An apartment building in Austin, Texas, andone in Boston, Massachusetts, were analyzed todetermine the cost-effectiveness of energyefficiency measures. To determine expected energyand cost savings resulting from a set of proposedretrofit measures, hour-by-hour simulations wereconducted using the DOE-2.1C building energyanalysis computer program. Based on detailed auditdata, supplemented by field-measurements in thecase of the Austin apartment building, thesimulations were run for base case (preretrofit)conditions for each building. Metered electricityand gas consumption was used to calibrate the inputdata.A series of proposed retrofit measures was runfor each building using the calibrated preretrofitmodel as the reference. Annual energy and costsavings were calculated separately for each measureand for the combined set of measures. For theAustin building the combined set of 11 measuresyielded expected savings of $3,710/year, a 42%savings in site energy. The combination of the 7measures considered for the Boston building yieldedexpected savings of $1.292/year, and annual energysavings of nearly 75%. Measured in situ airconditioner performance for two of the Austinapartments showed EERs of 5.70 and 5.55, indicatingan efficiency degradation of 22% and 24%,respectively, after 16 years of operation.
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