Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
  • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
  • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
  • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
  • F24F12/002—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid
  • F24F12/003—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid using a heat pump
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
  • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
  • Y02B30/56—Heat recovery units

Definitions

• the invention relates to a method for cooling outside air which is being supplied to a space for ventilation thereof.
• the summers in regions with typically temperate climates have become increasingly warmer.
• the conditioning of air is however an expensive process requiring much energy. This is usually still too expensive for use in homes.
• Both the supply air and the discharge air are preferably brought into heat-exchanging contact with an intermediate medium, which is evaporated by the supply air and condensed by the discharge air.
• an intermediate medium which is evaporated by the supply air and condensed by the discharge air.
• the discharge air is further heated and the supply air cooled more deeply by this intermediate medium than would be possible on the basis of their temperature difference with direct heat-exchanging contact .
• a part of the supply air is preferably admixed directly to the discharge air before the discharge air is brought into contact with the intermediate medium. A greater airflow over the condenser is thus obtained.
• the supply air and the discharge air can be placed in direct heat-exchanging contact with each other before the indirect heat-exchanging contact.
• the supply air is hereby precooled to some extent, whereby a higher cooling capacity is achieved with the same energy consumption.
• the temperature of the supply air is adjusted by varying the amount of outside air supplied to the space per unit of time. With a constant cooling capacity the temperature of the ventilation air can thus be decreased by decreasing the flow rate.
• the invention further relates to an apparatus for cooling outside air being supplied to a space for ventilation thereof, with which the above described method can be performed. According to the invention such a cooling apparatus is characterized by means for bringing the supply air into indirect heat-exchanging contact with discharge air extracted from the space .
• the indirect contact means preferably comprise at least one compression refrigerating device with an evaporator which is connected to a duct for the supply of air and a condenser connected to a duct for discharge of air.
• the cooling apparatus can advantageously be provided here with means for diverting a part of the supply air directly to the condenser.
• the diverting means preferably comprise a fan and a non-return valve co-acting therewith.
• the cooling apparatus is provided with a l ⁇ eat exchanger connected before the compression refrigerating device and connected to the air inlet and the air outlet.
• a structurally simple and compact embodiment of the cooling apparatus is obtained when the compression refrigerating device and the heat exchanger are combined.
• the compression refrigerating device can thus be readily combined with a heat exchanger or heat recovery installation already present in a home, such as made commercially available in different forms by applicant.
• the compression refrigerating device and the heat exchanger can then advantageously have joint provisions here for draining condensation formed therein.
• Fig. 1 shows a schematic diagram of the method for cooling ventilation air according to the invention
• Fig. 2 is a perspective view of a combination of a compression refrigerating device and a heat exchanger of a ventilation system
• Fig. 1 shows a schematic diagram of the method for cooling ventilation air according to the invention
• Fig. 2 is a perspective view of a combination of a compression refrigerating device and a heat exchanger of a ventilation system
• Fig. 1 shows a schematic diagram of the method for cooling ventilation air according to the invention
• Fig. 2 is a perspective view of a combination of a compression refrigerating device and a heat exchanger of a ventilation system
• Fig. 1 shows a schematic diagram of the method for cooling ventilation air according to the invention
• Fig. 2 is a perspective view of a combination of a compression refrigerating device and a heat exchanger of a ventilation system
• Ventilation system 11 serves in known manner to draw in fresh outside air A by means of a fan 12 via a suction duct 13, and to supply this air via a feed duct 14 as ventilation air V to one or more spaces S.
• ventilation system 11 draws air R out of space (s) S via a return duct 16 using a fan 15 and guides it via a discharge duct 17 back to the environment as discharge air D.
• Ventilation system 11 is further provided in known manner with a heat exchanger 10, in which the used air drawn from space (s) S is brought into heat-exchanging contact with the fresh outside air to be used for ventilation.
• This heat exchanger 10 is particularly important in the winter to transfer the heat present in the discharge air to the cold outside air, so that this latter is already preheated and heat loss resulting from the ventilation is prevented as far as possible.
• the ventilation air is already cooled to some extent in this heat exchanger 10. This cooling is however often insufficient to ensure a pleasant indoor climate. According to the invention the air to be supplied to space (s) S is therefore cooled still further.
• the compression refrigerating device 2 comprises an evaporator 3 and a condenser 4 which are mutually connected by a conduit 9 in which a coolant circulates.
• This coolant which functions as intermediate medium for the indirect heat- exchanging contact between the supply air and the discharge air, is pumped round in conduit 9 by a compressor 18 which once again brings the vaporous coolant from evaporator 3 to a pressure such that it can condense in condenser 4.
• a pressure-reducing element 19 is further arranged between condenser 4 and evaporator 3, whereby the condensed coolant once again expands and is reduced so much in pressure that it can evaporate in evaporator 3.
• the fresh air to be supplied to space (s) S is guided from heat exchanger 10 via feed duct 14 to evaporator 3, where the heat required to evaporate the coolant is extracted from the air.
• the used air coming from space (s) S is simultaneously guided from heat exchanger 10 via discharge duct 17 to condenser 4, where this discharge air is heated so that the coolant cools and condenses.
• An additional quantity of air can be guided through condenser 4 in order to enhance the condensation.
• a branch duct 8 through which a part of the indrawn outside air A can be guided directly to condenser 4.
• a small auxiliary fan 6 which draws in the outside air A.
• An automatic return valve 7 is also accommodated in branch duct 8. This is open as long as fan 6 is in operation, but remains closed in all other cases, so that no air can flow out of discharge duct 17 to suction duct 13. Contact is thus avoided between the - generally contaminated - discharge air and the fresh outside air.
• Fans 12 and 15 can further be controllably connected to means (not shown here) for detecting the temperature of the ventilation air V being supplied to the space (s).
• cooling apparatus 1 By controlling the fans 12, 15, and thereby the flow rate of ventilation air V, the temperature thereof can be adjusted without the operation of cooling apparatus 1 having to be controlled.
• the structural embodiment of cooling apparatus 1 is shown in fig. 2 and 3. Here is shown that it is combined with heat exchanger 10, which nowadays often forms part of the ventilation system 11 usually already present in homes.
• Cooling apparatus 1 comprises a housing 20 which can be mounted on a housing 21 of heat exchanger 10 and which has in its bottom 22 four openings 23 (of which only two are shown here) which correspond with the supply and discharge ducts 13, 14, 16, 17 of heat exchanger 10. Housing 20 is divided by separating walls 24, 25, 26,
• Compressor 18 and expansion valve 19 are placed in a central compartment, while evaporator 3 and condenser 4 are accommodated in two diametrically opposite compartments.
• the two remaining compartments function only as respective components of suction duct 13 and return duct 16.
• the auxiliary fan 6 is also accommodated in the compartment forming part of suction duct 13.
• Two further compartments are also formed by inclining walls 28, 29 for the purpose of receiving all manner of accessories, such as control electronics and the like.
• On the top the housing 20 is closed by a cover 30 in which four openings are formed for connection to supply and discharge ducts (not shown here) of ventilation system 11.
• cooling apparatus 1 There is the chance during use of cooling apparatus 1 of condensation forming at the position of evaporator 3 as a result of the low temperatures prevailing there. Provisions are therefore made to collect and drain this condensation.
• the heat exchanger 10 is already provided with a condensation drain, and cooling apparatus 1 is connected to heat exchanger 10 such that condensation created in cooling apparatus 1 also runs into the condensation drain of heat exchanger 12 and is discharged.
• the above described apparatus thus provides the option of combining the ventilation of a building, in particular a home, with the cooling thereof in efficient manner and using relatively simple means.
• the invention is expressly not limited to the above exemplary embodiment. All new aspects of the described method and apparatus can be used per se in other combinations while retaining the associated advantages. The scope of the invention is defined solely by the following claims.

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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)

Applications Claiming Priority (2)

Publications (1)

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• 2005
  • 2005-02-04 EP EP05704617A patent/EP1711751A1/de not_active Withdrawn
  • 2005-02-04 WO PCT/NL2005/000087 patent/WO2005075896A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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