CN100455920C - Regional cold supply system and its cold step utilizing method - Google Patents
Regional cold supply system and its cold step utilizing method Download PDFInfo
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- CN100455920C CN100455920C CNB2006101227959A CN200610122795A CN100455920C CN 100455920 C CN100455920 C CN 100455920C CN B2006101227959 A CNB2006101227959 A CN B2006101227959A CN 200610122795 A CN200610122795 A CN 200610122795A CN 100455920 C CN100455920 C CN 100455920C
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- air cooler
- chilled water
- cold
- water
- fresh air
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Abstract
The present invention relates to provides one kind of regional cold supply system, which includes one secondary refrigerated water pipeline with refrigerated water supplying pipe, refrigerated water returning pipe, fresh air cooler and returned air cooler. The fresh air cooler and the returned air cooler are independent, the returned air cooler has water inlet connected to the refrigerated water supplying pipe and water outlet connected to the water inlet of the fresh air cooler, and the fresh air cooler has water outlet connected to the refrigerated water returning pipe. The present invention has increased water supply and water return temperature difference of the secondary refrigerated water pipeline, lowered cold loss, lowered pump power consumption and lowered cost.
Description
Technical field
The present invention relates to the regional cold supply system power-saving technology, specifically be meant a kind of regional cold supply system and cold cascade utilization method thereof.
Background technology
The energy occupancy volume per person of China is well below world average level, and present stage China's energy user demand increases fast, and imbalance between supply and demand is sharp-pointed.The only way that solves the present energy predicament of China is the science energy, improves efficiency of energy utilization.30% of China's building energy consumption account whole nation total energy consumption, specific energy consumption is far above developed country; Heating ventilation air-conditioning system is with accounting for 65% in the building use energy consumption, and the domestic hot-water is with accounting for 15%.The energy-conservation of heating ventilation air-conditioning system is the key of building energy conservation.
Regional cold supply system has the efficiency of energy utilization height, the refrigeration plant installed capacity is little, the operational management personnel are few, environmental protection, help the characteristics such as raising of energy cascade utilization, building aesthetic property and space availability ratio.Regional cold supply system is since coming out the sixties in 20th century, and is very extensive in all over the world application.Especially since the early 1990s, the development of district cooling is more rapid.The district cooling technology of China also presents good development circumstances.
Along with China develops and introduces natural gas resource energetically, optimize the enforcement of the policies such as energy resource structure of China, the combustion gas distributed energy resource system that utilize mode efficient, the most most economical as natural gas will be developed fast.On the other hand, along with quickening, the raising of living standards of the people and the warming of global climate of Urbanization in China, the cooling load is powerful with demand growth, will promote the development of regional cold supply system in China greatly.Combustion gas distributed energy resource system+regional cold supply system is the effective way that solves China's energy supply and demand contradiction, and the two has bright development prospect.
Though regional cold supply system has many advantages, energy consumption and expense below conventional relatively central air conditioner system has had more: the cold damage of the chilled water secondary pipeline of regional cold supply system (promptly by the transmission pipeline network of central refrigeration plant), the energy consumption of secondary pump, the initial cost and the operating expenses of secondary pipeline to the chilled water the user.In addition, the economic fed distance of chilled water is owing to the reason of the energy consumption of cold damage and pump is restricted, and at present general economic fed distance is at 1.6km.Therefore, for regional cold supply system, the initial cost of the cold damage of its chilled water secondary pipeline and the energy consumption of secondary pump and secondary pipeline has weakened its advantage.Also be to be related to the key issue that can this system promote.
The supply and return water temperature difference maximum of the secondary pipeline of the chilled water of present district cooling is about 10 ℃.The cold mode of the usefulness of its end-equipment has two kinds:
(1) central air-conditioning system
Central air-conditioning system generally is used in the place of large spaces such as market, library, dining room, cinema.The cold mode of the usefulness of the end-equipment of this system is: new wind and return air mix earlier, handle to needed temperature and humidity through surface cooler again, deliver in the air-conditioned room then.
(2) fan coil+fresh air conditioner system
Fan coil+fresh air conditioner system is used in places such as hotel, office building.The cold mode of the usefulness of the end-equipment of this system is: the return air in each room carries out cooling and dehumidifying by the fan coil (surface cooler) that is arranged in the room, and new wind generally is every layer and sends into each room after concentrating cooling and dehumidifying by one or several new blower fan groups (surface cooler), and the chilled water of surface cooler of handling new wind and return air is identical for, return water temperature.
The cold damage of chilled water secondary pipeline and the energy consumption of secondary pump all can reduce with the minimizing of chilled-water flow.Therefore by strengthening the supply backwater temperature difference of secondary pipeline, can reduce the cold damage of secondary pipeline and the energy consumption of secondary pump.Improve the temperature difference for backwater of secondary pipeline, must traditional end-equipment be improved just and might realize with cold mode by adopting new technology.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of regional cold supply system is provided, it can improve the supply backwater temperature difference of secondary pipeline, thereby reduces the cold damage of secondary pipeline and the energy consumption of secondary pump.
The present invention also aims to provide the cold cascade utilization method of above-mentioned zone cold supply system.
Purpose of the present invention is achieved through the following technical solutions: the one's respective area cold supply system, it comprises chilled water feed pipe, chilled water return pipe and fresh air cooler, the returned air cooler of chilled water secondary pipeline, both are separate for described fresh air cooler, returned air cooler, described chilled water feed pipe connects the water inlet of returned air cooler, the chilled water return pipe connects the delivery port of fresh air cooler, and the chilled water delivery port of described returned air cooler is connected with the chilled water import of fresh air cooler.
The cold cascade utilization method of above-mentioned zone cold supply system, be meant new wind and return air are cooled off by both separate fresh air coolers, returned air cooler, after the chilled water of chilled water secondary pipeline enters returned air cooler by the chilled water feed pipe earlier and temperature is low, the little return air of water capacity carries out heat exchange, enter fresh air cooler and temperature height again, new wind that water capacity is big carries out heat exchange, enters the chilled water return pipe at last.Thereby in same indoor heat, humidity load, and keep under the prerequisite of identical comfortableness, realize the chilled water return water temperature is improved, flow reduces.
The present invention compared with prior art, have following advantage and beneficial effect: the present invention is from the science energy, the temperature counterpart, the angle of cascade utilization, the supply and return water temperature that strengthens chilled water secondary pipeline by the cold mode of the usefulness of new end-equipment is poor, thereby reduce cold damage, the energy consumption of pump and the initial cost of pipeline of chilled water secondary pipeline, can also enlarge simultaneously the economic fed distance of chilled water, the cooling area of enlarged area cold supply system and scale are increased economic efficiency and efficiency of energy utilization.
Description of drawings
Fig. 1 is that the end of traditional central air-conditioning system is with cold mode schematic diagram;
Fig. 2 is that traditional fan coil+fresh air conditioner system is terminal with cold mode schematic diagram;
Fig. 3 is that the end of a kind of regional cold supply system of the present invention is with cold mode schematic diagram.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment one
Fig. 1 is that the end of traditional central air-conditioning system is with cold mode schematic diagram;
Fig. 2 is that traditional fan coil+fresh air conditioner system is terminal with cold mode schematic diagram;
Fig. 3 is that the end of a kind of regional cold supply system of the present invention is with cold mode schematic diagram;
As shown in Figure 3, the one's respective area cold supply system, it comprises chilled water feed pipe 1, chilled water return pipe 2 and fresh air cooler 3, the returned air cooler 4 of chilled water secondary pipeline, both are separate for fresh air cooler 3, returned air cooler 4, chilled water feed pipe 1 connects the water inlet of returned air cooler 4, chilled water return pipe 2 connects the delivery port of fresh air cooler 3, and the chilled water delivery port of returned air cooler 4 is connected with the chilled water import of fresh air cooler 3.
The one's respective area cold supply system is performed such the cold cascade utilization: new wind and return air are cooled off by both separate fresh air coolers 3, returned air cooler 4, the chilled water of chilled water secondary pipeline earlier by chilled water feed pipe 1 enter that returned air cooler 4 is low with temperature, after the little return air of water capacity carries out heat exchange, enter fresh air cooler 3 and temperature height again, new wind that water capacity is big carries out heat exchange, enters chilled water return pipe 2 at last.Thereby in same indoor heat, humidity load, and keep under the prerequisite of identical comfortableness, realize the chilled water return water temperature is improved, flow reduces.
Specific design parameter and computational process are as follows: the former design parameter of regional cold supply system chilled water secondary pipeline: supply water temperature is T
S1=3.5 ℃, return water temperature is T
H1=13.5 ℃, supply and return water temperature difference Δ T
1=10 ℃.The secondary pipeline is carried cold 30000kW, chilled water pipe internal diameter 600mm, and the flow velocity 2.54m/s of water, adopting thickness is the polyurethane insulation of 90mm, underground pipe centre distance ground 1.6m is for the horizontal range 1m at return pipe center.2 of secondary pumps, every flow 1290m
3/ h, lift 30m, power 140kW.
End by adopting a kind of regional cold supply system of the present invention with cold mode after, the constant (T of supply water temperature
S2=3.5 ℃), return water temperature is brought up to T
H2=18.5 ℃, the supply and return water temperature difference is enlarged to Δ T
2=15 ℃.After now calculating the increasing of secondary pipeline supply backwater temperature difference, the variation of the cold damage of the caliber of secondary pipeline, the power of secondary pump and secondary pipeline.
(1) caliber of chilled water secondary pipeline
20% of on-way resistance is got in the local resistance of chilled water secondary pipeline.When the changes in flow rate of secondary pipeline, it is constant to establish steel pipe equivalent roughness, and keeping the drag overall of pipeline constant by the way of adjusting caliber (is Δ P
1=Δ P
2).The relation of the variation of caliber and flow can be derived by hydromechanical correlation formula:
If corresponding to Δ T
1The volume flow of the chilled water in the time of=10 ℃ is L
1(m
3/ s), then as Δ T
2In the time of=15 ℃, its volume flow is L
2=0.667L
1(m
3/ s), d
2=0.857d
1=0.857 * 600=514mm.Therefore, after the temperature of chilled water secondary pipeline was elevated to 15 ℃ by 10 ℃, flow reduced 33.3%; It is constant to keep drag overall by the method for adjusting caliber, and caliber reduces 14.3%.
(2) secondary pump power
After the temperature of chilled water secondary pipeline is elevated to 15 ℃ by 10 ℃, owing to the drag overall of keeping pipeline by the method for adjusting caliber is constant, so secondary pump lift and efficient can be considered by not changing.The Changing Pattern of the electrical power of secondary pump is: N
2=0.667N
1, i.e. the power reduction of secondary pump 33.3%.Also adopt 2 secondary pumps after the changes in flow rate, the parameter change of every pump is: flow 860m
3/ h, lift 30m, power 93.4kW.
(3) the cold damage of secondary pipeline
The cold damage of regional cold supply system secondary pipeline comprises two parts: by cold damage (the Δ Q of pipeline biography to soil
1) and cold damage (the Δ Q that causes of the input power of water pump
2).
By cold damage (the Δ Q of pipeline biography to soil
1) reducing and reduce with the increasing of the temperature difference of chilled water in the pipe and caliber.
Must supply as calculated/return water temperature is 3/13 ℃ of (Δ T
1=10 ℃) time, Δ Q
1=202.6kW, when the return water temperature of regional cold supply system is brought up to 18 ℃, constant (the Δ T of supply water temperature
2=15 ℃) time, Δ Q
1=152.7kW.After the supply backwater temperature difference of secondary pipeline strengthens, by the cold damage Δ Q of pipeline biography to soil
1Reduce 24.6%.
The cold damage Δ Q that the input power of water pump causes
2Reducing and reduce with the water pump input power.When the supply backwater temperature difference of chilled water was 10 ℃, the general power of secondary pump was 280kW; When the supply backwater temperature difference of chilled water was 15 ℃, the general power of secondary pump was 186.8kW, Δ Q
2Reduce 33.3%.
After the temperature of chilled water secondary pipeline was elevated to 15 ℃ by 10 ℃, the total cold damage of regional cold supply system secondary pipeline was reduced to 339.5kW by 482.6kW, has reduced 29.6%.
As mentioned above, just can realize the present invention preferably.
Claims (2)
1, a kind of regional cold supply system, it comprises chilled water feed pipe, chilled water return pipe and fresh air cooler, the returned air cooler of chilled water secondary pipeline, it is characterized in that: both are separate for described fresh air cooler, returned air cooler, described chilled water feed pipe connects the water inlet of returned air cooler, the chilled water return pipe connects the delivery port of fresh air cooler, and the chilled water delivery port of described returned air cooler is connected with the chilled water import of fresh air cooler.
2, the cold cascade utilization method of the described a kind of regional cold supply system of claim 1, it is characterized in that: new wind and return air are cooled off by both separate fresh air coolers, returned air cooler, after the chilled water of chilled water secondary pipeline enters returned air cooler by the chilled water feed pipe earlier and temperature is low, the little return air of water capacity carries out heat exchange, enter fresh air cooler and temperature height again, new wind that water capacity is big carries out heat exchange, enters the chilled water return pipe at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101227959A CN100455920C (en) | 2006-10-17 | 2006-10-17 | Regional cold supply system and its cold step utilizing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101227959A CN100455920C (en) | 2006-10-17 | 2006-10-17 | Regional cold supply system and its cold step utilizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1945137A CN1945137A (en) | 2007-04-11 |
| CN100455920C true CN100455920C (en) | 2009-01-28 |
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ID=38044658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101227959A Expired - Fee Related CN100455920C (en) | 2006-10-17 | 2006-10-17 | Regional cold supply system and its cold step utilizing method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278795B (en) * | 2011-07-25 | 2013-07-24 | 浙江大学 | Central air-conditioning air supply system adopting double cooling coils |
| CN107894051B (en) * | 2017-12-15 | 2023-11-24 | 华南理工大学建筑设计研究院有限公司 | Regional energy station cooling center transferring and cascade utilization system based on waste heat refrigeration |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4125148A (en) * | 1976-01-07 | 1978-11-14 | Stainless Equipment Company | Method for utilization of waste energy |
| US5309725A (en) * | 1993-07-06 | 1994-05-10 | Cayce James L | System and method for high-efficiency air cooling and dehumidification |
-
2006
- 2006-10-17 CN CNB2006101227959A patent/CN100455920C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4125148A (en) * | 1976-01-07 | 1978-11-14 | Stainless Equipment Company | Method for utilization of waste energy |
| US4129179A (en) * | 1976-01-07 | 1978-12-12 | Stainless Equipment Company | Apparatus for utilization of waste energy |
| US5309725A (en) * | 1993-07-06 | 1994-05-10 | Cayce James L | System and method for high-efficiency air cooling and dehumidification |
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| Publication number | Publication date |
|---|---|
| CN1945137A (en) | 2007-04-11 |
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Granted publication date: 20090128 Termination date: 20121017 |