Document g29MQ9rwQOoyYq2dMKyG9GeaJ

American Society of Heating and Ventilating Engineers Guide, 1932 Table 1. Inside Temperatures Usually Specified o?Ttpb Buildina Schools-- Class Rooms................................. Assembly Rooms.--..................... Gymnasiums................................. Toilets and Baths........................ Wardrobe and Locker Rooms._ Kitchens........................................ Dining and Lunch Rooms.......... Playrooms..................................... Natatoriums--............................... Theaters-- Seating Space_____ Lounge Rooms.___ Toilets...................... Hospitals-- Private Rooms....................... Private Rooms (surgical)___ Operating Rooms................... Wards_____ ........................... Kitchens and Laundries____ Toilets...................................... Bathrooms............................... Hotels-- Bedrooms and Baths.......... ............................................................................. Dining Rooms......................... .................................................................:...... Kitchens and Laundries.--.............................................................................. Ball Rooms.......... ............................................................................................. Toilets and Service Rooms.....................................................;...................... Homes-- Where 68 F is generally the desirable standard of temperature a guarantee of 70 F is customarily exacted. . : :' . Stores.......................................................... ................................. - ' Public Buildings.......................... Warm Air Baths.;......!_................. Steam Baths;................ ................... FACTORiES AND MACHINE SHOPS.. Foundries and Boiler Shops__ Paint Shops...................................... Deo. Fahr. 68 66-68 55-65 70 65-68 66 65-68 60-65 . 75 68-72 .68 68 . . 70 70-80 70-95 68 66 68 70-80 70 70 66 65-68 68 65-68 68 - 70 120 110 60-65 50-60 80 Table 2. Desirable Indoor Temperatures in Summer Corresponding to Outdoor Temperatures Degrees Outbids Dry Bulb '95 90 85 80 75 70 Dry Bulb ` 80.0 78.0 76.5 75.0 73.5 72.0 Degrees Inbidb Wet Bulb 65.2 64.5 64.0 63.5 63.0 62.5 Effective Temperature 73.4 72.2 71.1 70.2 69.3 68.2 , ' Chapter 2--Estimating Heat Losses 2. Determine on an outside air temperature for design purposes, based on the minimum temperatures recorded in the locality in question;,which will provide for all but the most severe weather conditions. Such conditions as .may exist for only a few consecu tive hours are readily taken care of by the heat capacity of the building itself. (See Table 3, p. 14). 3. Select or compute the heat transmission coefficients for outside walls and glass, also for inside walls, floors, or top-floor ceilings, if these are next to unheated space; include roof if next to heated space. (See Chapter 3). 4. Measure up net outside wall, glass and roof next to heated spaces, as well as any cold walls, floors or ceilings next to unheated space. .Such measurements are made from building plans, or from the actual building. 5. Compute the heat transmission losses for each kind'of wall, glass, floor, ceiling and roof in the building by multiplying the heat transmission coefficient in each case by the area of the surface in square feet and the temperature.;difference between the inside and outside air. (See pars. 1 and 2). 6. Select unit values and compute the heat equivalent of the infiltration of cold air taking place around outside doors and windows. These unit values depend on the kind or width of crack and wind velocity and when multiplied by the length of crack and the temperature difference between the inside and outside air, the result expresses the heat required to warm up the cold air leaking into the building per hour. (See Chapter 4). 7. The sum of the heat losses by transmission (par. 5) through the outside wall and glass, as well as through any cold floors, ceilings or roof, and the heat equivalent (par. 6) of the cold air entering by infiltration represents the total heat loss equivalent for any building. Item 7 represents the heat losses after the building is heated and under stable operating conditions in coldest weather. Additional heat is required for raising the temperature of the air, the building materials and the material contents of the building to specified standard inside temperature. The rate at which this additional heat is required depends upon the heat capacity of the structure and its material contents and upon the time in which these are to be heated. This additional heat may be figured and allowed for as conditions re quire, but inasmuch as the heating system proportioned for taking care of the heat losses will usually have a capacity about 100 per cent greater than that required for average winter weather, and inasmuch as most buildings may either be continuously heated or more time be allowed for heating-up, during the few minimum temperature days, no allowance is made except in the size of boilers or furnaces. INSIDE TEMPERATURES Winter The inside air temperature which must be maintained within a building and which-should always be stated in the heating specifications, is under stood to be the temperature at the breathing line, 5 ft above the floor and not less than 3 ft from the outside walls. Inside air temperatures, usually specified, vary in accordance with the use to which the building is to be put and Table 1 presents values which are in conformity with good practice. .. Effect of Humidification: In connection with inside temperatures for winter where humidifying means are provided, approximately 1 deg vari ation for. each 10 per cent variation inTelative humidity should be pro vided. For example: If the relative humidity is raised from a condition of 15 per cent to one of 45 per cent by artificial humidification it is-desirable 11