CN105240958A - Dual-cold-source three-pipe-system air conditioner system - Google Patents
Dual-cold-source three-pipe-system air conditioner system Download PDFInfo
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- CN105240958A CN105240958A CN201510741042.5A CN201510741042A CN105240958A CN 105240958 A CN105240958 A CN 105240958A CN 201510741042 A CN201510741042 A CN 201510741042A CN 105240958 A CN105240958 A CN 105240958A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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Abstract
The invention discloses a dual-cold-source three-pipe-system air conditioner system. The dual-cold-source three-pipe-system air conditioner system comprises an air conditioner terminal and a cold source system, wherein the cold source system comprises a high-temperature cold source and a low-temperature cold source; the outlet of the high-temperature cold source and the outlet of the low-temperature cold source are separately connected with a water supply pipe with a low-temperature water segregator, and the outlet of the water supply pipe is connected with the cold source inlet of the air conditioner terminal; the cold source outlet of a fan coil in the air conditioner terminal is connected with the inlet of the low-temperature cold source through a low-temperature water return pipe; a branch with a valve is arranged between the low-temperature water return pipe and the high-temperature water return pipe; the other cold source outlets of the air conditioner terminal are connected with the inlet of the high-temperature cold source through the high-temperature water return pipe; and the outlet of the high-temperature cold-source is also connected with the inlet of the low-temperature cold source. By adopting the dual-cold-source three-pipe-system air conditioner system, under the precondition that the total volume of the whole air conditioner water chilling unit is unchanged, the ratio of load borne by a high-temperature unit is improved to the greatest extent through reasonably allocating the ratios of the air conditioner load borne by the high-temperature unit and a low-temperature unit, so that the energy consumption of the cooling load of the whole air conditioner system is greatly lowered, and the air conditioner system is an energy-saving-type air conditioner system.
Description
Technical field
The invention belongs to central central air conditioning design field, specifically a kind of two low-temperature receiver three control air-conditioning system of design.
Background technology
Central air conditioner system, according to the set-up mode of cold and hot pipeline, can be divided into two pipes system system and four-pipe system system.So-called two pipes system system refers to that Cooling and Heat Source utilizes same group to provide the system of air conditioner cold water or hot water for the return pipe coil pipe that is end equipment.So-called four-pipe system refers to Cooling and Heat Source respectively by respective for water return pipeline, for the cooling coil of end equipment and hot coil provide the system of air conditioner cold water and hot water to be called four-pipe system system respectively, has four transfer pipelines in system.
The feature of two pipes system system is: Cooling and Heat Source is used alternatingly (switching in season), simultaneously the cooling coil of terminad device and hot coil can not provide air conditioner cold water and hot water respectively, be applicable to that building functions is more single, comfortableness requires relatively low place.Invest relatively low.
If Fig. 1 is typical four-pipe system primary pump air-conditioning system, if Fig. 2 is typical four-pipe system two stage pump air-conditioning system, the feature of four-pipe system system is: Cooling and Heat Source can use simultaneously, hot and cold two groups of coil pipes can be configured in end equipment, supply air conditioner cold water and hot water to realize terminad device simultaneously, cooling and dehumidifying can be carried out to air---heat treatment again, meets the requirement of relative humidity.In addition, point in outskirt or room that cold and heat supply demand is different, by configuring the measures such as cold and hot coil pipe or single cooling coil, the hope of " taking what one needs " can be realized completely.Therefore, four-pipe system system is applicable to the occasion higher to room air parameter request, sometimes or even a kind of means of necessity.But output investment ratio is higher.
At present, no matter four-pipe system and or two pipes system air-conditioner water system, the supply water temperature that cold source of air conditioning is general is 7 DEG C, return water temperature 12 DEG C, supply backwater temperature difference 5 DEG C.(coefficient of performance of compression type chiller unit is defined as the ratio between handpiece Water Chilling Units refrigerating capacity and input power to the coefficient of performance value of cold source of air conditioning; The coefficient of performance of absorption chiller is defined as the ratio of the refrigerating capacity of acquisition and the heat of consumption.) generally only have 3.8 ~ 5.6.
Existing air-conditioning system, generally adopts the control method of humiture coupling.In summer, adopt dehumidification by condensation mode to realize cooling and the dehumidification treatments of air, remove sensible heat load and the latent heat load of building simultaneously.Generally, utilize the chilled water of 7 DEG C by dry-bulb temperature be 35.7 DEG C air (wet-bulb temperature 28.5 DEG C) process to dry-bulb temperature be 16.4 DEG C (relative humidity is 90%).7 DEG C of chilled water heat absorptions are elevated to 12 DEG C.Therefore, the evaporating temperature of cold source of air conditioning is generally designed to 4 DEG C, condensation temperature is generally 40 DEG C (considering that the supply and return water temperature of cooling water is 32/37 DEG C), according to inverse Carnot cycle, the desirable coefficient of performance of low-temperature receiver is 7.694, and changing the maximum COP value under operating mode, (coefficient of performance of compression type chiller unit is defined as the ratio between handpiece Water Chilling Units refrigerating capacity and input power to low-temperature receiver most effective at present; The coefficient of performance of absorption chiller is defined as the ratio of the refrigerating capacity of acquisition and the heat of consumption.) also can only reach 5.6, be 72.8% of ideal value.
The approach of current raising low-temperature receiver COP mainly from the compression efficiency by improving compressor, find suitable cold-producing medium, improve the aspects such as heat transfer boundary condition and improve, but along with the development of technology, the improvement of these aspects is more and more close to the bottleneck phase, simultaneously, improve the input cost that low-temperature receiver COP needs more and more higher, improve low-temperature receiver COP and seemed the end.
Find a kind of new method extremely urgent to the approach improving low-temperature receiver COP, as everyone knows, low-temperature receiver is under the constant condition of condensation temperature, and the leaving water temperature of low-temperature receiver is directly proportional to the COP value of low-temperature receiver.Therefore, under the prerequisite that air-conditioning system low-temperature receiver refrigerating capacity is constant, in order to improve the COP of low-temperature receiver and improve the leaving water temperature of low-temperature receiver.If the leaving water temperature of low-temperature receiver is once all improve, the dehumidifying effect of air-conditioning system will reduce greatly, this by sacrificing the measure that the next energy-conservation mode of comfort level is not a kind of the best.
Summary of the invention
The present invention looks for another way, from the supply water temperature of adjustment low-temperature receiver, provide a kind of comfort level neither reducing air-conditioning system, two low-temperature receivers three control air-conditioning system of air-conditioning system low-temperature receiver energy consumption can be reduced again, this system is combined by high/low temperature low-temperature receiver and runs, while reducing energy consumption, improve the refrigeration performance of air-conditioning system.
A kind of two low-temperature receiver three control air-conditioning system, comprise air conditioning terminal, and provide the cold source system of cold to air conditioning terminal, described cold source system comprises:
High temperature low-temperature receiver, supply water temperature is 10-16 DEG C, and return water temperature is 15-21 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Low temperature cold source, supply water temperature is 4-10 DEG C, and return water temperature is 9-15 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Described high temperature low-temperature receiver is connected with the feed pipe with low temperature water knockout drum respectively by the valvular branch road of band with low temperature cold source outlet, and feed pipe outlet is connected with the low-temperature receiver entrance of air conditioning terminal;
In described air conditioning terminal, the outlet of the cryometer cooler of fan coil is connected with low temperature cold source entrance by the low-temperature return water pipe be provided with low temperature water collector; The valvular branch road of band is provided with between described low-temperature return water pipe and high-temperature tempering pipe; The pyrometric scale cooler outlet of all the other air conditioning terminals is connected with the entrance of high temperature low-temperature receiver by the high-temperature tempering pipe with high temperature water collector;
Described high temperature low-temperature receiver outlet is connected with low temperature cold source entrance by the valvular branch road of band simultaneously.
In the present invention, so-called " two low-temperature receiver ", refers to have in an air-conditioning system low-temperature receiver of two kinds of different evaporating temperatures.In two low-temperature receiver four-pipe system air-conditioning system, the relatively low low-temperature receiver of leaving water temperature is referred to as " low temperature cold source ", general 4 ~ 0 DEG C, its COP value generally only has 3.8 ~ 5.6, the low-temperature receiver that leaving water temperature is relatively high is referred to as " high temperature low-temperature receiver ", be generally 10 ~ 21 DEG C, its COP value can up to more than 8 ~ 9.In two low-temperature receiver four-pipe system air-conditioning system, high temperature low-temperature receiver and low temperature cold source shared air-conditioning system refrigeration duty, reduce energy consumption.
During actual motion, preferential unlatching high temperature low-temperature receiver, now, only provides cold to air conditioning terminal separately by high temperature low-temperature receiver; When high temperature low-temperature receiver cannot meet end cold needs, now need to open high temperature low-temperature receiver and low temperature cold source simultaneously, branch road between high temperature low-temperature receiver outlet simultaneously and feed pipe is closed, chilled water through high temperature low-temperature receiver enters into low temperature cold source, and then cooled chilled water enters into indoor cooling again.The present invention adopts the collaborative work of high/low temperature low-temperature receiver, further increases heat pump performance, reduces energy consumption.
As preferably, the supply backwater temperature difference of described high temperature low-temperature receiver is 5-8 DEG C; The supply backwater temperature difference of described low temperature cold source is 5-8 DEG C.The supply backwater temperature difference of described low temperature cold source is 5-8 DEG C; Further be preferably: the supply backwater temperature difference of described high temperature low-temperature receiver is 5-6 DEG C; The supply backwater temperature difference of described low temperature cold source is 5-6 DEG C.Adopt this technical scheme, be conducive to the cool-down dehumidification ability ensureing air-conditioning system.
As preferably, described low temperature cold source and high temperature low-temperature receiver are arranged in parallel, and are cooled by same or different cooling towers.Low temperature cold source and high temperature low-temperature receiver all can adopt the low-temperature receiver unit of multiple stage parallel connection.Each low-temperature receiver unit is all configured with independent by-pass valve control, can open and close separately.
As preferably, described high temperature low-temperature receiver supply water temperature is 13 ± 3 DEG C, and return water temperature is 18 ± 3 DEG C; Described low temperature cold source supply water temperature is 7 ± 3 DEG C, and return water temperature is 12 ± 3 DEG C.As preferred further, described high temperature low-temperature receiver supply water temperature is 13 ± 1 DEG C, and return water temperature is 18 ± 1 DEG C; Described low temperature supplying coolant-temperature gage is 7 ± 1 DEG C, and return water temperature is 12 ± 1 DEG C.
In the present invention, air conditioning terminal generally comprise in fan coil, Fresh air handling units, air-conditioner set etc. one or more.
As preferably, described air conditioning terminal comprises fan coil, is provided with low-temperature return water pipe between the cryometer cooler outlet of fan coil and low temperature cold source entrance; The valvular branch road of band is provided with between described low-temperature return water pipe and high-temperature tempering pipe.When only high temperature low-temperature receiver runs, the branch road conducting now between low-temperature return water pipe and high-temperature tempering pipe, the backwater merging that fan coil low-temperature receiver exports out enters into high temperature low-temperature receiver and cools; When high temperature low-temperature receiver and low temperature cold source run simultaneously, the cryometer cooler outlet of fan coil is directly got back in low temperature cold source by low-temperature return water pipe and is cooled.
As preferably, between described low temperature water knockout drum and high temperature water collector or low temperature water collector, be provided with the first bypass pipe with flow sensor and the first valve sets; Described first valve sets is controlled by described high temperature low-temperature receiver or low temperature cold source:
During described high temperature low-temperature receiver isolated operation, described first bypass pipe is by low temperature water knockout drum and the independent conducting of high temperature water collector (in the first valve sets, specific valve is triggered by the run signal of high temperature low-temperature receiver), and in described high temperature low-temperature receiver, unit opens controlled amounts in the flow feedback signal of described flow sensor; Such as, when the flow signal that described flow sensor detects is greater than the flow of single unit in high temperature low-temperature receiver, close a certain unit in high temperature low-temperature receiver;
When described high temperature low-temperature receiver and low temperature cold source run simultaneously, described first bypass pipe is (relative with above-mentioned " specific valve " with the independent conducting of low temperature water collector by low temperature water knockout drum, in first valve sets, all the other specific valves are triggered by the run signal of high temperature low-temperature receiver), in described low temperature cold source, unit opens controlled amounts in the flow feedback signal of described flow sensor.Such as, when the flow signal that described flow sensor detects is greater than the flow of single unit in low temperature cold source, close a certain unit in low temperature cold source.
As further preferably, described first bypass pipe is provided with differential-pressure bypass valve simultaneously, when pressure reduction meets the demands, differential-pressure bypass valve is opened, the first bypass pipe conducting.
In this technical scheme, the first described bypass pipe can be two independent pipelines, be separately positioned between low temperature water knockout drum and low temperature water collector, and between low temperature water knockout drum and high temperature water collector, now flow sensor and differential-pressure bypass valve are also two groups, two bypass pipes are respectively provided with by-pass valve control, by the first bypass pipe that conducting that the run signal of low-temperature receiver is real-time is corresponding; Certainly, the first described bypass pipe also can be main split's structure, namely be responsible for entrance to be connected with low temperature water knockout drum, supervisor is arranged described flow sensor and differential-pressure bypass valve, now flow sensor and differential-pressure bypass valve arrange one group, and arm is provided with valve sets, connect high temperature water collector respectively by arm to be connected with low temperature water collector, valve sets can be the by-pass valve control be separately positioned in respective line, and by the run signal of high/low temperature low-temperature receiver, real-time opens corresponding by-pass valve control.
For the operating mode that only high temperature low-temperature receiver runs, when under equilibrium of supply and demand state, in the bypass pipe between high temperature water knockout drum and high temperature water collector, flow is zero, when air conditioning terminal load change or control hysteresis time, have changes in flow rate in bypass pipe.When flowing exceed the flow of the single unit in high temperature low-temperature receiver in bypass pipe, illustrating that cold supply is far beyond demand, selecting to close a certain or a few units in this situation, directly saving the energy consumption of low-temperature receiver.
When room conditioning load is reduced to a certain degree, the isolated operation of high temperature low-temperature receiver, now closes low temperature cold source, and compared with routine list low-temperature receiver two pipes system air-conditioning system, adopt the high temperature low-temperature receiver cooling that energy consumption is lower, the low-temperature receiver energy consumption of air-conditioning system reduces greatly.If high temperature low-temperature receiver adopts natural cooling source, now the low-temperature receiver energy consumption of two low-temperature receiver three control air-conditioning system is 0.Found by research, under room conditioning load is in running on the lower load throughout the year for a long time, if now adopt the independent cooling of high temperature low-temperature receiver, so, the year power consumption of air-conditioning system low-temperature receiver will reduce greatly.
The present invention can adopt primary pump drive system, also can adopt two stage pump drive system.
As preferably, the pipeline between described high-temperature tempering pipe and high temperature low-temperature receiver entrance is provided with high temperature chilled water primary pump unit; Pipeline between described low-temperature return water pipe and low temperature cold source entrance is provided with cryogenic freezing water primary pump unit.High temperature chilled water primary pump unit, cryogenic freezing water primary pump unit can be selected to determine frequency pump and also can select variable frequency pump.
When selection primary pump drive system, when primary pump adopts variable frequency pump, as preferably, described air-conditioning system also comprises the differential pressure pickup detected for pressure reduction between return pipe;
The first bypass pipe with flow sensor, the first valve sets, electric control valve is provided with between described low temperature water knockout drum and high temperature water collector or low temperature water collector; Described first valve sets is controlled by described high temperature low-temperature receiver and low temperature cold source;
During described high temperature low-temperature receiver isolated operation, described differential pressure pickup is for detecting pressure difference signal between feed pipe and high-temperature tempering pipe, the valve opening simultaneously controlled by high temperature low-temperature receiver in the first valve sets, described high temperature chilled water primary pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described high temperature chilled water primary pump unit list pump operation and this single pump works under low-limit frequency time open; Now the first bypass pipe is by feed pipe and the conducting of high-temperature tempering pipe, and high temperature chilled water primary pump changes into from converting operation determines frequency operation;
When described high temperature low-temperature receiver and low temperature cold source run simultaneously, described differential pressure pickup is for detecting pressure difference signal between feed pipe and low-temperature return water pipe, the valve opening simultaneously controlled by low temperature cold source in the first valve sets, described cryogenic freezing water primary pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described cryogenic freezing water primary pump unit list pump operation and this single pump works under low-limit frequency time open, now the first bypass pipe is by feed pipe and the conducting of low-temperature return water pipe, and cryogenic freezing water primary pump changes into from converting operation determines frequency operation;
In technique scheme, described " high temperature chilled water primary pump unit is the variable frequency pump unit being controlled by described differential pressure pickup " or " described cryogenic freezing water primary pump unit is the variable frequency pump unit being controlled by described differential pressure pickup " mainly refers to: high and low temperature chilled water primary pump unit is according to pressure extent, adjust self rotating speed, thus adjust flux size; Such as, when high temperature increases for the pressure differential between, water return pipeline or low temperature supplying, water return pipeline, illustrate that end demand reduces, now need the rotating speed reducing high and low temperature chilled water primary pump unit, otherwise, improve the rotating speed of described cryogenic freezing water primary pump unit;
In Variable flow system, described electric control valve directly can be controlled by the signal of telecommunication that high temperature chilled water primary pump unit or cryogenic freezing water primary pump unit export, also can the pressure difference signal of pressure difference sensor, now needs pressure difference signal to be converted to the control signal of telecommunication.
When selecting primary pump drive system, when primary pump adopts and determines frequency pump, described high-temperature tempering pipe is provided with high temperature chilled water primary pump unit; Described low-temperature return water pipeline is provided with cryogenic freezing water primary pump unit; Described high temperature chilled water primary pump unit and cryogenic freezing water primary pump unit are fixed pump assembly frequently.Adopt one-level frequency pump assembly surely, stable chilled water can be provided to high/low temperature low-temperature receiver, ensure the optimum performance of high/low temperature low-temperature receiver.
When selecting two stage pump drive system, as preferably, described feed pipe is provided with chilled water two stage pump unit;
Also comprise the differential pressure pickup detected for pressure reduction between return pipe;
The second bypass pipe with electric control valve and the second valve sets is provided with between described feed pipe and high-temperature tempering pipe or low-temperature return water pipe; Described second valve sets is controlled by described high temperature low-temperature receiver and low temperature cold source;
During described high temperature low-temperature receiver isolated operation, described differential pressure pickup is for detecting pressure difference signal between feed pipe and high-temperature tempering pipe, the valve opening simultaneously controlled by high temperature low-temperature receiver in the second valve sets, described chilled water two stage pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described chilled water two stage pump unit list pump operation and this single pump works under low-limit frequency time open, now, chilled water two stage pump changes into from converting operation to be determined frequency and runs the second bypass pipe by feed pipe and the conducting of high-temperature tempering pipe, the refrigerant of unnecessary refrigerant directly and after heat exchange is merged, returns high temperature low-temperature receiver;
When described high temperature low-temperature receiver and low temperature cold source run simultaneously, described differential pressure pickup is for detecting pressure difference signal between feed pipe and low-temperature return water pipe, the valve opening simultaneously controlled by low temperature cold source in the second valve sets, described chilled water two stage pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described chilled water two stage pump unit list pump operation and this single pump works under low-limit frequency time open, now chilled water two stage pump from converting operation change into determine frequency run, second bypass pipe is by feed pipe and the conducting of low-temperature return water pipe, the refrigerant of unnecessary refrigerant directly and after heat exchange is merged, returns high and low temperature low-temperature receiver.
In Primary pump system, described electric control valve directly can be controlled by the signal of telecommunication of chilled water two stage pump unit, also can the pressure difference signal of pressure difference sensor, now needs pressure difference signal to be converted to the control signal of telecommunication.
As preferably, also comprise temperature sensor and humidity sensor that indoor and outdoor temperature and humidity are detected; Described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.Optionally open high temperature low-temperature receiver, low temperature cold source according to outdoor temperature and humidity, or open high and low temperature low-temperature receiver simultaneously.As further preferably, according to outdoor temperature and end load amount, the cooling ratio of high/low temperature low-temperature receiver can be adjusted by control valve or pump assembly.
As preferably, also comprise the temperature sensor detected indoor temperature and the humidity sensor detected indoor humidity, described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.Can be controlled the load proportion that high temperature low-temperature receiver and low temperature cold source are born by return air temperature and air humidity, ensure heat pump performance optimization.
In two cold source air conditioning system, the air conditioner load ratio that high temperature low-temperature receiver is born is larger, and the energy consumption of whole air-conditioning system is less, but the ratio of high temperature low-temperature receiver is higher, and the dehumidifying effect of air-conditioning system is less.But, the ratio of air conditioner load is born merely for reducing the energy consumption of whole air-conditioning system and unconfined raising high temperature low-temperature receiver, when indoor humidity load is larger, two cold source air conditioning system can not meet indoor humidity load demand, and two low-temperature receiver three control air-conditioning system bears the ratio of air-conditioning system according to the suitable adjustment high temperature low-temperature receiver of indoor humidity load and low temperature.
In two cold source air conditioning system, air conditioning terminal control system adopts feedback control system, and tail end air conditioner system is distributed high temperature low-temperature receiver and low temperature cold source and born by measuring return air temperature and humidity the ratio that air-conditioning system bears.The control principle of two low-temperature receiver three control air-conditioning system is: preferentially all open high temperature low-temperature receiver cooling.If return air temperature and humidity are lower than setting value, now reduce the semen donors of high temperature low-temperature receiver gradually, until return air humiture reaches setting value; If return air temperature and humidity are higher than setting value, now open low temperature cold source cooling gradually, until return air humiture reaches setting value.The semen donors of high temperature low-temperature receiver and low temperature cold source controls by the flow of high temperature low-temperature receiver and low temperature cold source exit refrigerant.
In the present invention, " water " (such as confession/return water temperature, high/low temperature confession/water return pipeline, the high/low temperature chilled water one/two stage pump unit etc.) occurred in the title of each parameter, element, pipeline, the refrigerant of air-conditioning system is acted on without any restriction, in air-conditioning system of the present invention, adoptable refrigerant both comprised water, also comprised the mixture of other refrigerating mediums and water or also can select other any media that can be used as refrigerating medium.
The two low-temperature receiver three control air-conditioning systems of indication of the present invention and traditional four-pipe system air-conditioning system have essential distinction.First, supply and return water temperature is different, in tradition three control air-conditioning systems, hot water supply and return water temperature supplies backwater water temperature higher than the high temperature chilled water in the present invention far away, in traditional air-conditioning system, hot water supply and return water temperature is generally 60 ~ 45 DEG C, return water temperature is 55 ~ 40 DEG C, and the supply water temperature of high temperature low-temperature receiver in the present invention is generally 13 ± 3 DEG C, return water temperature is generally 18 ± 3 DEG C.Secondly, purposes is different, in tradition four-pipe system air-conditioning system, chilled water is used for carrying out cool-down dehumidification to air, hot-water heating system is used for the reheating of air or heating, the energy consumption of this system is comparatively large, and in two cold source air conditioning system, high/low temperature chilled water is all for the dehumidifying and cooling to air, without reheat load, the energy consumption of air-conditioning system is less.Finally, two low-temperature receiver three control air-conditioning systems not only can realize the cool-down dehumidification process of Air Coupling, can realize again the cool-down dehumidification process of air decoupling zero.
Compared with former air-conditioning system, beneficial effect of the present invention is embodied in:
(1) compared with former single cold source air conditioning system, the present invention is ensureing under the precondition that whole air conditioner cold water unit total capacity is constant, the ratio of air conditioner load is born by reasonable distribution high/low temperature unit, improve the load proportion born of high temperature unit to greatest extent, greatly reducing the energy consumption of whole air-conditioning system refrigeration duty, is a kind of energy-saving air-conditioning system.
(2) because the supply backwater temperature difference of air-conditioning system improves greatly, under the condition of identical refrigerating capacity, the flow of air-conditioning system reduces greatly, and the energy consumption of induction system reduces greatly.
(3) transition season, when end humidity load declines, the adopted Efficient high-temperature low-temperature receiver cooling of whole air-conditioning system, greatly reduces air-conditioning system.
Accompanying drawing explanation
Fig. 1 is the structural representation of single low-temperature receiver four-pipe system primary pump air-conditioning system in prior art;
Fig. 2 is the structural representation of single low-temperature receiver four-pipe system two stage pump air-conditioning system in prior art;
Fig. 3 is the structural representation of the primary pump air-conditioning system of of the present invention pair of low-temperature receiver three control air-conditioning system;
Fig. 4 is the structural representation of the two stage pump air-conditioning system of of the present invention pair of low-temperature receiver three control air-conditioning system.
In above-mentioned accompanying drawing:
SP-feed pipe, , HRP-high-temperature tempering pipe, CRP-low-temperature return water pipeline, HPI-high temperature chilled water primary pump unit, CPI-cryogenic freezing water primary pump unit, CBVI-first low temperature electrically-controlled valve, HBVI-first high temperature electrically-controlled valve, F.M-flow sensor, PBV-differential-pressure bypass valve, BPI-first bypass pipe, BPII-second bypass pipe, HBVII-second high temperature electrically-controlled valve, CBVII-second low temperature electrically-controlled valve, CBVIII-the 3rd low temperature electrically-controlled valve, HBVIII-third high temperature electrically-controlled valve, CBVIV-the 4th low temperature electrically-controlled valve, HBVIV-the 4th high temperature electrically-controlled valve, ECV-electric control valve, PS-differential pressure pickup, CWPI-first cooling water pump, CWPII-second cooling water pump.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described:
In the present invention, the low-temperature receiver of indication can be that natural cooling source is if the surface water such as rivers,lakes and seas, underground water etc. are directly as high/low temperature low-temperature receiver.Two low-temperature receiver three control air-conditioner water systems in parallel are divided into low-temperature receiver three control Primary pumps air-conditioner water systems in parallel and low-temperature receiver three control secondary pump air-conditioner water systems in parallel.
Embodiment 1: two low-temperature receiver three control primary pump air-conditioner water systems in parallel
As shown in Figure 3, the cold source of air conditioning of two low-temperature receiver three control primary pump air-conditioner water systems in parallel is made up of jointly high temperature low-temperature receiver and low temperature cold source, adopts mode in parallel between high temperature low-temperature receiver and low temperature cold source; High temperature low-temperature receiver and low temperature cold source cool by cooling tower; The cooling water of cooling tower outlet provides cooling cold to high temperature low-temperature receiver and low temperature cold source respectively through the first cooling water pump CWPI, the second cooling water pump CWPII.
The supply water temperature of high temperature low-temperature receiver is 10-16 DEG C, and return water temperature is 15-21 DEG C, and supply backwater temperature difference is 5-11 DEG C; The supply water temperature of low temperature cold source is 4-10 DEG C, and return water temperature is 9-15 DEG C, and supply backwater temperature difference is 5-11 DEG C; High temperature low-temperature receiver and low temperature cold source can be made up of one or more low-temperature receiver unit as required, adopt the situation of multiple stage low-temperature receiver unit more common.
The high temperature induction system of air-conditioning system comprises feed pipe SP, be arranged on feed pipe SP with the low temperature water knockout drum (low temperature water knockout drum exports and is communicated with the low-temperature receiver entrance of each air conditioning terminal respectively) of high temperature low-temperature receiver outlet, high-temperature tempering pipe HRP, be arranged on high-temperature tempering pipe HRP with the high temperature water collector of each air conditioning terminal low-temperature receiver outlet, high temperature chilled water primary pump unit HPI with high temperature water collector outlet; Cryogenic transfer system and high temperature induction system share a feed pipe SP, cryogenic transfer system comprises feed pipe SP, be arranged on feed pipe SP with the low temperature water knockout drum (low temperature water knockout drum exports and is communicated with the low-temperature receiver entrance of each air conditioning terminal respectively) of low temperature cold source outlet, low-temperature return water pipeline CRP, be arranged on low-temperature return water pipeline CRP with the low temperature water collector of each air conditioning terminal low-temperature receiver outlet, the cryogenic freezing water primary pump unit CPI that is communicated with low temperature water collector primary outlet.
Low temperature cold source and the outlet of high temperature low-temperature receiver are all by being with valvular branch road to be connected with feed pipe SP; Such as, the outlet of low temperature cold source is by being connected with feed pipe SP with the branch road I of the first low temperature electrically-controlled valve CBVI, and the outlet of high temperature low-temperature receiver is by being connected with feed pipe SP with the branch road II of the first high temperature electrically-controlled valve HBVI;
The first bypass pipe BPI with flow sensor F.M, differential-pressure bypass valve PBV and the first valve sets is provided with between low temperature water knockout drum and high temperature water collector or low temperature water collector; First valve sets is controlled by high temperature low-temperature receiver or low temperature cold source, first valve sets comprises the second high temperature electrically-controlled valve HBVII and the second low temperature electrically-controlled valve CBVII, second high temperature electrically-controlled valve HBVII is positioned on the branch road that the first bypass pipe BPI is connected with high temperature water knockout drum, and the second low temperature electrically-controlled valve CBVII is positioned on the branch road that the first bypass pipe BPI is connected with low temperature water knockout drum:
During the isolated operation of high temperature low-temperature receiver, now the second high temperature electrically-controlled valve HBVII receives high temperature low-temperature receiver and runs triggering signal, by place branch road conducting, first bypass pipe BPI is by low temperature water knockout drum and the independent conducting of high temperature water collector, flow sensor F.M is for detecting the bypass flow between low temperature water knockout drum and high temperature water collector, and now in high temperature low-temperature receiver, unit opens controlled amounts in the flow feedback signal of flow sensor F.M; Such as, when the flow signal that flow sensor F.M detects is greater than the flow of single unit in high temperature low-temperature receiver, close a certain unit in high temperature low-temperature receiver, the closedown that the first high temperature electrically-controlled valve of its correspondence is synchronous under flow sensor F.M controls simultaneously.
When high temperature low-temperature receiver and low temperature cold source run simultaneously, second low temperature electrically-controlled valve CBVII receives the triggering signal that low temperature cold source runs, by place branch road conducting, first bypass pipe is by low temperature water knockout drum and the independent conducting of low temperature water collector, flow sensor F.M is for detecting the bypass flow between low temperature water knockout drum and low temperature water collector, and now in low temperature cold source, unit opens controlled amounts in the flow feedback signal of flow sensor F.M.Such as, when the flow signal that flow sensor F.M detects is greater than the flow of single unit in low temperature cold source, close a certain unit in low temperature cold source, the closedown that the first low temperature electrically-controlled valve of its correspondence is synchronous under flow sensor F.M controls simultaneously.
Above-mentioned high temperature chilled water primary pump unit HPI and cryogenic freezing water primary pump CPI can adopt and determine frequency pump group, also can adopt variable frequency pump group; When adopting fixed pump frequently, structure as shown in Figure 3.
When adopting variable frequency pump group, on the basis of Fig. 3, also need to increase differential pressure pickup; Now, pressure differential detection bypass is provided with between feed pipe and high-temperature tempering pipe HRP or low-temperature return water pipe CRP, pressure differential detection bypass is connected with low-temperature return water pipeline CRP with high-temperature tempering pipeline HRP by branch road simultaneously respectively, branch road is two, article one, branch road is connected with high-temperature tempering road HRP, another branch road is connected with low-temperature return water pipe CRP, and the branch road be connected with high-temperature tempering pipe HRP is provided with high temperature pressure reduction electrically-controlled valve, and the branch road be connected with low-temperature return water pipe CRP is provided with low temperature pressure reduction electrically-controlled valve;
First bypass pipe BPI is provided with electric control valve simultaneously;
During the isolated operation of high temperature low-temperature receiver, high temperature pressure reduction electrically-controlled valve corresponding with high-temperature tempering pipe in pressure differential detection bypass is opened, differential pressure pickup is for detecting pressure difference signal between feed pipe SP and high-temperature tempering pipe HRP, second high temperature electrically-controlled valve receives the triggering signal that high temperature low-temperature receiver runs simultaneously, second high temperature electrically-controlled valve is opened, first bypass pipe conducting, high temperature chilled water primary pump unit is the variable frequency pump unit being controlled by differential pressure pickup; Such as, when differential pressure pickup pressure difference signal increases, then reduce pump rotary speed, otherwise then increase pump rotary speed, when only having a variable frequency pump in work, and when this variable frequency pump has been operated in low-limit frequency, electric control valve is opened.
When high temperature low-temperature receiver and low temperature cold source run simultaneously, low temperature pressure reduction electrically-controlled valve corresponding with low-temperature return water pipe in pressure differential detection bypass is opened, first bypass pipe conducting, differential pressure pickup is for detecting pressure difference signal between feed pipe and low-temperature return water pipe, the the second low temperature electrically-controlled valve simultaneously controlled by low temperature cold source in the first valve sets is opened, and cryogenic freezing water primary pump unit is the variable frequency pump unit being controlled by differential pressure pickup; Electric control valve at cryogenic freezing water primary pump unit list pump operation and this single pump works under low-limit frequency time open.
Air conditioning terminal of the present invention, existing end system can be adopted, in this example, air conditioning terminal comprises integral type single coil fan coil, integral type single coil Fresh air handling units, integral type three coil air conditioner unit, integral type dual coil pipes air-conditioner set, wherein only has low temperature surface cooling section in integral type single coil fan coil, this low temperature surface cooling section entrance (i.e. low-temperature receiver entrance) is connected with feed pipe, this low temperature surface cooling section outlet (i.e. low-temperature receiver outlet) is connected with low-temperature return water pipe, be connected with high temperature low-temperature receiver entrance by branch road III simultaneously, branch road III is provided with the 3rd low temperature electrically-controlled valve CBVIII, when the isolated operation of high temperature low-temperature receiver, this branch road conducting, the now outlet of integral type single coil fan coil is directly connected with high temperature low-temperature receiver entrance,
Only be provided with high temperature surface cooling section in integral type single coil Fresh air handling units, high temperature surface cooling section entrance is connected with feed pipe SP; The outlet of high temperature surface cooling section is connected with high-temperature tempering pipe HRP; Integral type three coil air conditioner unit and integral type dual coil pipes air-conditioner set are equipped with low temperature surface cooling section, interlude and high temperature surface cooling section, wherein the cold entrance of cryometer is connected with feed pipe SP, outlet is connected with high temperature surface cooling section successively with interlude, and the outlet of high temperature surface cooling section is connected with high-temperature tempering pipe HRP; The concrete structure of air conditioning terminal system can see patent document (application publication number CN102620360A).
High temperature low-temperature receiver outlet simultaneously is also connected with low temperature cold source entrance by branch road IV; Branch road IV is provided with third high temperature electrically-controlled valve HBVIII, when high temperature low-temperature receiver and low temperature cold source run simultaneously, this branch road conducting, realize the series connection of high temperature low-temperature receiver and low temperature cold source, now third high temperature electrically-controlled valve HBVIII is controlled by flow sensor F.M, opens unit quantity according in the flow signal adjustment high temperature low-temperature receiver of flow sensor F.M.
During the technical scheme actual motion of the present embodiment:
Preferential unlatching high temperature low-temperature receiver, now the first high temperature electrically-controlled valve HBVI conducting, the 3rd low temperature electrically-controlled valve CBVIII conducting, the second high temperature electrically-controlled valve HBVII in the first bypass pipe BPI opens; Air conditioning terminal system refrigerant out all enters in high temperature low-temperature receiver and freezes, during the normal cooling operating mode of system, when water system end flow (or end load) constantly reduces, pressure between feed pipe SP and high-temperature tempering pipe HRP raises, and the first bypass pipe is by differential-pressure bypass valve PBV conducting when meeting differential pressure requirements; Pressure difference signal between differential pressure pickup Real-Time Monitoring feed pipe SP and high-temperature tempering pipe HRP; When the pressure difference signal of differential pressure pickup changes, high temperature chilled water primary pump unit HPI according to the frequency regulating variable frequency pump for pressure difference signal between return pipe, and then changes flow; When an only surplus variable frequency pump job in high temperature chilled water primary pump unit HPI, and variable frequency pump is converted to down in limited time, opens the electric control valve of the first bypass pipe, the first bypass pipe conducting; Differential-pressure bypass valve PBV opens under differential pressure action, starts pressure reduction bypass, and according to main frame inflow temperature and the Inlet and outlet water temperature difference, optimizes main frame operating mode, guarantee the energy-efficient operation of main frame.
When water system end flow (or end load) constantly reduces, flow between low temperature water knockout drum and high temperature water collector on the first bypass pipe BPI increases gradually, when on first bypass pipe BPI, flow sensor F.M detects that bypass flow is greater than separate unit high temperature low-temperature receiver unit flow, first flow sensor F.M gives high temperature low-temperature receiver unit a shutdown signal, close a high temperature low-temperature receiver unit, the first high temperature electrically-controlled valve HBVI that this unit is corresponding simultaneously closes.
When high temperature low-temperature receiver cannot meet air conditioning terminal needs, now the first high temperature electrically-controlled valve HBVI closes, and third high temperature electrically-controlled valve HBVIII opens, and the feedback signal of flow sensor F.M is for controlling the first low temperature electrically-controlled valve CBVI; 3rd low temperature electrically-controlled valve CBVIII closes; Second low temperature electrically-controlled valve CBVII opens, and the first bypass pipe BPI is by low temperature water knockout drum and the conducting of high temperature water collector, and flow sensor F.M is for detecting low temperature water knockout drum and high temperature water collector bypass flow; Differential pressure pickup is for detecting the pressure reduction between feed pipe SP and low-temperature return water pipe CRP; 4th low temperature electrically-controlled valve is opened, and when electric control valve triggers, the first bypass pipe is by supply channel and the conducting of low-temperature return water pipe.
Embodiment 2: two low-temperature receiver three control two stage pump air-conditioner water systems in parallel
As shown in Figure 4, different from embodiment 1, in native system, adopt Primary pump system, feed pipe SP is provided with chilled water two stage pump unit PII;
Be provided with the differential pressure pickup PS detected for pressure reduction between return pipe equally, the connected mode of differential pressure pickup PS and operation principle equivalent integers 1;
The second bypass pipe BPII with electric control valve ECV and the second valve sets is provided with between feed pipe SP and high-temperature tempering pipe HRP or low-temperature return water pipe CRP, second bypass pipe BPII is connected with low-temperature return water pipe CRP with high-temperature tempering pipe HRP respectively by branch road, the branch road be connected with high-temperature tempering pipe HRP is provided with the 4th high temperature electrically-controlled valve HBVIV, and the branch road be connected with low-temperature return water pipe CRP is provided with the 4th low temperature electrically-controlled valve CBVIV; Second valve sets is controlled by high temperature low-temperature receiver and low temperature cold source;
The set-up mode of low temperature pressure reduction electrically-controlled valve CPBV and high temperature pressure reduction electrically-controlled valve HPBV is with embodiment 1; On first bypass pipe BPI, the working method of each valve and sensor is with embodiment 1.
Second bypass pipe at the mono-pump operation of chilled water two stage pump unit PII and this single pump works under low-limit frequency time open;
The working methods such as chilled water two stage pump unit PII and control mode all can reference examples 1; High temperature chilled water primary pump unit and cryogenic freezing water primary pump unit are determines frequency pump; No longer according to adjustment such as pressure difference signals;
During the isolated operation of high temperature low-temperature receiver, high temperature pressure reduction electrically-controlled valve HPBV conducting, differential pressure pickup is for detecting pressure difference signal between feed pipe and high-temperature tempering pipe, the 4th high temperature electrically-controlled valve HBVIV simultaneously controlled by high temperature low-temperature receiver in the second valve sets opens, and chilled water two stage pump unit PII is the variable frequency pump unit being controlled by differential pressure pickup; Electric control valve at the mono-pump operation of chilled water two stage pump unit PII and this single pump works under low-limit frequency time open;
When high temperature low-temperature receiver and low temperature cold source run simultaneously, low temperature pressure reduction electrically-controlled valve CPBV opens, differential pressure pickup is for detecting pressure difference signal between feed pipe and low-temperature return water pipe, the 4th low temperature electrically-controlled valve CBVIV simultaneously controlled by low temperature cold source in the second valve sets opens, and chilled water two stage pump unit PII is the variable frequency pump unit being controlled by differential pressure pickup; Electric control valve at described chilled water two stage pump unit list pump operation and this single pump works under low-limit frequency time open.For embodiment 1 and embodiment 2, for supply water temperature be 14 DEG C, high temperature low-temperature receiver return water temperature is 19 DEG C, low temperature cold source return water temperature is 12 DEG C and describes and adopt two stage pump units and only adopt the cooling operating mode of primary pump unit as follows:
For the air-conditioning system adopting two stage pump unit, wherein the work of two stage pump unit is as follows:
High temperature low-temperature receiver produces the high temperature chilled water of 14 DEG C after the shunting of low temperature water knockout drum, the end low-temperature receiver entrance of air-conditioning system is delivered to by chilled water two stage pump unit PII, the high temperature chilled water backwater of 19 DEG C is become after high temperature water collector is collected after two low-temperature receiver special air conditioner end unit crosses heat exchange, by the unified evaporimeter delivering to high cold source of high temperature chilled water primary pump unit HPI, so circulate;
When high temperature low-temperature receiver and low temperature cold source series connection run simultaneously, the chilled water of high temperature low-temperature receiver all enters into low temperature cold source through branch road IV and low-temperature return water pipe chilled water out, low temperature cold source produces the cryogenic freezing water of 7 DEG C after the shunting of low temperature water knockout drum, the low-temperature receiver entrance of air-conditioning system is delivered to by cryogenic freezing water two stage pump unit CPII, the cryogenic freezing water backwater of 12 DEG C is become after low temperature water collector is collected after two low-temperature receiver special air conditioner end unit crosses heat exchange, by the unified evaporimeter delivering to low cold source of cryogenic freezing water primary pump unit CPI, so circulate.
For the air-conditioning system adopting primary pump unit, wherein the work of primary pump unit is as follows:
High temperature low-temperature receiver produces the high temperature chilled water of 14 DEG C after the shunting of low temperature water knockout drum, the end low-temperature receiver entrance of air-conditioning system is delivered to by high temperature chilled water primary pump unit HPI, the high temperature chilled water backwater of 19 DEG C is become after high temperature water collector is collected after two low-temperature receiver special air conditioner end unit crosses heat exchange, by the unified evaporimeter delivering to high cold source of high temperature chilled water primary pump unit HPI, so circulate;
When running when high temperature low-temperature receiver and low temperature cold source series connection simultaneously, the chilled water of high temperature low-temperature receiver all enters into low temperature cold source through branch road IV and low-temperature return water pipe chilled water out, low temperature cold source produces the cryogenic freezing water of 7 DEG C after the shunting of low temperature water knockout drum, the end low-temperature receiver entrance of air-conditioning system is delivered to by cryogenic freezing water primary pump unit CPI, the cryogenic freezing water backwater of 12 DEG C is become after low temperature water collector is collected after two low-temperature receiver special air conditioner end unit crosses heat exchange, by the unified evaporimeter delivering to low cold source of cryogenic freezing water primary pump unit CPI, circulation like this.
In technique scheme, can according to outdoor temperature, select to need to open high temperature low-temperature receiver or need to open low temperature cold source, such as, when outdoor temperature is higher than 35 DEG C, weather is comparatively hot, for obtaining good refrigeration, only can open low temperature cold source; When outdoor temperature is lower than 35 DEG C, during higher than 30 DEG C, low temperature cold source and high temperature low-temperature receiver can be opened simultaneously; When outdoor temperature is lower than 30 DEG C, only needs to open high temperature low-temperature receiver, adopt above-mentioned operational mode to reduce the energy consumption of air-conditioning system further.
Transition season high temperature unit cooling operating mode:
In conditioning transition air season, because the refrigeration duty of air-conditioning system reduces greatly, now whole air-conditioning system switch to high temperature unit cooling operating mode, the leaving water temperature of high temperature unit is identical with the leaving water temperature of high temperature unit in high/low temperature unit simultaneously cooling operating mode.
In addition, if low temperature unit breaks down, now whole air-conditioning system switch to high temperature unit cooling operating mode, all backwater enter the work of high temperature low-temperature receiver, and high temperature unit is according to the demand cooling of end unit, and now the leaving water temperature of high temperature unit is identical with low temperature unit.
With the refrigeration duty data instance of air-conditioned room in certain Practical Project, the fractional energy savings of the air-conditioning system of two low-temperature receiver three control of checking further.
Out door climatic parameter is: the outdoor dry-bulb temperature 35.6 DEG C of summer air-conditioning, the outdoor wet-bulb temperature 27.9 DEG C of summer air-conditioning.Indoor design is: Summer Indoor design temperature 26 DEG C, relative humidity 55%, dew-point air supply state point temperature 16.5 DEG C, relative humidity; COP when low temperature cold source supply and return water temperature is 7/12 DEG C gets 5.6, and high temperature low-temperature receiver supply water temperature and cooled air minimum temperature difference Δ t get 3 DEG C; Total air output of air-conditioned room is minimum supply air rate, air output when namely ventilation state point is dew-point air supply state point.Refer to table 1;
The low-temperature receiver comprehensive energy efficiency of table 1 pair low-temperature receiver three control air-conditioning system compares EER
Can be drawn by table 1: under the condition of given new wind ratio, the low-temperature receiver Energy Efficiency Ratio (the low-temperature receiver Energy Efficiency Ratio of the air-conditioning system that conventional single low-temperature receiver humiture is coupled only has 5.6) compared with the air-conditioning system low-temperature receiver Energy Efficiency Ratio of the warm and humid coupling of single low-temperature receiver of the air-conditioning system of two low-temperature receiver three control, the maximum Energy Efficiency Ratio of two low-temperature receiver three control air-conditioning system can reach 7.48, can about 30% be improved, that is to say that the energy consumption of air-conditioning system low-temperature receiver can reduce about 30%.
Claims (9)
1. a two low-temperature receiver three control air-conditioning system, comprise air conditioning terminal, and provide the cold source system of cold to air conditioning terminal, it is characterized in that, described cold source system comprises:
High temperature low-temperature receiver, supply water temperature is 10-16 DEG C, and return water temperature is 15-21 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Low temperature cold source, supply water temperature is 4-10 DEG C, and return water temperature is 9-15 DEG C, and supply backwater temperature difference is 5-11 DEG C;
Described high temperature low-temperature receiver is connected with the feed pipe with low temperature water knockout drum respectively by the valvular branch road of band with low temperature cold source outlet, and feed pipe outlet is connected with the low-temperature receiver entrance of air conditioning terminal;
In described air conditioning terminal, the cryometer cooler outlet of fan coil is connected with low temperature cold source entrance by the low-temperature return water pipe be provided with low temperature water collector; The valvular branch road of band is provided with between described low-temperature return water pipe and high-temperature tempering pipe; The pyrometric scale cooler outlet of all the other air conditioning terminals is connected with the entrance of high temperature low-temperature receiver by the high-temperature tempering pipe with high temperature water collector;
Described high temperature low-temperature receiver outlet is connected with low temperature cold source entrance by the valvular branch road of band simultaneously.
2. according to claim 1 pair of low-temperature receiver three control air-conditioning system, is characterized in that, the supply backwater temperature difference of described high temperature low-temperature receiver is 5-8 DEG C; The supply backwater temperature difference of described low temperature cold source is 5-8 DEG C.
3. according to claim 1 pair of low-temperature receiver three control air-conditioning system, is characterized in that, described high temperature low-temperature receiver supply water temperature is 13 ± 1 DEG C, and return water temperature is 18 ± 1 DEG C; Described low temperature supplying coolant-temperature gage is 7 ± 1 DEG C, and return water temperature is 12 ± 1 DEG C.
4. according to claim 1 pair of low-temperature receiver three control air-conditioning system, is characterized in that, is provided with the first bypass pipe with flow sensor, the first valve sets between described low temperature water knockout drum and high temperature water collector or low temperature water collector; Described first valve sets is controlled by described high temperature low-temperature receiver or low temperature cold source:
During described high temperature low-temperature receiver isolated operation, described first bypass pipe is by low temperature water knockout drum and the independent conducting of high temperature water collector, and in described high temperature low-temperature receiver, unit opens controlled amounts in the flow feedback signal of described flow sensor;
When described high temperature low-temperature receiver and low temperature cold source run simultaneously, described first bypass pipe is by low temperature water knockout drum and the independent conducting of low temperature water collector, and in described low temperature cold source, unit opens controlled amounts in the flow feedback signal of described flow sensor.
5. according to claim 1 pair of low-temperature receiver three control air-conditioning system, is characterized in that, the pipeline between described high-temperature tempering pipe and high temperature low-temperature receiver entrance is provided with high temperature chilled water primary pump unit; Pipeline between described low-temperature return water pipe and low temperature cold source entrance is provided with cryogenic freezing water primary pump unit.
6. according to claim 5 pair of low-temperature receiver three control air-conditioning system, is characterized in that, also comprises the differential pressure pickup detected for pressure reduction between return pipe;
The first bypass pipe with flow sensor, the first valve sets, electric control valve is provided with between described low temperature water knockout drum and high temperature water collector or low temperature water collector; Described first valve sets is controlled by described high temperature low-temperature receiver and low temperature cold source;
During described high temperature low-temperature receiver isolated operation, described differential pressure pickup is for detecting pressure difference signal between feed pipe and high-temperature tempering pipe, the valve opening simultaneously controlled by high temperature low-temperature receiver in the first valve sets, described high temperature chilled water primary pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described high temperature chilled water primary pump unit list pump operation and this single pump works under low-limit frequency time open;
When described high temperature low-temperature receiver and low temperature cold source run simultaneously, described differential pressure pickup is for detecting pressure difference signal between feed pipe and low-temperature return water pipe, the valve opening simultaneously controlled by low temperature cold source in the first valve sets group, described cryogenic freezing water primary pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described cryogenic freezing water primary pump unit list pump operation and this single pump works under low-limit frequency time open.
7. according to claim 5 pair of low-temperature receiver three control air-conditioning system, it is characterized in that, described feed pipe is provided with chilled water two stage pump unit;
Also comprise the differential pressure pickup detected for pressure reduction between return pipe;
The second bypass pipe with electric control valve and the second valve sets is provided with between described feed pipe and high-temperature tempering pipe or low-temperature return water pipe; Described second valve sets is controlled by described high temperature low-temperature receiver and low temperature cold source;
During described high temperature low-temperature receiver isolated operation, described differential pressure pickup is for detecting pressure difference signal between feed pipe and high-temperature tempering pipe, the valve opening simultaneously controlled by high temperature low-temperature receiver in the second valve sets, described chilled water two stage pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described chilled water two stage pump unit list pump operation and this single pump works under low-limit frequency time open;
When described high temperature low-temperature receiver and low temperature cold source run simultaneously, described differential pressure pickup is for detecting pressure difference signal between feed pipe and low-temperature return water pipe, the valve opening simultaneously controlled by low temperature cold source in the second valve sets, described chilled water two stage pump unit is the variable frequency pump unit being controlled by described differential pressure pickup; Described electric control valve at described chilled water two stage pump unit list pump operation and this single pump works under low-limit frequency time open.
8. according to claim 1 pair of low-temperature receiver three control air-conditioning system, is characterized in that, also comprises the temperature sensor and humidity sensor that detect indoor and outdoor temperature and humidity; Described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.
9. according to claim 1 pair of low-temperature receiver three control air-conditioning system, it is characterized in that, also comprise the temperature sensor detected indoor temperature and the humidity sensor detected indoor humidity, described high temperature low-temperature receiver and low temperature cold source are controlled by this temperature sensor and humidity sensor simultaneously.
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| CN108844165A (en) * | 2018-09-18 | 2018-11-20 | 中国建筑西北设计研究院有限公司 | A kind of large-scale centralized air-conditioning system with distributed cold and heat source |
| CN108844165B (en) * | 2018-09-18 | 2023-12-05 | 中国建筑西北设计研究院有限公司 | Large-scale centralized air conditioning system with distributed cold and heat sources |
| CN109059155B (en) * | 2018-09-18 | 2024-04-09 | 中国建筑西北设计研究院有限公司 | Large-scale centralized air conditioning system capable of cooling and decentralized controlling independent operation |
| CN109506311A (en) * | 2018-12-14 | 2019-03-22 | 东南大学 | A kind of double cold source humiture independence control air conditioner systems of superposition type |
| CN110388708A (en) * | 2019-07-24 | 2019-10-29 | 中冶天工集团有限公司 | A kind of frequency controller for the air conditioner cold-heat source second level control system of water pump with multiple branches |
| CN110388708B (en) * | 2019-07-24 | 2024-02-06 | 中冶天工集团有限公司 | Frequency controller of air conditioner cold and heat source two-stage water pump control system |
| CN111536575A (en) * | 2020-04-17 | 2020-08-14 | 哈尔滨工业大学 | Water pump frequency conversion control method with tail end regulation and control function for heat pump heating system |
| CN113803855A (en) * | 2020-06-16 | 2021-12-17 | 江苏远视环境科技有限公司 | Three-point clamping position self-adaptive AHU control method and system |
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Effective date of registration: 20181220 Address after: 310000 Room 228, 3 Building, Dashi Hardware City, Jianggan District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Greenway Mechanical and Electrical Co., Ltd. Address before: 310000 No. 480, Shangcheng District, Hangzhou City, Zhejiang Province Patentee before: HANGZHOU LYUCHENG ENERGY SAVING TECHNOLOGY CO., LTD. |