WO2020171778A1 - Réfrigérant amélioré et son procédé d'utilisation - Google Patents

Réfrigérant amélioré et son procédé d'utilisation Download PDF

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Publication number
WO2020171778A1
WO2020171778A1 PCT/SG2020/050084 SG2020050084W WO2020171778A1 WO 2020171778 A1 WO2020171778 A1 WO 2020171778A1 SG 2020050084 W SG2020050084 W SG 2020050084W WO 2020171778 A1 WO2020171778 A1 WO 2020171778A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
outlet
mode
chamber
inlet
Prior art date
Application number
PCT/SG2020/050084
Other languages
English (en)
Inventor
Yang Kwang FOO
Maung Than TIN
Original Assignee
Sp Innovation Pte. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sp Innovation Pte. Ltd. filed Critical Sp Innovation Pte. Ltd.
Priority to CN202080030078.1A priority Critical patent/CN113811728A/zh
Priority to SG11202108965XA priority patent/SG11202108965XA/en
Publication of WO2020171778A1 publication Critical patent/WO2020171778A1/fr

Links

Classifications

    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • F24F5/0003—Exclusively-fluid systems
    • 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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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

Definitions

  • the invention relates to the chilling of water for a district cooling system, or other such application where the provision of chilled water is required.
  • Chiller design involves the balance between energy usage, maximisation of chilled water supply and foot print of the chiller, particularly where space is critical.
  • Chillers require a substantial amount of energy, for both the application of cold energy to the water passing through, as well as the actual pumping costs for high volumes.
  • the invention provides a system for chilling a supply of water, the system comprising; a chilling chamber with at least two portions in selective fluid communication; an inlet for receiving a water supply and directing said water supply into a first end of a first of said portions; a two way conduit assembly for selectively operating as an inlet, arranged to receive the water supply and directing said water supply into a first end of a second of said portions, or operating as an outlet arranged to direct flow from the first end of the second of said portions; a selectively operable outlet arranged to direct flow from a second end of the chamber; wherein the two portions are in fluid communication proximate to the second end of the chamber, and the system is arranged to selectively operate in at least two modes; a second mode having the outlet closed and the two way conduit assembly arranged to drain water from the first end of the second portion, such that water flows from the first portion inlet into the first end of first portion to the first end of the second portion, and is drained by the two way conduit assembly,
  • the invention provides a method for chilling a supply of water, the method comprising the steps of; providing a chilling chamber with at least two portions in selective fluid communication, said chamber including an inlet and an outlet; a two way conduit assembly for selectively operating as an inlet or operating as an outlet; wherein the two portions are in fluid communication proximate to a second end of the chamber, and the system is arranged to selectively operate in at least two modes; selecting a second mode, including closing the outlet, and so, flowing water from the first inlet into a first end of first portion to a first end of the second portion, and draining the water through the two way conduit assembly, or; selecting a first mode, including opening the outlet, and so, flowing water from the first inlet into the first end of the first portion and flowing water from the two way conduit assembly into the first end of the second portion, so as to drain water from the outlet from the second end of the chamber.
  • the invention provides a system for chilling water, the system comprising: a chamber for receiving a supply of water, said chamber arranged to chill said water and then release said chilled water; wherein the chamber is selectively convertible from a first mode to a second mode, such that; in the first mode, the chamber is arranged such that the inlet flow rate is higher than an inlet flow rate in the second mode; the chamber arranged to output said water through a first outlet in the first mode, and through a second outlet in the second mode.
  • the chiller system according to the present invention may operate more efficiently in both high and low demand periods as compared to prior art systems.
  • FIG. 1 A to 1C are schematic views of a chiller system according to one embodiment of the present invention.
  • Figure 2A to 2B are isometric views of a chiller system according to a further embodiment of the present invention.
  • FIGS 1 A to 1C show schematic views of a chiller system according to the present invention.
  • This schematic arrangement excludes the necessary ancillary features that an actual system will have in place, and so only show those features that are required by the system.
  • An actual system for instance, may have an evaporator, as the chilling chamber, and a condenser unit. Pipe work connecting the supply flow to the chamber and for draining the chilling chamber have been excluded, as too have the necessary valves to make the components“selectively operable”.
  • Figure 1 A shows a chilling system 5 in a basic form.
  • the system 5 includes a chilling chamber 10, being internally divided into a first portion 25 and a second portion 30.
  • the two portions 25, 30 are in fluid communication 20, which may be a simple void, or selectively openable orifice. Selectively openable may be through operator control or automatic control. It may also be pressure driven such as being arranged to open when a differential pressure exists across the orifice. As will be explained later, in a one-pass mode flow, pressure will be substantially the same across the orifice, whereas with the outlet 45 closed, the two-pass mode will create a positive pressure in the first portion 25 compared to the second portion 30, causing the orifice to open.
  • the chamber 10 includes a selectively operable outlet 45 at a second end of the portions 25, 30.
  • an inlet 35 At the first end of the first portion 25 is an inlet 35, through which the chamber 10 receives an inflow of fluid.
  • the inflow may be return chilled water, which requires cooling in order to re-enter a district cooling system.
  • An important feature of the present invention is the use of a two-way conduit 40 which is selectively operable to act as either an inlet or an outlet. As mentioned for the orifice for the portions, switching between an outlet and an inlet for the two-way conduit assembly may be through operator control, automatic control or by a pressure driven arrangement.
  • the two-way conduit assembly 40 may be a single pipe having a valve set, with the conduit switching directions between inlet and outlet depending upon whether the system is in a one-pass mode or two-pass mode.
  • the conduit assembly 40 may be two separate pipes, with one as a dedicated inlet and the other as a dedicated outlet, with the system changing pipes on switching modes.
  • Figures IB and 1C act as illustrative examples of how the system 5 switches from a one-pass mode to a two-pass mode.
  • peak demand for chilled water may vary throughout the day, and throughout the year, subject to the end users requirements.
  • One such requirement may require higher volumes of chilled water for residential use during the evening when the end users are at home.
  • ensuring the outgoing temperature corresponds to the design temperature may be preferable.
  • the system according to the present invention is capable of selecting: i) One-Pass mode (as shown in Figure 1C): Higher flow capacity is achieved by the inflow passing through both portions in parallel, thus doubling the flow capacity; ii) Two-Pass mode (as shown in Figure IB): A greater temperature differential is achieved by having the water pass through the first portion, then returning through the second portion, and thus doubling the residence time increasing the temperature differential.
  • the outlet 45 is closed and the two-way conduit 40 switched to an outlet.
  • the inlet 35 receives an inflow 55 and directs this into the first end of the first portion 25.
  • the water flows through the first portion 25, through the fluid communication device 20 and down the second portion 30 to the first end.
  • the two-way conduit 40 acting as an outlet, directs the water flow 65 out of the second portion 30.
  • water 60 passing through the chamber 10 effectively travels two lengths of the chamber, doubling the residence time.
  • the outlet 45 is opened, and the two-way conduit 40 switched to an inlet. Both the inlet 35 and the two-way conduit 40 direct water 70, 75 into the first end of the first and second portions 25, 30, which flow towards the second end, and are directed out 85 of the chamber 10 through the outlet 45.
  • the water 80 passing through the chamber travels one length of the chamber, but the volume of water is twice that of the two-pass mode, doubling the flow rate capacity.
  • Figures 2A and 2B show an implemented system adopting the present invention according to a further embodiment of the present invention.
  • a chilled water system 95 is shown having an evaporator 105 and condenser 100.
  • the evaporator 105 is split into a first portion 120 and a second portion 115.
  • a manifold At a second end of the evaporator 105 is a manifold into which flows water from the two portions 115, 120, which allows water to flow from one portion into the other.
  • the manifold 130 includes an outlet 135.
  • an inlet 140 which receives return chilled water 170 via a pump 180, directing the return chilled water into the first portion 120 at a first end.
  • a two-way conduit assembly 145 is provided at a first end of the second portion 115, with the direction of flow determined by a first valve 157 isolating the two-way conduit from the outflow and a second valve 147 isolating the two-way conduit 145 from the inlet pump 180.
  • Figure 2A shows the outlet isolated, and so effectively closed, by a third valve 153 separating the outflow pipe 155 from the outlet pipe 150.
  • the second valve 147 is closed isolating the second portion from the inflow, and the first valve 157 opened placing the two-way conduit 145 in fluid communication with the chilled water supply 160.
  • a by-pass line 165 acts to re-direct excess flow back to the chilled water return, to be pumped back into the evaporator 105.
  • Figure 2B shows the third valve 153 opened, opening the outlet 135.
  • the second valve 147 is also opened, providing fluid communication between the pump 180 and the two-way valve 145.
  • the first valve 157 is then closed shutting off the two-way conduit 145 from the outflow. Consequently, the inflow from the chilled water return is directed into the evaporator 105 through both the inlet 140 and the two-way conduit 145.
  • water passes into the first and second portions 115, 120 simultaneously, and are extracted through the manifold 130 and outlet 135, to be directed to the chilled water supply 160.
  • the present invention improves on the prior art in that it provides the flexibility to switch between high flow rate capacity, or high residence time for chilling, subject to demand requirements.
  • the use of the present invention may reduce the necessity for multiple redundant chillers.
  • the present invention may operate in two modes and supply two different designated temperature differentials (delta) chilled water respectively. That is, if there is a need for two backup chillers in order to supply chilled water at two different temperatures, having two temperature differentials, then the present invention may replace the need for separate chillers with only one, using with the present chiller invention, thereby, reducing capital expenditure and maintenance expenses.
  • the present chiller may be used to provide chilled water to air cooling system which include chilled beams.
  • the chilled beam typically comprises a fin-and-tube heat exchanger, contained in a housing that is suspended from, or recessed in, a ceiling or mounted in the wall. Chilled water passes through the tubes to remove certain sensible cooling load in the room. Meanwhile, an air- conditioning system may still need conventional ACMV to remove the residual sensible load and latent cooling load in the building.
  • the chilled water supply temperature in a chilled beam may be higher than 13.4°C (Dew point temperature at room temperature 25°C, Relative humanity 55%) which can avoid condensation happening on the pipes connected to each chilled beam and chilled beam surfaces during operation.
  • a chilled beam is not applicable to a closed environment such as corridors and lobby, which still need conventional ACMV such as AHU/FCU, in which chilled water supply temperature is below 8°C. Accordingly, the whole chiller plant configuration may have two temperature chillers to supply chilled water and each type shall have their own back up chiller respectively. The installation expenditure and maintenance expense will increase
  • the present chiller may save installation capex and operation maintenance expense due to the one present chiller can standby for two type of chillers alternatively.
  • the present chiller may work at two pass mode with lower flow rate when it is to provide cold water with larger temperature differential and work at one pass mode with higher flow rate when it is to provide warm water with smaller temperature differential.
  • the embodiments of Figures 2B and 2A may be operated so as to operate in a one mode at a higher flow rate with lower DT (4.5°C-10°C), and another operation mode at a lower flow rate with higher DT (4.5°C -13°C).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

L'invention concerne un système de réfrigération d'eau, le système comprenant une chambre pour recevoir une alimentation en eau par l'intermédiaire d'une entrée, ladite chambre étant conçue pour réfrigérer ladite eau et ensuite libérer ladite eau réfrigérée par l'intermédiaire d'une sortie sélectivement opérationnelle. La chambre comprend en outre un ensemble conduit à deux voies pour fonctionner de façon sélective en tant qu'entrée dans un premier mode dans lequel ladite sortie sélectivement opérationnelle est ouverte, ou pour fonctionner en tant que sortie dans un second mode dans lequel ladite sortie sélectivement opérationnelle est fermée. En ayant un ensemble conduit à deux voies appliqué à une chambre de réfrigération, et une entrée et une sortie sélectivement opérationnelles, l'aptitude à commuter entre un mode de passage et deux modes de passage, permet au système de fournir des exigences de débits tout en équilibrant les cibles de température de l'eau réfrigérée.
PCT/SG2020/050084 2019-02-20 2020-02-20 Réfrigérant amélioré et son procédé d'utilisation WO2020171778A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080030078.1A CN113811728A (zh) 2019-02-20 2020-02-20 改进的激冷器及使用方法
SG11202108965XA SG11202108965XA (en) 2019-02-20 2020-02-20 Improved chiller and method of use

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG10201901480RA SG10201901480RA (en) 2019-02-20 2019-02-20 Improved chiller and method of use
SG10201901480R 2019-02-20

Publications (1)

Publication Number Publication Date
WO2020171778A1 true WO2020171778A1 (fr) 2020-08-27

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ID=72145154

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2020/050084 WO2020171778A1 (fr) 2019-02-20 2020-02-20 Réfrigérant amélioré et son procédé d'utilisation

Country Status (3)

Country Link
CN (1) CN113811728A (fr)
SG (2) SG10201901480RA (fr)
WO (1) WO2020171778A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6015453A (en) * 1997-03-04 2000-01-18 Frigoscandia Equipment Ab Refrigeration system and a separator therefor
JP2001132988A (ja) * 1999-11-05 2001-05-18 Mitsubishi Heavy Ind Ltd 氷濃度調整装置およびこれを備えた氷水搬送冷却システム
KR20020059928A (ko) * 2001-01-09 2002-07-16 김춘성 냉난방 장치
CN106015189A (zh) * 2016-06-30 2016-10-12 江苏金荣森制冷科技有限公司 加热型工业液压油制冷机用于设备热源的降温方法
CN106839054A (zh) * 2017-03-07 2017-06-13 赫普热力发展有限公司 固体蓄热电锅炉和跨季节自然水体结合的蓄热调峰系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102589340A (zh) * 2012-03-13 2012-07-18 华东建筑设计研究院有限公司 一种可变流程运行壳管式换热器端盖
CN202547474U (zh) * 2012-03-13 2012-11-21 华东建筑设计研究院有限公司 一种可变流程运行壳管式换热器端盖
CN103471292B (zh) * 2013-09-27 2015-06-17 南京金典制冷实业有限公司 一种壳程侧可变流程的管壳式换热器及其运行方法
CN205403256U (zh) * 2016-02-23 2016-07-27 山东富特能源管理股份有限公司 一种双工况蒸发器
CN105650949A (zh) * 2016-02-23 2016-06-08 山东富特能源管理股份有限公司 一种双工况蒸发器控制方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6015453A (en) * 1997-03-04 2000-01-18 Frigoscandia Equipment Ab Refrigeration system and a separator therefor
JP2001132988A (ja) * 1999-11-05 2001-05-18 Mitsubishi Heavy Ind Ltd 氷濃度調整装置およびこれを備えた氷水搬送冷却システム
KR20020059928A (ko) * 2001-01-09 2002-07-16 김춘성 냉난방 장치
CN106015189A (zh) * 2016-06-30 2016-10-12 江苏金荣森制冷科技有限公司 加热型工业液压油制冷机用于设备热源的降温方法
CN106839054A (zh) * 2017-03-07 2017-06-13 赫普热力发展有限公司 固体蓄热电锅炉和跨季节自然水体结合的蓄热调峰系统

Also Published As

Publication number Publication date
CN113811728A (zh) 2021-12-17
SG11202108965XA (en) 2021-09-29
SG10201901480RA (en) 2020-09-29

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