CN101334203A - Method for enhancing cold-storage density of cold storage air conditioner system and cold storage air conditioner system - Google Patents
Method for enhancing cold-storage density of cold storage air conditioner system and cold storage air conditioner system Download PDFInfo
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Abstract
The invention relates to a cold storage density improving method for the cold storage air conditioning system and a cold storage air conditioning system. The method of the invention adopts the technical proposal that during the cold discharging stage, under the state that the refrigerating unit is started, a part of high-temperature cooling water is taken as low-temperature cooling water to replace the water cooling system to be supplied to the condenser of the refrigerating unit; when the cold storage is required, the high-temperature cooling water is refrigerated and is changed into the low-temperature refrigerated water by the condenser of the refrigerating unit. The cold storage air conditioning system of the invention comprises a refrigerating unit, a cold storage equipment, a chilled water pump, an air conditioning unit, a cooling water system, one to a plurality of low-temperature cooling water circulating pipelines and two to a plurality of high-temperature refrigerated water refrigeration pipelines. The cold storage density improving method for the cold storage air conditioning system and the cold storage air conditioning system have the advantages that electric power consumption in the power consumption peak time can be more reduced, the operation cost can be reduced, and the cold storage density can be increased, thereby a positive effect can be taken on the peak load shifting of the electric network.
Description
Technical field
The present invention relates to a kind of method and a kind of chilling air conditioning system that improves the chilling air conditioning system storage density of cold.
Background technology
Since reform and opening-up, power industry has obtained significant progress as one of basic industry of national economy.But the needs of fast development of national economy and people's lives electricity consumption sharp increase are not still satisfied in the growth of electric power, and national short of electricity situation still exists, the network load rate is low, system's peak-valley difference strengthens, and the peak power wretched insufficiency causes electrical network often to draw in the net to ration the power supply.Effectively the electric weight of peak period being transferred to the low ebb phase, make whole electrical network electricity consumption more even, can reduce the planned capacity of electrical network, save huge electric power capital expenditure, is to alleviate power construction, effectively utilizes the important channel of electrical network.
In building energy consumption, owing to the air conditioner refrigerating electricity consumption strengthens day by day, and overlapping with the electrical network peak of power consumption, be to cause China's peak of power consumption in summer electricity consumption in period deficiency, draw in the net to ration the power supply, and electrical network low ebb phase electric weight is more than needed, the major reason of the uneconomical operation of electrical network.
National Development and Reform Committee in 2004 and Electricity Monitoring Commission unite and have issued " strengthening the instruction of demand Side Management work ", and " knowing suggestion " requires " to widely popularize accumulation of energy, comprise transfer load class technical measures such as cold-storage, accumulation of heat.
Technology of Cold Storage Air Conditions is in the valley power time cold to be stored in the cold-storage groove, cold is discharged when the peak again, satisfies the needs of building air-conditioning or production technology.With the conventional air-conditioning systematic comparison, have the following advantages:
(1) cold accumulation air-conditioner makes full use of night electricity by shifting the running time of refrigeration plant, reduces the peak value power consumption, becomes the most potential approach of electric power peak load shifting, has economic benefit and equipment benefit concurrently.
(2) make equipment in high efficiency point operation, avoided main frame to change with the variation of air conditioner load, the problem that main frame efficient is reduced has been saved the operation electric weight of air-conditioning, has improved the safety in operation of main frame, has prolonged the service life of main frame.
(3) reduced the installed capacity of air conditioner cold-heat source device.Saved initial cost.
(4) under the situation of electricity shortage, satisfy the air-conditioning requirement of building as standby cold and heat source.For the cold air-conditioning of technology, avoided shutting down the generation that causes the equipment defective work suddenly because of air-conditioning.
(5) for cooling tower or air-cooled heat pump, because night, environment temperature was low, condensation temperature descends, and the coefficient of performance of refrigeration unit (COP) improves, and has saved operating cost.
Chilling air conditioning system commonly used now has two kinds of forms:
1, water cold-storage form: a kind of water chilling air conditioning system for example shown in Figure 1, it comprises handpiece Water Chilling Units 11, cold-storage apparatus, chilled water pump 12, air-conditioning unit 13, cooling water pump 15 and cooling tower 14, cold-storage apparatus comprises cryogenic freezing water cold-storage groove 17 and high temperature chilled water cold-storage groove 18, the feed pipe of described air-conditioning unit 13 is connected with cryogenic freezing water cold-storage groove 17, the return pipe of air-conditioning unit 13 is connected with high temperature chilled water cold-storage groove 18, chilled water pump 12 is located on the feed pipe of air-conditioning unit 13, between high temperature chilled water cold-storage groove 18 and cryogenic freezing water cold-storage groove 17, be provided with high temperature chilled water refrigeration pipe through handpiece Water Chilling Units evaporimeter 111, between the water inlet end of high temperature chilled water cold-storage groove 18 and handpiece Water Chilling Units evaporimeter 111, be provided with chilled water circulating pump 16, the water inlet end of handpiece Water Chilling Units condenser 112, the water side is connected with cooling tower 14 by pipeline, and cooling water pump 14 is located between the water inlet end and cooling tower 14 of condenser 112.The advantage of chilled water storage system is that initial cost is lower, and is simple in structure, convenient management.Shortcoming is: storage density of cold is lower, and needed space is bigger.
2, ice cold-storage form: advantage is that storage density of cold is bigger, and needed space is little, but its shortcoming is that its initial cost is higher, complex structure, maintenance management complexity.
The operating scheme of conventional cold accumulation air-conditioner is: at the electricity consumption low peak period high temperature chilled water in the cold-storage apparatus is become cryogenic freezing water or ice, in peak times of power consumption cryogenic freezing water or ice are become the high temperature chilled water again as the refrigeration duty of air-conditioning unit, when the air-conditioning refrigeration duty is higher than the refrigeration duty that cold-storage apparatus can store, need to open cooling tower and refrigeration unit provides refrigeration duty to the air-conditioning unit.
Summary of the invention
First purpose of the present invention is to provide a kind of method that can improve the chilling air conditioning system storage density of cold at the problems referred to above of existing chilling air conditioning system existence, and it can improve refrigeration unit efficient, reduces the power consumption of peak times of power consumption, reduces operating cost.
Second purpose of the present invention is to provide a kind of chilling air conditioning system that can reduce initial cost, improve storage density of cold and refrigerating efficiency.
First purpose of the present invention is achieved in that at cold-storage apparatus puts the cold stage, under the refrigeration unit opening, cryogenic freezing water is treated as the cooling water that low-temperature cooling water replaces cooling water system through the high temperature chilled water that the air-conditioning unit becomes, the cold in-water temperature that can allow with the refrigeration unit condenser offers condenser, the high temperature chilled water is at cold-storage apparatus, form the low-temperature cooling water circulation in the refrigeration unit, circulate the further high temperature chilled water that raises of back temperature again through 0～several low-temperature cooling water circulations through low-temperature cooling water, every temperature through a cyclic high-temperature chilled water further raises, and does not need to open cooling water system in this process; When the need cold-storage, open cooling water system, the high temperature chilled water in the cold-storage apparatus is freezed through evaporimeter with the chilled water inflow temperature that the refrigeration unit evaporimeter is allowed, up to becoming cryogenic freezing water or ice-reserving.
As scheme preferably, put the cold stage described in the present invention to move in peak times of power consumption, the described cold-storage stage is in low power consumption phase or non-operation service time of air-conditioning.
Method of the present invention is applicable to water chilling air conditioning system or ice-chilling air conditioning system.
Second purpose of the present invention is achieved in that chilling air conditioning system of the present invention comprises refrigeration unit, cold-storage apparatus, chilled water pump, air-conditioning unit, cooling water system, it is characterized in that: also be provided with 1～several sub-cooled water circulation pipes, each sub-cooled water circulation pipe is by pipeline cold-storage apparatus and refrigeration unit condenser, condenser and cold-storage apparatus to be connected and composed successively, and is provided with the sub-cooled water-circulating pump on the feed pipe of condenser; Also be provided with 2～several high temperature chilled water refrigeration pipes, each high temperature chilled water refrigeration pipe is to be connected between the chilled water of the different temperatures in the cold-storage apparatus and through the evaporimeter of refrigeration unit, the feed pipe of evaporimeter is provided with the high temperature chilled water circulating pump by pipeline; On above-mentioned each pipeline, be equipped with electric control valve, on the condenser feed pipe of sub-cooled water circulation pipe, be provided with the inflow temperature that guarantees condenser and satisfy the temp control switch that the refrigeration unit cold in-water temperature requires; On the evaporimeter feed pipe of high temperature chilled water refrigeration pipe, be provided with the inflow temperature that guarantees evaporimeter and satisfy the temp control switch that refrigeration unit chilled water inflow temperature requires.
Chilling air conditioning system of the present invention is water cold-storage or ice-chilling air conditioning system.
As scheme preferably, the cold-storage apparatus among the present invention comprises a big cold-storage groove, vertical barrier film is being set in big cold-storage groove is constituting two to several little cold-storage grooves, and the chilled water of different temperatures is saved in different little cold-storage grooves.
Refrigeration unit among the present invention is one or more.
The heat-exchanger rig of cooling water system is cooling tower or lake water or soil etc. among the present invention.
Principle of the present invention is as follows:
As everyone knows, for refrigeration unit, reduce condensation temperature (cooling water temperature) or rising evaporating temperature (entering the chilled water temperature of evaporimeter), refrigeration unit efficient all will raise.Some data show that cooling water temperature reduces, and refrigeration unit efficient can improve about 50%～60%.
The present invention is freezed the high temperature chilled water as the condenser that low-temperature cooling water offers refrigeration unit, because the temperature of high temperature chilled water is far below the temperature of cooling water, condensation temperature reduces, improved the efficient of refrigeration unit, do not need simultaneously to open the heat-exchanger rig of power consumption such as cooling tower, reduced the operation electricity charge of air-conditioning.After freezing by refrigeration unit, the high temperature freezing temperature continues to raise as temperature behind the low-temperature cooling water.
The present invention is when cold-storage, the evaporimeter cryogenic temperature of high temperature chilled water through refrigeration unit reduced, become cryogenic freezing water at last, because high temperature chilled water temperature height, evaporating temperature raises, and has improved the efficient of refrigeration unit, especially at night of low power consumption phase, outdoor temperature is low, and is lower by the cooling water temperature of cooling tower than daytime by the cooling water temperature behind the cooling tower, also improved unit efficiency.
Therefore technique effect of the present invention is: the present invention can increase the temperature difference (than high 20 degree even higher of conventional water cold accumulation air-conditioner) of chilled water in the cold-storage apparatus, has reduced the capacity of cold-storage apparatus, has reduced initial cost; The present invention has more reduced the power consumption of peak times of power consumption than conventional cold accumulation system, reduces operating cost, has increased storage density of cold.The present invention has positive effect to the peak load shifting of electrical network.
Description of drawings
Fig. 1 is the structure chart of existing a kind of water chilling air conditioning system.
Fig. 2 is the structure chart of a kind of water chilling air conditioning system of the present invention.
Fig. 3 is that water chilling air conditioning system shown in Figure 2 is being put the operation schematic diagram in cold stage.
Fig. 4 is that water chilling air conditioning system shown in Figure 2 is at the operation schematic diagram of the high temperature chilled water being worked as the low-temperature cooling water stage.
Fig. 5, Fig. 6 are the operation schematic diagram of water chilling air conditioning system shown in Figure 2 in the cold-storage stage.
The specific embodiment
The highest inflow temperature of chilled water is made as 17 degree in the water chilling air conditioning system shown in Figure 2, and the minimum inflow temperature of cooling water is made as 17 degree, and this temperature can and require according to system's concrete condition to set.
Referring to Fig. 2, a kind of water chilling air conditioning system of the present invention, it comprises refrigeration unit 1, high temperature chilled water circulating pump 2, chilled water pump 3, air-conditioning unit 4, cooling tower 5, sub-cooled water-circulating pump 6, cooling water pump 7, cold-storage groove 8, cold-storage groove 9, cold-storage groove 10; Described refrigeration unit 1 comprises evaporimeter 101 and condenser 102; Described cold-storage groove 8 to 10 is by a big cold-storage groove vertical barrier film to be set to form, cold-storage groove 8 is that cryogenic freezing water holds groove, cold-storage groove 9, cold-storage groove 10 are that the high temperature chilled water holds groove, save the high temperature chilled water of different temperatures respectively, each water inlet and delivery port place at cold- storage groove 8,9,10 are provided with an electric control valve, and they are electric control valve K1, K2, K3, K4, K5, K6, K7, K8.
Referring to Fig. 2 to Fig. 6, present embodiment is provided with following several pipeline:
1, cryogenic freezing water is put cold pipeline:
Cold-storage groove 8 is connected with the feed pipe of air-conditioning unit 4, and the return pipe of air-conditioning unit 4 is connected with cold-storage groove 9, establishes chilled water pump 3 on the feed pipe of air-conditioning unit 4.
Between the confession of air-conditioning unit 4, water return pipeline, by-pass line L2 is set, motor regulated valve K11 is set on by-pass line L2.Electric control valve K10 and temp control switch T2 are set on the water supply line of air-conditioning unit 4,, guarantee that supply water temperature is constant according to the adjustment flow.
2, sub-cooled water circulation pipe:
Cold-storage groove 9 is connected with the water inlet end of refrigeration unit condenser 102 through low-temperature cooling water feed pipe L1, and the water side of condenser 102 is connected with cold-storage groove 10 through the low-temperature cooling water return pipe.One by-pass line L5 is set between low-temperature cooling water feed pipe L1 and low-temperature cooling water return pipe, on this by-pass line L5, is provided with electric control valve K9.On low-temperature cooling water feed pipe L1 temp control switch T1 is set, control electric control valve K3, K9 guarantee that the inflow temperature of refrigeration unit condenser 102 satisfies minimum refrigeration inflow temperature 17 degree of refrigeration unit 1 cooling water.The high temperature chilled water that becomes higher temperature behind the high temperature chilled water process refrigeration unit condenser 102 in the cold-storage groove 9 flows in the cold-storage groove 10.
Present embodiment only is provided with a sub-cooled water circulation pipe, the present invention can also be provided with more as two or several sub-cooled water circulation pipes, for example the high temperature chilled water in the cold-storage groove 10 also can be re-used as low-temperature cooling water and offer refrigeration unit condenser 102, the high temperature chilled water that temperature further raises is re-used as low-temperature cooling water ..., be elevated to until the temperature of high temperature chilled water and equate with the temperature of conventional cooling water or approaching.
3, high temperature chilled water refrigeration pipe:
High temperature chilled water refrigeration pipe comprises two:
(1) cold-storage groove 10 links to each other with the water inlet end of refrigeration unit evaporimeter 101 after pipeline and high temperature chilled water circulating pump 2 serial connections, and the water side of refrigeration unit evaporimeter 101 links to each other with cold-storage groove 9 through pipeline.Also be provided with by-pass line L6 in the aforementioned tube roadside and be provided with electric control valve K5, on the pipeline between cold-storage groove 10 and the refrigeration unit evaporimeter 101, temp control switch T3 is set, control electric control valve K4, K5 guarantee that the inflow temperature of refrigeration unit evaporimeter 101 satisfies the highest refrigeration inflow temperature of refrigeration unit 1 chilled water (present embodiment is made as 17 degree).
(2) cold-storage groove 9 links to each other with the water inlet end of refrigeration unit evaporimeter 101 after pipeline and high temperature chilled water circulating pump 2 serial connections, and the water side of refrigeration unit evaporimeter 101 links to each other with cold-storage groove 8 through pipeline.
The quantity of high temperature chilled water refrigeration pipe is relevant with the quantity of sub-cooled water circulation pipe, when sub-cooled water circulation pipe more, because the maximum temperature of high temperature chilled water is higher, more high temperature chilled water refrigeration pipe need be set could become cryogenic freezing water at last with the high temperature chilled water.
At above-mentioned two high temperature chilled water refrigeration pipes, the water side of refrigeration unit evaporimeter 101 links to each other with cold-storage groove 8, cold-storage groove 9 respectively by chilled water pipe L4 again, temp control switch T4 is set, according to the unlatching of temperature control electric control valve K6, K7 on chilled water pipe L4.
4, cooling water circulation line:
The water inlet end of refrigeration unit condenser 102, water side are connected with cooling tower 5 by pipeline, cooling water pump 7 is located between the water inlet end and cooling tower 5 of condenser 102, on two water supply lines of condenser 102, electric control valve K12, K13 are set, on two outlet conduits, electric control valve K14, K15 are set, carry out the unify conversion of low-temperature cooling water circulation line of cooling water system by their switch.
In the above-mentioned pipeline, the pipeline that the (2), the 4th pipeline in the 1st, the 3rd just has for existing chilling air conditioning system, (1) pipeline in the 2nd, the 3rd is that the present invention is distinctive.
Above-mentioned water chilling air conditioning system can move according to the following procedure:
When 1, beginning, for cryogenic freezing water (present embodiment is set at 7 degree), be full of whole cold-storage groove 8 in the cold-storage groove 8.
2, cold-storage groove is put the cold stage: referring to Fig. 3, in peak times of power consumption, open chilled water pump 3, open electric control valve K1, K8, cryogenic freezing water becomes high temperature chilled water (present embodiment is set at 12 degree) through chilled water pump 3, air-conditioning unit 4 to be got back in the cold-storage groove 9, and electric control valve K10, K11 regulate the chilled water flow of inlet water according to temp control switch T2.Refrigeration unit 1 and cooling tower 5 do not move in this course.
3, the high temperature chilled water is worked as the low-temperature cooling water stage:
Referring to Fig. 4, open refrigeration unit 1, chilled water pump 3, high temperature chilled water circulating pump 2, sub-cooled water-circulating pump 6, open electric control valve k13, k14, close electric control valve K12, K15, according to the size of temp control switch T1 adjustment electric control valve K3, K9, guarantee that low-temperature cooling water reaches refrigeration unit condenser 102 cooling water minimum temperatures and requires (present embodiment is 17 degree).High temperature chilled water in the cold-storage groove 9 is divided into two parts:
(1) part high temperature chilled water (12 degree) enters cold-storage groove 8 after becoming cryogenic freezing water (7 degree) by refrigeration unit evaporimeter 101, for air-conditioning unit 4 provides refrigeration duty.
(2) part high temperature chilled water (12 degree) is as low-temperature cooling water, adjust the flow of electric control valve K3, K9 by temp control switch T1, pass through refrigeration unit condenser 102 with 102 minimum temperatures that can allow of refrigeration unit condenser (17 degree), temperature continues to raise, and the high temperature chilled water that becomes 22 degree enters in the cold-storage groove 10.
Said process constantly circulates, and the chilled water in cold-storage groove 8 all becomes the high temperature chilled water of 22 degree.
4, the cold-storage stage:
In the low power consumption phase, open refrigeration unit 1, high temperature chilled water circulating pump 2, cooling tower 5, cooling water pump 7 are closed electric control valve K13, K14, open electric control valve K12, K13, and the cold-storage stage carries out in two steps:
(1) referring to Fig. 5, the high temperature chilled water of 22 degree is adjusted electric control valve K4, K5 by temp control switch T3 in the cold-storage groove 10, guarantee that the high temperature chilled water becomes the chilled water of 12 degree by refrigeration unit 1 with 101 maximum temperatures that can allow of refrigeration unit evaporimeter (17 degree), open electric control valve K7 by temp control switch T4, close electric control valve K6, the chilled water of 12 degree enters cold-storage groove 9.Chilled water up to 22 degree all becomes 12 degree.
(2) referring to Fig. 6, the high temperature chilled water of the degree of 12 in the cold-storage groove 9 is by refrigeration unit 1, become the cryogenic freezing water of 7 degree, close electric control valve K7 by temperature switch T4, open electric control valve K6,7 the degree the cryogenic freezing water enter cold-storage groove 8, in cold-storage groove 9 all high temperature chilled waters all become 7 the degree the cryogenic freezing water save in cold-storage groove 8.Process of cool finishes.
Except the foregoing description, under the present invention's design, multiple variation can also be arranged, these variations include within protection scope of the present invention.
Claims (6)
1. method that improves the chilling air conditioning system storage density of cold is characterized in that:
Put the cold stage at cold-storage apparatus, under the refrigeration unit opening, cryogenic freezing water is treated as the cooling water that low-temperature cooling water replaces cooling water system through the high temperature chilled water that the air-conditioning unit becomes, the cold in-water temperature that can allow with the refrigeration unit condenser offers condenser, the high temperature chilled water is at cold-storage apparatus, form the low-temperature cooling water circulation in the refrigeration unit, circulate the further high temperature chilled water that raises of back temperature again through 0～several low-temperature cooling water circulations through low-temperature cooling water, every temperature through a cyclic high-temperature chilled water further raises, and does not need to open cooling water system in this process;
When the need cold-storage, open cooling water system, the high temperature chilled water in the cold-storage apparatus is freezed through evaporimeter with the chilled water inflow temperature that the refrigeration unit evaporimeter is allowed, up to becoming cryogenic freezing water or ice-reserving.
2. the method for raising chilling air conditioning system storage density of cold according to claim 1 is characterized in that: described chilling air conditioning system is water chilling air conditioning system or ice-chilling air conditioning system.
3. the method for raising chilling air conditioning system storage density of cold according to claim 1 and 2 is characterized in that: describedly put the cold stage and move in peak times of power consumption, the described cold-storage stage is in low power consumption phase or non-operation service time of air-conditioning.
4. chilling air conditioning system, comprise refrigeration unit, cold-storage apparatus, chilled water pump, air-conditioning unit, cooling water system, it is characterized in that: also be provided with 1～several sub-cooled water circulation pipes, each sub-cooled water circulation pipe is by pipeline cold-storage apparatus and refrigeration unit condenser, condenser and cold-storage apparatus to be connected and composed successively, and is provided with the sub-cooled water-circulating pump on the feed pipe of condenser; Also be provided with 2～several high temperature chilled water refrigeration pipes, each high temperature chilled water refrigeration pipe is to be connected between the chilled water of the different temperatures in the cold-storage apparatus and through the evaporimeter of refrigeration unit, the feed pipe of evaporimeter is provided with the high temperature chilled water circulating pump by pipeline; On above-mentioned each pipeline, be equipped with electric control valve, on the condenser feed pipe of sub-cooled water circulation pipe, be provided with the inflow temperature that guarantees condenser and satisfy the temp control switch that the refrigeration unit cold in-water temperature requires; On the evaporimeter feed pipe of high temperature chilled water refrigeration pipe, be provided with the inflow temperature that guarantees evaporimeter and satisfy the temp control switch that refrigeration unit chilled water inflow temperature requires.
5. chilling air conditioning system according to claim 4, it is characterized in that: described cold-storage apparatus comprises a big cold-storage groove, vertical barrier film is set in big cold-storage groove constitutes two to several little cold-storage grooves, the chilled water of different temperatures is saved in different little cold-storage grooves.
6. according to claim 4 or 5 described chilling air conditioning systems, it is characterized in that: described handpiece Water Chilling Units is one or more.
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| CN102042649A (en) * | 2010-12-29 | 2011-05-04 | 广东迪奥技术工程有限公司 | Dynamic ice storage ice-melting system capable of watering at constant low temperature |
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| CN102679636A (en) * | 2012-05-31 | 2012-09-19 | 长沙泰和英杰系统集成工程有限责任公司 | Phase-change energy-storage evaporative condenser and condenser control method |
| CN102679636B (en) * | 2012-05-31 | 2014-08-20 | 长沙泰和英杰系统集成工程有限责任公司 | Phase-change energy-storage evaporative condenser |
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