METHOD AND AN APPARATUS IN A VENTILATION SYSTEM

20120255705

13/517298

December 07, 2010

A method for recovering heat and humidity in a ventilation system includes cooling warm and humid exhaust air at a condensation surface in a heat exchanger and collecting the condensate as formed, heating dry and cold supply air at the opposite side of the condensation surface and atomizing the condensate and supplying the atomized condensate to the supply air at the supply air inlet of the heat exchanger. The atomizing is generated b a piezoelectric atomizer. A device for recovering heat and humidity in a heat exchanger in a ventilation system includes a condensation surface at the exhaust air side of the heat exchanger and a collection device for condensate. At the inlet of the supply air side of the heat exchanger there is provided a piezoelectric atomizer that is fed with the condensate for supplying atomized condensate to the inlet.

Wallin, Peter (Kalmar, SE)

CLIMATE RECOVERY IND AB (Kalmar, SE)

1. In a ventilation system, a method of transferring heat and humidity from departing exhaust air to incoming supply air, comprising: extracting heat from the exhaust air in an exhaust air side in a heat exchanger, at least partly transferring the extracted heat to the supply air in a supply air side of the heat exchanger, bonding humidity carried by the exhaust air in the exhaust air side and at least partly humidity to the supply air, wherein the humidity is bonded by condensation in the exhaust air side of the heat exchanger, accumulating precipitated condensation, and atomizing or finely dividing into a mist or an aerosol at least a part of the condensate and supplying the mist or aerosol to the supply air in or at the supply air side of the heat exchanger.

2. The method as claimed in claim 1, wherein the mist or aerosol is supplied at the inlet to the supply air side of the heat exchanger.

3. The method as claimed in claim 1, wherein the water particles of the mist or aerosol are given a size <100μ.

4. The method as claimed in claim 1, wherein the mist or aerosol is generated by a piezoelectric plate (16) which is held immersed in the condensate and which is driven by means of a high frequency a.c. voltage.

5. The method as claimed in claim 1, wherein the supply of mist or aerosol is regulated in response to the relative humidity in the space in which the supply air is emitted.

6. An apparatus, in a ventilation system, for transferring heat and humidity from departing exhaust air to incoming supply air, comprising: a heat exchanged with a supply air side and an exhaust air side, and means for bonding humidity and at least partly transferring same to the supply air, wherein the means for bonding and transferring humidity comprises a condensation surface in the exhaust air side cooled by the supply air, accumulation and conduction means for accumulating the condensate, an atomiser for atomising or finely-dividing the condensate into a mist or aerosol of minute, air-borne water particles in the liquid phase, the accumulation and conduction means being disposed to emit the condensate to the atomiser.

7. The apparatus as claimed in claim 6, wherein the outlet of the atomiser for mist or aerosol is in flow communication with the inlet region of the supply air side.

8. The apparatus as claimed in claim 6, wherein the atomiser includes a piezoelectric plate which is in conductive communication with a source of high frequency a.c. voltage.

9. The apparatus as claimed in claim 6, characterised by a regulator device which, as an input signal, utilises the relative humidity or a parameter representative thereof in that space in which the supply air is emitted, and which is operative to control the operation of the atomiser or the supply of condensate thereto for regulating the relative humidity in that space in which the supply air is emitted, to a level which is perceived by humans as agreeable.

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