Air Supply Unit

Abstract

The object of the invention is an air supply unit ( 1 ) for recovering heat energy from an air stream (e.g., exhaust air) and transferring the heat energy to another air stream (e.g., supply air). The air supply unit ( 1 ) comprises a casing ( 25 ), in the casing ( 25 ) an exhaust air channel ( 4 ) for leading exhaust air ( 2 ) through the casing ( 25 ) of the air supply unit ( 1 ), in the casing ( 25 ) a supply air channel ( 7 ) for leading supply air ( 7 ) through the casing ( 25 ) of the air supply unit ( 1 ), and in the casing ( 25 ) a heat exchanger ( 10 ) for transferring heat energy between the exhaust air ( 2 ) flowing in the exhaust air channel ( 4 ) that leads through the casing ( 25 ) and the supply air ( 3 ) flowing in the supply air channel ( 7 ). In the casing ( 25 ), the air supply unit ( 1 ) comprises a heat pump ( 11 ) having a first heat interchanger ( 12 ) having a first interior for refrigerant, and a second heat interchanger ( 13 ) having a second interior for refrigerant. The first heat interchanger ( 12 ) is adapted into the supply air channel ( 4 ) between the first inlet ( 5 ) and the heat exchanger and the second heat interchanger ( 13 ) is adapted into the supply air channel ( 7 ).

1 . An air supply unit for transferring heat energy between exhaust air and supply air, the air supply unit comprising
 a casing which comprises:   an exhaust air channel for leading exhaust air through the casing of the air supply unit, the exhaust air channel having a first inlet for leading exhaust air into the exhaust air channel and a first outlet for leading exhaust air out of the exhaust air channel,   a supply air channel for leading supply air through the casing of the air supply unit, the supply air channel having a second inlet for leading supply air into the supply air channel and a first outlet for leading supply air out of the supply air channel, and   a heat exchanger comprising a rotating heat transfer element for transferring heat energy from exhaust air flowing in the exhaust air channel through the casing at least partially to supply air that flows through the casing in the supply air channel,   wherein in casing a heat pump having a first heat interchanger having a first interior for refrigerant, and a second heat interchanger having a second interior for refrigerant, a first fluid tube for leading refrigerant between the first interior of the first heat interchanger and the second interior of the second heat interchanger, a second fluid tube for leading refrigerant between the second interior of the second heat interchanger and the first interior of the first heat interchanger, an expansion device for effecting a pressure difference between the first and the second interior, and a compressor for circulating the refrigerant from the first heat interchanger to the second heat interchanger and from the second interchanger to the first interchanger, that the first heat interchanger of the heat pump is adapted between the first inlet and heat exchanger in the exhaust air channel leading through the casing, and   that the second heat interchanger of the heat pump is adapted into the supply air channel leading through the casing.   
   
   
       2 . The air supply unit according to  claim 1 , wherein the second heat interchanger is adapted between the second outlet and heat exchanger in the supply air channel leading through the casing. 
   
   
       3 . The air supply unit according to  claim 1 , comprising members for altering the flow direction of the refrigerant of the heat pump. 
   
   
       4 . The air supply unit according to  claim 1 , comprising a supply air filter for filtering the supply air. 
   
   
       5 . The air supply unit according to  claim 1 , comprising an exhaust air filter for filtering the exhaust air. 
   
   
       6 . The air supply unit according to  claim 1 , comprising a supply air fan for effecting the flow of supply air in the supply air channel. 
   
   
       7 . The air supply unit according to  claim 1 , comprising an exhaust air fan for effecting the flow of exhaust air in the exhaust air channel. 
   
   
       8 . The air supply unit according to  claim 1 , comprising an arrangement for transferring heat energy extracted from exhaust air at least partially to the hot water system for heating hot water. 
   
   
       9 . The air supply unit according to  claim 1 , comprising an arrangement for transferring heat energy extracted from supply air at least partially to the hot water system for heating hot water. 
   
   
       10 . The air supply unit according to  claim 8 , comprising a water heat exchanger through which the refrigerant of the heat pump and hot water may be led for transferring the heat energy absorbed by the refrigerant of the heat pump at least partially to the hot water. 
   
   
       11 . The air supply unit according to  claim 8 , comprising a water heat exchanger through which the refrigerant of the heat pump and
 water/anti-freeze solution intended for heating hot water may be led for transferring the heat energy absorbed by the refrigerant of the heat pump at least partially to the water/anti-freeze solution intended for heating hot water.   
   
   
       12 . The air supply unit according to  claim 8 , wherein the heat pump comprises connectors for connecting a water heat exchanger functionally to the heat pump so that the refrigerant of the heat pump may be led to the water heat exchanger for transferring the heat energy absorbed by the refrigerant at least partially to the hot water. 
   
   
       13 . The air supply unit according to  claim 10 , comprising an arrangement for leading the refrigerant of the heat pump either through the water heat exchanger when the refrigerant of the heat pump is led between the first heat interchanger and the second heat interchanger or past the water heat exchanger when the refrigerant of the heat pump is led between the first heat interchanger and the second heat interchanger. 
   
   
       14 . The air supply unit according to  claim 1 , wherein the heat pump forms a heat pump unit that is detachably adapted into the casing of the air supply unit.