Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1996-06-13
1998-08-25
Wayner, William
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
62332, F25B 700, F25B 2500
Patent
active
057972753
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cooling system for cooling air, such as indoor air, wherein the cooled air can be used for cooling telecommunications equipment for instance, and wherein the air is used to carry away thermal energy.
DESCRIPTION OF THE BACKGROUND ART
Various thermal energy dissipating systems are known to the art in which air is used as a heat transporting medium. A feature which is common to one group of systems is that air is treated, i.e. cooled, and then recirculated in the room to be cooled or in the room in which a particular item is to be cooled. Thus, a room in which telecommunications equipment is installed can be cooled in several different ways. For instance, the indoor air, or room air, can be cooled with the aid of a compressor cooling system or with the aid of a cold liquid. A common feature of both these methods is that the heat exchangers used to effect heat transfer between coolant and air and between liquid and air respectively have similar constructions.
Free cold is used in order to keep operating costs as low as possible. By free cold is meant essentially that when outdoor temperatures are low, the air is used directly in this state for cooling purposes, instead of operating an energy-demanding cooling system, such as a compressor cooling system, for instance. The use of free cold can save considerable quantities of energy. In one method of cooling with cold air, liquid is circulated and cooled by the cold outdoor air and then used to cool the room air. This method is efficient up to a given outdoor temperature, whereafter the air must be cooled with the aid of some other means, for instance with the aid of a compressor cooling system. A free-cold cooling system could well be used as a backup system for a compressor cooling system and brought into use should the compressor cooling system malfunction for some reason. In cases such as these, the free cooling system is referred to as a redundancy for the compressor cooling system.
SUMMARY OF THE INVENTION
With the intention of obtaining a cooling system of compact design which can be embodied in one single unit with redundancy and free cold, the heat exchangers of the cooling system have been combined so that the room air is cooled in the cooling system by means of cold liquid or by means of a boiling coolant in a combined evaporator-air cooler, and the outdoor air cools warm liquid or condensing coolant in a combined condenser-liquid cooler. Free cold may be utilized when the difference in temperature between indoor air, or room air, and outdoor air is sufficiently large and the outdoor air is sufficiently cold. Liquid that is cooled by the outside air in the combined condenser-liquid cooler (EC) and then heated by the room air in the combined evaporator air-cooler (cc) is then capable of handling the entire heat load alone. In other instances, the air can be cooled with the aid of the compressor cooling system.
The free-cold cooling system shall also be capable of functioning as a redundancy for the compressor system should said system fail. For instance, in the event of a power cut the system fans and liquid pump may be operated on batteries, via a rectifier or some like device. At the end of the power cut, the compressor cooling system can be restarted and the batteries recharged. It is also feasible to run both systems simultaneously under certain circumstances, so as to obtain an increased cooling effect.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a cooling system for cooling indoor air in accordance with the invention.
FIG. 2 illustrates an inventive cooling-controlling and monitoring system.
DETAILED DESCRIPTION
FIG. 1 illustrates schematically the main components of a cooling system, which may be incorporated in a single unit, for example in telecommunications equipment, having a combined condenser-liquid cooler 1 (EC) and a combined evaporator-air cooler 2 (CC). The Figure also shows how these components are mutually connected. The combined condenser liquid cooler 1 is eit
Telefonaktiebolaget LM Ericsson
Wayner William
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