. Principles and practice of plumbing . erage temperature of the water in theice chest as 42 degrees Fahrenheit, then it is only about tendegrees warmer than the temperature of the ice, and thatten degrees heat, or the greater portion of it no doubt, wasabsorbed from the drinking water passing through the coils. The waste and overflow connections are so arrangedthat water can be retained in the ice box up to the level ofthe overflow, and the water then overflowing is from thebottom of the ice box, where the warmest water will befound, or, byopening thevalve in thewaste pipe,the water willdrain
. Principles and practice of plumbing . erage temperature of the water in theice chest as 42 degrees Fahrenheit, then it is only about tendegrees warmer than the temperature of the ice, and thatten degrees heat, or the greater portion of it no doubt, wasabsorbed from the drinking water passing through the coils. The waste and overflow connections are so arrangedthat water can be retained in the ice box up to the level ofthe overflow, and the water then overflowing is from thebottom of the ice box, where the warmest water will befound, or, byopening thevalve in thewaste pipe,the water willdrain ou t asfast as the icemelts. In p r o-portioningtheice box, aboutthree cubicfeet of spaceshould be al-lo w ed foreach drinkingfountain to be served. Indeed, it would be well to allow slightly morespace to take care of the ice needed in extremely hotweather, then the cooling of water can be regulated in ordi-nary weather by not using so much ice. The amount of icej-equired will of course depend upon the weather- Qrdina,v- •Su/lfi/jTj. Fig. 140Cooliug Tank for Ice Water Supply Digitized by Microsoft® 314 Principles and Practice of Plumbing ily, 50 pounds of ice per day for each fountain will be foundsufficient, although in excessively hot weather it mightrequire over three times that amount. Cooling Coils.—In the foregoing illustration, the pipecoil is shown occupying the main part of the tank. This isnot necessary, however, and other methods are oftenresorted to. For instance, a flat coil may be laid on thebottom of the ice tank, or wall coils, may be run around thesides of the tank thereby keeping them out of the way of theice, so they will not be damaged when putting the ice in thebox, and at the same time permitting a smaller size of tankto be used. When a bottom coil is used, it is well to fasten over thecoil a rack or grating of heavy timbers, say 21/2 x 5, to keepthe ice from coming in contact with the coils and possiblydamaging them. Size and Material of Cooling Coi
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