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7.A. - Page 193 of 285 2019 Nonresidential New Construction Reach Code Cost Effectiveness Study
<br />If these losses are considered savings for the electric resistance reheat (which has zero associated
<br />distribution loss) may be higher.
<br />The all -electric SHW system remains the same electric resistance water heater as the baseline and has no
<br />associated incremental costs.
<br />Cost data for medium office designs are presented in Figure 10. The all -electric HVAC system presents
<br />cost savings compared to the hot water reheat system from elimination of the hot water boiler and
<br />associated hot water piping distribution. CZ10 and CZ15 all -electric design costs are slightly higher
<br />because they require larger size rooftop heat pumps than the other climate zones.
<br />Figure 10. Medium Office HVAC S stem Costs
<br />Climate Zone Mixed Fuel
<br />Baseline
<br />All Electric System
<br />Incremental cost
<br />for All -Electric
<br />CZ01 $1,202,538
<br />$1,106,432
<br />$(96,106)
<br />CZ02 $1,261,531
<br />$1,178,983
<br />$(82,548)
<br />CZ03 $1,205,172
<br />$1,113,989
<br />$(91,183)
<br />CZ04 $1,283,300
<br />$1,205,434
<br />$(77,865)
<br />CZ05 $1,207,345
<br />$1,113,989
<br />$(93,356)
<br />CZ06 $1,216,377
<br />$1,131,371
<br />$(85,006)
<br />CZ07 $1,227,932
<br />$1,148,754
<br />$(79,178)
<br />CZ08 $1,250,564
<br />$1,172,937
<br />$(77,626)
<br />CZ09 $1,268,320
<br />$1,196,365
<br />$(71,955)
<br />CZ10 $1,313,580
<br />$1,256,825
<br />$(56,755)
<br />CZ11 $1,294,145
<br />$1,221,305
<br />$(72,840)
<br />CZ12 $1,274,317
<br />$1,197,121
<br />$(77,196)
<br />CZ13 $1,292,884
<br />$1,221,305
<br />$(71,579)
<br />CZ14 $1,286,245
<br />$1,212,236
<br />$(74,009)
<br />CZ15 $1,357,023
<br />$1,311,994
<br />$(45,029)
<br />CZ16 $1,295,766
<br />$1,222,817
<br />$(72,949)
<br />3.3.1.2 Medium Retail
<br />The baseline HVAC system includes five packaged single zone rooftop ACs with gas furnaces. Based on fan
<br />control requirements in section 140.4(m), units with cooling capacity >_ 65,000 Btu/h have variable air
<br />volume fans, while smaller units have constant volume fans. The SHW design includes one 8.75 kW
<br />electric resistance hot water heater with a 30 -gallon storage tank.
<br />For the medium retail all -electric HVAC design, the Reach Code Team assumed packaged heat pumps
<br />instead of the packaged ACs. The all -electric SHW system remains the same electric resistance water
<br />heater as the baseline and has no associated incremental costs.
<br />Cost data for medium retail designs are presented in Figure 11. Costs for rooftop air-conditioning systems
<br />are very similar to rooftop heat pump systems.
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