Journal of Glaciology
139 the water temperature up to a maximum of 100 0 C. between 10 p.m. and 6 a.m. To gain space by the elimination of radiators and pipes in the offices a heating system by radiation from the ceilings was adopted at the suggestion of the firm of Sulzer. A system of hot-water pipes is embedded in the concrete and helps in its reinforcement. The refrigeration of the four laboratories is as follows: A centrifugal ammonia compressor "Frigoroto Sulzer" of 8200 kg.-cal. /hr. cools a large tank of
... large tank of brine to -24 0 C. The heat is dissipated into the air outside the building by a ribbed condenser. The brine is pumped through pipes suspended from the ceilings of the two large laboratories ( -50 and -100 C.), the rate of flow being thermostatically controlled. The two smaller Iow-temperature laboratories are cooled by separate two-stage refrigerators "Therma Kiihlautomat" to -20 0 and -400 C. respectively. Here there is no brine storage, the freon evaporators being inside the cabins. The two evaporators are fed from a single condenser immersed in the brine tank cooled by the large Sulzer refrigerator. The two-stage refrigerators are small and economical owing to the Iow condenser temperature. The temperature control in all the laboratories is fully automatic, giving a variation of approximately 2 0 C. During the cold midwinter days the laboratories will soon be capable of being cooled by the admission of outside air. There will also be an installation for defreezing in order to remove the hoar which accumulates on the refrigerating system.