EP2095040A1 - Contrôle de modulation de largeur d'impulsion pour ventilateur de pompe à chaleur pour éliminer un souffle d'air froid - Google Patents

Contrôle de modulation de largeur d'impulsion pour ventilateur de pompe à chaleur pour éliminer un souffle d'air froid

Info

Publication number
EP2095040A1
EP2095040A1 EP06847969A EP06847969A EP2095040A1 EP 2095040 A1 EP2095040 A1 EP 2095040A1 EP 06847969 A EP06847969 A EP 06847969A EP 06847969 A EP06847969 A EP 06847969A EP 2095040 A1 EP2095040 A1 EP 2095040A1
Authority
EP
European Patent Office
Prior art keywords
air
set forth
heat exchanger
heat pump
speed
Prior art date
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.)
Withdrawn
Application number
EP06847969A
Other languages
German (de)
English (en)
Inventor
Alexander Lifson
Michael F. Taras
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP2095040A1 publication Critical patent/EP2095040A1/fr
Withdrawn legal-status Critical Current

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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0293—Control issues related to the indoor fan, e.g. controlling speed
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger

Definitions

  • This application relates to a heat pump, wherein a fan for moving air into a conditioned environment is provided with a pulse width modulation control to address the problem of "cold blow”.
  • Heat pumps are known in the art and utilized to provide cooling to a conditioned environment during time periods of hot weather or excessive internal thermal load generation, and to provide heat to the same indoor environment when the weather is cold. Also, there are known a more simplistic heat pump designs that are able to operate just in a heating mode. Heat pumps have great potential to provide efficient conditioning to the indoor environment, however, there have been impediments to their use. ' One known problem with existing heat pump designs is so-called "cold blow.”
  • Cold blow occurs when the heat pump does not have sufficient heat rejection capability to adequately heat air being driven into the environment to be conditioned.
  • Pulse width modulation controls are known for controlling the amount of refrigerant passing to a compressor in a refrigerant system, such as an air conditioning system or a heat pump. However, pulse width modulation controls have not been utilized to address the "cold blow" problem mentioned above.
  • fan moving air over an indoor heat exchanger is operated in a pulse width modulated manner.
  • the use of the pulse width modulation control precisely tailors the amount of air moved over the indoor heat exchanger and into the climate-controlled environment, such that the heat rejected by the indoor heat exchanger, in the heating mode of operation, to the indoor air stream is sufficient to heat the controlled volume of air to the desired temperature.
  • the amount of air being driven into the environment will be reduced accordingly, such that air is delivered to a climate-controlled environment at the target temperature.
  • the present invention is able to precisely control the temperature of air delivered to the indoor space. If a two-speed fan is utilized, the pulse width modulation control can cycle the fan between the lower and a higher speed to achieve the desired effect. In the tatter case, the cycling between a lower speed and zero speed as well as a higher speed and zero speed is also permissible, if desired.
  • the time interval during which the fan is engaged in a full-speed position, for a single-speed fan, or in a higher speed position, for a two-speed fan is determined by the temperature requirement and comfort level, while the cycle rate is primarily determined by fan assembly reliability requirements and temperature variation tolerance bounds. Further, frequent cycling is not necessary, since refrigerant system thermal inertia compensates for sudden changes in fan speed. Also, the fan does not have to be brought to a full stop state, between activation and deactivation of the pulse width modulation signal, since the mechanical inertia allows for a softer start in a subsequent cycle.
  • Figure 1 shows a schematic of a heat pump incorporating the present invention.
  • Figure 2 shows a cycling sequence for a single-speed fan.
  • Figure 2 shows a cycling sequence for a two-speed fan.
  • a refrigerant system 20 is illustrated in Figure 1 and includes a compressor 22 delivering a refrigerant to a discharge line 23, and through a four-way valve 24 (if a heat pump is dedicated to heating applications only, then a four-way valve is not required) to an indoor heat exchanger 26. Downstream of the indoor heat exchanger
  • the refrigerant passes through an expansion device 28, and then to an outdoor heat exchanger 30.
  • the outdoor heat exchanger 30 is provided with a fan 32 to move air over the external heat transfer surfaces of the outdoor heat exchanger 30.
  • the refrigerant Downstream of the outdoor heat exchanger 30, the refrigerant passes again through the four- way valve 24, and into a suction line 33 returning the refrigerant to the compressor 22.
  • the refrigerant system 20 is illustrated in Figure 1 in a heating mode of operation.
  • the refrigerant system 20 can be moved to an air conditioning cooling mode of operation by switching the four-valve 24 and routing the refrigerant from the discharge line 23 initially to the outdoor heat exchanger 30, through the expansion device 28, and returning the refrigerant from the indoor heat exchanger 26 to the suction line 33.
  • the present invention is directed to an improvement that is particularly applicable when the refrigerant system is in a heating mode of operation.
  • FIG. 1 schematic for the heat pump 20 is a basic schematic, and as known to a person ordinarily skilled in the art, can be improved by adding a number of enhancement features and various options. All these designs are within the scope and can benefit from the invention.
  • an air-moving device such as fan 34, moves air over the indoor heat exchanger 26 and into an environment to be conditioned 36.
  • the heat exchanger 26 performs a condenser (or a gas cooler, for transcritical applications) function.
  • a control 38 (that could be a stand-alone control or a refrigerant system control) is provided with a feedback communication loop from a temperature sensor 49 and is capable to operate the indoor fan 34 in a pulse width modulation mode. Therefore, the control 38 can detect a lower than desired temperature of the air being delivered into the indoor environment 36.
  • control 38 is operable to provide a pulse width modulation control to a motor for the indoor fan 34 such that the average volume of air supplied by the indoor fan 34 to the conditioned environment 36 is reduced.
  • the control 38 is operable to provide a pulse width modulation control to a motor for the indoor fan 34 such that the average volume of air supplied by the indoor fan 34 to the conditioned environment 36 is reduced.
  • the desired temperature may be set by a thermostat 50.
  • the thermostat 50 can be utilized as a feed back device for the control 38.
  • a single-speed motor for the indoor fan 34 is rapidly cycled between “on” and “off (or fully engaged and fully disengaged) positions.
  • the indoor fan motor may be rapidly cycled between its higher and lower speed positions, as well as between the lower speed position and an "off position and between the higher speed position and an "off position".
  • the volume of air delivered into the environment 36 is precisely adjusted, such that the heat rejected by the indoor heat exchanger 26 is adequate to heat this adjusted air volume to the desired temperature.
  • the pulse width modulation cycling can be executed between any of the speeds, including a speed of zero.
  • Cycling can be executed between a zero and full speed, for a single-speed fan, and between the lower and the higher speed positions, as well as between the lower speed position and an "off position and between the higher speed position and an "off" position", for a dual-fan speed fan.
  • Multi-speed fans provide even a higher degree of flexibility and precision control.
  • indoor fan mechanical inertia may assist in continuous rotation of the indoor fan (although at a constantly reducing speed), while the pulse width modulation signal is activated and deactivated allowing for a softer start in a subsequent cycle.
  • Figure 2 is an exemplary chart of a temperature of air supplied to the conditioned space versus time, for a refrigerant system wherein the indoor fan motor is operable at a single, full speed, in an "on” or fully engaged position, and at a zero speed, in an "off or fully disengaged position.
  • the indoor heat exchanger is not capable to provide sufficient amount of heat to the nominal volume of air supplied to the conditioned environment, and the actual temperature is below the desired temperature, promoting "cold blow" conditions.
  • the indoor fan motor begins to cycle between a full speed (or an "on” position) and a zero speed (or an "off position), reducing the time-average amount of air supplied to the conditioned environment.
  • the actual supply air temperature increases, as well as approaches and reaches the desired temperature, while the pulse width modulation cycle parameters are adjusted to the correct values.
  • Figure 3 shows another embodiment, wherein the fan motor is operable at two speeds and can be cycled by the pulse width modulation control between the higher and lower speed positions, as well as between the lower speed position and an "off position and between the higher speed position and an "off position".
  • the fan is cycled between the lower speed position and the higher speed position.
  • the actual supply air temperature increases and soon approaches the desired temperature, with this arrangement.
  • a square waveform is used in Figure 2 and 3 embodiments for the pulse width modulation control, other waveforms are also feasible and within the scope of the invention. For instance, a trapezoidal, a triangular, a rounded square or any other waveform can be utilized instead.

Landscapes

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

Abstract

L'invention concerne un système réfrigérant de pompe à chaleur pourvu d'un contrôle à modulation de largeur d'impulsion pour un ventilateur déplaçant de l'air au-dessus de l'échangeur de chaleur intérieur. Lorsqu'il est déterminé qu'une quantité insuffisante de chaleur est rejetée par l'échangeur de chaleur intérieur pour chauffer le volume d'air fourni par le ventilateur dans l'environnement climatisé, le volume d'air fourni à l'environnement climatisé est réduit en utilisant une des techniques de modulation de largeur d'impulsion pour faire entrer le moteur de ventilateur intérieur dans un cycle de réduction du volume moyen d'air fourni. Par conséquent, un contrôle précis de la température de l'air fourni à l'espace climatisé est obtenu, la température de l'air fourni est augmentée à la valeur cible, et des conditions dites de 'souffle d'air froid' sont évitées.
EP06847969A 2006-12-21 2006-12-21 Contrôle de modulation de largeur d'impulsion pour ventilateur de pompe à chaleur pour éliminer un souffle d'air froid Withdrawn EP2095040A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2006/048896 WO2008076119A1 (fr) 2006-12-21 2006-12-21 Contrôle de modulation de largeur d'impulsion pour ventilateur de pompe à chaleur pour éliminer un souffle d'air froid

Publications (1)

Publication Number Publication Date
EP2095040A1 true EP2095040A1 (fr) 2009-09-02

Family

ID=39536591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06847969A Withdrawn EP2095040A1 (fr) 2006-12-21 2006-12-21 Contrôle de modulation de largeur d'impulsion pour ventilateur de pompe à chaleur pour éliminer un souffle d'air froid

Country Status (4)

Country Link
US (1) US20100000239A1 (fr)
EP (1) EP2095040A1 (fr)
CN (1) CN101809380A (fr)
WO (1) WO2008076119A1 (fr)

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US8033479B2 (en) 2004-10-06 2011-10-11 Lawrence Kates Electronically-controlled register vent for zone heating and cooling
US8371822B2 (en) 2008-08-05 2013-02-12 Lennox Industries Inc. Dual-powered airflow generator
US8510255B2 (en) 2010-09-14 2013-08-13 Nest Labs, Inc. Occupancy pattern detection, estimation and prediction
US9104211B2 (en) 2010-11-19 2015-08-11 Google Inc. Temperature controller with model-based time to target calculation and display
US9092039B2 (en) 2010-11-19 2015-07-28 Google Inc. HVAC controller with user-friendly installation features with wire insertion detection
US9448567B2 (en) 2010-11-19 2016-09-20 Google Inc. Power management in single circuit HVAC systems and in multiple circuit HVAC systems
US9268344B2 (en) 2010-11-19 2016-02-23 Google Inc. Installation of thermostat powered by rechargeable battery
US9046898B2 (en) 2011-02-24 2015-06-02 Google Inc. Power-preserving communications architecture with long-polling persistent cloud channel for wireless network-connected thermostat
US8944338B2 (en) 2011-02-24 2015-02-03 Google Inc. Thermostat with self-configuring connections to facilitate do-it-yourself installation
JP2014534405A (ja) 2011-10-21 2014-12-18 ネスト・ラブズ・インコーポレイテッド ユーザフレンドリーな、ネットワーク接続された学習サーモスタットならびに関連するシステムおよび方法
US9091453B2 (en) 2012-03-29 2015-07-28 Google Inc. Enclosure cooling using early compressor turn-off with extended fan operation
US9098096B2 (en) 2012-04-05 2015-08-04 Google Inc. Continuous intelligent-control-system update using information requests directed to user devices
US8620841B1 (en) 2012-08-31 2013-12-31 Nest Labs, Inc. Dynamic distributed-sensor thermostat network for forecasting external events
US9208676B2 (en) 2013-03-14 2015-12-08 Google Inc. Devices, methods, and associated information processing for security in a smart-sensored home
US8708242B2 (en) * 2012-09-21 2014-04-29 Nest Labs, Inc. Thermostat system with software-repurposable wiring terminals adaptable for HVAC systems of different ranges of complexity
CN105241016B (zh) * 2015-10-26 2018-04-17 四川长虹电器股份有限公司 多联式空调室内风机控制装置与方法
CN106765940B (zh) * 2016-12-16 2019-10-11 奥克斯空调股份有限公司 一种空调器制冷时防热出风的控制方法
US10663188B2 (en) * 2018-01-03 2020-05-26 Haier Us Appliance Solutions, Inc. Method for operating a packaged terminal air conditioner

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KR100248760B1 (ko) * 1997-06-27 2000-04-01 윤종용 공기조화기의 난방제어방법
US6131402A (en) * 1998-06-03 2000-10-17 Carrier Corporation Apparatus and method of operating a heat pump to improve heating supply air temperature
US6276148B1 (en) * 2000-02-16 2001-08-21 David N. Shaw Boosted air source heat pump

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Also Published As

Publication number Publication date
CN101809380A (zh) 2010-08-18
US20100000239A1 (en) 2010-01-07
WO2008076119A1 (fr) 2008-06-26

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