Document 8Ryo2NxRyx8wGeqNNnq4V61oe

[ `1 ! * ?' Ht ^ i (^. 5. I>eyWmeni o/Commerce, Notionai,Bt*raii o/Building Materials and Structures Report iRr BUS 103). ' ' ' ... .- , : ... , u Teinperature and Heat Loss Characteristics of Concrete Floors Laid on tteGroubd, by H. D. B&reither, A, A. N. Flemming and B.'E. Albert?' {UniBersity af Illinois, Small,Homes Council Technical-Report). .** Concrete. Floors for Basementlesa Houses {University'of Illinois, Small Homes Council Circular No. -tf* a Wartn-Air Perimeter Heating, Part III--Heat Losses from Floor Siab.byi.R. Jamieson, R. W. Resists Fan4d.3S).. Konzo. (A.S.H.V-.E.*JouRNAL'SEcnbN, Heating, Piping and Air Conditioning, Feb. 1052, p. 12S). M Warm-Air Perimeter Heating--Manual 4, National Warm Air Heating and Air Conditioning Association. " Heat Requirement Tables - for. Intermittently. Heated Buildings. (Engineering Experiment Station Bulletin No. 60, A. andM. College of Texas, College Station, Tessa) 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, Heating, Piping and Air Conditioning, June 1942, p;!386). CHAPTER 13 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 Gain vs. Cooling Loads; Load from Interior Partitions, Ceiling arid Floors; Load from Outside Air; Ventilation ind Infiltration; Effect of Outside Air on Load; Heat Sources Within Conditioned Space; Moisture Transfer Heat Load; Miscellaneous Heat Loads; Apparatus Dew-Point and Required Air Quantity Through Conditioning Equip ment; Minimum Entering Air Temperature; Ex ample Cooling Load Calculation }[' ' "*K * L <* St J&. r' : THE variables affecting cooling-load calculations are numerous, 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 com ponents 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 premium 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. The calculation procedures presented in this chapter deal with the vari ous instantaneous rates of heat gain, both sensible and latent, in a condi tioned space. There may be an appreciable difference -between the net instantaneous rate of heat gain and the total cooling load :at any instant. . This difference is caused by the storage and subsequent release of heat by the structure and its contents.. This thermal-storage effect may be quite im portant in determining an economical cooling equipment capacity. The ack of any-adequate means of treating this storage quantitatively in its e"*lrety 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 gain. Solar heating calculations involve the same principles as cooling load calculations. Many of the data on solar radiation given in this chapter can be used in calculations for solar heating. COOLING LOAD CALCULATIONS a y.nirner cooling load calculations, whether for industrial or comfort PPlications, require consideration of the following factors: ation raU;9" ^'on^^ms: 0) indoor conditions; (2) outdoor conditions; (3) venti- instantaneous Heat Load, Sensible and Latent: (1) load from solar radiation, 265