Refrigeration – Utilizing solar energy
Patent
1985-01-11
1986-05-06
Bennett, Henry
Refrigeration
Utilizing solar energy
62477, 622383, F25B 2700
Patent
active
045863458
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a system for the production of cold with an absorption cooling system comprising an evaporator positioned in a thermally insulated space to which evaporator a coolant is supplied in the liquid state from a condenser through a coolant vessel and from which evaporator coolant in the vapour state is sucked by an absorber which is designed as a solar collector and comprises a humidity absorbing compound for the suction of said coolant at night hours at a comparatively low temperature and delivery of said coolant in the vapour state to the condenser at day hours at a comparatively high temperature, said coolant suction and delivery to and from the absorber taking place through one and the same tube connection to the evaporator and the condenser.
The use of solar energy as an energy source has hitherto mainly been adopted for heating purposes whereby different types of solar collector systems has gained interest on an equal footing with other kinds of alternative energy sources, as far as solar collector systems are concerned particularly for the heating of water with respect to tap water in buildings as well as swimming pools and the likes. In connection with solar collector powered air condition systems it is known, however, to incorporate an air cooling into a total solution in connection with water heating by combining the solar collector system with an absorption cooling system.
Particularly in the hotter regions of the world and in places where the access to electric power and other conventional energy sources is difficult or expensive, there is a great and up till now badly fulfilled need for cooling systems for many different purposes. Thus, such demands may exist with respect to the cooling of food, pharmaceuticals and other products which do not stand storage at elevated temperature, as well as air conditioning of living rooms for living beings, including in particular residential rooms.
A solar energy powered cooling system of the kind mentioned is known in principle from DE-A No. 609,104. In this system, the humidity absorbing compound is accommodated in a tube coil in a solar collector unit arranged on the roof of the building and is connected with a condenser cooled by a cold accumulator incorporated in a separate self-circulating system so that cooled liquid is collected in the cold accumulator at night hours for cooling the condenser at day hours.
In conventional absorption cooling systems powered for instance by gas heating it is moreover known for instance from SE-A No. 88,723 and U.S. Pat. Nos. 1,955,612 and 2,130,503 to cool an absorber vessel by means of a separate self-circulating cooling system in which the circulation is interrupted at the start of the boiling period of the absorber by means of a valve which is closed at a predetermined temperature in the absorber, for instance by thermostatic control.
It is the object of the invention to provide a system for the production of cold of the kind referred to, utilizing solar energy as the only energy source so that no demands are put on access to electricity and gas or other conventional forms of energy supply, whereby a very high efficiency and thus a high cooling capacity relative to the solar collector efficiency may be obtained with a very simple design.
According to the invention, a system for the production of cold of the kind referred to is characterized in that the absorber comprises a number of parallel absorber tubes which are connected with said tube connection through a manifold, and each of which comprises said humidity absorbing compound in a direct thermal contact with parallel evaporator tubes of a secondary self-circulating cooling circuit positioned coaxially in said absorber tubes, a solar energy actuated blocking valve device being arranged in a coolant supply tube between a condenser and said evaporator tubes in said secondary cooling circuit.
Since the daily temperature variation i.e. the temperature difference between day and night hours may be utilized to energize a periodically operating abso
REFERENCES:
patent: 4034569 (1977-07-01), Tchernev
patent: 4184338 (1980-01-01), Bennett
patent: 4207744 (1980-06-01), Takeshita et al.
Friberg Svend
Korsgaard Peter
Worsoe-Schmidt Peder
Bennett Henry
Kaptan APS
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