Handbook for heating and ventilating engineers . vering it to the rooms. The troublesomecoating of ice and frost on the pipes may be avoided bycombining the cooling system with the air washing systemand using a brine spray instead of water for washing theair during cooling. The brine, which freezes at a very lowtemperature compared with water, plays over the coolingcoils, and cleans both coils and air. The brine should pref-erably be a chloride brine. A modification of this method ofavoiding ice and frost is to provide pans above the coilsand fill them with lumps of calcium chloride. The pansh
Handbook for heating and ventilating engineers . vering it to the rooms. The troublesomecoating of ice and frost on the pipes may be avoided bycombining the cooling system with the air washing systemand using a brine spray instead of water for washing theair during cooling. The brine, which freezes at a very lowtemperature compared with water, plays over the coolingcoils, and cleans both coils and air. The brine should pref-erably be a chloride brine. A modification of this method ofavoiding ice and frost is to provide pans above the coilsand fill them with lumps of calcium chloride. The panshave perforations so arranged that as the strong chloridesolution forms (due to the deliquescence of the salt) ittrickles down oyer the pipes and holds the freezing pointof any collecting moisture far below the temperature of thecoils. ;A sketch of this arrangement is shown in Fig. 149,which has the disadvantage of the clumsy handling of thecalcium chloride. Plants operating only during the day, as for 306 HEATING AND VENTILATION ORlOC OF OILOUM. FIgr. 149. Instance, auditoriums, commerce chambers, etc, often haveno equipment for preventing the accumulation of frost andice, it being allowed to form during the short period of useand to melt during the period of rest. 208. Pipe Line Refrigeration:—In a number of thelarger cities refrigeration is furnished to such places ascold storage rooms, restaurants, hotels, auditoriums, etc.,by a conduit system or central station system. The lengthof the mains in the various cities where used, ranges froma few hundred feet to twenty miles and the circulatingmedium employed is either liquid ammonia or brine. In theammonia system two pipes are used, one carrying the liquidammonia to the place desired and the other returning itafter expansion to the central station. When brine is u?edIt is good practice to circulate it at froml2 to 15 degrees the conduits carry three parallel pipes, two ofwhich are for circulating the brine and
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