WO2017045459A1 - 重力热管式冷源蓄冷系统及冷水机组 - Google Patents

重力热管式冷源蓄冷系统及冷水机组 Download PDF

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Publication number
WO2017045459A1
WO2017045459A1 PCT/CN2016/088063 CN2016088063W WO2017045459A1 WO 2017045459 A1 WO2017045459 A1 WO 2017045459A1 CN 2016088063 W CN2016088063 W CN 2016088063W WO 2017045459 A1 WO2017045459 A1 WO 2017045459A1
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Prior art keywords
cold storage
tube
storage system
heat pipe
gravity
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PCT/CN2016/088063
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English (en)
French (fr)
Inventor
张卫星
张宗勤
袁祎
王凌云
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南京佳力图机房环境技术股份有限公司
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Priority to US15/751,485 priority Critical patent/US10295205B2/en
Publication of WO2017045459A1 publication Critical patent/WO2017045459A1/zh

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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
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • F24F5/0021—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice using phase change material [PCM] for storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/40—Geothermal collectors operated without external energy sources, e.g. using thermosiphonic circulation or heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
    • F25B23/006—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect boiling cooling systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T2010/50—Component parts, details or accessories
    • F24T2010/56—Control arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/40—Geothermal heat-pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • the invention relates to a gravity heat pipe type cold source cold storage system and a chiller.
  • the data center has a relatively high requirement for the continuous cooling capacity of the chiller.
  • the UPS can be used for power supply of the IT equipment, and generally cannot supply power to the air conditioner with the same large power consumption, but can give the fan, Power is supplied by devices with low power consumption such as pumps.
  • the data center has added a large-scale cold storage tank in the water system, which is bulky and takes up a lot of space, which brings trouble to the heat preservation work and the load-bearing work; and the system cannot save energy. From the perspective of providing the angle of cooling after power failure and reducing the volume of the cold storage device.
  • the present invention provides an energy-saving and efficient gravity heat pipe type cold storage system for the defects of the prior art chiller.
  • the gravity heat pipe type cold source cold storage system of the present invention adopts the following technical scheme: a gravity heat pipe type cold source cold storage system, the chiller is provided with a cold water pipe, and the cold storage system includes a gravity heat pipe.
  • a cold storage tank a condensing heat exchange device and a heat exchange tube
  • the inlet and the outlet of the cold storage tank are connected in parallel with the cold water pipeline of the chiller, and are connected or disconnected through a control valve
  • the gravity heat pipe is a separate heat pipe
  • the evaporation section is disposed in the cold storage tank, and the condensation section is disposed in the condensation heat exchange device to obtain a cold source
  • the heat exchange tube is buried in the underground, the heat exchange tube includes a central tube and an outer tube, and the central tube and The upper ends of the outer tubes are respectively connected to the inlet and the outlet of the condensing heat exchange device through a heat insulating tube, the center tube and the outer tube are parallel, and the outer tube is evenly disposed outside the center tube, and the outer tubes are mutually connected
  • the cross-section of the outer tube is composed of three arcs of equal arc length and the like, and the edges of the outer tube are connected to the outer wall surface of the central tube.
  • cross-sectional areas of the outer tubes are equal.
  • the condensing heat exchange device is a water cooling device, an air cooling device or a spray evaporation condensing heat exchange device.
  • the sum of the areas of the cross sections of the outer tubes is greater than the cross sectional area of the center tubes.
  • the inner wall diameter of the central tube is 40 ⁇ 0.5 mm
  • the outer diameter of the heat exchange tube is 80 ⁇ 0.5 mm
  • the wall thickness of the central tube and the outer tube are both 3 ⁇ 0.5 mm. .
  • the inner tube of the central tube near the ground is insulated or a heat insulating sleeve is disposed on the inner wall thereof.
  • the cross-sectional area of the center tube is 50-60% of the sum of the cross-sectional areas of the outer tubes. The heat exchange efficiency is higher at this time.
  • the cold storage system is applied to a chiller, and the cold storage tank is connected in parallel with the chiller. when When the chiller fails or loses power, the cold storage tank can be used to continuously provide cooling capacity.
  • the cold storage tank stores a cold storage medium, which is water, an ethylene glycol solution, a 35% to 40% aqueous calcium chloride solution, or a sodium carbonate containing 20% to 40%.
  • a cold storage medium which is water, an ethylene glycol solution, a 35% to 40% aqueous calcium chloride solution, or a sodium carbonate containing 20% to 40%.
  • the cold storage medium has a phase transition temperature of 5 to 20 ° C, thereby effectively utilizing the latent heat of phase change in a high temperature environment.
  • the gravity heat pipe type cold source cold storage system of the present invention uses a heat exchange tube to provide a cold source for a gravity heat pipe, and the heat exchange tube can fully utilize the heat exchange area in the borehole to maintain a large area contact between the heat exchange tube and the well wall.
  • the heat absorption efficiency of the heat exchange tube is effectively improved, and at the same time, because the arc curvatures of the outer tubes are the same, the outer tube tube can be evenly distributed, preventing the outer tube from being broken and prolonging the service life of the outer tube.
  • the invention also discloses a gravity heat pipe type cold source cold storage system chiller, which adopts the gravity heat pipe type cold source cold storage system as described above, and the cold storage tank is connected in parallel with the chiller.
  • the cold storage tank is connected to the chiller through a three-way valve. This design makes it easy to control the passage of control media from a chiller or a cold storage tank.
  • the gravity heat pipe type cold source cold storage system chiller of the present invention provides a cold storage system for a chiller by using a gravity heat pipe type cold source cold storage system
  • the gravity heat pipe type cold source cold storage system of the present invention uses a heat exchange tube to provide a gravity heat pipe
  • the cold source and the heat exchange tube can make full use of the heat exchange area in the borehole, so that the heat exchange tube maintains a large area contact with the well wall, effectively improving the suction efficiency of the heat exchange tube, and at the same time, because the curvature of each arc surface of the outer tube is The same can be used to evenly distribute the outer tube to prevent the outer tube from rupturing and prolong the service life of the outer tube.
  • FIG. 1 is a schematic structural view of a gravity heat pipe type cold source cold storage system of the present invention
  • FIG. 2 is a schematic structural view of a gravity heat pipe of the present invention
  • FIG. 3 is a schematic view showing the structure of the heat exchange tube of the present invention.
  • the gravity heat pipe type cold source cold storage system of the present invention has a cold storage system applied to a chiller, and the chiller is provided with a cold water pipe, and the cold storage system includes a gravity heat pipe 6 and a cold storage tank 5 .
  • the cold storage tank 5 is connected in parallel with the chiller unit 4. When the chiller fails or is powered off, the cold storage tank 5 can be used to continuously supply the cooling capacity.
  • the inlet and outlet of the cold storage tank are connected in parallel with the cold water pipe of the chiller, and are connected or disconnected through the control valve;
  • the gravity heat pipe is a separate heat pipe, the evaporation section is set in the cold storage tank, and the condensation section is set in the condensation exchange Thermal device Obtain a cold source;
  • the heat exchange tube is buried underground.
  • the cold storage tank 5 stores a cold storage medium, which is water, an ethylene glycol solution, a 35% to 40% aqueous solution of calcium chloride, or a sodium carbonate containing 10% to 40% and 15% to 25%.
  • the cold storage medium has a phase transition temperature of 5 to 20 ° C, thereby effectively utilizing the latent heat of phase change in a high temperature environment.
  • the heat exchange tube of the present invention is buried in the ground, and includes a central tube 1 and an outer tube 2, and the upper ends of the central tube 1 and the outer tube 2 are respectively connected to the inlet and the outlet of the condensing heat exchange device 4 through a heat insulating tube to form a circulation, thereby
  • the condensing heat exchanger provides cold water as a source of condensation.
  • the central tube 1 has a circular cross section
  • the outer tube 2 is parallel to the central tube 1
  • the outer tube 2 is evenly disposed outside the center tube 1, and the outer tubes 2 are separated from each other, and the outer tube 2 has three cross sections.
  • the arcs of the arc length and the like are sequentially connected end to end, the ribs of the outer tube 2 are connected to the outer wall surface of the center tube 1, and the arc surface of the outer tube 2 away from the center tube 1 is coaxial with the center tube 1.
  • the outer tube 2 is an inflow tube, and the central tube 1 is a return tube.
  • the above design enables the heat exchange tube to fully utilize the heat exchange area in the borehole, so that the heat exchange tube maintains a large area contact with the well wall, thereby effectively improving the suction efficiency of the heat exchange tube.
  • the outer tubes 2 are separated from each other and are not in contact with each other.
  • the cross-sectional areas of the outer tubes 2 are all equal.
  • the sum of the areas of the cross sections of all the outer tubes 2 is larger than the cross sectional area of the center tubes 1.
  • This design can greatly reduce the tube pressure of the inlet pipe of the heat exchange tube. It ensures a slower flow of fluid during inflow, a longer residence time and more heat.
  • the reflux cross section is small, and the liquid passing through the bottom heat exchange can quickly flow back to the ground to prevent the return liquid from being thermally disturbed by the inlet pipe.
  • the cross-sectional area of the center tube 1 is 50-60% of the sum of the cross-sectional areas of the outer tubes 1.
  • the outer tube wall of the outer tube 2 is provided with a groove 3.
  • the groove 3 can be arranged along the axial direction of the outer tube 2. Among them, the grooves 3 are evenly distributed on the outer tube wall of the outer tube 2. The length of the groove 3 is equal to the length of the outer tube 2.
  • a groove 3 is provided on the outer tube 2 for enlarging the surface area of the outer tube 2, which can absorb heat more effectively and improve the heat exchange efficiency of the heat exchange tube.
  • the heat exchange area in the borehole can be fully utilized to maintain a large area contact between the heat exchange tube and the well wall, thereby effectively improving the heat absorption efficiency of the heat exchange tube.
  • the inner tube 1 is insulated from the inner wall of one end of the ground or a heat insulating sleeve is disposed on the inner wall thereof. Near the surface of the earth, the thermal interference between the inlet pipe and the return pipe is large, and the heat exchange efficiency can be improved by insulating the pipe contact surface of the upper end of the return pipe near the ground or inserting the heat insulating sleeve.
  • the heat exchange tube is made of high density polyethylene or polypropylene.
  • the inner wall diameter of the center tube 1 is 40 ⁇ 0.5 mm
  • the overall outer diameter of the heat transfer tube is 80 ⁇ 0.5 mm
  • the wall thickness of the center tube 1 and the outer tube 2 are both 3 ⁇ 0.5 mm.
  • the invention also discloses a gravity heat pipe type cold source cold storage system chiller, which adopts the gravity heat pipe type cold source cold storage system as described above, and the cold storage tank 5 is connected in parallel with the chiller unit.
  • the cold storage tank 5 is connected to the chiller through a three-way valve. This design makes it easy to control the passage of the control medium from the chiller or the cold storage tank.
  • the invention mainly relates to the cooling mode of the condensation section of the separated heat pipe, and the cooling section is cooled by introducing the underground cold water through the heat exchange pipe, and the structure of the heat exchange pipe is improved to improve the heat exchange efficiency.
  • the gravity heat pipe type cold source cold storage system chiller of the present invention uses a gravity heat pipe type cold source cold storage system as a chiller
  • the group provides a cold storage system
  • the gravity heat pipe type cold source cold storage system of the present invention uses a heat exchange tube to provide a cold source for the gravity heat pipe, and the heat exchange tube can fully utilize the heat exchange area in the borehole to keep the heat exchange tube and the well wall large.
  • the contact of the area effectively improves the cooling efficiency of the heat exchange tube, and at the same time, because the arcs of the arc sides of the outer tube are the same, the outer tube tube can be evenly distributed to prevent the outer tube from rupturing and prolong the service life of the outer tube.
  • Cool storage process when the temperature of the condensing heat exchanger 4 is lower than the set value, the gravity heat pipe 6 starts to operate, and the brine is circulated between the outdoor condensing heat exchange device and the cold storage tank 5, and the heat is discharged in the condensing heat exchange device 4.
  • the heat is absorbed in the cold storage tank 5, thereby lowering the temperature of the cold storage medium in the cold storage tank 5, and even causing a phase change of the refrigerant medium, thereby storing heat.
  • the process of releasing the cold amount when the cooling capacity needs to be released, the water inlet of the chiller first flows through the cold storage tank 5 by opening the on-off valve, and the water exchanges heat with the medium in the cold storage tank 5, thereby reducing the cold water.
  • the water temperature of the unit The process of releasing the cooling capacity.
  • the gravity heat pipe type 6 cold source cold storage system of the invention uses the heat exchange tube to provide a cold source for the gravity heat pipe 6, and the heat exchange tube can fully utilize the heat exchange area in the borehole to maintain a large area contact between the heat exchange tube and the well wall.
  • the efficiency of the heat absorption of the heat exchange tubes can be effectively improved, and at the same time, because the arcs of the arcs of the outer tubes are the same, the outer tube tubes can be evenly distributed to prevent the outer tubes from rupturing and prolong the service life of the outer tubes.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

一种重力热管式冷源蓄冷系统及冷水机组，蓄冷系统包括重力热管（6）、蓄冷池（5）、冷凝换热装置（4）和换热管，重力热管（6）的下端设置在蓄冷池（5）中，重力热管（6）的上端设置在冷凝换热装置（4）中，换热管埋设在地下，其包括中心管（1）和外侧管（2），中心管（1）和外侧管（2）的上端分别联通冷凝换热装置（4）的进口和出口，中心管（1）和外侧管（2）的下端彼此联通。该系统利用换热管为重力热管（6）提供冷源，有效提高换热管的吸冷效率。

Description

重力热管式冷源蓄冷系统及冷水机组 技术领域
本发明涉及一种重力热管式冷源蓄冷系统及冷水机组。
背景技术
现有技术中，数据中心对冷水机组持续制冷能力要求比较高，当外部电源断电后，UPS可以用于IT设备供电，一般无法给同样耗电巨大的空调设备进行供电，但是可以给风机、水泵等功耗小的设备进行供电。此外，数据中心为解决蓄冷事宜，在水系统中增设大型蓄冷罐，体积庞大，占据空间巨大，给保温工作，承重工作带来麻烦；并且这种系统并不能节能。出于断电后提供冷量的角度以及减少蓄冷设备体积的角度考虑。
因此，需要一种蓄冷系统以解决上述问题。
发明内容
发明目的：本发明针对现有技术中冷水机组的缺陷，提供一种节能高效的重力热管式蓄冷系统。
技术方案：为解决上述技术问题，本发明的重力热管式冷源蓄冷系统采用如下技术方案：一种重力热管式冷源蓄冷系统，所述冷水机组设有冷水管道，所述蓄冷系统包括重力热管和蓄冷池、冷凝换热装置和换热管，所述蓄冷池的进口和出口与冷水机组的冷水管道连接形成并联，并通过控制阀实现接入或断开；所述重力热管为分离式热管，其蒸发段设在蓄冷池中，冷凝段则设在冷凝换热装置中获取冷源；所述换热管埋设在地下，所述换热管包括中心管和外侧管，所述中心管和外侧管的上端分别通过绝热管联通所述冷凝换热装置的进口和出口，所述中心管和外侧管平行，所述外侧管均匀设置在所述中心管的外侧，所述外侧管之间相互分离，所述外侧管的横截面均由三个等弧长等半径的弧依次首尾相接构成，所述外侧管的棱与所述中心管的外壁表面连接，所述外侧管远离所述中心管的弧面与所述中心管同轴。
更进一步的，所述外侧管的横截面面积均相等。
更进一步的，所述冷凝换热装置为水冷装置、风冷装置或者喷淋蒸发冷凝换热装置。
更进一步的，所述外侧管的横截面的面积总和大于所述中心管的横截面面积。
更进一步的，所述中心管的内壁直径为40±0.5mm,所述换热管整体外直径为80±0.5mm，所述中心管和所述外侧管的管壁厚度均为3±0.5mm。
更进一步的，所述中心管靠近地面的一端内壁绝热或在其内壁设置绝热管套。
更进一步的，所述中心管的截面积为所述外侧管截面积之和的50-60％。此时换热效率更高。
更进一步的，所述蓄冷系统应用于冷水机组上，所述蓄冷池与所述冷水机组并联。当 冷水机组出现故障或者停电时，可以利用蓄冷池持续提供冷量。
更进一步的，所述蓄冷池中存储有蓄冷介质，所述蓄冷介质是水、乙二醇溶液、35％～40％的氯化钙水溶液、或者是含20％～40％十水合硫酸钠和15％～25％三水合醋酸钠的水溶液，或者是含20％～40％十水合硫酸钠和15％～30％氯化钙的水溶液。此蓄冷介质具有5～20℃下相变温度，从而在温度较高的环境下有效利用其相变潜热。
有益效果：本发明的重力热管式冷源蓄冷系统利用换热管为重力热管提供冷源，换热管能够充分利用钻孔井内的热交换面积，使换热管与井壁保持大面积的接触，有效提高换热管的吸冷效率，同时因为外侧管的各弧面弧度均相同可以使外侧管管压平均分配，防止外侧管破裂，延长外侧管使用寿命。
本发明还公开了一种重力热管式冷源蓄冷系统冷水机组，采用如上所述的重力热管式冷源蓄冷系统，所述蓄冷池与所述冷水机组并联。
更进一步的，所述蓄冷池通过三通阀连接冷水机组。此种设计可简单方便实现控制介质从冷水机组或者蓄冷池通过。
有益效果：本发明的重力热管式冷源蓄冷系统冷水机组，利用重力热管式冷源蓄冷系统为冷水机组提供蓄冷系统，且本发明的重力热管式冷源蓄冷系统利用换热管为重力热管提供冷源，换热管能够充分利用钻孔井内的热交换面积，使换热管与井壁保持大面积的接触，有效提高换热管的吸冷效率，同时因为外侧管的各弧面弧度均相同可以使外侧管管压平均分配，防止外侧管破裂，延长外侧管使用寿命。
附图说明
图1本发明的重力热管式冷源蓄冷系统的结构示意图；
图2本发明的重力热管的结构示意图；
图3本发明的换热管的结构示意图。
具体实施方式
下面结合附图和具体实施例，进一步阐明本发明，应理解这些实施例仅用于说明本发明而不用于限制本发明的范围，在阅读了本发明之后，本领域技术人员对本发明的各种等价形式的修改均落于本申请所附权利要求所限定的范围。
请参阅图1、图2和图3所示，本发明的重力热管式冷源蓄冷系统，蓄冷系统应用于冷水机组上，冷水机组设有冷水管道，蓄冷系统包括重力热管6、蓄冷池5、冷凝换热装置4和换热管，重力热管6的下端设置在蓄冷池5中，重力热管6的上端设置在冷凝换热装置4中。其中，蓄冷池5与冷水机组4并联。当冷水机组出现故障或者停电时，可以利用蓄冷池5持续提供冷量。
蓄冷池的进口和出口与冷水机组的冷水管道连接形成并联，并通过控制阀实现接入或断开；重力热管为分离式热管，其蒸发段设在蓄冷池中，冷凝段则设在冷凝换热装置中 获取冷源；换热管埋设在地下。
蓄冷池5中存储有蓄冷介质，所述蓄冷介质是水、乙二醇溶液、35％～40％的氯化钙水溶液、或者是含20％～40％十水合硫酸钠和15％～25％三水合醋酸钠的水溶液，或者是含20％～40％十水合硫酸钠和15％～30％氯化钙的水溶液。此蓄冷介质具有5～20℃下相变温度，从而在温度较高的环境下有效利用其相变潜热。
本发明的换热管埋设在地下，包括中心管1和外侧管2，中心管1和外侧管2的上端分别通过绝热管联通所述冷凝换热装置4的进口和出口，形成循环，从而为冷凝换热装置提供作为冷凝冷源的冷水。中心管1的横截面为圆形，外侧管2与中心管1平行，外侧管2均匀设置在中心管1的外侧，外侧管2之间相互分离，外侧管2的横截面均由三个等弧长等半径的弧依次首尾相接构成，外侧管2的棱与中心管1的外壁表面连接，外侧管2远离中心管1的弧面与中心管1同轴。其中外侧管2为进流管，中心管1为回流管。上述设计能够使换热管充分利用钻孔井内的热交换面积，使换热管与井壁保持大面积的接触，有效提高换热管的吸冷效率。本实施例中，外侧管2之间相互分离、不接触。外侧管2的横截面面积均相等。所有外侧管2的横截面的面积的总和大于中心管1的横截面面积。此设计可使换热管的进流管的管压大大降低。可保证进流时流体较缓慢流动，停留时间长，吸收更多的热量。回流截面小，经过底部热交换的液体能快速流回地面，避免回流液体受进流管的热干扰。优选的，中心管1的截面积为外侧管1截面积之和的50-60％。
优选的，外侧管2的外管壁上设置有凹槽3。凹槽3可以沿外侧管2的轴线方向设置。其中，凹槽3均匀分布在外侧管2的外管壁。凹槽3的长度与外侧管2的长度相等。在外侧管2上设置凹槽3用来扩大外侧管2的表面积，可以更有效的吸收热量，提高换热管的热交换效率。能够充分利用钻孔井内的热交换面积，使换热管与井壁保持大面积的接触，有效提高换热管的吸冷效率。中心管1靠近地面的一端内壁绝热或者在其内壁设置绝热管套。靠近地表的部分，进流管和回流管之间热干扰大，对回流管靠近地面的上端的管腔接触面绝热或插入绝热套管就可提高热交换效率。为保证使用寿命大于50年，换热管的材质为高密度聚乙烯或聚丙烯。中心管1的内壁直径为40±0.5mm,换热管的整体外直径为80±0.5mm，中心管1和外侧管2的管壁厚度均为3±0.5mm。
本发明还公开了一种重力热管式冷源蓄冷系统冷水机组，采用如上所述的重力热管式冷源蓄冷系统，蓄冷池5与冷水机组并联。蓄冷池5通过三通阀连接冷水机组。此种设计，简单方便实现控制介质从冷水机组或者蓄冷池通过。
本发明主要在于分离式热管的冷凝段的制冷方式，通过换热管引入地下冷水对冷凝段进行降温，同时该换热管的结构有改进提高了换热效率。
本发明的重力热管式冷源蓄冷系统冷水机组，利用重力热管式冷源蓄冷系统为冷水机 组提供蓄冷系统，且本发明的重力热管式冷源蓄冷系统利用换热管为重力热管提供冷源，换热管能够充分利用钻孔井内的热交换面积，使换热管与井壁保持大面积的接触，有效提高换热管的吸冷效率，同时因为外侧管的各弧面弧度均相同可以使外侧管管压平均分配，防止外侧管破裂，延长外侧管使用寿命。
原理如下：
蓄冷过程：在冷凝换热装置4温度低于设定值时，重力热管6启动运行，载冷剂在室外冷凝换热装置和蓄冷池5之间进行循环，在冷凝换热装置4中排放热量，在蓄冷池5中吸收热量，从而降低蓄冷池5中蓄冷介质的温度，甚至使得制冷剂介质发生相变，从而储存热量。
释放冷量的过程：当需要释放冷量的时候，通过开启通断阀的方式，使得冷水机组的进水先流经蓄冷池5，这些水和蓄冷池5中介质发生热量交换，降低了冷水机组的水温。实现释放冷量的过程。
本发明的重力热管6式冷源蓄冷系统利用换热管为重力热管6提供冷源，换热管能够充分利用钻孔井内的热交换面积，使换热管与井壁保持大面积的接触，有效提高换热管的吸冷效率，同时因为外侧管的各弧面弧度均相同可以使外侧管管压平均分配，防止外侧管破裂，延长外侧管使用寿命。

Claims (10)

  1. 一种重力热管式冷源蓄冷系统，所述冷水机组设有冷水管道，其特征在于：所述蓄冷系统包括重力热管(6)和蓄冷池(5)、冷凝换热装置(4)和换热管，所述蓄冷池的进口和出口与冷水机组的冷水管道连接形成并联，并通过控制阀实现接入或断开；所述重力热管为分离式热管，其蒸发段设在蓄冷池中，冷凝段则设在冷凝换热装置中获取冷源；所述换热管埋设在地下，所述换热管包括中心管(1)和外侧管(2)，所述中心管(1)和外侧管(2)的上端分别通过绝热管联通所述冷凝换热装置(4)的进口和出口，所述中心管(1)和外侧管(2)平行，所述外侧管(2)均匀设置在所述中心管(1)的外侧，所述外侧管(2)之间相互分离，所述外侧管(2)的横截面均由三个等弧长等半径的弧依次首尾相接构成，所述外侧管(2)的棱与所述中心管(1)的外壁表面连接，所述外侧管(2)远离所述中心管(1)的弧面与所述中心管(1)同轴。
  2. 如权利要求1所述的重力热管式冷源蓄冷系统，其特征在于，所述外侧管(2)的横截面面积均相等。
  3. 如权利要求1所述的重力热管式冷源蓄冷系统，其特征在于，所述冷凝换热装置为水冷装置、风冷装置或者喷淋蒸发冷凝换热装置。
  4. 如权利要求1所述的重力热管式冷源蓄冷系统，其特征在于，所述外侧管(2)的横截面的面积总和大于所述中心管(1)的横截面面积。
  5. 如权利要求1所述的重力热管式冷源蓄冷系统，其特征在于，所述中心管(1)的内壁直径为40±0.5mm,所述换热管整体外直径为80±0.5mm，所述中心管(1)和所述外侧管(2)的管壁厚度均为3±0.5mm。
  6. 如权利要求1所述的重力热管式冷源蓄冷系统，其特征在于，所述中心管(1)靠近地面的一端内壁绝热或在其内壁设置绝热管套。
  7. 如权利要求1所述的重力热管式冷源蓄冷系统，其特征在于，所述中心管(1)的截面积为所述外侧管(1)截面积之和的50-60％。
  8. 如权利要求1所述的重力热管式冷源蓄冷系统，其特征在于，所述蓄冷池(5)中存储有蓄冷介质，所述蓄冷介质是水、乙二醇溶液、35％～40％的氯化钙水溶液、或者是含20％～40％十水合硫酸钠和15％～25％三水合醋酸钠的水溶液，或者是含20％～40％十水合硫酸钠和15％～30％氯化钙的水溶液。
  9. 一种重力热管式冷源蓄冷系统冷水机组，其特征在于，包括如权利要求1-7任一项所述的重力热管式冷源蓄冷系统，所述蓄冷池(5)与冷水机组并联。
  10. 如权利要求8所述的重力热管式冷源蓄冷系统冷水机组，其特征在于，所述蓄冷池(5)通过三通阀连接冷水机组。
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