EP2489964A1 - System und Verfahren zum optimierten Abtauen - Google Patents

System und Verfahren zum optimierten Abtauen Download PDF

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Publication number
EP2489964A1
EP2489964A1 EP11425039A EP11425039A EP2489964A1 EP 2489964 A1 EP2489964 A1 EP 2489964A1 EP 11425039 A EP11425039 A EP 11425039A EP 11425039 A EP11425039 A EP 11425039A EP 2489964 A1 EP2489964 A1 EP 2489964A1
Authority
EP
European Patent Office
Prior art keywords
hoarfrost
heat
temperature
evaporation
fluid
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Withdrawn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
EP11425039A
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English (en)
French (fr)
Inventor
Giuseppe Giovanni Renna
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.)
Digofin Srl
Original Assignee
Digofin Srl
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 Digofin Srl filed Critical Digofin Srl
Priority to EP11425039A priority Critical patent/EP2489964A1/de
Publication of EP2489964A1 publication Critical patent/EP2489964A1/de
Withdrawn legal-status Critical Current

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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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system

Definitions

  • the present patent application for industrial invention relates to a device and a method for optimized defrosting to be applied for defrosting the outer heat exchangers of the heat pumps.
  • the vapor compression cycles transfer heat from a low temperature heat source to a higher temperature heat source.
  • the low temperature heat source is made up of ambient air, which gives heat to the fluid operating the vapor compression cycle in a heat exchanger, which is generally of the finned type with fan.
  • the air gets colder and as a consequence, it increases the value of the respective humidity of the same air at the heat exchanger.
  • Object of the present invention is to provide a device apt to defrost efficiently the evaporation batteries of the outer units of the heat pumps without requiring the inversion of the vapor compression cycle.
  • a control logic able to sense the initial hoarfrost formation and to actuate the defrosting device before the hoarfrost formation is significant, thus obtaining the advantage of considerably shortening the defrosting cycle time and of avoiding off-design functioning conditions of the heat pump caused by low heat exchange efficiency.
  • the device according to the present invention can be introduced in any vapor compression cycle functioning system.
  • a system comprising a compressor (11), a heat exchanger (12) exchanging heat with the user circuit where there are introduced a pump (16) and an accumulation tank (17), a throttling valve (13) and a heat exchanger (14), which according to the present invention is provided with fan (15) exchanging with ambient air.
  • fan (15) exchanging with ambient air.
  • thermo-vector fluid can be a mixture of water and ethylene glycol or other fluid apt to exchange heat between the condensation temperatures and the cycle evaporation one.
  • thermo-vector fluid in output from the heat exchanger (12) crosses necessarily the heat exchanger (20) before arriving in the accumulation tank (17).
  • the heat exchanger (14) according to the present invention is provided with a rank (22) which is crossed by the thermo-vector fluid moved by the pump (21). Any air-water heat exchanger provided with two separated fluid circuits at the fluid side, one for the coolant operating the vapor compression cycle and one for a second thermo-vector fluid needed for defrosting, is in the protection scope of the present patent claims.
  • FIG 1 there are shown two temperature probes (23) and (24) respectively measuring the outer air temperature and the evaporation temperature of the the fluid operating the vapor compression cycle. It was shown in fact that the usage of the temperature difference between the outer air and the evaporating fluid as a control variable is a more reliable and sensible index of the possible hoarfrost formation than the evaporation pressure and therefore allows to actuate the defrosting system in conditions of initial hoarfrost formation, thus limiting the defrosting cycle time and the heat energy quantity to be used for the same defrosting. What is more important is that in this way it is avoided the need for cycle inversions, from heat pump to chiller.
  • the system for controlling the hoarfrost formation uses the temperatures sensed by the two temperature probes (23) and (24) as input variables and it compares them with the temperatures proven indicative by the experimental tests of a functioning without hoarfrost on the evaporation battery, with probable hoarfrost formation or even sure ice presence on the evaporation battery.
  • This method is efficient in that it anticipates the formation of ice layers on the battery, which are more difficult to be eliminated, by actuating the defrosting cycle for short time intervals.
  • this method for individuating the functioning conditions which provide probable hoarfrost formation is applicable also to heat pumps not provided with the defrosting circuit shown in figure 1 : in this case the sign of probable hoarfrost presence on the heat exchange surfaces can be used to actuate a cycle inversion.
  • the method uses the evaporation and outer air temperature values.
  • figure 2 it is shown a graph indicating the air temperature value on the x-axis and the sensed evaporation temperature value on the y-axis.
  • the points (38) and (39) define the variability range considered for the outer air temperature.
  • the individuation of the area of probable presence of hoarfrost (34) allows to carry out rapid defrosting cycles such that the hoarfrost is eliminated before an ice layer is formed.
  • a probability value for the hoarfrost presence which results from the ratio between the distance of the indicative point of the operating conditions inside the area (34) from the curve (40) and the distance between the curve (41) and the curve (40) delimiting, as said, the conditions of sure presence of ice and sure absence of hoarfrost.
  • the probability value of the hoarfrost presence thus determined can be therefore compared with a tolerated value of the maximum probability of hoarfrost formation before actuating the defrosting system.
  • the probability sensed exceeds the tolerated maximum probability, it is carried out a defrosting cycle of variable duration, directly proportional to the calculated formation probability of hoarfrost.
  • the condition needed for the output from the defrosting cycle is air and evaporation temperatures reading which define a point of low probability of hoarfrost, lower than a predefined value considered sufficiently low to interrupt the defrosting cycle.
  • the tolerated maximum probability value of hoarfrost formation before activating the defrosting system is increased by for example a quantity equal to 10%.
  • the outer air temperature values which define the points (31) and (32), since such values can vary as a function of the kind of the heat exchanger used without this leading to a variation in the sensing method of the initial formation of hoarfrost.
  • the average values for defining the points (31) and (32) are - 20C and 7°C for the outer air temperature corresponding to values -25°C and -2°C for the evaporation temperature.
  • the dimension of the area indicated with (34) where there is probable hoarfrost formation As a way of example it can be said that the distance between the two curves is between 5 and 10°C and that this value can also be function of the outer air temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Air Conditioning Control Device (AREA)
EP11425039A 2011-02-21 2011-02-21 System und Verfahren zum optimierten Abtauen Withdrawn EP2489964A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11425039A EP2489964A1 (de) 2011-02-21 2011-02-21 System und Verfahren zum optimierten Abtauen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11425039A EP2489964A1 (de) 2011-02-21 2011-02-21 System und Verfahren zum optimierten Abtauen

Publications (1)

Publication Number Publication Date
EP2489964A1 true EP2489964A1 (de) 2012-08-22

Family

ID=44118519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11425039A Withdrawn EP2489964A1 (de) 2011-02-21 2011-02-21 System und Verfahren zum optimierten Abtauen

Country Status (1)

Country Link
EP (1) EP2489964A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017037747A1 (en) * 2015-09-04 2017-03-09 Thermocold Costruzioni Srl Control method for defrosting the outdoor coil of a heat pump machine
CN120466891A (zh) * 2023-11-28 2025-08-12 国网山东省电力公司济南供电公司 一种用于绝缘工作斗的热泵除霜装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508143A1 (fr) * 1981-06-17 1982-12-24 Dietrich De Circuit de degivrage pour pompe a chaleur comprenant au moins un echangeur trois fluides
JPH04263758A (ja) * 1991-02-18 1992-09-18 Kansai Electric Power Co Inc:The ヒートポンプ式給湯装置
EP2048451A1 (de) * 2006-07-31 2009-04-15 Sanden Corporation Warmwasserversorgungsvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508143A1 (fr) * 1981-06-17 1982-12-24 Dietrich De Circuit de degivrage pour pompe a chaleur comprenant au moins un echangeur trois fluides
JPH04263758A (ja) * 1991-02-18 1992-09-18 Kansai Electric Power Co Inc:The ヒートポンプ式給湯装置
EP2048451A1 (de) * 2006-07-31 2009-04-15 Sanden Corporation Warmwasserversorgungsvorrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017037747A1 (en) * 2015-09-04 2017-03-09 Thermocold Costruzioni Srl Control method for defrosting the outdoor coil of a heat pump machine
US10591195B2 (en) 2015-09-04 2020-03-17 Ingersoll-Rand International Ltd Control method for defrosting the outdoor coil of a heat pump machine
CN120466891A (zh) * 2023-11-28 2025-08-12 国网山东省电力公司济南供电公司 一种用于绝缘工作斗的热泵除霜装置

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