Independent unit for heat exchange between a primary fluid and a

Details Independent unit for heat exchange between a primary fluid and a Independent unit for heat exchange between a primary fluid and a

1990-11-23

1991-08-06

Ford, John

Heat exchange

Structural installation

Related to wall, floor or ceiling structure of a chamber

165 75, 165 77, 165164, 165909, F24H 302, F24H 310, F24F 1200

Patent

active

050369067

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an independent unit for heat exchange between a primary fluid and a secondary fluid, in particular air for the ventilation and air conditioning of a room or of an area in a building, said unit being equally suitable for operation as a solar collector, as well as a water-water heat exchanger, for example for the recovery of heat from domestic water before its discharge into the sewers.
Independent ventilation or air conditioning units for an area or a room are already known which comprise a heat exchanger of the conventional type operating between the outside air introduced into the room and the inside air which is expelled to the outside. These exchangers have a very low output and rapidly become soiled with the result that they quickly become virtually unusable. It is almost impossible to clean them correctly, even using compressed air or acids. They are, moreover, associated with fans revolving at high speed to ensure an adequate supply of air through the exchanger which consume energy and which are particularly noisy, with the result that their installation in an office or room is very badly tolerated.
Independent conditioning units based on the principle of the heat pump are also known. However, these units have a very high prime cost and suffer from the inconveniences associated with the inherent principle of the heat pump. In addition, they do not provide for the ventilation of the room or area in which they are installed.
It is the object of the invention to provide an independent ventilation and conditioning unit for a room or an area which does not present the above-mentioned disadvantages and which, in particular, has a very low prime cost, which has great viability, which functions without noise with a high output and the installation, maintenance and servicing of which are particularly simple and easy to carry out.
The invention therefore proposes an independent heat exchange unit between a primary fluid and a secondary fluid, in particular air for the ventilation and conditioning of an area or a room in a building, comprising a heat exchanger traversed by the primary fluid and by the secondary fluid and at least one organ for circulating the fluid in the exchanger, characterized in that the exchanger takes the form of a casing, for example a parallelipipedal casing, comprising substantially parallel walls of which at least one is easily moveable or pivotally mounted about one of its sides to permit access to the other walls, said walls delimiting between themselves two substantially identical fluid passages in which circulate in counter current the primary fluid and the secondary fluid, said fluid passages having a corrugated shape in section, the sections of fluid passage in the exchanger being such that the speed of fluid circulation therein is low and less than about 1 meter per second in normal use.
A unit of this type is capable of ensuring a supply of air comprising between about 20 and 40 m.sup.3 of air per hour and thus of ensuring very satisfactory ventilation of a room or an area of normal dimensions when it is associated with a volumetric or dynamic fan turning at low speed (for example of the order of 500 to 800 revolutions per minute for a volumetric fan and of approximately 1200 revolutions per minute for an axial dynamic fan) the operating noise of the fan then being more or less inaudible.
The exchange of heat between the primary air and the secondary air normally occurs with a yield higher than 60% and, in general, comprising between 75 and 80% in such a way that the outside air introduced into the room is, depending on the case, cooled or heated by the inside air designed to be expelled outside, the ventilation of the room thus being effected without bringing about a notable change in the temperature inside the room.
There results, in cold weather, a significant saving in heating of the order of 25 to 30% since the ventilation of a room is permanently assured without it being necessary to open the windows and of allowing hot air from the room to escap

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Okada et al, "Design and Heat Transfer Characteristics of New Plate Heat Exchanger", Heat Transfer-Japanese Research, vol. 1, No. 1, Jan.-Mar. 1972, pp. 90-95.

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