CA3095319C - Condensing dehumidifier for an arena or the like - Google Patents
Condensing dehumidifier for an arena or the like Download PDFInfo
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- CA3095319C CA3095319C CA3095319A CA3095319A CA3095319C CA 3095319 C CA3095319 C CA 3095319C CA 3095319 A CA3095319 A CA 3095319A CA 3095319 A CA3095319 A CA 3095319A CA 3095319 C CA3095319 C CA 3095319C
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- evaporator
- dehumidifier
- compressor
- air
- condenser
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- 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
- F25D17/042—Air treating means within refrigerated spaces
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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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
- F24F3/1405—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 in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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- 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
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- 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
- F25D21/04—Preventing the formation of frost or condensate
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F2003/144—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 by dehumidification only
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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
- F24F2003/144—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 by dehumidification only
- F24F2003/1446—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 by dehumidification only by condensing
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/08—Installation or apparatus for use in sport halls, e.g. swimming pools, ice rings
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- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/023—Set point defrosting
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- 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
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- 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
- F25B2400/0411—Refrigeration circuit bypassing means for the expansion valve or capillary tube
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- 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
- F25B2400/12—Inflammable refrigerants
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- 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
- F25B2600/02—Compressor control
- F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage
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- 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
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/11—Sensor to detect if defrost is necessary
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- 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
- F25D21/02—Detecting the presence of frost or condensate
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- 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
- F25D21/14—Collecting or removing condensed and defrost water; Drip trays
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- 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
- F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
- F25D2317/04—Treating air flowing to refrigeration compartments
- F25D2317/041—Treating air flowing to refrigeration compartments by purification
- F25D2317/0411—Treating air flowing to refrigeration compartments by purification by dehumidification
Abstract
A dehumidifier for operation within the 5°C to 20°C temperature range and 50 to 100 percent relative humidity range of air includes an evaporator, a condenser, a fan that draws humid air through the evaporator and condenser, and a compressor for pumping refrigerant fluid through both the evaporator and condenser. The evaporation temperature is maintained in the evaporator at least at -4°C, resulting in a temperature within the evaporator and at the outlet thereof being greater than 0°C, thereby preventing the formation of ice in the evaporator and allowing the operation of the evaporator to its full power all the time.
Description
TITLE
Condensing Dehumidifier for an Arena or the Like FIELD
[0001] The present disclosure relates to air conditioning. More specifically, the present disclosure concerns a condensing dehumidifier for an arena or the like.
BACKGROUND
Condensing Dehumidifier for an Arena or the Like FIELD
[0001] The present disclosure relates to air conditioning. More specifically, the present disclosure concerns a condensing dehumidifier for an arena or the like.
BACKGROUND
[0002] Condensing dehumidifiers are well known in the art. They work by drawing moist air with a fan over the refrigerated coil of an evaporator 10, which condenses the water vapors in the air (See Figure 1). The air is then reheated by a condenser coil and released into the room. The humidity is collected in a tank or pan 12 or discharged to the drain by a pipe.
Similarly than with a refrigerator or an air conditioning system, a condensing dehumidifier requires a compressor and refrigerant in its design.
Similarly than with a refrigerator or an air conditioning system, a condensing dehumidifier requires a compressor and refrigerant in its design.
[0003] Condensing dehumidifiers work most effectively at higher ambient temperatures with a high dew point temperature. In cold climates, such as in an arena, the process is less effective.
[0004] Figure 1 shows typical operating temperatures of an evaporator 10 according to the prior art having three rows of tubes 14.
[0005] Providing the well-known refrigerant fluid R1 34a (1,1,1,2-Tetrafluoroethane) pumped by the compressor, the refrigerant temperature at the inlet 16 of the evaporator 10 is around -10 C. For an air entering the evaporator 10 at around between 13 C and 15 C and having a relative humidity of between about 80% and 60%, the temperature at the inlet of the evaporator is typically -2 C. This results in the formation of ice (not shown) on the evaporator 10.
[0006] Figure 2 is the enthalpy diagram of the RI 34a refrigerant fluid for a condensing dehumidifier according to the prior art, that incorporates the evaporator 10 under the above-mentioned operating conditions.
[0007] The point 18 corresponds to the entry of the refrigerant in the compressor, and the end of the expansion in the evaporator at -10 C, wherein the temperature of the refrigerant is at 10 C.
[0008] The points 22 and 24 on the diagram correspond respectively to the start and end of the condensation at around 40 C.
[0009] Point 26 corresponds to the maximum of undercooling, while point 28 corresponds to the entry point in the evaporator 10. The cycle ends at point 18 discussed above.
[0010] The compression work of the R134a refrigerant fluid expressed in kj/kg is shown as the delta enthalpy 30.
[0011] However, the power consumption (in kw/h) for each kg of water withdrawn should not be considered instantly, but within a 24 hours period.
[0012] When the air is below a certain temperature, about 18 C, some of the water condensing on to the evaporator 10 turns to ice before it has time to drip into the pan 12.
[0013] As the frost builds up, it insulates the evaporator and reduces the amount of water vapor condensing on it. If this went on unchecked the dehumidifier would eventually be damaged, causing refrigerant leaks.
[0014] To protect the dehumidifier and to enable it to remove more water from the air, the dehumidifier stops cooling the evaporator coil to allow the ice to melt. A sensor detects the formation of ice, triggers a switch, which turns off the compressor and the evaporator is no longer cooled. The fan continues to run so that the flow of air from the room can pass over the evaporator and assist with the thawing process.
[0015] With reference to the psychometric diagram shown in Figure 6, the evaporator 10, under the above-described operating conditions, will take 3 g (see 33) of water per kg of treated air while requiring 25 kj (31.5 kj (see point 32) ¨ 6 kj (see point 34)), resulting in 8.3 kj per gram of water taken from the air.
[0016] However, as mentioned hereinabove, there will be formation of ice in the evaporator 10. That ice has to be melted frequently and about 8,3 kj of energy for each g of water taken will have to be provided therefore.
Current dehumidifiers operating in relatively cold conditions, such as in an arena, spend 25 to 50 percent of their time and energy to defrosting.
Current dehumidifiers operating in relatively cold conditions, such as in an arena, spend 25 to 50 percent of their time and energy to defrosting.
[0017] The energy that has to be provided increases the energy balance of the dehumidifiers from the prior art over a 24-hour period.
[0018] A dehumidifier operating within the 5 C to 20 C that prevents the formation of ice into the evaporator is therefore desirable.
SUMMARY
SUMMARY
[0019] According to an illustrative embodiment, there is provided a dehumidifier for operation within the 5 C to 20 C range and within the 50 to percent relative humidity range of an air, comprising:
[0020] an evaporator having an evaporation temperature maintained at -4 C or above, resulting in a temperature within the evaporator and at the outlet thereof being greater than 0 C.
[0021] Such a dehumidifier prevents the formation of ice in the evaporator which yields the following benefits:
[0022] ¨ the evaporator can be operated to its full power all the time;
[0023] ¨ removes the need to regularly defrost the evaporator;
[0024] ¨ increase the quantity of water withdrawn in the air in a day;
and
and
[0025] ¨ therefore reduce the power consumption for each kg of water taken in the air.
[0026] Also, consequently, or proportionally to the decrease of electrical energy required per kg of water withdrawn, the quantity of heat released into the ambient is decreased.
[0027] Other objects, advantages and features of the dehumidifier will become more apparent upon reading the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In the appended drawings:
[0029] Figure 1, which is labelled "Prior Art" is a schematic view of an evaporator according to the prior art further showing typical operating conditions therefore;
[0030] Figure 2, which is labeled "Prior Art" is an enthalpic diagram of the R134a refrigerant fluid, showing the typical operating conditions of a dehumidifier from the prior art;
[0031] Figure 3 is a schematic view of a dehumidifier according to an illustrative embodiment;
[0032] Figure 4 is a schematic view of the evaporator and condenser part of the humidifier from Figure 3, showing the change in the air condition as it moves therethrough;
[0033] Figure 5 is an enthalpic diagram of the R134a refrigerant fluid, showing the typical operating conditions of the dehumidifier from Figure 3; and
[0034] Figure 6 is a psychometric diagram showing the comparative evolution of the air hygrometry as it passes through the evaporator from Figure 3 and through the evaporator from Figure 1.
DETAILED DESCRIPTION
DETAILED DESCRIPTION
[0035] In the following description, similar features in the drawings have been given similar reference numerals, and in order not to weigh down the figures, some elements are not referred to in some figures if they were already identified in a precedent figure.
[0036] The use of the word "a" or "an" when used in conjunction with the term "comprising" in the claims and/or the specification may mean "one", but it is also consistent with the meaning of "one or more", "at least one", and "one or more than one". Similarly, the word "another" may mean at least a second or more.
[0037] As used in this specification and claim(s), the words "comprising" (and any form of comprising, such as "comprise" and "comprises"), "having" (and any form of having, such as "have" and "has"), "including" (and any form of including, such as "include" and "includes") or "containing" (and any form of containing, such as "contain" and "contains"), are inclusive or open-ended and do not exclude additional, unrecited elements.
[0038] A dehumidifier 40 for an arena according to a first illustrative embodiment will be described with reference to Figure 3.
[0039] The dehumidifier 40 comprises an evaporator 42, including a condensate pan 43 thereunder, a condenser 44, a compressor 46, a bypass circuit 48, including two valves 50 and 82, and a fan (not shown) that conventionally draws humid air through the evaporator 42 and condenser 44.
[0040] For illustrative purposes, the refrigerant used in the dehumidifier 40 is the well-known R134a (1,1,1,2-Tetrafluoroethane) refrigerant fluid. However, other refrigerant fluids, such as, without limitations, the R404/507 can also be used.
[0041] The evaporator 42 is selected so as to yield a latent power /
total power ratio that allows a very low T delta (evaporation / treated air) (typically of less than 10 K) without the formation of ice.
total power ratio that allows a very low T delta (evaporation / treated air) (typically of less than 10 K) without the formation of ice.
[0042] The evaporator 42 includes seven (7) rows of tubes 52 so as to increase the surface contact of the humid air therewith (see Figure 4).
According to other embodiments, the evaporator includes another number of rows of tubes above five (5) rows of tubes 52.
According to other embodiments, the evaporator includes another number of rows of tubes above five (5) rows of tubes 52.
[0043] The evaporator 42 is further configured to drain the water to the condensate pan 43 as quickly as possible to prevent ice formation. For such purpose, the evaporator 42 has a height of about 200 mm. According to another embodiment, the evaporator has another height that is lower than about 300 mm.
[0044] According to another embodiment (not shown), the condensate pan is substituted by another water collecting element, such as, without limitations, a tank.
[0045] The compressor
46 is for example a Copeland ScroIlTM ZB26 compressor. An illustrative embodiment of a dehumidifier is however not limited to such compressor model.
[0046] The compressor 46 pumps the refrigerant fluid through the condenser 44 and then the evaporator 42.
[0046] The compressor 46 pumps the refrigerant fluid through the condenser 44 and then the evaporator 42.
[0047] Since evaporators, condensers, compressors and refrigerant fluids are believed to be well-known in the art, they will not be described herein in more detail for concision purposes.
[0048] Further characteristics of the dehumidifier 40 will become more apparent upon reading the following description of the operation thereof, with reference to Figures 3 to 5 and with an air entering the dehumidifier 40, and more specifically the evaporator 42, at 15 C with a relative humidity of percent.
[0049] The refrigerant fluid enters the evaporator 42 at -3 C (see point 60 on Figures 3 and 5). The expansion of the fluid starts at point 62 and ends at point 64 in Figure 5). The temperature of the fluid remains at -3 C
during the expansion, which corresponds to the evaporation temperature.
during the expansion, which corresponds to the evaporation temperature.
[0050] The refrigerant fluid is then pumped through the compressor 46 thereby (see arrow 66 in Figure 3), wherein the refrigerant fluid exits the evaporator at 8 C and enters the compressor 46 at 10 C (see point 68).
[0051] The refrigerant fluid then enters the condenser at 45 C (see point 70) and the condensation starts and ends at 25 C (see points 72 and 74 respectively). Then the fluid enters a sub cooling phase at 15 C which ends at point 76.
[0052] The work 78 of the compressor 46, which occurs between point 68 and 70, is lower than for the dehumidifier from the prior art, as shown in Figure 2, for a same refrigerant fluid (R134a according to the illustrated embodiment).
[0053] With reference to Figures 3 and 4, it is interesting to note that the air entering the evaporator 42 at 15 C (see arrows 76) exits the evaporator 42 at 1 C (see arrows 78), thereby preventing the formation of ice in the evaporator 42.
[0054] As it is well-known to a person skilled in the art, the compression work varies depending on the refrigerant fluid used and compressor 46. However, for same refrigerant fluid and compressor, the compression work remains lower for the dehumidifier 40 compared to a dehumidifier from the prior art, considering an operating range of operation between 5 C to 20 C. Also, with reference to Figures 2 and 5, the delta between evaporation and condensation temperatures is minimized.
[0055] The air then continues through the condenser 44 where it exits at 20 C (see arrows 80).
[0056] Returning to Figures 3 and 5, while the evaporation temperature according to the illustrated embodiment is -4 C, it has been found that maintaining the evaporator temperature at any value of -4 C and above allows maintaining the air temperature at the exit of the evaporator 42 above the freezing point, thereby preventing the formation of ice therein.
[0057] To maintain such a temperature in the evaporator 42, a bypass circuit 48 is provided, wherein refrigerant exiting the compressor 46 at 45 C is directed into the evaporator 42. The bypass circuit 48 includes a first valve 50 between the compressor 46 and evaporator 42, and a second valve 82 is provided between the condenser 44 and evaporator 42.
[0058] According to another embodiment (not shown), the bypass circuit 48 is omitted. According to still another embodiment, the compressor's pump speed is varied to maintain the temperature in the evaporator 42 to the desired value. According to a further embodiment, the dehumidifier includes a power capacity reducing system for the compressor.
[0059] With reference to Figure 6, the evaporator 42 withdraws 2.5 g of water per kg of air (see 84), while using 25 kj/g (31.5 kj ¨ 6.0 kj) (point 32 ¨ point 86). This results in 8kj/g of withdrawn water. This is compared to the 8.3kj/g for the system from the prior art described hereinabove. However, as already mentioned, additional energy is required in the systems form the prior art to melt the ice formed into the evaporator.
[0060] Considering the above, and the fact that the work of the compressor is lower in the dehumidifier 40 compared to in systems from the prior art (see 78 on Figure 5 vs 30 in Figure 2), it results that the dehumidifier 40 is more efficient and consumes less energy.
[0061] However, the advantages of the dehumidifier 40 compared to systems from the prior art do not end there.
[0062] First the number and dimensions of the components of the dehumidifier 40 is reduced compared to dehumidifiers from the prior art. This is allowed by the improved efficiency of the overall system 40 to withdraw water vapor from the air compared to systems from the prior art.
[0063] Since the quantity of water withdrawn from the air is increased, the air flow is lower. This results in less work for the fan, less clogging of the fan filters, and therefore less frequent changes thereof, and a reduced sound level of the overall system 40.
[0064] It is to be noted that many modifications could be made to the dehumidifier 40 described hereinabove and illustrated in the appended drawings. For example:
[0065] ¨ when greater dehumidifying power is required, a dehumidifier according to another embodiment may include a plurality of evaporators 42, each equipped with its own condensate pan 43. The power and dimensions of the other components are of course adapted to the application;
[0066] ¨ other compressor and/or refrigerant fluid than the ZB26 and R134a respectively can be used;
[0067] ¨ the heat returned by the dehumidifier 40 in its surrounding may be lowered by heating the condensed water using discharge gas from the condenser 44. Thus, the condensates which flow at a temperature of 1 to 3 C, can be warmed up to 25 C, yielding a dissipated heat gain of 91.96 kJ / kg of water drained ((25 - 3) x 4.18);
[0068] - the condenser can be positioned outside while the remaining components of the dehumidifier remains inside. This would allow the dehumidifier to operate in a dehumidification/heating during winter and dehumidification/cooling during summer.
[0069] While the dehumidifier 40 has been described with reference to its use in an arena, an illustrative embodiment of a dehumidifier can also be used in other contexts such as without limitation in the food industry, and in any spaces wherein significant amounts of water is present in the air, including slaughterhouses, sports halls, churches, mines, ship holds, storage, bridge pilings, underground parking, heritage buildings, sheers, forage and cereal dryers, etc.
[0070] Although a dehumidifier has been described hereinabove by way of illustrated embodiments thereof, it can be modified. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that the scope of the claims should not be limited by the preferred embodiment but should be given the broadest interpretation consistent with the description as a whole.
Claims (5)
1. A dehumidifier for operation within a 5 C to 20 C
temperature range and 50 to 100 percent relative humidity range of an air comprising:
an evaporator having at least six (6) rows of tubes and a height that is lower than about 300 mm;
a system to maintain the evaporation temperature of the evaporator to -4 C or above, resulting in a temperature within the evaporator and at an outlet thereof being greater than 0 C;
a condenser;
a fan for drawing the air through both the evaporator and condenser; and a compressor for forcing a refrigerant fluid through the condenser and evaporator.
temperature range and 50 to 100 percent relative humidity range of an air comprising:
an evaporator having at least six (6) rows of tubes and a height that is lower than about 300 mm;
a system to maintain the evaporation temperature of the evaporator to -4 C or above, resulting in a temperature within the evaporator and at an outlet thereof being greater than 0 C;
a condenser;
a fan for drawing the air through both the evaporator and condenser; and a compressor for forcing a refrigerant fluid through the condenser and evaporator.
2. The dehumidifier of claim 1, wherein the system to maintain the evaporation temperature to -4 C or above includes a bypass circuit to direct part of the refrigerant fluid directly from an outlet of the compressor to the evaporator.
3. The dehumidifier of claim 1, wherein the compressor having a pump; the system to maintain the evaporation temperature to -4 C or above includes at least one of a speed controller and a power controller for the pump.
4. The dehumidifier of claim 1, wherein the evaporator includes a water collecting element.
5. The dehumidifier of claim 4, wherein the water collecting element is a pan or a tank.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/CA2018/000075 WO2019200448A1 (en) | 2018-04-20 | 2018-04-20 | Condensing dehumidifier for an arena or the like |
Publications (2)
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CA3095319A1 CA3095319A1 (en) | 2019-10-24 |
CA3095319C true CA3095319C (en) | 2023-09-12 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CA3095319A Active CA3095319C (en) | 2018-04-20 | 2018-04-20 | Condensing dehumidifier for an arena or the like |
Country Status (4)
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US (1) | US20210164671A1 (en) |
EP (1) | EP3781875A4 (en) |
CA (1) | CA3095319C (en) |
WO (1) | WO2019200448A1 (en) |
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CN114576915B (en) * | 2020-11-30 | 2023-06-30 | 合肥美的电冰箱有限公司 | Refrigerator refrigerating system and refrigerator defrosting method |
CN114857749B (en) * | 2022-04-29 | 2023-10-13 | 海信(广东)空调有限公司 | Air conditioner and method for controlling defrosting of air conditioner |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2048461A (en) * | 1979-11-22 | 1980-12-10 | Univ Adelaide | Method of air conditioning |
DE19548458A1 (en) * | 1995-12-22 | 1997-06-26 | Inst Luft Kaeltetech Gem Gmbh | Method for cooling and dehumidifying room air |
JP3699623B2 (en) * | 2000-01-31 | 2005-09-28 | 株式会社荏原製作所 | Heat pump and dehumidifier |
GB2381061A (en) * | 2001-10-18 | 2003-04-23 | John Edward Gough | Dehumidifiers |
US20030106677A1 (en) * | 2001-12-12 | 2003-06-12 | Stephen Memory | Split fin for a heat exchanger |
US6952930B1 (en) * | 2003-03-31 | 2005-10-11 | General Electric Company | Methods and apparatus for controlling refrigerators |
CN1997861A (en) * | 2004-04-09 | 2007-07-11 | 艾尔研究公司 | Heat and mass exchanger |
ITPN20050069A1 (en) * | 2005-10-06 | 2007-04-07 | Electrolux Professional Spa | REFRIGERATOR UNIT FOR THE COOLING OF PRESSURIZED DRINKS |
JP2008055947A (en) * | 2006-08-29 | 2008-03-13 | Denso Corp | Air conditioner |
US8117855B2 (en) * | 2010-02-19 | 2012-02-21 | Alexander P Rafalovich | Refrigeration system with consecutive expansions and method |
GB201401092D0 (en) * | 2014-01-23 | 2014-03-12 | Rolls Royce Plc | Heat exchanger support |
US10066860B2 (en) * | 2015-03-19 | 2018-09-04 | Nortek Global Hvac Llc | Air conditioning system having actively controlled and stabilized hot gas reheat circuit |
JP6628878B2 (en) * | 2016-06-20 | 2020-01-15 | 三菱電機株式会社 | Cooling system |
JP6791349B2 (en) * | 2017-02-23 | 2020-11-25 | 三菱電機株式会社 | Dehumidifier |
CN107023899A (en) * | 2017-03-28 | 2017-08-08 | 南京师范大学 | A kind of depth dehumidified air handles unit |
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2018
- 2018-04-20 US US17/044,965 patent/US20210164671A1/en not_active Abandoned
- 2018-04-20 EP EP18914948.7A patent/EP3781875A4/en not_active Withdrawn
- 2018-04-20 WO PCT/CA2018/000075 patent/WO2019200448A1/en unknown
- 2018-04-20 CA CA3095319A patent/CA3095319C/en active Active
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CA3095319A1 (en) | 2019-10-24 |
US20210164671A1 (en) | 2021-06-03 |
EP3781875A1 (en) | 2021-02-24 |
EP3781875A4 (en) | 2022-03-30 |
WO2019200448A1 (en) | 2019-10-24 |
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