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History: 1946 – 1969 Cooling Load Calculation Other Developments: p. CLTD CLF EnergSy SoysutermcseLa:bo1ra9to7ry7© A201S0 HRAE Handbook p. History: 1970 – 1989 Cooling Load Calculation CLDT/CLF permitted hourly estimations of heat gain for each surface/orientation, opaque/fenestrations = Totalized by zone. History: 1970 – 1989 Cooling Load Calculation In 1977 TETD/TA replaced with CLTD/CLF Method:  Firstly developed by Rudoy and Duran in 1974 and published by ASHRAE Transactions  Later appeared in 1977 ASHRAE handbook Source: 1977 ASHRAE Handbook Roof, Wall, Glass: q  UA(CLTD) Mcquiston and Paker, Heating and Ventilating, and Air ConditioningEnergy Systems Laboratory © 2010 Analysis and Design Solar: q  A SC  SHGF CLF Internal Lights: q  INPUT CLF People: q  No. Sens.H.G.CLF p.

55  1961 TETD/TA Method:  Total Equivalent Temperature Difference/Time Averaging Method  Original Outlined by Stewart in 1948  TETD table added to ASHRAE Guide and Data Book in 1961 Basic heat gain equation for exterior surface: q  UA(TETD) Thermal mass is in the TETD ESneorguyrScysete:m1s L9ab6or1atoAry S©H201R0 AE Guide and Data Book- Fundamentals and Equipment History: 1946 – 1969 Cooling Load Calculation Peak Cooling Load Calculation: p. History: 1946 – 1969 Guide Books Guide Books: 1955 TRANE Air Conditioning Design Manual 1960 Handbook of Air Conditioning System Design by Carrier 1961 ASHRAE Guide and Data Book 1967 ASHRAE Handbook of Fundamentals 1955 1960 1967 Energy Systems Laboratory © 2010 p. History: Pre 1945 – Cooling Load Calculation In the 1967 ASHRAE Handbook, the Sol-Air Temperature table was further modified: A heat balance at a sunlit surface gives: q / A  It  ho (to  ts )  R In terms of the sol-air temperature, te q / A  ho (te  ts ) where, te  to It / ho  R / ho Source: 1967 ASHRAE Handbook of Fundamentals p. Source: 1961 ASHRAE Guide and Data Book – Fundamentals and Equipment p.

History: Pre 1945 – Cooling Load Calculation 1961 ASHRAE Guide and Data Book – Fundamentals and Equipment – Total Equivalent Temperature Difference tabulated in the Handbook The curves shown in Mackey and Wright and ASHRAE original test data were finally tabulated in the ASHRAE Guide and Data Book Energy Systems Laboratory © 2010 There is time lag for the peak and a reduction in amplitude. History: Pre 1945 – Cooling Load Calculation 1961 ASHRAE Guide and Data Book – Fundamentals and Equipment – Total Equivalent Temperature Difference tabulated in the Handbook Energy Systems Laboratory © 2010 There is time lag for the peak and a reduction in amplitude.