DOE-2 Reference Manual Version 2.1 - DOE2.com

KeywordAIR-CHANGESjHRINF-CFM/SQFTNEUTRAL-ZONE-HTINF-SCHEDULERES-INF-COEFINF-METHODNUNE AIR-CHANGE CRACK RESIDENTIALAir-Change l1JethodWith Wind Without WindNo Velocity Velocity CrackInfiltration Correction Correction Methodo/a requi red nfa n/a n/an/a n/a requi red n/a n/an/a n/a n/a optional n/an/a optional optional optional optionaln/a n/a n/a n/a optionalIn the case of the Crack Method, a value should be enteredfor the keyword INF-COEF in the EXTERIOR-WALL instruction,and for the keyword INF-COEF in the WINDOW instruction.RES-INF-COEFAIR-CHANGES/HR*is a list of 3 values which are coefficients in thefollowing formula:Infiltration = valuel + (value2 x windspeed) + (value3 x 6T)where infiltration is measured in air changes/hr, windspeedin knots (taken from the weather tape) and 6T (absolute valueof outdoor-indoor temperature differential) in OF. Thekeyword RES-INF-COEF is appropriate here in SPACE-CONDITIONSonly if INF-METHOD = RESIDENTIAL.is the number of infiltration-caused air changes per hour ata wind speed of 10 mph for a space (see table underINF-METHOD). It has a correction for wind speed as shown bythe following equation.Infiltration in cfm = (AIR-CHANGES/HR) x (space volume)/(60 min/hr)x (wind-speed)/(lO mph)(This keyword is not to be confused with a keyword of thesame name in SYSTEMS.)INF-CFM/SQFT*is the amount of infiltration into a space expressedratio of air vOlume/floor area (see table underINF-METHOD). It does not correct for wind speed.as a"* Une or both of these keywords should be entered. If both are enteredtheir effects are summed. Choice should be based on metnod or whetheror not a wind-speed correction is desired.II I. 50 (Revised 5/81)