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Additional info for Air Conditioning Clinic Cooling and Heating Load Estimation One of the Fundamental Series TRG-TRC002-EN

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There are three methods commonly used to estimate infiltration airflow. 38 TRG-TRC002-EN period two Cooling Load Estimation notes The air change method is the easiest, but may be the least accurate of these methods. It involves estimating the number of air changes per hour that can be expected in spaces of a certain construction quality. Using this method, the quantity of infiltration air is estimated using the equation: infiltration airflow = (volume of space × air change rate) ÷ 60 [infiltration airflow = (volume of space × air change rate) ÷ 3,600] where, n Infiltration airflow = quantity of air infiltrating into the space, cfm [m3/s] n Volume of space = length × width × height of space, ft3 [m3] n Air change rate = air changes per hour n 60 = conversion from hours to minutes n 3,600 = conversion from hours to seconds The crack method is a little more complex and is based upon the average quantity of air known to enter through cracks around windows and doors when the wind velocity is constant.

While all of these sources contribute sensible heat to the space, people, cooking processes, and some appliances (such as a coffee maker) also contribute latent heat to the space. VHQVLEOH KHDW JDLQ ODWHQW KHDW JDLQ PRGHUDWHO\ DFWLYH ZRUN RIILFH  %WXK  %WXK VWDQGLQJ OLJKW ZRUN RU ZDONLQJ VWRUH  %WXK  %WXK OLJKW EHQFK ZRUN IDFWRU\  %WXK  %WXK KHDY\ ZRUN IDFWRU\  %WXK  %WXK DWKOHWLFV J\PQDVLXP  %WXK  %WXK OHYHO RI DFWLYLW\ > :@ > :@ > :@ > :@ > :@ > :@ > :@ > :@ > :@ > :@ Figure 36 As mentioned in Period One, people generate more heat than is needed to maintain body temperature.

The last variable, whether or not internal shading devices are installed, affects the amount of solar heat energy passing through the glass. The 1997 ASHRAE Handbook—Fundamentals contains tables of SCL values for common space types, based on combinations of these variables. Table 7 [Table 8] is an excerpt from the handbook and includes SCL factors for a space type similar to the one in our example. The space in our example is classified as Space Type A. The data in this table is based on the 21st day of July and 40º north latitude.

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Air Conditioning Clinic Cooling and Heating Load Estimation One of the Fundamental Series TRG-TRC002-EN by The Trane Company


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