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AFFINITY SINGLE STAGE HYDRONIC INSTALLATION MANUAL
Reference Calculations
Heating Calculations:
LWT = EWT -
HE
GPM x C*
HE = C* x GPM x (EWT - LWT)
NOTE: * C = 500 for pure water, 485 for brine.
Legend and Notes
Abbreviations and Definitions
ELT
= entering load fluid temperature to heat pump
SWPD = source coax water pressure drop
LLT
= leaving load fluid temperature from heat pump
PSI
= pressure drop in pounds per square inch
LGPM = load flow in gallons per minute
FT HD = pressure drop in feet of head
LWPD = load coax water pressure drop
LWT
= leaving water temperature
EWT
= entering water temperature
Brine
= water with a freeze inhibiting solution
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:
LWT = EWT +
HR
GPM x C*
HR = C* x GPM x (LWT - EWT)
kW
= kilowatts
EST
= entering source fluid temperature to heat pump
HE
= heat extracted in MBTUH
LST
= leaving source fluid temperature from heat pump
HC
= total heating capacity in MBTUH
COP = coefficient of performance, heating [HC/kW x 3.413]
EER = energy efficiency ratio, cooling
TC
= total cooling capacity in MBTUH
HR
= heat rejected in MBTUH
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