1. Field of the Invention
Absorption refrigeration systems having means for automatically controlling the energizing medium.
2. Description of the Prior Art
In U.S. Pat. No. 3,895,499 issued to N. E. Hopkins on July 22, 1975, there is described an absorption refrigeration system in which the cooling tower water is essentially uncontrolled and allowed to vary as influenced by the temperature of the ambient air flowing through the cooling tower in contact with the water spray devices. In the Hopkins system, the heat input to the generator is controlled in response to the entering or leaving chilled water temperature as is conventional in absorption machines. The basic concept embodied in the Hopkins system is a means for transferring solution from one point to another to prevent a dangerous operating condition.
In U.S. Pat. No. 4,164,128 issued to A. B. Newton on Aug. 14, 1979, there is described an absorption refrigeration system which is adapted to be powered by solar energy or a source of relatively low temperature waste heat. A control system automatically adjusts the maximum energizing temperature as the temperature of the cooling water and the temperature of chilled water supplied to the load vary from time to time.
An article by A. B. Newton entitled "Optimizing Solar Cooling Systems", ASHRAE Journal, November 1976, pp. 26-31, suggests that plural compartments for the storage of heated medium at different temperatures may be used in a solar powered absorption system. No specific means are described for controlling the selection of the storage compartments.