Document DD7BEG6o6eKknrNkM5JgZ7qgn

.256 CHAPTER 14 1949 Guide 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, F ig . 1. s o th e r m s o f W in t e r O u td o o r D e s ig n T e m p e r a t u r eI 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 20 per cent or less. Consequently, in using the figures listed in Table 2, consideration should be- given to the actual relative humidity to be maintained, if provision is to be made for humidifi cation. If no humidification is to be provided',, the higher temperatures may not even produce comfort on cold days; if humidity is to be main tained at 50 per cent the lower temperatures will apply. . ; In rooms having large glass areas, when sun is not shining, or in rooms with walls having a high transmission coefficient, the lowered surface tem perature will cause a feeling of coolness even though the air temperature in the room is at or above the temperatures indicated in the table. In rooms Table 2.. Winteb Inside Dby-Bulb Temperatures Usuallt Specified* Type of Building Dec F Type of Building Deg F Schools-- Class rooms............. .................. Assembly rooms------------- ------Gymnasiums.------- ------ ---------- Toilets and bathsL_________-- Wardrobe and locker rooms.... Kitchens....................-------- -Dining and lunch rooms... ...... Playrooms--------------------------Natatoriums.------------------------ Hospitals-- Private rooms.--------------------- :. Private rooms (surgical)-------- Operating rooms-------------- Wardsi..... ............. -- Kitchens and laundries-------- Toilets:---------------------------------- Bathrooms................ -- 70-72 68-72 55-65 70 . 65-68 66 65-70 60-65 75 70-72 70-80 70-95 68 66 68 70-80 Theaters-- Seating space... :.......... ........ Lounge rooms............ .......................... Toilets........... ................................. Hotels-- Bedrooms and baths..... ................. Dining rooms...................................... Kitchens and laundries................ Ballrooms.______ ;__________________ Toilets and service rooms........... Homes. .................. ..... .................... Stores____ ________________________ ___ Public buildings..________________ Warm air baths.____________ ;______ Steam baths____ Factories and machine shops.. Foundries and boiler shops..:. Paint shops______________ :___ :______ 68-72 68-72 63 70 70 66 65-68 68 70-72 65-68 68-72 120 HO 60-65 50-60 80 * The most comfortable dry-bulb temperature to be m&mtaiood depends on the relative humidity and air motion. ' These three factors considered together constitute what is termed the effective temperature (See Chapter 12.) VYhenrelative humidity is not controlled separately, optimum dry-bulb temperature for comfort will be slightly higher than shown in Table 2. of this character, it is desirable to design for even higher temperatures than those listed, unless a counter-acting, high temperature surface is installed to offset, the low temperature surfaces: The inside temperatures specified in Table 2 will not necessarily apply to panel heated rooms due to the fact that the panels usually maintain a higher wall or glass surface temperature, thus producing comfort at lower air temperatures. Temperature at Proper Level: In making the actual-heat , loss compu tations, however, for the various rooms in a building it is often necessary to modify the temperatures given in Table 2 so that the air temperature at the proper level will be used. ` By air temperature at the proper level is meant, in the case of walls, the air temperature at the mean height be tween floor and ceiling; in the case of glass, the air temperature at .the mean height of the glass; in the case of roof or ceiling, the air temperature