Heat exchange – Regenerator – Movable heat storage mass with enclosure
Patent
1998-08-21
2000-05-16
Atkinson, Christopher
Heat exchange
Regenerator
Movable heat storage mass with enclosure
165 10, 165 54, 165293, F23L 1502
Patent
active
060622962
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a heat recovery unit comprising a casing which contains at least one regenerative heat accumulator, whereby the casing has an inlet air opening, an exhaust air opening, an exterior air opening and a used-air opening, and whereby the exhaust air and the exterior air alternately pass through the heat accumulator.
BACKGROUND OF THE INVENTION
Heat recovery units are used in, amongst others, ventilation systems for e.g. ventilating buildings and at the same time returning the heat out of the exhaust air which is ventilated out from the building to the exterior air which is fed into the building in the form of inlet air.
A heat recovery assembly which is present on the market, has two plate housings which each surround their own regenerative plate package which forms the heat accumulators. Each plate housing is mutually joined with two valve housings. Each valve housing comprises a valve leaf which are each influenced by their own valve motor. One of the valve housings is equipped with a supply air fan which is connected to a supply air channel on the valve housing, and with an exhaust air fan which is connected to an exhaust channel on the valve housing. The valve housing itself is connected to each and all of the plate housings via a supply air opening resp. an exhaust air opening on the respective plate housings. The second valve housing is equipped with a used-air channel and an exterior air channel and is connected to each of the plate housings via a used-air opening resp. an exterior air opening of the respective plate housings.
Exhaust air resp. exterior air passes alternately through the plate packages. When one of the plate packages has warmed up and the other has cooled, the valve leaves in the valve housings are switched over, whereby the exhaust resp. exterior air changes plate package and have the opposite direction of flow compared with the air which previously flowed in the respective plate packages.
Another existing heat recovery assembly is the rotation heat exchanger where a continuous airflow flows through a rotating cylinder. The axis of rotation of the cylinder extends into a plane which coincides with a wall. On one side of the wall, warm air flows and on the other side cold air flows. By letting the warm air pass through the cylinder, the part of the cylinder which is on the "warm" side is warmed up. When the cylinder rotates, the warmed up part of the cylinder will go over to the "cold" side, whereby the cold air which flows through the cylinder is warmed up.
OBJECTS OF THE INVENTION
The main object of the present invention is to achieve a heat recovery unit which is equipped with at least one regenerative heat accumulator, which eliminates the need of a separate cross-over valve, which controls the exhaust air and the exterior air which pass through the heat accumulators. Preferably two heat accumulators are coupled together to a heat recovery unit.
Another object of the present invention is to provide a heat recovery unit which has a very low sound change in the ventilation system when the switching over occurs from the exterior air to the exhaust air, and vice versa, in the heat accumulators.
A further object of the present invention is to provide possibility of recirculatory operation with the heat recovery unit, which recirculates the exhaust air through the supply air opening under special operating conditions.
A further object of the present invention is to provide that the air flows in the same direction through the openings in the casing, irrespective of the direction of the air through the heat accumulators.
A further object of the present invention is to provide a low pressure drop across the heat recovery unit.
A further object of the present invention is to provide a high degree of temperature exchange in the heat recovery unit.
A further objector of the present invention is to provide a heat recovery unit which permits simple cleaning.
SUMMARY OF THE INVENTION
According to the invention these objects are achie
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