CN103383121A - District air-conditioner distributed secondary pump system - Google Patents
District air-conditioner distributed secondary pump system Download PDFInfo
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Abstract
The invention aims to provide a district air-conditioner distributed secondary pump system, which comprises refrigeration main engines 1, chilled water primary pumps 2, a water segregator 3, a water collector 4, and a profit and loss tube 5. According to the invention, in the two forms of an indirect connection 1 and an indirect connection 2, a chilled water secondary pumps 6, plate heat exchangers 7, user chilled water circulating pumps 8, and user tail end air processing devices 9 are mainly arranged on a user side; in the direct connection form, the chilled water secondary pumps 6, the user tail end air processing devices 9, and a bypass pipe 10 of a secondary pump suction inlet with a control valve are mainly arranged in the user side. The invention also provides a connecting form of distributively arranging the secondary pumps to a chilled water distribution system of each user building, and a corresponding operation control method. The system can well realize the hydraulic equilibrium of each paralleled loop circuit of a district cooling system transmission and distribution network, improves the operation efficiency of the secondary pumps, and greatly reduces the water pump energy consumption, thereby improving the energy efficiency ratio of the overall system, and increasing the safety of the overall district cooling system.
Description
Technical field
The present invention relates to a kind of district cooling air-conditioning system, specifically refer to a kind of district cooling air-conditioning system that in each user's building, energy saving of system and security is greatly improved frequency conversion secondary pump scattering device.
Background technology
Current, China is in a large amount of consumption of natural resource raw material to support the industrialization period of fast increasing economy, and the imbalance between supply and demand of the energy is becoming increasingly acute.Point out in the report of " research of China's energy comprehensive development Strategies and Polices " that Development Research Center of the State Council completes, the present energy efficiency of China is only 33.4%, lower than 10 percentage points of world levels, all exceed world level many on Energy consumption intensity or energy consumption of unit product.Science and technology department of building section of country studies show that, the Chinese architecture total energy consumption just is being ascendant trend year by year, in recent years in energy aggregate consumption shared ratio near 30%, along with the quickening of urbanization process and the improvement of people's living standard, China's architectural energy consumption proportion finally also will rise to 35% left and right.And in building energy consumption, air conditioning energy consumption accounts for 65%, the energy-conservation key of being not only building energy conservation of heating ventilation air-conditioning system, and also significant for saving utilization and the economic development of the energy, be the major issue that relation national economy.
Regional cold supply system refers in order to satisfy the refrigeration duty demand of a plurality of buildings in a certain specific region, makes chilled water by special air conditioner energy source station centralized system, then carries by transmission and distribution network each building in the zone, thereby the system of cooling service is provided.In each building, cold source of air conditioning needn't be set separately like this, thereby avoid arranging cooling tower everywhere.Because peak value can not appear in the air conditioner load of each building simultaneously, so the installed capacity meeting of refrigeration machine total installed capacity during less than the cold machine of scattering device, thereby might reduce the initial cost of cold machine equipment.
In regional cold supply system, special air conditioner refrigerating station is called the Regional Energy station, the Regional Energy station is called the chilled water secondary pipe network to the chilled water transmission and distribution network between subscriber unit, for the chilled water pump of refrigeration host computer service is called pump of chilled water, chilled water is called the chilled water secondary pump by the Regional Energy station by the chilled water pump that secondary pipe network is delivered to each subscriber unit in the Regional Energy station.The general constant flow operation of a water supply pump of air-conditioner water system low-temperature receiver side guarantees that the handpiece Water Chilling Units evaporator flow is constant, also can adopt the variable-flow operational mode according to the operation characteristic of main frame; And at the secondary chilled water pump that load side arranges, satisfy respectively the different demands of each cooling loop.Because in the secondary pump system, the secondary pump of load side can arrange respectively according to each cooling loop needs, and can converting operation, so be suitable for that system is large, resistance is higher and occasion that each loop part throttle characteristics or resistance differ greatly, and energy-saving effect is remarkable.
Regional cold supply system is accompanied by in the sixties in last century that international energy is in short supply, scientific and technological progress and Development of Urbanization, transformation and produce, and has energy-saving and environmental protection and economic dispatch characteristics.Simultaneously, the regional cold supply system Main Problems is that the pipe network investment is many, and fed distance is long, pump energy consumption is high, the pipe network refrigerating loss is larger.Therefore determining of system schema, be mainly around resolving these problems.
The regional air conditioner system is in order to satisfy the demand of part building, the cooling main frame was with operation continuously in 24 hours, system is longer the running time under the underload rate, and systematic energy efficiency ratio is caused very large impact, and affects thermal loss and the meaningless power consumption of water pump of the main pipe network of Energy Efficiency Ratio.In the design of pipe networks of regional cold supply system, the flow that waterpower is calculated is relevant to user type and the operating characteristic on pipeline section.When carrying out the selection of a pump discharge, need all ends be multiply by coefficient of utilization simultaneously to the aggregate demand of chilled water.In design, the resistance of each water loops differs larger sometimes, select the conventional method of pump head to be, resistance by index circuit is determined pump head, although the flow on this loop may be only the very little part of system's total flow, also have to select large lifting pump, and other loops just have to rely on the resistance elements such as balanced valve or control valve to come balance, thereby cause the energy consumption of water system higher.On the other hand, adopt in the regional cold supply system of routine and concentrate secondary pump, when the rate of load condensate of system changes, tend to cause the variation of transmission and distribution network drag characteristic, just need to carry out more complicated adjusting to secondary pump this moment and control so that it keeps high-efficiency operation.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned existing routine techniques, a kind of energy-efficient dispersion secondary pump system for district cooling is provided, this system builds the scattering device secondary pump each user, can save the pipe network investment, reduce energy source station apparatus arrangement contradiction, improve the operational efficiency of secondary pump, reduce to greatest extent the energy consumption of induction system in air-conditioning system, thereby improve the Energy Efficiency Ratio of whole system, strengthened simultaneously the security of whole regional cold supply system; The cooling entrance of each user's branch road arranges dynamic balance adjusting valve, preferably the hydraulic equilibrium of each local loop in parallel under dynamic condition in feasible region cold supply system transmission and distribution network.
Another object of the present invention is to provide above-mentioned with type of attachment and the progress control method of secondary pump scattering device in the chilled water distributing system of each user's building.
Purpose of the present invention is achieved through the following technical solutions: a kind of high-efficiency energy-saving air conditioning system for district cooling comprises refrigeration host computer 1, pump 2 of chilled water, chilled water secondary pump 6, user's end airhandling equipment 9, user's chilled water circulating pump 8 etc.; If secondary pump cooling loop adopts the indirect joint form, also comprise heat exchanger 7 in system.In secondary pump cooling loop and user's side indirect joint form, described refrigeration host computer 1, pump 2 of chilled water, scattering device in each subscriber unit prop up the secondary pump 6 in net, the cold side of heat exchanger 7 is tightly connected successively by chilled water pipe, consist of in the district cooling station to reach cold supply station to the chilled water loop of subscriber unit; Described user's end airhandling equipment 9, the hot side of heat exchanger 7, user's chilled water circulating pump 8 also seal connection successively by chilled water pipe, consist of the chilled water loop of subscriber unit inside.In secondary pump cooling loop and the direct type of attachment of user's side, described refrigeration host computer 1, pump 2 of chilled water, be scattered in secondary pump 6, the user's end airhandling equipment 9 that each subscriber unit props up in net and be tightly connected successively by chilled water pipe, consist of in the district cooling station and reach cold supply station to the chilled water loop of subscriber unit air conditioning terminal.The secondary pump 6 corresponding with each subscriber unit is connected on the chilled water main of drawing from the district cooling station by chilled water pipe, and each is organized secondary pump and is in state in parallel.
Adopt the secondary pump with the corresponding scattering device of each subscriber unit, the balance of raising chilled water transmission ﹠ distribution loop.Be exactly that a pump being located at the center station overcomes pipe resistance between water collecting and diversifying device and the equipment resistance in machine room specifically; Be located at each user's Building Heat and exchange the frequency conversion secondary pump in room according to the actual load needs regulating water flow of each user's building, and overcome pipe network circulatory system resistance between affiliated building and center station.
Chilled water secondary pump feed pipe is divided into the type of attachment of user entry and directly is connected and two kinds of forms of indirect joint.
Directly type of attachment refers to the chilled water in the pipes system main pipe is directly sent into user's end-equipment 9 through chilled water secondary pump 6, gets back in pipes system after heat exchange.Directly the type of attachment system architecture is simple, and the chilled water quality of user's air conditioning terminal is high, but the chilled water percentage of water loss is large, regulates difficulty, is fit to building below 50 meters and uses.
The indirect joint form refers to that chilled water secondary pump cooling loop carries out heat exchange by the cooling loop of heat exchanger 7 and user's side, user's side ring is provided with user's chilled water circulating pump 8 in the road, overcomes on-way resistance, local resistance and equipment resistance etc. in user's side cooling loop.Outer net heating power operating mode and the hydraulic regime of indirect joint form are simple, are easy to control, and the outer net percentage of water loss is little, and user's cold supply system and outer net waterpower are isolated, and both are independent of each other by pressure; But indirect joint mode cost is high, needs to increase the cost of equipment in heat exchange station, needs the operational management personnel and consumes electric energy.
A kind of with the chilled water distributing system of secondary pump scattering device in each user's building, type of attachment, user's watering supply characteristic of comprehensive its secondary pump cooling loop and user entry, can be divided into following several system form: the mixed direct connected system of water, the direct connected system of bypass chilled water water supply, the water indirect connecting system is mixed in the nonshared port, nonshared port bypass chilled water water supply indirect connecting system, multi-user's entrance mixes the water indirect connecting system, multi-user's entrance bypass chilled water water supply indirect connecting system.
A kind of with the chilled water distributing system of secondary pump scattering device in each user's building, its low-temperature receiver side refrigeration host computer and pump operation control method comprise the steps: that the low-temperature receiver part produces chilled water by the refrigeration host computer 1 that is connected in parallel, by pump 2 and secondary pump 6, chilled water is delivered to from energy source station and is arranged on the user entry of each user in building, indirect chilled water backwater by 7 pairs of user's building interiors of heat exchanger carries out cooling, or directly carries chilled water to user's air conditioning terminal; Main frame 1 and a pump 2 are generally and decide water yield operation in the district cooling station, and Load Regulation is moved number of units and the change of the unit self-regulation system realization of exerting oneself by centralized control system by changes, also can adopt as required the variable water volume operational mode; Establish Temperature Detector on the confession of refrigeration host computer 1, return pipe, and establish flow detector on confession, return pipe, temperature, flow signal are delivered to the heat Calculation device, calorie value and the setting value of trying to achieve compared, to start or to close handpiece Water Chilling Units and a pump; Establish the profit and loss pipe between water knockout drum in the station of center and water collector, user's side load change cause the secondary pump loop in chilled water output when changing, regulate the flow equilibrium in blowback road and secondary pump loop.
a kind of with the chilled water distributing system of secondary pump scattering device in each user's building, its secondary pump progress control method comprises the steps: in each frequency conversion secondary pump loop, (show as user's side return water temperature according to the variation of user's side cooling demand, chilled-water flow, supply backwater pressure reduction etc.), change secondary pump operation number of units, regulate the secondary pump rotating speed, during the flow that provides under minimum speed lower than secondary pump when required chilled-water flow to the user entry supply, supply water by the bypass chilled water and reduce output, perhaps by mixing the high secondary water supplying pump of water extraction temperature to keep the flow under its minimum speed.
The present invention compared with prior art has following advantage and beneficial effect: chilled water secondary pump scattering device is saved the investment of pipe network in each user builds, and reduces the contradiction of apparatus arrangement in energy source station; Pipe network circulatory system resistance between building and district cooling station under the secondary pump of being located at each user's Building Heat exchange room overcomes, can realize better the hydraulic equilibrium that each cooling loop is basic like this, reduce to greatest extent the power consumption of chilled water distributing system, especially in the occasion that system is large, resistance is higher and each loop part throttle characteristics or resistance differ greatly, energy-saving effect is remarkable; The cooling entrance of each user's branch road arranges dynamic balance adjusting valve, preferably the hydraulic equilibrium of each local loop in parallel under dynamic condition in feasible region cold supply system transmission and distribution network; Each user building has independently secondary pump from district cooling station transmission ﹠ distribution chilled water, the security that greatly improves whole regional cold supply system; Each frequency conversion secondary pump is established the minimum flow operational mode, by electronic bypath valve, has guaranteed pipe network cardinal temperature and quantity of circulating water; In each user's building, can make using of each user's building can measure more accurate science due to chilled water secondary pump scattering device; Each disperses the secondary pump loop to be parallel-connected in air-conditioning supervisor net, and under being overcome by secondary pump, pipe network circulatory system resistance between building and district cooling station, improved the flexibility that in the regional cold supply system, the user expands so greatly.
Description of drawings
Fig. 1 is the schematic flow sheet of a kind of energy-efficient dispersion secondary pump system for district cooling of the present invention.
Fig. 2 is that the present invention disperses secondary pump loop and user entry indirect joint pattern one: with the mixed water indirect joint mode schematic diagram in nonshared port.
Fig. 3 is that the present invention disperses secondary pump loop and user entry indirect joint pattern two: with nonshared port bypass chilled water water supply indirect joint mode schematic diagram.
Fig. 4 is that the present invention disperses secondary pump loop and user entry indirect joint pattern three: with the mixed water indirect joint mode schematic diagram of multi-user's entrance.
Fig. 5 is that the present invention disperses secondary pump loop and user entry indirect joint pattern four: with multi-user's entrance bypass chilled water water supply indirect joint mode schematic diagram.
Fig. 6 is that the present invention disperses secondary pump loop and the direct connection mode one of user entry: with the direct connected mode schematic diagram of user entry bypass chilled water water supply.
Fig. 7 is that the present invention disperses secondary pump loop and the direct connection mode two of user entry: with the mixed direct connected mode schematic diagram of water of user entry.
Fig. 8 is that the present invention disperses secondary pump secondary system pump energy saving to calculate the embodiment schematic diagram.
The specific embodiment
With reference to the accompanying drawings, embodiments of the present invention are elaborated.
Fig. 1 is the schematic flow sheet of a kind of energy-efficient dispersion secondary pump system for district cooling of the present invention.Regional air conditioner dispersion secondary pump system roughly can be divided into district cooling station side and user's side as shown in the dotted line frame of Fig. 1, user's lateral root can be divided into indirect joint and be connected two kinds of forms of connection according to the difference of connected mode, wherein the indirect joint mode can be divided into again alone family end and multi-user's end parallel form according to the quantity of user's end, directly connects according to having or not mixed water can be divided into two kinds of forms.
As shown in Figure 1, mainly being provided with in district cooling station side: refrigeration host computer 1, pump 2 of chilled water, water knockout drum 3, water collector 4, profit and loss pipe 5; Described profit and loss pipe 5 is connected between water knockout drum 3 and water collector 4, and its design discharge generally is no more than the metered flow of maximum separate unit refrigeration host computer, and caliber is general identical for, return main's caliber with air-conditioning, and its length surpasses 2 meters, minimizing water pipe elbow place turbulent flow phenomenon.All establish balance regulating valve with each road air-conditioning return pipe that water collector 4 converges, just regulate and each piping flow measurement for system balancing.
As shown in Figure 1, in user's side, in 2 two kinds of forms of indirect joint 1 and indirect joint, mainly be provided with: chilled water secondary pump 6, heat exchanger 7, user's chilled water circulating pump 8, user's end airhandling equipment 9.In the direct type of attachment of user's side, mainly be provided with: the bypass pipe 10 of chilled water secondary pump 6, user's end airhandling equipment 9, secondary pump suction inlet band control valve.The Main Function of the bypass pipe 10 of described secondary pump suction inlet band control valve is: when chilled water secondary pump 6 moves under minimum speed, and the supply water temperature of outer net is during lower than the required supply water temperature of user, the suction inlet of chilled water secondary pump 6 take out draw part backwater and outer net supply water mixes after again to 9 water supply of user's end airhandling equipment.
Specifically, the general constant flow operation of the pump of chilled water 2 in the district cooling station guarantees that the handpiece Water Chilling Units evaporator flow is constant, and the accident of freezing occurs the device that can avoid evaporating like this, guarantees that refrigeration host computer 1 leaving water temperature is stable; Pump 2 of chilled water overcomes on-way resistance and the local resistance between water knockout drum 3 and water collector 4, and the resistance of the interior equipment of machine room; Scattering device chilled water secondary pump 6 in the cooling loop of each subscriber unit of load side, the workload demand different according to each cooling loop respectively is by the variable frequency adjustment flow; The resistance of the pipe network circulatory system between building and district cooling station under chilled water secondary pump 6 overcomes.
In described regional air conditioner disperses the secondary pump system, the control method of refrigeration host computer 1 and a pump 2 of chilled water is mainly contained flow-control method and heat control method.Flow-control method detailed process is: establish flow switch (being used for checking water (flow) direction and the start and stop of controlling refrigeration host computer, water pump) and flowmeter (flow in access tube) on profit and loss pipe 5; When customer charge reduced, the water yield of pump 2 surpluses of chilled water flow to water collector 4 from water knockout drum 3 through profit and loss pipe 5, with the suction side of returning to a pump of chilled water after the chilled water backwater of pipes system mixes; When in the profit and loss pipe by discharge be a pump capacity 110% the time, flow switch action by programme-control, is turned off a handpiece Water Chilling Units and water pump; Otherwise when customer charge increases, the water yield of a pump 2 of chilled water is when supply falls short of demand, and chilled water secondary pump 6 will make the backwater of pipes system directly flow to water knockout drum 3 by the profit and loss pipe from water collector 4, and then enters chilled water conveying system; When water yield loss appears in refrigeration host computer 1, reach pump 2 flows of separate unit chilled water 20%～30% the time, just increase and open pump 2 of a chilled water and refrigeration host computer 1.The detailed process of heat control method is: establish temperature sensor and flow sensor at the chilled water of refrigeration host computer 1 on, return pipe, temperature, flow signal are fed back to the heat Calculation device, internal processes will calculate current cooling value according to temperature, flow signal, and then compare with setting value, to start or to close refrigeration host computer 1 and pump 2 of chilled water.
Fig. 2 to Fig. 7 is respectively that the present invention disperses six kinds of secondary pump loop and user entry to be connected the control model schematic diagram.
User's lateral root can be divided into indirect joint and be connected two kinds of forms of connection according to the difference of connected mode, wherein the indirect joint mode can be divided into nonshared port and multi-user's entrance parallel form according to the quantity of user entry, and directly connected mode is according to having or not mixed water also can be divided into two kinds of forms.In user's side and loop that the chilled water secondary pump is connected, according to the difference of type of attachment and control model, set valve, sensor should be differentiated.
Equipment component in Fig. 2 to Fig. 7 is respectively by number: chilled water secondary pump 6, heat exchanger 7, butterfly valve 11, motorized adjustment butterfly valve 12, thermometer 13, Pressure gauge 14, pressure sensor 15, temperature sensor 16, Y type vapour/water filter 17, energy meter 18, dynamic balance adjusting valve 19, flow sensor 20, electronic two-way control valve 21, differential pressure pickup 22, balanced valve 23, check-valves 24; Disperse six kinds of secondary pump loop and user entry to be connected in control model, selected equipment component and the order of connection thereof and mode are as extremely shown in Figure 7 in Fig. 2 respectively.
Regional air conditioner disperses the secondary pump system can adopt constant flow water system or variable flow system, and in two kinds of systems, variable flow system has more power savings advantages and promotional value, and the corresponding chilled water secondary pump that adopts is variable frequency pump.Chilled water is carried in loop, chilled water carries the flow-control of loop mainly to realize by the rotating speed that changes secondary pump operation number of units and secondary pump, wherein in each frequency conversion secondary pump loop, (show as user's side return water temperature according to the variation of user's side cooling demand, chilled-water flow, supply backwater pressure reduction etc.), change secondary pump operation number of units, regulate the secondary pump rotating speed, secondary pump number of units control method differential pressure control method commonly used and heat control method; During the flow that provides under minimum speed lower than secondary pump when required chilled-water flow to the user entry supply, the chilled water secondary pump is established the minimum flow operational mode, supply water by electric two-way valve door bypass chilled water and reduce output, perhaps by mixing the high secondary water supplying pump of water extraction temperature to keep the flow under its minimum speed.The below illustrates respectively six kinds of control methods that connect secondary pump in control model.
Be illustrated in figure 2 as and disperse secondary pump loop and user entry indirect joint pattern one: the mixed water of chilled water secondary pump loop is connected, then carries out heat exchange with nonshared port cooling loop by heat exchanger.Pipe network circulatory system resistance between building and district cooling station under chilled water secondary pump 6 overcomes, the workload demand according to user's side provides corresponding chilled-water flow simultaneously; The flow sensor 20 of being located on user's side air conditioning water feed pipe detects the required chilled-water flow of user's air conditioner end equipment, this flow has reflected the workload demand of user's side, flow signal is fed back to chilled water secondary pump 6, control its operation number of units and rotating speed; When chilled water secondary pump 6 moves under minimum speed, and the supply water temperature of outer net is during lower than the required supply water temperature of user, take out at the suction inlet of chilled water secondary pump 6 and draw part backwater and outer net and supply water and supply water to heat exchanger 9 after mixing again, the electronic two-way control valve 21 on mixed water bypass pipe is according to the 16 adjusting apertures of temperature sensor on the air-conditioning return pipe; Dynamic balance adjusting valve 19 is controlled by the pressure signal of air-conditioning return pipe upward pressure sensor 15 feedbacks, reduces the hydraulic misadjustment that in the secondary pump loop, the local flow change causes, improves hydraulic stability.
Be illustrated in figure 3 as and disperse secondary pump loop and user entry indirect joint pattern two: chilled water secondary pump loop bypass chilled water supplies water, then carries out heat exchange with nonshared port cooling loop by heat exchanger.Pipe network circulatory system resistance between building and district cooling station under chilled water secondary pump 6 overcomes, the workload demand according to user's side provides corresponding chilled-water flow simultaneously; The flow sensor 20 of being located on user's side air conditioning water feed pipe detects the required chilled-water flow of user's air conditioner end equipment, this flow has reflected the workload demand of user's side, flow signal is fed back to chilled water secondary pump 6, control its operation number of units and rotating speed; During the flow that provides under minimum speed lower than chilled water secondary pump 6 when required chilled-water flow to the user entry supply, extrusion end at chilled water secondary pump 6 passes through bypass chilled water water supply minimizing to the output of heat exchanger, and the electronic two-way control valve 21 on the water supply bypass pipe is according to the Signal Regulation aperture of secondary pump loop for the differential pressure pickup 22 between return pipe; Dynamic balance adjusting valve 19 is controlled by the pressure signal of air-conditioning return pipe upward pressure sensor 15 feedbacks, reduces the hydraulic misadjustment that in the secondary pump loop, the local flow change causes, improves hydraulic stability.
Be illustrated in figure 4 as and disperse secondary pump loop and user entry indirect joint pattern three: the mixed water of chilled water secondary pump loop is connected, then carries out heat exchange with multi-user's entrance cooling loop by heat exchanger, and each heat exchanger cold side loop is in parallel.Be provided with temperature sensor 16 on the chilled water feed pipe of user's side, be provided with electronic two-way control valve 21 on heat exchanger cold side inlet connection, the feedback signal that receives temperature sensor 16 is controlled aperture, and adjusting enters the chilled-water flow of heat exchanger so that the cold that provides to the user to be provided; In chilled water secondary pump loop, be provided with differential pressure pickup 22 between the water side of chilled water secondary pump 6 main and chilled water backwater main, according to its confession that detects, the pressure difference signal between return pipe, control operation number of units and the rotating speed of chilled water secondary pump 6; The control strategy of other equipment components is identical with the control strategy of relevant device element in pattern one.
Be illustrated in figure 5 as and disperse secondary pump loop and user entry indirect joint pattern four: chilled water secondary pump loop bypass chilled water supplies water, then carries out heat exchange with multi-user's entrance cooling loop by heat exchanger, and each heat exchanger cold side loop is in parallel.Pipe network circulatory system resistance between building and district cooling station under chilled water secondary pump 6 overcomes, the workload demand according to user's side provides corresponding chilled-water flow simultaneously; The flow sensor 20 of being located on user's side air conditioning water feed pipe detects the required chilled-water flow of user's air conditioner end equipment, and flow signal is fed back to chilled water secondary pump 6, controls its operation number of units and rotating speed; During the flow that provides under minimum speed lower than chilled water secondary pump 6 when required chilled-water flow to the user entry supply, supply water by the bypass chilled water on the main of the extrusion end of chilled water secondary pump 6 and reduce output to heat exchanger, the electronic two-way control valve 21 on the water supply bypass pipe is according to the Signal Regulation aperture of secondary pump loop for the differential pressure pickup 22 between the backwater main; Dynamic balance adjusting valve 19 is controlled by the pressure signal of air-conditioning return pipe upward pressure sensor 15 feedbacks, reduces the hydraulic misadjustment that in the secondary pump loop, the local flow change causes, improves hydraulic stability; The control strategy of other equipment components is identical with the control strategy of relevant device element in pattern two.
Be illustrated in figure 6 as and disperse secondary pump loop and the direct connection mode one of user entry: the water supply of chilled water secondary pump loop bypass chilled water, then with the direct connected mode schematic diagram of user entry.Pipe network circulatory system resistance between building and district cooling station under chilled water secondary pump 6 overcomes, the workload demand according to user's side provides corresponding chilled-water flow simultaneously; The temperature sensor 16 of being located on secondary pump loop return pipe detects return water temperature, and controls it to secondary pump 6 feedback signals and open number of units and rotating speed; During the flow that provides under minimum speed lower than chilled water secondary pump 6 when required chilled-water flow to the user entry supply, supply water by the bypass chilled water on the main of the extrusion end of chilled water secondary pump 6 and reduce output to user's air conditioning terminal, the electronic two-way control valve 21 on the water supply bypass pipe is according to the Signal Regulation aperture of user's side for the differential pressure pickup 22 between return pipe; Dynamic balance adjusting valve 19 is controlled by the pressure signal of air-conditioning return pipe upward pressure sensor 15 feedbacks, reduces the hydraulic misadjustment that in the secondary pump loop, the local flow change causes, improves hydraulic stability.
Be illustrated in figure 7 as and disperse secondary pump loop and the direct connection mode two of user entry: the mixed water of chilled water secondary pump loop is connected, then chilled water directly is sent to user's air conditioning terminal.Pipe network circulatory system resistance between building and district cooling station under chilled water secondary pump 6 overcomes, the workload demand according to user's side provides corresponding chilled-water flow simultaneously; Be located at the secondary pump loop and detect user's side for the pressure reduction between return pipe for the differential pressure pickup 22 between return pipe, and control it to secondary pump 6 feedback signals and open number of units and rotating speed; During the flow that provides under minimum speed lower than chilled water secondary pump 6 when required chilled-water flow to the user entry supply, take out at chilled water secondary pump intake and draw part backwater and outer net and supply water to mix and improve the chilled water supply water temperature, then supply water to reduce confession cold to user's air conditioning terminal to the user; Electronic two-way control valve 21 on mixed water bypass pipe is according to the Signal Regulation aperture of the temperature sensor 16 on user's side return pipe; Dynamic balance adjusting valve 19 is controlled by the pressure signal of air-conditioning return pipe upward pressure sensor 15 feedbacks, reduces the hydraulic misadjustment that in the secondary pump loop, the local flow change causes, improves hydraulic stability.
In this dispersion secondary pump system, the energy saving of secondary pump can be analyzed by following example:
In embodiment, three users design chilled-water flow and are 500m as shown in Figure 8
3/ h, the chilled water total amount of being sent by the district cooling station is 1500m
3/ h, the lift of the user 1 secondary pump confession backwater loop A-B1-C1-D of system is 5m, and the lift of the user 2 secondary pump confession backwater loop A-B1-B2-C2-C1-D of system is 20m, and the lift of the user 3 secondary pump confession backwater loop A-B1-B2-B3-C3-C2-C1-D of system is 35m.
Pump shaft power P computing formula is: P=ρ gGH/ η/3600000 (kW); Wherein ρ is chilled water density, kg/m
3G is acceleration of gravity; G is chilled-water flow, m
3/ h; H is lift, m; η is pump efficiency; G gets 10m/s
2, pump shaft power P computing formula can be reduced to: P=0.0028GH/ η
In embodiment as shown in Figure 8, total shaft power of secondary pump is:
In embodiment as shown in Figure 8, if the dispersion secondary pump is not set, but with the secondary pump concentrated setting in the district cooling station, its flow is 1500m
3/ h, lift is 35m, calculates its total shaft power to be:
P
tot′＝0.0028G′H′/η＝0.0028×1500×35/η＝147/η
In embodiment, adopt and disperse secondary pump with respect to the concentrated setting secondary pump as shown in Figure 8, the fractional energy savings of its secondary pump is:
[0050] be that the fractional energy savings that disperses secondary pump in embodiment has as shown in Figure 8 been carried out simple estimation more than, but enough explanation dispersion secondary pump system have significant energy-saving benefit; In the engineering of reality, disperse the energy saving of secondary pump system to obtain especially sufficient embodiment.
Claims (7)
1. an energy-efficient dispersion secondary pump system that is used for district cooling, is characterized in that: comprise refrigeration host computer, pump of chilled water, chilled water secondary pump, user's end airhandling equipment, user's chilled water circulating pump etc.; If secondary pump cooling loop adopts the indirect joint form, also comprise heat exchanger in system; If a pump of district cooling center station overcome pipe resistance between water collecting and diversifying device and the equipment resistance in machine room.
2. energy-efficient dispersion secondary pump system for district cooling described according to right 1, it is characterized in that: frequency conversion secondary pump scattering device is in the heat exchange room of each user's building; Each frequency conversion secondary pump is established the minimum flow operational mode, according to the actual load needs regulating water flow of each user's building, by electronic bypath valve, guarantees pipe network cardinal temperature and quantity of circulating water; Pipe network circulatory system resistance between user building and central hot pumping plant room under the frequency conversion secondary pump overcomes.
3. energy-efficient dispersion secondary pump system for district cooling described according to right 1, it is characterized in that: the cooling entrance of each user's branch road arranges the dynamic pressure balance regulating valve; The dynamic pressure balance regulating valve is arranged at air-conditioning feed pipe up-conversion secondary pump intake, pressure signal by air-conditioning return pipe upward pressure sensor feedback is controlled, reduce the hydraulic misadjustment that in the secondary pump loop, the local flow change causes, preferably the hydraulic equilibrium of each local loop in parallel under dynamic condition in feasible region cold supply system transmission and distribution network
4. energy-efficient dispersion secondary pump system for district cooling described according to right 1, it is characterized in that: chilled water secondary pump feed pipe is divided into the type of attachment of user entry and directly is connected and two kinds of forms of indirect joint; In secondary pump cooling loop and user's side indirect joint form, described refrigeration host computer, pump of chilled water, be scattered in secondary pump, the heat exchanger cold side that each subscriber unit props up in net and be tightly connected successively by chilled water pipe, reach cold supply station to the chilled water loop of subscriber unit in formation district cooling station, described user's end airhandling equipment, exchanger heat side, user's chilled water circulating pump also seal connection successively by chilled water pipe, consist of the chilled water loop of subscriber unit inside; In secondary pump cooling loop and the direct type of attachment of user's side, described refrigeration host computer, pump of chilled water, be scattered in secondary pump, the user's end airhandling equipment that each subscriber unit props up in net and be tightly connected successively by chilled water pipe, consist of in the district cooling station and reach cold supply station to the chilled water loop of subscriber unit air conditioning terminal;
5. energy-efficient dispersion secondary pump system for district cooling described according to right 1, it is characterized in that: the frequency conversion secondary pump corresponding with each subscriber unit of being located at each user's Building Heat exchange room is connected on the chilled water main of drawing from the district cooling station by chilled water pipe, and each is organized secondary pump and is in state in parallel.
6. energy-efficient dispersion secondary pump system for district cooling described according to right 1, it is characterized in that: in the frequency conversion secondary pump loop of each scattering device, (show as user's side return water temperature according to the variation of user's side cooling demand, chilled-water flow, supply backwater pressure reduction etc.), change secondary pump operation number of units, regulate the secondary pump rotating speed, during the flow that provides under minimum speed lower than secondary pump when required chilled-water flow to the user entry supply, supply water by the bypass chilled water and reduce output, perhaps by mixing the high secondary water supplying pump of water extraction temperature to keep the flow under its minimum speed.
7. energy-efficient dispersion secondary pump system for district cooling described according to right 1, it is characterized in that: according to the type of attachment, the user's watering supply characteristic that disperse secondary pump cooling loop and user entry, can be divided into following several system form: the mixed direct connected system of water, the direct connected system of bypass chilled water water supply, the water indirect connecting system is mixed in the nonshared port, nonshared port bypass chilled water water supply indirect connecting system, multi-user's entrance mixes the water indirect connecting system, multi-user's entrance bypass chilled water water supply indirect connecting system.
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