Cooling load temperature difference calculation method: Difference between revisions

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The '''cooling load temperature difference (CLTD)''' '''calculation method''', also called the '''cooling load factor''' '''(CLF)''' or '''solar cooling load factor''' '''(SCL) method''', is a method of estimating the [[cooling load]] or [[heating load]] of a building. It was introduced in the 1979 [[ASHRAE]] handbook.

==CLTD/CLF/SCL cooling load calculation method==

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Q = U*A*CLTD <ref name=SML/><ref name=Textbook/>

Q = U*A*Td(T2-T1)

Where UQ = over allOverall heat transfer BTU\HRin Btu per hour

U = Overall heat transfer coefficient in Btu/(ft2-hr-deg F)

A=Area ft2

T1 A = outdoorArea in temperaturesquare °Ffeet

T2 T1 = indooroutdoor temperature °in degrees F

T2 = indoor temperature in degrees F

===For heat gains due to people, equipment (hooded and unhooded), and lighting===

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Q = A*SC*SCL <ref name=SML/><ref name=Textbook/>

===Data tblestables===

In addition to tables published by [[ASHRAE]] for select latitudes, a computer program called CLTDTAB, availablereleased sincein 1993 and no longer available, cancould behave been used to generate custom CLTD/CLF/SCL tables for a specific zone type for any [[latitude]] and month. This allowsused to allow the use of this method, without interpolation, for any area in the world.<ref name=SML/>

If thea program similar CLTDTAB is used, the results obtained using this method will tend to be very close to the more rigorous TFM Method mentioned earlier.<ref name=SML/> CLTDTAB is no longer available, similar software can be purchased and downloaded.

==References==

{{reflist}}

[[Category:Heating, ventilatingventilation, and air conditioning]]