Heat exchange – Structural installation – Related to wall – floor or ceiling structure of a chamber
Patent
1980-11-20
1983-07-05
Tapolcai, Jr., William E.
Heat exchange
Structural installation
Related to wall, floor or ceiling structure of a chamber
98 33R, 137567, 137877, 165DIG12, F24H 306
Patent
active
043913210
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a heat exchanger in plants for ventilating rooms and buildings and is of the kind disclosed in the preamble to the appended main claim.
The invention is primarily intended for air change between relatively cold outside air and relatively warm air e.g. in dwelling rooms, cowsheds, piggeries etc. The invention can also be utilized, however, for air change between relatively warm outside air and relatively cold inside air in storage rooms with low temperatures, such as refrigeration rooms.
The object of the invention is to provide a relatively simple and cheap heat exchanger which is primarily intended to reduce the problems occurring in heat exchangers known up to now, when the outside air is relatively cold in relation to the relatively warm inside air in dwelling rooms, for example.
In known heat exchangers of the kind in question, the hot exhaust air is passed through a recuperative heat exchanger in one and the same direction in a first duct system, while the relatively cold supply air is passed through a second duct system in the opposite direction in the heat exchanger. During this flow, the walls separating the duct systems are heated up while there is a transfer of heat from the heated surfaces of the separating walls to the supply air in its duct system.
In countries with a relatively cold climate, it has been found that during certain times of the year the water vapor in the exhaust air condenses in certain conditions and deposits itself as moisture or even frost or ice in the duct system for the exhaust air. This results in a considerable reduction of the heat exchanger efficiency and thereby a reduction of heat recovery from the exhaust air. Up to now, once has been compelled to use heat exchangers with relatively expensive equipment to lessen these drawbacks, but because of this the known heat exchangers have been given limited use for reasons of cost.
However, this problem is solved in a simple, effective and relatively cheap mode with a heat exchanger which, in accordance with the invention, has the characterizing features disclosed in the appended claims.
The inventive heat exchanger has two known duct systems separated by partition walls through which heat is transferred from the relatively warm air in one duct system to the relatively cold air in the other duct system. A simple valve means is arranged on the side of the heat exchanger which is connected to the exhaust air ducting, and where the supply air ducting starts from the heat exchanger, said valve means being adapted in accordance with the invention to shunt the exhaust air and supply air ducting connections between the two duct systems of the heat exchanger. The exhaust air from the dwelling room will thus be supplied through one and the same exhaust duct to the heat exchanger, the valve means steering the exhaust air into the first or the second duct system. On the other hand, the supply air is supplied to the dwelling through one and the same supply duct, which is connected to the second or the first duct system.
The valve means can be shunted with the aid of relatively simple control means sensing humidity and temperature of the inside and outside air and shunting the valve means for predetermined conditions. Shunting is thus done with a certain frequency. In a simplified alternative, the frequency can be adjusted to a desired, fixed value, so that the two phases in the heat exchange alternate between predetermined time intervals.
In the inventive heat exchanger, the exhaust air will thus flow through the first duct system in one phase, and through the second duct system in the other phase, simultaneously as the flow of supply air through the heat exchanger alternates in a corresponding way.
In contradistinction to previously known heat exchangers of the kind in question, the inventive heat exchanger permits the use of relatively large heat-transferring surfaces in the heat exchanger. If large heat-transferring surfaces are used, which is a desire for increasing heat recovery, there are substanti
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patent: 850784 (1907-04-01), Richmond
patent: 1825498 (1931-09-01), Wogan
patent: 2019351 (1935-10-01), Lathrop
patent: 2303157 (1942-11-01), Bush
patent: 3500655 (1970-03-01), Lyons
patent: 4071080 (1978-01-01), Bridgers
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