Refrigeration – Utilizing solar energy
Patent
1990-01-02
1991-02-19
Makay, Albert J.
Refrigeration
Utilizing solar energy
622383, 62477, 62481, 16510412, F25B 2700
Patent
active
049932349
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a solar collector absorption cooling system with a primary cooling circuit the evaporator of which is connected with absorber ducts in an absorber formed as a solar collector and positioned in a solar collector frame beneath and in parallel to a glass layer facing the incident sun, a thermal insulating layer being provided on the opposite side of the absorber, said absorber ducts including a coolant absorbing compound for the suction of coolant at night hours, and a secondary self-circulating cooling circuit with evaporator ducts connected to a condenser and located in heat transferring contact with the absorber ducts of the primary circuit, said secondary circuit being selectively operable to provide an enhanced cooling of the absorber ducts during the absorption process.
The exploitation of solar heat as an energy source has hitherto mainly been adopted for heating purposes, whereby different types of solar collector systems have 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 and for swimming pools and the like. In connection with solar 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 cold producing systems for various different purposes. Thus, such requirements exist with respect to the cooling of foodstuffs, pharmaceuticals and other products which do not stand storage at an elevated temperature, as well as air conditioning in living rooms for living beings, including particularly residential rooms.
An absorption cooling system of the above mentioned type is known from international patent application No. PCT/DK84/00040, publication No. WO 84/04581, in which the solar heat is exploited as the sole energy source so that no demands are made on access to electricity and gas or other conventional forms of energy supply. The mode of operation of such a system is based on the utilization of the daily temperature variation, i.e. the temperature difference between day and night hours, to energize a periodically operating primary absorption cooling system, thereby causing the evaporation of coolant in the thermally insulated space accomodating the evaporator of the system, to take place at night hours during which the absorber is not exposed to solar energy. By means of the secondary self-circulating cooling circuit the coolant absorbing compound, e.g. calcium chloride, contained in the absorber tubes efficiently absorbs substantially the total amount of coolant prevailing in the primary circuit during the cooling period.
At the beginning of day hours the secondary circuit is interrupted and the absorber tubes are rapidly heated to a temperature at which they can no longer retain the absorbed coolant quantity which is expelled to the condenser of the primary circuit from which coolant in the liquid state is transferred to the coolant vessel of the primary circuit, said vessel collecting during day hours substantially the entire coolant quantity and retaining it until the evaporation starts again as a result of coolant absorption in the absorber tubes.
To obtain a good heat transferring contact between the coolant absorbing compound in the absorber tubes of the primary circuit and the evaporator tubes of the seconday circuit it is prescribed as regards the above mentioned cooling system that the latter evaporator tubes must extend coaxially within the absorber tubes in direct heat transferring contact with the coolant absorbing compound in the form of so-called finned or ribbed tubes dividing the absorber tube into a number of compartments to ensure an
REFERENCES:
patent: 4586345 (1986-06-01), Friberg et al.
patent: 4697433 (1987-10-01), Paeye
Henry Soby A/S
Makay Albert J.
Sollecito John
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