Heating and ventilating buildings : a manual for heating engineers and architects . ie .14• 13 LOSS OF HEAT THROUGH STONE WALLS. Total Thickness, Inches. Sandstone,A. Limestone,A. Total Thickness, Inches. Sandstone,K. Limestone,K. 121620 2428 •39•35• •43•38•35•3i 323640 44 48 • • 68 HEATING AND VENTILATING BUILDINGS. These coefficients are to be increased respectively as fol-lows, as stated by Rietschel : Ten per cent where the exposure is a northerly one and the windsare to be counted on as important factors. Ten per cent when the building is heated
Heating and ventilating buildings : a manual for heating engineers and architects . ie .14• 13 LOSS OF HEAT THROUGH STONE WALLS. Total Thickness, Inches. Sandstone,A. Limestone,A. Total Thickness, Inches. Sandstone,K. Limestone,K. 121620 2428 •39•35• •43•38•35•3i 323640 44 48 • • 68 HEATING AND VENTILATING BUILDINGS. These coefficients are to be increased respectively as fol-lows, as stated by Rietschel : Ten per cent where the exposure is a northerly one and the windsare to be counted on as important factors. Ten per cent when the building is heated during the daytime only,and the location of the building is not an exposed one. Thirty per cent when the building is heated during the daytime only,and the location of the building is exposed. Fifty per cent when the budding is heated during the winter monthsintermittently, with long intervals (say days or weeks) of non-heating. Mr. Wolff has arranged the results in a graphical form (), so that the values for heat losses can be obtained by 20 bO .40 50 GO 70 SO 90 100 110 120 130 Fig. 24.—Wolffs Diagram of Loss of Heat from Walls. In this diagram distance in horizontal direction is the required difference in temperature between that of the room andthe outside air; the various diagonal iines correspond to th&different radiating surfaces of the building, floors, ceiling, doors, AMOUNT OF HEAT REQUIRED FOR WARMING. 69 windows, etc. The heat transmitted per square foot ofsurface per hour is given by the numbers in the verticalcolumn. The German Government require computations to be made on thefollowing assumed lowest temperatures:* External temperature 4° Fahr. Assumed lowest temperature of non-heated cellarand other portions of building permanently non-heated 32 Vestibules, corridors, etc., non-heated, and at fre-quent intervals in direct contact with external air 23 I Metal and slate roofs. . 14 Air-spaces between roof j Denser methods
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