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Reference Calculations
Heating Calculations:
HE
LWT = EWT -
GPM x 500*
NOTE: * When using water. Use 485 for 15% methanol/water or Environol solution.
Legend
Abbreviations and Definitions
ELT
= entering load fluid temperature to heat pump
LLT
= leaving load fluid temperature from heat pump
LGPM = load flow in gallons per minute
LWPD = load heat exchanger water pressure drop
EST
= entering source fluid temperature to heat pump
LST
= leaving source fluid temperature from heat pump
SGPM = source flow in gallons per minute
SWPD = source heat exchanger water pressure drop
EER
= cooling energy effciency (TC/KW)
Notes to Performance Data Tables
The following notes apply to all performance data tables:
• Three flow rates are shown for each unit. The lowest flow rate shown is used for geothermal open loop/well water
systems with a minimum of 50°F EST. The middle flow rate shown is the minimum geothermal closed loop flow rate.
The highest flow rate shown is optimum for geothermal closed loop systems and the suggested flow rate for boiler/
tower applications.
• Entering water temperatures below 40°F assumes 15% antifreeze solution.
• Interpolation between ELT, EST, and GPM data is permissible.
• Operation in the gray areas is not recommended.
Cooling Calculations:
HR
LWT = EWT +
GPM x 500*
10-15 TON HYDRONIC HEAT PUMP INSTALLATION GUIDE
PSI
= pressure drop in pounds per square inch
FT HD = pressure drop in feet of head
KW
= kilowatt
HR
= heat rejected in MBTUH
TC
= total cooling capacity in MBTUH
COP
= coefficient of performance (HC/KW x 3.413)
HC
= heating capacity in MBTUH
HE
= heat of extraction in MBTUH
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