American Society of Heating and Ventilating- Engineers Guide, 1937 cfm 200 X 13.5 (30.85 - 20.35) 257 cfm per ton. 257 X (76.0 - 14.4) X 1044 175.2 Btu. 13.5 X 7000 )Check: L = 200 - / 257 \ X 0.2415 13.5 X 5 177.0 Btu. 9 Why is it possible for a reversed cycle refrigeration unit to show a better . performance in heating operation than when operating during the cooling season?

1 American Society of Heating and Ventilating Engineers Guide, 1937 HEAT TRANSFER COEFFICIENTS The symbols representing the various coefficients of heat transmission and their definitions are as follows: U = thermal transmittance or over-all coefficient of heat transmission; the amount o| heat expressed in Btu transmitted in one hour per square foot of the wall, floor, roof or ceiling for a difference in temperature of 1 deg F between the air on the inside and that on the outside of the wall, floor, roof or ceiling. k <= thermal conductivity; the amount of heat expressed in Btu transmitted in one hour through 1 sq ft of a homogeneous material 1 in. thick for a difference in temperature of 1 deg F between the two surfaces of the material.

American Society of Heating and Ventilating Engineers Guide, 1937 5 Is heat loss by infiltration through walls of importance?

American Society of Heating and Ventilating Engineers Guide, 1937 standard of heating effect allowances for various enclosure heights to be included in the ratings by its members.

.

American Society of Heating and Ventilating Engineers Guide, 1937 Needham-- Park, C.

Heating Ventilating Air Conditioning Guide 1938 A'fg OF,. -- m = Cpa (/ -- t<) + C^W (t -. t') (9a) and using = 0.24 and Cpj -- 0.45 where A'fg (lVt. -- HO = (0.24 + 0.45HO (t - <0 (9b) h'iz = latent heat of vaporization at f, Btu per pound.

Heating Ventilating Air Conditioning Guide 1938 great.

Heating Ventiuiting Air Conditioning Guide 1938 High Ceilings: Research data concerning stratification of air in build ings are lacking, but in general it may be said that where the increase in temperature is due to the natural tendency of the warmer or less dense air to rise, as where a direct radiation system is installed, the temperature of the air at the ceiling increases with the ceiling height.

Heating VentiIiAting Air Conditioning Guide 1938 system more slowly and remain in the radiator longer.

Heating Ventilating Air Conditioning Guide 1938 perature results in an increase in length of the pipe for which provision must be made.

Heating Ventilating Air Conditioning Guide 1938 leave the entire floor and wall area free for commercial use.

Heating Ventilating Air Conditioning Guide 1938 DEHUMIDIFICATION PROCESSES Dehumidification may be accomplished in any of three ways, or by a suitable combination of them: 1.

Heating Ventilating Air Conditioning Guide 1938 I bctt " -V, \ / ii-A1 l>_t-nu /: a-r'%* TMgg***wU18UI jaajjs uioij wiai: 772 Chapter 42.

Heating Ventilating Air Conditioning Guide 1938 nected in series are called thermopiles.