Refrigeration – With means preventing or handling atmospheric condensate... – Means utilizing heat developed by refrigeration producer
Patent
1996-07-02
1998-01-06
Doerrler, William
Refrigeration
With means preventing or handling atmospheric condensate...
Means utilizing heat developed by refrigeration producer
62 80, 62276, 62525, F25B 502, F25D 2108, F25D 1706
Patent
active
057042217
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a refrigerating exchanger, a method for control thereof and a cooling installation including such exchanger.
The cooling installation may be a refrigerating chamber, a chill or quick-freezing room, a refrigerated display cabinet, a refrigerated display case or the like.
Such an installation includes a cabinet which defines an enclosure wherein a given-low-temperature must be kept. Therefore, air circulation means are provided, which are suitable for circulating air within such enclosure and at least one refrigerating exchanger which a refrigerating or cool transfer fluid passes through.
Such an exchanger is typically in the form of a battery with several layers and several rows.
BACKGROUND OF THE INVENTION
According to document U.S. Pat. No. 5,031,413, the battery is arranged in two similar elements, connected in parallel, and separated by means of partitions. Each element has its own air flow and its own fan. Such structure makes it possible to keep a satisfactory relative humidity, since the evaporators are always operated on an alternative basis.
Document GB-A-2,164,133 also relates to a structure which tends to keep a satisfactory relative humidity in a refrigerated display case. The structure comprises two evaporators connected in parallel, with one providing for a cooling function and the other one providing for a humidifying function.
Document U.S. Pat. No. 4,373,353 discloses an air-conditioning installation including a plurality of evaporators aiming at avoiding the overload of the compressor.
SUMMARY OF THE INVENTION
This invention aims at providing for the defrosting of an exchanger in a cooling installation while simultaneously keeping an acceptable cooling temperature complying with the requirements in the enclosure which such installation is associated with, while avoiding a refrigerating output in excess with respect to the needs.
As a matter of fact, a rise in temperature resulting from the defrosting, which would be disadvantageous if too high should be avoided, more particularly so if the products stored in the enclosure are heat sensitive.
It is further advisable, for cost-saving reasons, that the refrigerating output of the installation does not exceed the actual needs by far.
Therefore, this invention provides, according to a first aspect, a refrigerating exchanger such as previously mentioned, wherein the battery comprises at least three elements, each having a refrigerating output which is a fraction of the entire exchanger nominal output, so as to allow for at least one of the elements to be defrosting, at a given time of the exchanger operation, and for at least two of the elements to be cold-producing, the elements being, in turn, defrosting or cold-producing.
According to another feature, the exchanger, which includes heat exchanging means, further includes air circulation means on the heat exchanging means so arranged as to form a common air flow at the battery inlet and a common air flow at the battery outlet.
Alternatively, and according to still another feature of the invention, the exchanger also comprises selective air circulation or non-circulation means on the heat exchanging means of each element in such a manner that the air circulation is authorised for some elements and not authorised for the other elements.
Such selective means are associated with control means. Air circulation is authorised for the cold-producing elements and is not authorised for the defrosting elements. Heating of the heat exchanging means, for each element, is provided in such a manner that it is activated for an element for which air circulation is not authorised and to be inactivated for an element for which air circulation is authorised.
According to a second aspect, this invention relates to a method of control of such exchanger, wherein: cold-producing elements are made operational, while one at least of the elements is defrosting; sufficient, another similar cycle N+1 is started, wherein one or more cold-producing element(s) in cycle N
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Doerrler William
McInternational
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