Document x53YLVM0vrkLg753B9jZObDpg

260 - CHAPTER 14 -- 1946 Guide 103* __ 07* 91* F ig . i . D esign1T emperature Z one M ap Heating Load 261 of the hours in December, January, February, and March, but the work of compiling the various local temperatures is not yet completed. INSIDE TEMPERATURES The inside air temperature which must be maintained within a building is understood to be the dry-bulb temperature at the breathing line, 5 ft above the floor, or the 30-in. line, 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 2 presents values which conform to good practice. Table 2. Winter Inside Dry-Bulb Temperatures Usually Specified3 Type of Building Dbg F Type of Building Dbg F Schools-- Assembly rooms--:---------------Gymnasiums. ---- ----------Toilets and baths-------------- --- Wardrobe and locker rooms..-.. Dining and lunch rooms. Playrooms__ - . -- -- Natatoriums-------- :---------------- 70-72 68-72 55-65 70 65-68 66 65-70 60-65 75 Hospitals-- Private rooms (surgical)_____ Wards__ . - -- _____ ' Toilets__ ___ _ _____ Bathrooms._-..........-.......... ... 70-72 70-80 70-95 68 66 68 70-80 Theaters^- ^ Lounge rooms____ ____________ Toilets. ___ ________ _ 68-72 68-72 68 Hotels-- Dining rooms.________________ Kitchens and laundries__:____ Ballrooms__________1_________ Toilets and service rooms........ 70 70 66 65-68 68 Stores___ '.............................. Warm air baths. Factories and machine shops.. Foundries and boiler shops__ Paint shops.___________________ 70-72 65-68 68-72 120 .110... 60-65 50-80 80 The most comfortable dry-bulb.temperature to be maintained depends on the relative humidity and air motion. These three factors considered together constitute what is termed the effective temperature. (See Chapter 12.) When relative humidity is not controlled separately, optimum dry-bulb temperature, for comfort will be slightly higher than shown in Table 2. .- - The proper dry-bulb temperature to be maintained depends upon the relative humidity and air motion, as explained in Chapter 12. In other words, a person may feel warm or cool at the same dry-bulb temperature, depending on the relative humidity and air motion! The optimum winter effective temperature for sedentary persons, as determined at the A.S.H.V.E. Research-Laboratory, is 66 deg. As explained in Chapter 12 for-so-called still air conditions, a relative, humidity of approximately 50 per cent is required to produce, an effective temperature of 66 deg when the dry-bulb temperature is 70 F. However, even where provision is made for artificial humidification, the. relative humidity is seldom maintained higher than 40 per cent during the ex tremely cold weather, and where no provision is made for humidification, the relative humidity may be 20per cent or less. Consequently, in using the figures listed in Table 2, consideration should be given to whether provision is to be made for humidification and, if so,, the actual-relative humidity toibemaintained,, . .. Temperature at Proper Level: - In making the actual heat loss compu tations, however, for the various rooms in a building it is often necessary