WO1989000269A1 - Auxiliaire d'economie d'energie pour appareils de climatisation - Google Patents

Auxiliaire d'economie d'energie pour appareils de climatisation Download PDF

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Publication number
WO1989000269A1
WO1989000269A1 PCT/US1987/001524 US8701524W WO8900269A1 WO 1989000269 A1 WO1989000269 A1 WO 1989000269A1 US 8701524 W US8701524 W US 8701524W WO 8900269 A1 WO8900269 A1 WO 8900269A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressor
thermostat
switch
predetermined temperature
relay
Prior art date
Application number
PCT/US1987/001524
Other languages
English (en)
Original Assignee
Dyna Flow Engineering, Inc.
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 Dyna Flow Engineering, Inc. filed Critical Dyna Flow Engineering, Inc.
Priority to PCT/US1987/001524 priority Critical patent/WO1989000269A1/fr
Publication of WO1989000269A1 publication Critical patent/WO1989000269A1/fr

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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/067—Evaporator fan units
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements

Definitions

  • the present invention relates to a cooling or refrigerating system having at least two compressors of different capacities and one evaporator, and more particularly, to such a system that regulates the air flow through the evaporator.
  • a compressor pumps a refrigerant gas under pressure to a condenser unit where heat is dissipated causing the refrigerant to liquify. After being passed through a thermostatic expansion valve or equivalent means, the refrigerant boils thereby absorbing heat (cooling) from the evaporator coils.
  • a fan is positioned in front of the evaporator and cool air is blown to the area being cooled or refrigerated.
  • the refrigerant enters the evaporator coils in liquid state and starts vaporizing as it progresses towards the low side of the evaporator.
  • the best superheat setting for an evaporator is the point at which the temperature of the thermal bulb of the thermostatic expansion valve changes the least when the system is running. This setting is called the Minimum Stable Signal (MSS) point or setting. This setting is a result of the evaporator flow, the behavior of the expansion valve and the displacement of air passed through the cooling evaporator coils.
  • the expansion valve is usually calibrated during the installation of the system. The flow characteristics and the air blown are usually constant. Therefore, for a one compressor system, an initial MSS setting is usually satisfactory until the components are worn out and the characteristics of the system change.
  • Figure 1 represents a mechanical and electrical block and schematic diagram of a cooling system, showing the main compressor active.
  • the present accessory device 10 basically comprises an auxiliary compressor 20, which is piped in parallel with main compressor C.,, power relay means 30 for auxiliary compressor
  • auxiliary time delay means 40 main time delay means 50
  • relay assembly with tandem switches 60 auxiliary thermostat means 70 and fan speed control means 80.
  • Device 10 is connected in series between conventional thermostat T formulate and power relay means R M for main compressor C...
  • Thermostat T M works as any conventional thermostat to activate the coil of relay means R M when the temperature sensed is higher than a predetermined temperature ⁇ v --_ ' When temperature T 1 is reached, the 24 volts control voltage is interrupted, deactivating the coil of relay R matter stopping compressor C Cincinnati.
  • TMGood_l. is lower than T,M,2.
  • Device 10 connects main time delay means 50 and normally open switch means 62 of tandem relay assembly 60 in series between thermostat M and the coil hot input of power relay ?. so that when thermostat senses a temperature above T réelle the 24 volts are applied to the coil of relay 60 causing switch means 62 to close.
  • Main time delay means 50 allows the pressures in the low and high ports of conventional compressor C M to equalize before activating compressor C .
  • switch means 62 opens because the coil of relay means 60 is de-energized and compressor C M stops. At this time, switch means 64 in relay means 60 closes.
  • the temperature setting for thermostat means 70 is such that the 24 volts control voltage is applied to switch means 6.4 when the temperature is above T A _ which is set in the preferred embodiment to be equal to T _.. ⁇ A , which is the temperature at which auxiliary compressor 20 cuts in is set at a temperature higher or equal to T - and greater than T 0 .
  • T ⁇ . is the temperature at which the auxiliary compressor stops, and may be set at T _. or lower since it will probably never reached the low temperature T , but only try to maintain it.
  • the idea being to select an auxiliary compressor 20 capacity sufficiently low to merely compensate for heat losses rather than having the capability of bringing the temperature down. This delays the time for the main compressor C M to cut in, thereby saving electricity.
  • T A,.l. should not be set too much hig ⁇ 3 her than TM.,l., because the lower capacity auxiliary compressor means 20 may not be able to overcome the heat loss in the system if it is allowed to build up.
  • Auxiliary means 20 acts like an overdrive in an automobile, if an analogy is to be made. For example, if T _. is set to 70°F, T M,,2,, is 80°F, TA_l., ma"- be 70°F and A,2gon mav be set to 75°F then the system will use main compressor C to bring the temperature down to T or 70°F. At that point, thermostat T., disconnects the 24 volt from the coil of relay
  • Thermostat 70 is not activated because the temperature is lower than T..,, or 75°F.
  • the temperature starts rising and when it reaches 75°F, compressor 70 cut in.
  • the action is not immediate because time delay means 40 will make it wait a sufficient amount of time to allow the pressures or. the high and low side to equalize thereby reducing the initial load on the auxiliary compressor 20.
  • Compressor 20 cuts in and having a capacity lower (preferably one-half) than compressor C and it will try to maintain the temperature within the 70° F to 75°F by primarily overcoming the thermal leaks of the space being cooled or refrigerated. Of course, if the leaks are substantial or the ambient temperature outside is considerably higher, the temperature will increase to 80°F which causes thermostat T M., to close. This in turn activates the coil of relay means 60 thereby opening switching means 64 and closing switch means 62. Compressor C M is then activated after a sufficient time delay to, again, equalize the pressures.
  • This system saves energy because a high capacity compressor is used to lower the temperature to a point where a low capacity (consumes less energy) auxiliary compressor 20 takes over.
  • a low capacity (consumes less energy) auxiliary compressor 20 takes over.
  • the present invention compensates this by changing the speed of the fan or blower used with the evaporator so that "starved” or "flooded” conditions are avoided as much as possible.
  • fan relay means 80 includes one-pole double throw switch means 82 that provide a selection of one of two voltages, V_ J__ and V foruml to variable speed fan member F.
  • switch means 64 compressor 70 is about to cut in after the required time delay
  • the coil of fan relay means 80 is energized causing the speed of fan F to change.
  • Fan relay means 80 can only select between two voltages, and consequently, only two fan speeds are possible with the device disclosed here. But if more than one auxiliary compressors are used, then it is possible to have one fan speed for each compressor, or compressor combination, that will be proportional to its capacity or the capacity of the combination.
  • a lower speed is used for a lower capacity rated compressor, or compressor combination, so that less heat is absorbed by the evaporator when less air is passed through. This tends to compensate the shift of the superheat setting away from the MSS point.
  • the control signals activating the different compressors would be detected and a proportional voltage would be applied to a variable speed evaporator fan F. Therefore, if there are four possible compressor capacity combinations, then there would be four voltages available to fan F with four different speeds.
  • the control apparatus disclosed in U.S. patent No. 4,535,602 which is hereby incorporated by reference, illustrates one manner of energizing different combinations of compressors of different capacities and the outputs of the capacity selector 10 in that U.S. patent may be used to provide a proportional voltage to the evaporator fan F, as discussed, to maintain the system as close to the MSS setting as possible.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

Dispositif auxiliaire (10) pour systèmes de réfrigération classiques comprenant un compresseur auxiliaire (20) de capacité plus faible à tube parallèle au compresseur CM du système classique. Le compresseur auxiliaire (20) intervient après qu'une certaine température ait été atteinte et automatiquement la vitesse du ventilateur est diminuée pour compenser la capacité plus faible du système. Chacun des compresseurs CM comprend des temporisations (50) afin de permettre l'égalisation des ouvertures à haute et basse pression.
PCT/US1987/001524 1987-07-01 1987-07-01 Auxiliaire d'economie d'energie pour appareils de climatisation WO1989000269A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1987/001524 WO1989000269A1 (fr) 1987-07-01 1987-07-01 Auxiliaire d'economie d'energie pour appareils de climatisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1987/001524 WO1989000269A1 (fr) 1987-07-01 1987-07-01 Auxiliaire d'economie d'energie pour appareils de climatisation

Publications (1)

Publication Number Publication Date
WO1989000269A1 true WO1989000269A1 (fr) 1989-01-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1987/001524 WO1989000269A1 (fr) 1987-07-01 1987-07-01 Auxiliaire d'economie d'energie pour appareils de climatisation

Country Status (1)

Country Link
WO (1) WO1989000269A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11925006B2 (en) 2020-04-09 2024-03-05 Vertiv Corporation Cooling system with continuously variable capacity

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091563A (en) * 1936-03-13 1937-08-31 B F Sturtevant Company Inc Air conditioning system utilizing refrigeration
US3127754A (en) * 1962-10-04 1964-04-07 Honeywell Regulator Co Refrigeration control apparatus with time delay means
US3422633A (en) * 1966-06-13 1969-01-21 Motor Wheel Corp Delayed restarting circuit for compressor motor
US3434028A (en) * 1966-07-14 1969-03-18 Lennox Ind Inc Compressor motor time delay circuit
US4257238A (en) * 1979-09-28 1981-03-24 Borg-Warner Corporation Microcomputer control for an inverter-driven heat pump
US4270362A (en) * 1977-04-29 1981-06-02 Liebert Corporation Control system for an air conditioning system having supplementary, ambient derived cooling
US4384462A (en) * 1980-11-20 1983-05-24 Friedrich Air Conditioning & Refrigeration Co. Multiple compressor refrigeration system and controller thereof
US4535602A (en) * 1983-10-12 1985-08-20 Richard H. Alsenz Shift logic control apparatus for unequal capacity compressors in a refrigeration system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091563A (en) * 1936-03-13 1937-08-31 B F Sturtevant Company Inc Air conditioning system utilizing refrigeration
US3127754A (en) * 1962-10-04 1964-04-07 Honeywell Regulator Co Refrigeration control apparatus with time delay means
US3422633A (en) * 1966-06-13 1969-01-21 Motor Wheel Corp Delayed restarting circuit for compressor motor
US3434028A (en) * 1966-07-14 1969-03-18 Lennox Ind Inc Compressor motor time delay circuit
US4270362A (en) * 1977-04-29 1981-06-02 Liebert Corporation Control system for an air conditioning system having supplementary, ambient derived cooling
US4257238A (en) * 1979-09-28 1981-03-24 Borg-Warner Corporation Microcomputer control for an inverter-driven heat pump
US4384462A (en) * 1980-11-20 1983-05-24 Friedrich Air Conditioning & Refrigeration Co. Multiple compressor refrigeration system and controller thereof
US4535602A (en) * 1983-10-12 1985-08-20 Richard H. Alsenz Shift logic control apparatus for unequal capacity compressors in a refrigeration system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11925006B2 (en) 2020-04-09 2024-03-05 Vertiv Corporation Cooling system with continuously variable capacity

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