Document Yrop1xDv9qb9J28NBykg8OVVE

256 CHAPTER 11 1952 Guide - '- * An" Analysis; of Winter Temperatures for One' Hundred and Twenty Cities, by Clark M. Humphreys (Carnegie Institute , of Technology/Bulletin 1939). Investigation Of Oil-Fired Forced Air Furnace Systems in the Research Resi dence, by A. P. Katz and S. Jtonzcf (University of Illinois Engineering Experiment Station Bulletin Nb.:8lS).'-'-Huu > 4 Performance of a Hot-Water Heating System in the I=B = R Research Home at the University of Illinois, by A. P. Kratz, W. S. Harris, M. K. Fahnestock, and R. J. Martin (University ofIllinois Engineering Experiment Station Bulletin No. 349). '* A, Study of Radiant Baseboard Heating in the I=B=R Research Home, by A. P. Kratz and W. S. Harris (Engineering Experiment Station Bulletin No, 358). ? Performance of a One-Pipe Steam'System in the I=B=R Research Home, by W. S. Harris (University of Illinois Engineering Experiment Station Bulletin No. 383); : 7 A.S.H.V.E. Research Report No. 1011--Tests of Three Heating Systems inan Industrial Type of.Bujlding, by G. L. Larson, X). W. Nelson, and John James;. (A.S,H,V.E. Transactions, Vol. 41, 1935, p.185). - * Methods of' Moisture Control and Their Application to Building Construction, by F. B. Rowley, A. B. Algren and C. E. Lund (University of Minnesota, Engineering Experirnent Station. Bulletin No, 17}., ... 9 AiS.H.V.E . Research; Report No . 1213--Heat Loss-Through Basement Walls and Floors, by F. C. Houghten, S. I. Taimuty, Carl Gutberlet and C. J. Brown (A,S>H.Y.E,TKANSAcrioNSj Vol. 48, 1942, p: 369). 19 Measurements of Heat Losses from Slab Floor, by R. S. Dill, W. C., Robinson and H. E. Robinson (U, S. Department of .Commerce, National Bureau of Sgandards, Building Materials and Structures Report BMS 103).. 11 Temperature and Heat. Loss Characteristics of Concrete Floors Laid oh the Ground, by H.D. Bareither, A. N. Flemming and B. E, Alberty (University ofIllinois, Small Homeh Council Technical Report). '[ 11 Concrete Floors fbr Basementless Houses (University of Illinois, Small Homes Council Circular No. F.4.3). 19 Heat Requirement Tables for Intermittently Heated Buildings (Engineering Experiment Station Bulletin No. 60, A. arid M. College of Texas, .College Station, Texas) contains a .set of tables.applicable.to.either intermittent heating or cooling. Further' information`may be'found'in' a`paper, A Method of Compiling Tables for Intermittent Heating, by, Elmer G. Smith (A.S.H.V.E: Journal Section,Heeding, Cluing and Air Conditioning, Juno 1942, p. 386). CHAPTER 12 COOLING LOAD Cooling Load Calculations; Design Conditions; Instantaneous Heat Load; Solar Ra diation; Periodic Heat Flow; Tables for Calculating Solar Heat Gain Through Walls, Roofs and-Glass; Instantaneous Heat Gainya. Cooling Loads; Load - : from Interior-Partitions, Ceiling and Floors; Load from Outside Air, Ventilation and. Infiltration;:Effect of 0.utside; Air- on Loadj Heat Sources Within Conditioned Space; Moisture Transfer Heat Load; Miscellaneous Heat Loads; Required Air Quantity Through Conditioning Equipment; Minimum Entering .. . . Air Temperature; Example Cooling Load Calculation ' ' '" " THE variables affecting cooling-load calculations are riumerous, often difficult to define precisely, and always intricately inter-related. Most of the components,of the cooling load vary in magnitude;.over a wide range during a 24-hour period, and , as the cyclic changes in'load coinponents are not usually in phase with each other, careful analysis is re quired to establish the resultant maximum, cooling load for a building or zone. A zoned system must often handle peak loads in different zones at different hours. Economic considerations must be of particular influence in the selection of equipment for cooling season operation in comfort air conditioning, and this fact," coupled with present inadequacies in available data.and knowl edge of the air-conditioning art, places a.preinium on the" experienced judg ment essential to successful design or practice. Variations in the weather, building occupancy, and other factors, affecting load, necessitate carefully coordinated controls to regulate simultaneously the components and the equipment in order to maintain the desired room conditions. "' l" The calculation procedures presented in this chapter deal with the vari ous instantaneous rates of heat.,gain, both sensible and latentj in a condi tioned space. There may be" an appreciable difference between the net instantaneousrate of heal gain and the (6tal cooling load at any mlfaht. This difference is caUsed by the storage and subsequeht ireleAse of heat by the structure and its contents.' This thermal-storage effect may be quite im portant in determining ah economical cooling equipment capacity. The lack of any adequate means of treating this storage quantitatively in its entirety for a complete structure', must be. recognized'in judging the pro cedures and data presented for calculating individual components of the net rate of instantaneous heat gainl ' :; Solar healing calculations involve the same principles as codling load calculations.. Many, of the data on solar radiation given in this chapter can be used in calculations for solar.heating. /' COOLING LOAD; CALCULATIONS Summer cooling load calculations, whether for industrial or comfort . applications, require consideration of the following factors: A. Design Conditions: (1) indoor conditions; (2) outdoor conditions; (3) venti lation rate. ' ' B. Instantaneous Heat Load, Sensible arid Latent: (1) load from solar radiation, 257