Control of a Rankine Chiller and an Absorption Chiller in the National Security and Resources Study Center

摘要

The National Security Resources Study Center (NSRSC) at Los Alamos, New Mexico, has 60,000 ft exp 2 of air-conditioned space, solar heated and cooled with an 8000 ft exp 2 array of flat-plate collectors. The collectors have a selective surface of black chrome and are single glazed with water-white glass. A paraffinic oil is used as the collector coolant, transferring heat to water through a heat exchanger. In the cooling mode, hot water is stored in a 5000 gallon pressurized tank and chilled water is stored in a 10,000 gallon tank. Two water chillers are installed in the system: a York lithium-bromide absorption unit (ESIA2), derated to 85 tons with 185 exp 0 F water, and a Rankine cycle unit designed and fabricated by Barber-Nichols, rated at 77 tons with 200 exp 0 F water. The chillers are installed in series with the 10,000 gallon cold storage tank. The mean daily values of measured energies in the NSRSC for 1978 are given. The percent solar cooling measured for the 1977 cooling season is August, 73 percent, and September, 92 percent. Observations on the system indicate that very little auxiliary energy is now used due to optimum management of solar energy and cold storage. (ERA citation 04:007734)