Heat exchange – Regenerator
Patent
1984-08-14
1989-03-28
Joyce, Harold
Heat exchange
Regenerator
165 7, 165 10, F28D 1700
Patent
active
048155225
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a ventilation plant of the kind for the recovery of heat or cold in the outlet air and for preheating the inlet air to dwelling rooms or other heated localities such as workrooms, cowsheds, basements, foundations, cold-stores and the like. This type of plant is known for example from European patent application No. 0078783.
The purpose of the present invention is to provide an uncomplicated ventilation plant which can be assembled from simple and relatively inexpensive components while still maintaining the efficiency of the plant at a sufficiently high level.
This purpose is achieved with a plant which according to the invention has the features described hereinafter.
The heat exchangers included in the plant are duct heat exchangers representing a type of cyclically regenerative heat exchangers in which the heat-storing elements are alternatingly flushed through by the heating and the heated medium.
Up to now, heat exchangers have been designed as chamber heat exchangers and not as duct heat exchangers. In the past, the efficiency of the chamber heat exchangers in ventilation plants could only be achieved up to an average temperature efficiency of about 80% without oppressively high costs. In the plant according to the present invention the efficiency can be considerably increased simultaneously as the aggregate can be made less space-requiring and less expensive than the existing products with lower efficiency.
The chamber heat exchangers on today's market have limited heat-recovering capacity and are highly efficient only when the outlet air contains a certain excess of energy-carrying humidity, due to the fact that this surplus energy is exploited in the efficiency and that the kinetic energy of the fans is utilized in the form of excess heat.
The primary reason for low temperature efficiency in chamber heat exchangers is that the accumulator packages have much too limited surface areas and that the air cannot therefore effectively be brought into heat-emitting and heat-absorbing contact with the heat-storing elements.
With small accumulator surface areas the air speed is forced down in the accumulator portion in order to increase the thermal efficiency.
For improving the contact between known accumulators and air, the accumulator plates have been folded to enable the occurrance of turbulent air currents despite low air speed. The low speed of the air contributes to the risk of condensate precipitation and frost formation in the accumulator at low temperatures.
In addition, the possibilities of drying up the microcondensate deposited on the accumulator package are limited when dry cold air is heated and capable of taking up this moisture.
One reason for having such small accumulator surfaces is the opinion that a greater mass would be required for the accumulators due to the minute-long cycling periods of the valve means in normal operation.
The accumulators of the plant according to the invention are characterized in that, instead of a great mass, the accumulator has been given larger heat-absorbing and heat-emitting areas. The accumulators have been designed so as to cause the least possible degree of air turbulence at low speeds in view of the fact that the turbulence will increase with accelerating air speed in tubular ducts. In this way a satisfactory contact between air and accumulator walls is accomplished without artificially trying to create turbulence by purposely restricting the passage of air. Also, the accumulators have been given an elongated shape intended to increase the emission and absorption of heat at higher air speeds.
In this way the enlarged accumulator surfaces contribute to the moisture deposit spreading over a larger area as this moisture is not ventilated through the accumulator package and out. Moisture deposits dispersed over a larger area as a thin film, or a smaller amount per surface unit in combination with higher air speed, will diminish the drawbacks of moisture deposit and frost formation while simultaneously lowering the costs of th
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patent: 4049404 (1977-09-01), Johnson
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patent: 4493366 (1985-01-01), Ekman
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