Reading School District
System Type
Geothermal Heat Pump
Conventional VAV
Dual Duct VAV
High Efficiency Air-Cooled Chiller and Condensing Boiler VAV Terminal Unit (shut-off and parallel fan powered)
High Efficiency Air-Cooled Chiller and Condensing Boiler
Central Plant
Geothermal Field
Description
Classroom Terminal Equipment
Individual Heat Pumps
Dual Duct VAV Terminal Unit
Installed Costs ($/sq.ft.) Operating Cost ($/sq.ft./yr) Operating Energy (kBtu/sq.ft./yr)
To be determined based on schematic cost estimates
33.1
44.8
40.9
0.75 Electric
0.81
0.69
Heat Source
Natural Gas
Natural Gas
Estimated Maximum LEED points
19
2
9
Central Equipment Life Expectancy
60
25
25
Terminal Equipment Life Expectancy
15
30
30
Each zone has a separate compressor. No maintenance required for central equipment. Heat pump closets should be created in each classroom. Location of geothermal field needs to be coordinated with stormwater retention and project phasing.
Fan powered VAV terminal units have filters that require servicing.
Maintenance Concerns
Minimal
Two separate air duct systems. Need chases from rooftop equipment to each floor. Dual duct terminal units with duct connections are large.
Need chases from rooftop equipment to each floor.
Architectural Design Impact
Energy Recovery
Yes Yes
Yes No
Yes Yes
Dedicated Outdoor Air System
Humidity Control
Active humidity control
Passive humidity control
Passive humidity control
Considerable impact on emergency power system
Minor impact on emergency power equipment
Minor impact on emergency power equipment
Emergency Generator Backup
31
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