Document omZp3KEBq0oDZk4pLoMeaG717

234.CHAPTER 12______________________________________________ . . . 1946 Guide A.S.H.V.E. Research Laboratory ** shows that they may be made reason ably. comfortable by blowing relatively small volumes of slightly cooled air over them or through their clothing. For prematurely born infants, the optimum temperature varies from 100 to 75 F, depending upon the stage of development. The optimum relative humidity for these infants is placed at 65 per cent **. No data are yet available on the optimum air conditions for full term infants and . aCurve .4--Persons working so aa to have a metabolic rate.of 1310 Btu per hour. Carve il--Persons working; so as to have a metabolic,rate q{ 850 Btu per-hour. Curve C--Persona working so.as to have a metabolic rate of 860 Btu per hour.Curve Persons seated at rest, or with a metabolic rateof400Btu per hour. Curves B and D based on test data covering a wide,temperature range. Curves A and C based * oatest'data at an Effective Temperature of 70 deg and extrapolation of Curves B and D.r All curves are averages ofi values for hi^h and low relative humidities which apply with satisfactory accuracy for most considerations.-, For special problems requiring a higher degree of accuracy see more detailed A.S.H.V.E, Research Laboratory reports.. young children tip to school age. Satisfactory air conditions for"these age groups.are assumed to vary from 75 to 68F with natural indoor humidities. For children (haying, high, metabolism) at school, in winter clothes, 70-E has. been; amsidered correct, while in a gymnasium 55 F has been recom'mended.'. A great number of persons seem to be fairly content in.summer ' with a higher plane of, indoor, temperature, particularly when the matter ^ of.first.,cost and operating cost of a cooling plant is given due consideration... . Studies, by the. University of Illinois 57 in cooperation with;the A.S.;H.V.E, Committee on; Research indicate that effective temperatures i . as; high;as 74.5 deg, are acceptable in the living quarters of a. residence, and while, this condition, is not representative of optimum comfort it