Document 2jov23YMyJEa6xw73k48n784R

578 CHAPTER 31 1948 Guide - One type of room instrument consists of a blackened copper sphere of 6 or 8 in. in diameter, in which a cylindrical sump contains a volatile liquid. A small electric heating coil creates in the sphere a vapor pressure which remains constant as long as the total heat loss from the sphere is at the desired rate. If the Operative Temperature becomes too high for comfort, a greater vapor pressure results from the smaller heat loss from the sphere. This acts on a diaphragm and reduces the supply of heat to the'room. With too low an Operative Temperature the reverse action occurs. A similar instrument which has an electric heating element for warming the air inside the sphere and the thermostat operated switch is also used for controlling room conditions. In addition to a thermostatically controlled device for modulating the temperature of the circulating water, it is advantageous to insert in each coil a locked flow control or adjustable resistance to give uniform con ditions throughout all rooms. Owing to unforeseen difficulties with varying frictional losses in pipes, emission factor, and exposures, it is an advantage to be able to regulate permanently the flow through each circuit by means of a key operated valve as indicated in Fig. 4. REFERENCES >--Standard Operative Temperature, A Generalized Temperature Scale, Applicable to Direct and Partitional Calorimetry, by A. P. Gagge (American Journal Physiology. 1940. Vol. CXXXI, p. 93). *"The Influence of Air Movement Upon Heat Losses from the Clothed Human Body, by C.-E. A. Winslow. A. P. Gagge and L. P. Herrington (American Journal Physiology, 1939, Vol. CXXVII, p. 505). Surface Heat Transmission, by R. H. Heilman (AJS.M.E. Transactions, Puds and Steam Power Section, Vol. 51, No. 22, September-December, 1929). BIBLIOGRAPHY Trend Curves for Estimating Performance of Panel Heating Systems, by B. F. Raber and F. W. Hutchinson (A.S.H.V.E. Transactions, Vol. 48, 1942, p. 425). A.S.H.V.E. Research Report No. 1192--Panel Heating and Cooling Performance Studies, by B. F. Raber and F. W. Hutchinson (A.S.H.V.E. Transactions, Vol. 48, 1942, p. 35). A.S.H.V.E. Research Report No. 1193--Radiation as a Factor in the Feeling of Warmth in Convection, Radiator and Panel Heated Rooms, by F. C. Houghten, Carl Gutberlet and E. C. Hach (A.S.H.V.E. Transactions, Vol. 48, 1942, p. 55). Panel Heating and Cooling Analysis, by B. F. Raber and F. W. Hutchinson (A.S.H.V.E. Transactions, Vol. 47, 1941, p. 285). Operating Results of a Residence Radiant Wall Heating System, by E. J. Rodee (A.S.H.V.E. Transactions, Vol. 47, 1941, p. 123). Performance of a Residential Panel Heating System, by H. F. Randolph and J. B. Wallace (A.S.H.V.E. Transactions, Vol. 49, 1943, p. 235). Radiant Heating (Heating and Ventilating, March, 1941, p. 35). Radiant Heating and Cooling, by F. E. Giesecke .{Healing, Piping and Air Condi tioning, June, July, August, September and October, 1940). Calculations for Radiant Heating, by T. Napier Adlam {Heating and Ventilating, October, 1931). Radiant Heating and Cooling, Part I, by C. O. Mackey, L. T. Wright, Jr., R. E. Clark, and N. R. Gay {Cornell University Engineering Experiment Station, Bulletin No. 32, 1943). Design Method for Panel Heating Systems Using Copper Tubing, by R. G. Vanderweil (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, Nov. 1947, p. 123). Air Temperature Gradients in a Panel Heated Room, by J. M. Ayres and B. W. Levy (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, Oct. 1947, p. 113).' Graphical Solution of Radiant Panel Areas, by W. P. Chapman and R. E. Fischer {Heating and Ventilating, Jan. 1948, p. 88). Panel Heating and Radiant Heating 579 Embedding Coils in Radiant Heating Panels, by D. L. Mills and L. J. LaTart {Heating and Ventilating, Dec. 1947, p. 75). Radiant Heat with Copper Tubing, by D. L. Mills and L. J. LaTart {Heating and Ventilating, Nov. 1947, p. 95). Panel Heat with Copper Tubing--Experiment in Practice, by D. L. Mills and L. J. LaTart (Heating and Ventilating, Oct. 1947, p. 65). Experimental Studies on Panel Heating Tube Spacing, by B. F. Raber and F. W. Hutchinson (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, Aug. 1947, p. 111). Panel Heating--A Basic Discussion, by S. Konzo (American Artisan, Oct..1946, p. 68). Solar House Heated by a Warm Air Floor Panel, by John E. Peterson (American Artisan, Dec. 1946, p. 83). Design Data for a Warm Air Floor Panel, by Axel B. Algren (American Artisan, Jan. 1947, p. 141). The Mechanism of Heat Transfer, Panel Cooling, Heat Storage, by Charles S. Leopold (Refrigerating Engineering, July 1947, p. 33). Books Hot Water Heating, Radiant Heating and Radiant Cooling, by F. E. Giesecke, 1947 (Technical Book Co., P. O. Box 62, Austin, Tex.). Panel Heating and Cooling Analysis, by B. F. Raber and F. W. Hutchinson, 1945 (John Wiley and Sons, New York). Radiant Heating, by T. Napier Adlam, 1947 (Industrial Press, 148 Lafayette St., New York).