CN101248319A - System reheating control using width pulse modulation - Google Patents

System reheating control using width pulse modulation Download PDF

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Publication number
CN101248319A
CN101248319A CNA2005800513711A CN200580051371A CN101248319A CN 101248319 A CN101248319 A CN 101248319A CN A2005800513711 A CNA2005800513711 A CN A2005800513711A CN 200580051371 A CN200580051371 A CN 200580051371A CN 101248319 A CN101248319 A CN 101248319A
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CN
China
Prior art keywords
valve
producing medium
condenser
reheat loop
refrigeration system
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Legal status (The legal status 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 status listed.)
Pending
Application number
CNA2005800513711A
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Chinese (zh)
Inventor
M·F·塔拉斯
A·利夫森
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Carrier Corp
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Carrier Corp
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Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Publication of CN101248319A publication Critical patent/CN101248319A/en
Pending legal-status Critical Current

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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
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/153—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with subsequent heating, i.e. with the air, given the required humidity in the central station, passing a heating element to achieve the required temperature
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0403—Refrigeration circuit bypassing means for the condenser
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2521—On-off valves controlled by pulse signals

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

Abstract

A refrigerant system is provided with a reheat circuit. A pulse width modulation control is provided to achieve variable reheat capacity and thus to satisfy a wide spectrum of temperature and humidity levels in an environment conditioned by a refrigerant system. The pulse width modulation signal provided for the reheat flow control device achieves incremental amounts of reheat while avoiding temperature and humidity variations in the conditioned space.

Description

Utilize system's thermal control again of pulsewidth modulation
Technical field
The present invention relates to a kind of PDM keyer, can provide the power of heat energy again (reheat capacity) continuous or accurate stepping to refrigeration system.
Background technology
Refrigeration system has purposes widely, for example is used to regulate environment.Air-conditioning and heat pump are used for freezing and/or heating the air that enters environment.The refrigeration of environment or heating load can be because ambient environmental conditions change, and temperature that also can require because of the environment occupant and/or humidity level's variation and changing.Obviously, the operation of refrigeration system and control must reflect fully that these change to keep stable temperature and humidity condition in environment.
In some cases, when system moved under refrigeration mode, for comfortable environment is provided in conditioned space, the temperature of indoor air stream may need to be higher than the temperature that the ideal humidity level can be provided.On the other hand, by reducing the temperature of air stream, more moisture can shift out from air.These contradictions have brought challenge for the designers of refrigeration system.A kind of method that solves this challenge is the various employings of the utilization patterns of hot coil again.As a rule, hot coil is disposed in the room air flow path in evaporimeter downstream again, is in order to be used for heating in evaporimeter cooling and to have shifted out the air that is supplied to conditioned space behind the moisture at this place.
In existing technology, controller is programmed optionally to carry out hot merit energy again.But the ability that is provided by reheat loop is to increase in the stage or reduce.Expectation be the power of heat energy again that between these discrete stages, can provide variable and total systematic function.
Although can provide PDM keyer according to different purposes in refrigeration system, PDM keyer is not used to provide the power of heat energy again of phase change.
Summary of the invention
In embodiment disclosed by the invention, provide pulse width modulation controlled so that the ability that provides by reheat loop optionally to be provided, thereby change the performance of whole system.The time interval of " opening/closing " circulation is optionally, to such an extent as to system's thermal inertia is negligible to the entire effect of system on about external operational characteristics.That is to say that the occupant of air conditioner surroundings will not can be appreciated that the cold-producing medium stream that flows to reheat loop is by regular opening and closing.
In different embodiment, operation control to be changing the width of pulse, thereby is fluid control device acquisition desired interval, and for example, this fluid control device is to be opened directs refrigerant to the valve of heat-heat exchanger again.In this way, can have the power of heat energy again of wide region, and variable thermal control again can be provided.
In special pattern, the present invention also provides a loop, and this loop makes the refrigerant bypass around the condenser, thereby the operation that hot merit can and be controlled is more flexible.
These and other features that description by subsequently and accompanying drawing can better understand the present invention are brief description of the drawings below.
Description of drawings
Fig. 1 represents first schematic diagram.
Fig. 2 represents second schematic diagram.
The specific embodiment
Refrigeration system 20 as shown in Figure 1 comprises compressor 22, and its compressed refrigerant also sends it to the condenser 24 in downstream.Fan 25 makes wind cross condenser 24.Flow through condenser 24 of cold-producing medium arrives the expansion gear 26 in downstreams, passes through evaporimeter 28 then, gets back to compressor 22 at last.As shown in the figure, triple valve 30 is on the refrigerant discharge leader road between compressor 22 and the condenser 24.Based on certain purpose, triple valve 30 is by controller 38 controls, and this purpose will be described below.When triple valve was opened, cold-producing medium passed through heat-heat exchanger 34 and switch valve 35 again, and home position 31 then, and position 31 still is positioned at the upstream of condenser 24.Be known that fan 36 makes wind pervaporation device 28, heat-heat exchanger 34 is arranged to be located in the air flow path behind the evaporimeter 28 again.
Heat-heat exchanger 34 is to be cooled to uniform temperature for the air that allows evaporimeter 28 will flow through wherein again, this temperature is lower than temperature environment occupant's expectation and that require by self-operated thermostatic controller 32, thereby the moisture of capacity is shifted out and keeps in environment the humidity level of expectation from air.The Cryogenic air of evaporimeter 28 of flowing through causes more moisture to shift out from air.Air passes through heat-heat exchanger 34 more then, and is reheated to desired temperatures.In this way, the utilization of reheat loop provides desired temperatures level and humidity level for air conditioner surroundings.
Controller 38 sends to valve 30 with pulse-width signal.Valve 30 is triple valves, it typically is positioned at common open position (at the refrigerating mode run duration) so that the cold-producing medium that comes out from compressor 22 directly reaches condenser 24, valve 30 also switches to alternate position (at heat pattern run duration again), when this position, valve 30 flows through the cold-producing medium that comes out from compressor 22 to reach condenser 24 behind the heat-heat exchanger 34 again.When the pulse-width signal that is sent by controller 38 reached valve 30, this pulse-width signal switched to this alternate position with valve.Since the power of heat energy again of controller 38 decision expectation, controller just can determine the width of pulse and send to time interval between the pulse of valve 30 so, thereby valve 30 can accurately be positioned at the open position certain hour, so that the power of heat energy again of expectation to be provided.By this way, the most suitable power of heat energy again is provided, and the temperature and humidity in the air conditioner surroundings is accurately controlled.Like this, the invention provides a kind of relatively cheap and effective method, this method provides has infinite the variable energy of hot merit again in hot stage more in essence.
Fig. 2 has shown another embodiment 37, and it is similar with embodiment shown in Figure 1, and still, it does not have triple valve, but controls traditional ON/OFF magnetic valve 38 and 40 by pulse-width signal.When hot branch road worked again, valve 40 was opened, and cold-producing medium is from putting 100 shuntings and getting back to the point 102 of major loop.Pulsewidth modulation is by being similar to the method control of describing among Fig. 1 embodiment.
Be similar to the triple valve 30 among Fig. 1, valve 40 can be opened and closed to obtain the variable power of heat energy again.Valve 38 also can be operated by pulse-width signal, and can control the cold-producing medium stream in the main refrigerant circuit that is connected with valve 40.
Fig. 2 also schematically provides a selection, and it comprises condenser bypass pipeline 42, and this bypass line passes through by-passing valve 44 so that at least a portion cold-producing medium around the condenser 24 transmits according to a certain path.When needing to cool off air hardly when the needs dehumidifying, by-passing valve 44 works.The operation of by-passing valve 44 and control are the state of the art, but, condenser bypass function also can be by the pulse-width signal operation that is attended by variable pulse modulation control, this variable pulse modulation control is used for reheat loop itself, therefore, condenser bypass function provides more flexibility with the accurate parameter (aspect temperature and humidity) that obtains expectation in the environment of being regulated in refrigeration system 37 in operation.
Obviously, embodiment illustrated in figures 1 and 2 can dispose triple valve or a pair of magnetic valve.And, although only disclose two hot again forms,, any known heat pattern more all can be benefited from the present invention.
Pulse width modulation controlled is known, and the valve of being operated by pulse-width signal also is known.But the present invention has used prior art with unique mode, thereby has reached above-mentioned purpose and benefit.
Although the invention discloses preferred embodiment, those of ordinary skill in the art will appreciate that the modification that can carry out within the scope of the present invention to a certain degree.Based on above reason, claim subsequently should determine protection domain and the content that the present invention is real.

Claims (17)

1. refrigeration system comprises:
Compressor is positioned at the condenser in described compressor downstream, is positioned at the expansion gear in described condenser downstream, and the evaporimeter that is positioned at described expansion gear downstream,
Reheat loop, described reheat loop optionally receives cold-producing medium by heat-heat exchanger again, and air movement device, described air movement device make air pass through described evaporimeter and described heat-heat exchanger again,
Controller, described controller optionally operates valve system so that cold-producing medium passes through described heat-heat exchanger again, and described controller can be operated and use pulse-width signal, thereby operate described valve system to obtain temperature and humidity control level, described temperature and humidity control level is being moved the control level that described reheat loop arrived continuously and is not being moved described reheat loop between the control level that is arrived.
2. refrigeration system as claimed in claim 1 is characterized in that, described reheat loop receives cold-producing medium with the form with respect to described condenser series flow.
3. refrigeration system as claimed in claim 2 is characterized in that, described reheat loop receives cold-producing medium from the position of the upstream of described condenser.
4. refrigeration system as claimed in claim 2 is characterized in that, described reheat loop receives cold-producing medium from the position in the downstream of described condenser.
5. refrigeration system as claimed in claim 1 is characterized in that, bypass is provided, thus at least a portion cold-producing medium optionally around the described condenser of bypass.
6. refrigeration system as claimed in claim 5 is characterized in that described bypass is controlled by pulse width modulated valve.
7. refrigeration system as claimed in claim 1 is characterized in that described reheat loop is controlled by triple valve.
8. refrigeration system as claimed in claim 1 is characterized in that described valve system comprises at least one valve.
9. refrigeration system as claimed in claim 8 is characterized in that, described at least one valve is a triple valve.
10. a method of controlling refrigeration system comprises the steps:
(1) provide compressor, be positioned at described compressor downstream condenser, be positioned at described condenser downstream expansion gear, be positioned at described expansion gear downstream evaporimeter, receive the reheat loop of cold-producing medium and make air by heat-heat exchanger selectivity again by the described evaporimeter and the air movement device of heat-heat exchanger again; And
(2) by optionally moving described reheat loop so that cold-producing medium moves described refrigeration system by described heat-heat exchanger again, operation control is operated valve system to use described pulse-width signal, thereby makes cold-producing medium directly enter described reheat loop to provide in the temperature and humidity control level of moving described reheat loop and not moving described reheat loop between the discontinuous level that is provided.
11. method as claimed in claim 10 also comprises the steps: to come the optionally described condenser of bypass by transmit described condenser at least a portion cold-producing medium on every side according to a certain path.
12. method as claimed in claim 11 is characterized in that, described bypass is controlled by pulse width modulated valve.
13. method as claimed in claim 10 is characterized in that, described reheat loop receives cold-producing medium with the form with respect to described condenser series flow.
14. method as claimed in claim 13 is characterized in that, described reheat loop receives cold-producing medium from the position of the upstream of described condenser.
15. method as claimed in claim 13 is characterized in that, described reheat loop receives cold-producing medium from the position in the downstream of described condenser.
16. method as claimed in claim 10 is characterized in that, described valve system comprises at least one valve.
17. method as claimed in claim 16 is characterized in that, described at least one valve is a triple valve.
CNA2005800513711A 2005-08-23 2005-08-23 System reheating control using width pulse modulation Pending CN101248319A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/030603 WO2007024237A1 (en) 2005-08-23 2005-08-23 System reheat control by pulse width modulation

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CN101248319A true CN101248319A (en) 2008-08-20

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US (1) US20080196426A1 (en)
EP (1) EP1938026A4 (en)
CN (1) CN101248319A (en)
CA (1) CA2616279A1 (en)
WO (1) WO2007024237A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997517A (en) * 2011-09-09 2013-03-27 珠海格力电器股份有限公司 Constant temperature dehumidification system of air conditioner
CN103791652A (en) * 2014-01-13 2014-05-14 浙江理工大学 Double-heat-source heat pump system
CN106500378A (en) * 2016-09-29 2017-03-15 同济大学 Based on the efficient air conditioning unit and control method that high temperature refrigerant mixes again heat pattern
CN109564035A (en) * 2016-07-25 2019-04-02 开利公司 Dehumidification system for heat pump

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ES2318997B1 (en) * 2006-10-17 2010-03-01 Merak Sistemas Integrados De Climatizacion, S.A. AIR-CONDITIONING SYSTEM.
WO2009151830A1 (en) * 2008-06-13 2009-12-17 Carrier Corporation Start-up procedure for refrigerant systems having microchannel condenser and reheat cycle
JP2015129625A (en) * 2013-12-02 2015-07-16 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． Cooling device

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997517A (en) * 2011-09-09 2013-03-27 珠海格力电器股份有限公司 Constant temperature dehumidification system of air conditioner
CN103791652A (en) * 2014-01-13 2014-05-14 浙江理工大学 Double-heat-source heat pump system
CN103791652B (en) * 2014-01-13 2016-01-20 浙江理工大学 A kind of two temperature-heat-source heat pump
CN109564035A (en) * 2016-07-25 2019-04-02 开利公司 Dehumidification system for heat pump
CN106500378A (en) * 2016-09-29 2017-03-15 同济大学 Based on the efficient air conditioning unit and control method that high temperature refrigerant mixes again heat pattern

Also Published As

Publication number Publication date
EP1938026A1 (en) 2008-07-02
US20080196426A1 (en) 2008-08-21
EP1938026A4 (en) 2011-12-14
WO2007024237A1 (en) 2007-03-01
CA2616279A1 (en) 2007-03-01

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