the fan coil import; The water collector import is connected with the fan coil outlet.The signal wire harness of Programmable Logic Controller is connected to variable frequency pump, water source heat pump units, two electromagnetic flowmeters, three temperature sensors and pressure difference transmitter respectively.
The system regulation operational mode comprises 3 parts:
(1) system's accumulation of energy start-stop time is confirmed
During system stable operation, the data acquisition equipment in the Programmable Logic Controller with the same day and preceding two days terminal all air-conditioned room N group fan coils always supply circling water flow rate, temperature and each space air mean temperature, humidity data to gather storage; To next day air-conditioned room carry out simulation and forecast by time load q (τ); Calculate the high crest segment demand of building load next day Q.By saving the operating cost function F Max = ∫ 0 t P 2 ( τ ) · ( COP 2 ( τ ) COP 1 ( τ ) · f 1 - f 2 ) Dτ Calculate, obtain maximum, confirm accumulation of energy required time section duration t.
F wherein 1Electricity price during for the 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 concluding time of electricity price during for local low ebb.Work as m 2-m 1During>=t, it is m that system's accumulation of energy starts constantly 2-t stops to be constantly m 2Work as m 2-m 1During<t, it is m that accumulation of energy starts constantly 1, stop to be constantly m 2
(2) the energy storage equipment peak regulation exoergic start-stop time is confirmed
Gather the total freezing water supply of fan coil, freezing return water temperature, flow when pursuing, confirm to build required load q ' (τ) this moment by the data acquisition equipment in the Programmable Logic Controller.If the water source heat pump units rated load is q 0, when satisfy condition q ' (τ)>=nq 0, freezing return water temperature surpasses 12 ℃, when environment temperature surpasses T, the energy storage equipment exoergic starts, and bears jointly with water source heat pump units and builds required load this moment.Accumulation of energy case inlet water temperature is T 1, the outlet water temperature is T 2, work as T 2>=T 1Or the total return water temperature of chilled water stops exoergic when surpassing 12 ℃, born by the water source heat pump units independent operating.N is a proportionality constant, decides according to the applicable cases of source pump, and reference value 85%~95%, establishing the building load peak factor is 1, T surpasses 0.9 o'clock environment temperature for the building load coefficient.
(3) transition season holds the exoergic regulation and control
Electricity price period when transition season is built peak load as if the entering peak, close water source heat pump units, start the energy storage equipment independent operating.Up to accumulation of energy case outlet temperature T 2Be higher than 12 ℃, winter summer when being lower than 35 ℃, stop the energy storage equipment operation, open the water source heat pump units independent operating.
Information acquisition module carries out real time data through Temperature Humidity Sensor, resistance temperature detector, pressure difference transmitter, electromagnetic flow transducer etc. to each key component earlier and collects; Then the data of gathering are carried out the A/D conversion and pass to load prediction module and optimizing calculation module simultaneously; This moment, prediction module predicted that to following data the prediction data that obtains is passed optimizing calculation module again back; Optimizing calculation module is passed to decision-making module to being optimized from the prediction data of load prediction module and information acquisition module and real data reasonably to be exported after the calculating; Decision-making module makes a policy these outputs and designed regular storehouse contrast in advance; Last decision scheme passes to message output module to carry out giving executing agency with the working control amount after corresponding D/A conversion and carries out; The result who carries out is simultaneously optimized and adjusting for optimization and decision center entering by various sensor feedback again next time, finally realizes that through this loop control the peak regulation of expecting subtracts the expense operational mode.
The good effect of characteristics of the present invention and generation is that system forms the running technology scheme of configuration one cover Based Intelligent Control, can significantly subdue the rate of load condensate of peak period, reduces operating cost about 20%.Compared with prior art, the beneficial effect of generation is:
(1) through the control operating scheme, make full use of the low ebb electricity and carry out maximum accumulation of energy the time period, to make every effort to fully to obtain utilizing at high crest segment as far as possible, alleviated the hottest and winter in the summer electricity cost of the coldest period reduces network load simultaneously.
(2) regulon of these operating scheme needs is few, mainly concentrates in core algorithm and the data acquisition, helps the technological transformation for present air-conditioning system.
(3) operational management pattern is simple, and the control precision is high, and easiness in handling.
(4) because assisting of energy storage equipment makes the geothermal heat pump air-conditioning system operating load steady, eliminate the overload operation of bringing because of climate change, improved efficiency of energy utilization.
Description of drawings
Fig. 1 is a system unit theory of constitution structure diagram of the present invention.
Fig. 2 is an accumulation of energy box structure sketch.
Fig. 3 is a control scheme logic operation key diagram.
The specific embodiment
Below in conjunction with accompanying drawing and by embodiment the present invention is made further description.Need to prove that present embodiment is narrative, is not determinate, does not limit protection scope of the present invention with this embodiment.
Based on variable load accumulated geothermal heat pump air-conditioning system device, as shown in Figure 1: accumulation of energy case 4 outlet lines are connected in series the first temperature sensor 8-1, magnetic valve 7, variable frequency pump 1, the first electromagnetic flowmeter 3-1 and the second temperature sensor 8-2 successively; Accumulation of energy case 4 inlet line are connected in series magnetic valve 7, three-temperature sensor 8-3, the second electromagnetic flowmeter 3-2 and water collector 11 successively.Between accumulation of energy case 4 import and export pipelines and be connected with 2 groups of water source heat pump units 2, ground heat exchanger 5 supplies return pipings to be connected in series with evaporimeter (winter) or condenser (summer) in variable frequency pump 1 and the water source heat pump units 2.Between accumulation of energy case 4 outlet lines and the water knockout drum 10 and connect 3 groups of variable frequency pumps 1; Pressure difference transmitter 9 be connected in N group fan coil 6 into and out of end; Be connected through magnetic valve between water knockout drum 10 and the water collector 11; Water knockout drum 10 outlets are connected with fan coil 6 imports; Water collector 11 imports are connected with fan coil 6 outlets.The signal wire harness of Programmable Logic Controller 12 is connected to variable frequency pump 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 respectively.
Method based on variable load accumulated geothermal heat pump air-conditioning system regulation and control operation may further comprise the steps process:
(1) system's accumulation of energy start-stop time is confirmed
During system stable operation, the data acquisition equipment in the Programmable Logic Controller with the same day and preceding two days terminal all air-conditioned room N group fan coils always supply circling water flow rate, temperature and each space air mean temperature, humidity data to gather storage; To next day air-conditioned room carry out simulation and forecast by time load q (τ); Calculate the high crest segment demand of building load next day Q.By saving the operating cost function F Max = ∫ 0 t P 2 ( τ ) · ( COP 2 ( τ ) COP 1 ( τ ) · f 1 - f 2 ) Dτ Calculate, obtain maximum, confirm accumulation of energy required time section duration t.
F wherein 1Electricity price during for the 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 concluding time of electricity price during for local low ebb.Work as m 2-m 1During>=t, it is m that system's accumulation of energy starts constantly 2-t stops to be constantly m 2Work as m 2-m 1During<t, it is m that accumulation of energy starts constantly 1, stop to be constantly m 2
(2) the energy storage equipment peak regulation exoergic start-stop time is confirmed
Gather the total freezing water supply of fan coil, freezing return water temperature, flow when pursuing, confirm to build required load q ' (τ) this moment by the data acquisition equipment in the Programmable Logic Controller.If the water source heat pump units rated load is q 0, when satisfy condition q ' (τ)>=nq 0, freezing return water temperature surpasses 12 ℃, when environment temperature surpasses T, the energy storage equipment exoergic starts, and bears jointly with water source heat pump units and builds required load this moment.Accumulation of energy case inlet water temperature is T 1, the outlet water temperature is T 2, work as T 2>=T 1Or the total return water temperature of chilled water stops exoergic when surpassing 12 ℃, born by the water source heat pump units independent operating.N is a proportionality constant, decides according to the applicable cases of source pump, and reference value 85%~95%, establishing the building load peak factor is 1, T surpasses 0.9 o'clock environment temperature for the building load coefficient.
(3) transition season holds the exoergic regulation and control
Electricity price period when transition season is built peak load as if the entering peak, close water source heat pump units, start the energy storage equipment independent operating.Up to accumulation of energy case outlet temperature T 2Be higher than 12 ℃, winter summer when being lower than 35 ℃, stop the energy storage equipment operation, open the 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 the accumulation of energy case is designed to hierarchy shown in Figure 2, four baffle plates is set in the case chilled water is flowed along assigned direction strengthen hot and cold water and holding the layered effect of letting slip in the journey; The vertical range of first baffle plate of X indication device tip to face distance among Fig. 2; Vertical range, the Z of the 3rd baffle plate of Y indication device tip to face distance representes to constitute the vertical height that vertical range, M between first baffle plate and second baffle plate of slit represent baffle plate, and four baffle plate physical dimensions are the same.The TT&C system flow process of Programmable Logic Controller is as shown in Figure 3, and concrete data are shown by the band touching display screen in real time.
The 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 on type of system configuration fan coil FP-34 (N=6), the specified refrigerating capacity 1800w of separate unit.According to the conventional air-conditioning pattern, 3 months summer air-conditioning time, 4 months heat supply in winter time, system's average operating time every day 10 hours, about 1728 degree of power consumption in summer, about 1920 degree of power consumption in winter.Electricity price is 1.213 a yuan/degree during according to commercial electricity consumption peak, Tianjin; Electricity price is 0.393 a yuan/degree during paddy.For source heat pump air-conditioning system routinely, running time, section was in the section in rush hour, about 4425 yuan of annual operating cost.And utilize system of the present invention, after variable load accumulated operation control, hold the exoergic time ratio: be 6/5 winter; Be 4/3 summer, about 3897.2 yuan of whole year operation expense.Practice thrift operating cost: 527.8 yuan/year, can realize practicing thrift the air-conditioning system operating cost about 12%.

Claims (2)

1. based on variable load accumulated geothermal heat pump air-conditioning system device; 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 first temperature sensor (8-1), magnetic valve (7), variable frequency pump (1), first electromagnetic flowmeter (3-1) and second temperature sensor (8-2) successively; Accumulation of energy case (4) inlet line is connected in series magnetic valve (7), three-temperature sensor (8-3), second electromagnetic flowmeter (3-2) and water collector (11) successively; Between accumulation of energy case (4) import and export pipeline and be connected with 2 groups of water source heat pump units (2); Ground heat exchanger (5) supplies return piping to be connected in series with evaporimeter (winter) or condenser (summer) in variable frequency pump (1) and the water source heat pump units (2); Between accumulation of energy case (4) outlet line and the water knockout drum (10) and connect 3 groups of variable frequency pumps (1); Pressure difference transmitter (9) be connected in N group fan coil (6) into and out of end; Be connected through magnetic valve between water knockout drum (10) and the water collector (11); Water knockout drum (10) outlet is connected with fan coil (6) import, and water collector (11) import exports with fan coil (6) and is connected, and the signal wire harness of Programmable Logic Controller (12) is connected to variable frequency pump (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) respectively.
2. based on variable load accumulated geothermal heat pump air-conditioning system regulation and control operation method, it is characterized in that the system regulation operation comprises the steps and process:
(1) system's accumulation of energy start-stop time is confirmed
During system stable operation, the data acquisition equipment in the Programmable Logic Controller with the same day and preceding two days terminal all air-conditioned room N group fan coils always supply circling water flow rate, temperature and each space air mean temperature, humidity data to gather storage;
To next day air-conditioned room carry out simulation and forecast by time load q (τ);
Calculate the high crest segment demand of building load next day Q,
By saving the operating cost function F Max = ∫ 0 t P 2 ( τ ) · ( COP 2 ( τ ) COP 1 ( τ ) · f 1 - f 2 ) Dτ Calculate, obtain maximum, confirm accumulation of energy required time section duration t,
F wherein 1Electricity price during for the 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 concluding time of electricity price is worked as m during for local low ebb 2-m 1During>=t, it is m that system's accumulation of energy starts constantly 2-t stops to be constantly m 2, work as m 2-m 1During<t, it is m that accumulation of energy starts constantly 1, stop to be constantly m 2
(2) the energy storage equipment peak regulation exoergic start-stop time is confirmed
Gather the total freezing water supply of fan coil, freezing return water temperature, flow when pursuing by the data acquisition equipment in the Programmable Logic Controller;
Build required load q ' definite this moment (τ); The water source heat pump units rated load is q 0,
When satisfy condition q ' (τ)>=nq 0, freezing return water temperature surpasses 12 ℃, when environment temperature surpasses T, the energy storage equipment exoergic starts, and bears jointly with water source heat pump units and builds required load this moment; N is a proportionality constant, reference value 85%~95%; T surpasses 0.9 o'clock environment temperature for the building load coefficient,
Accumulation of energy case inlet water temperature is T 1, the outlet water temperature is T 2, work as T 2>=T 1Or the total return water temperature of chilled water stops exoergic when surpassing 12 ℃, born by the water source heat pump units independent operating;
(3) transition season holds the exoergic regulation and control
Electricity price period when transition season is built peak load as if the entering peak, close water source heat pump units, start the energy storage equipment independent operating, up to accumulation of energy case outlet temperature T 2Be higher than 12 ℃, winter summer when being lower than 35 ℃, stop the energy storage equipment operation, open the water source heat pump units independent operating.
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CN111550861A (en) * 2020-05-19 2020-08-18 山东建筑大学 Self-adaptive optimization control method, system and device for heat pump and electric heat storage equipment

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