Carrier 50KQL-1PD manual

VII ARI/ISO 13256-1 Conversion

Performance standard ARI/ISO 13256-1 became effective on January 1, 2000 and replaced the exist- ing ARI Standards 320 Water-Loop Heat Pumps (WLHP), 325 Ground-Water Heat Pumps (GWHP), and 330 Ground-Loop Heat Pumps (GLHP).

The ARI/ISO Standard incorporates a consistent rating methodology for including fan and pump energy for calculating cooling capacity, heating capacity, and energy efficiency ratios (EER). This simplifies the use of rating data for heat pump per- formance modeling in seasonal energy analysis cal- culations, and allows for direct rating comparisons across applications.

a) ISO Capacity and Efficiency Equations

The following equations are used to calculate and correct cooling capacity, heating capacity, and respective EER:

ISO Cooling Capacity = (Cooling Capacity in Btuh) + (Fan Power Correction in Watts x 3.412)

ISO Cooling EER = (ISO Cooling Capacity in Btuh/3.412)/(Power Input in watts – fan power correction in watts + pump power correction in watts) = Watts/Watts

NOTE: Do not divide ISO Cooling Capacity by 3.412 to obtain Btuh/Watts.

ISO Heating Capacity = (Heating Capacity in Btuh) – (Fan Power Correction in Watts x 3.412)

ISO Heating EER = (ISO Heating Capacity in Btuh/3.412)/(Power Input in watts – fan power correction in watts + pump power correction in watts) = Watts/Watts

NOTE: Do not divide ISO Heating Capacity by 3.412 to obtain Btuh/Watts.

b)Identify the design conditions corrected for air and water conditions.

Airflow Cfm = 308 Cfm

Water Flow

(Based upon 10 F rise in temp) = 3.1 GPM

External Static Pressure = 0.0 in. wg (non-ducted application)

Water Pressure Drop = 3.7 ft of head Power input = 1,067 watts Cooling Capacity = 11,741 Btuh

c) Perform Fan Power Correction Adjustment

Use the following formula to calculate Fan Power Correction:

Fan Power

Correction = (Cfm x 0.472) x (External Static Pressure x 249)/300 = Watts

=(308 x 0.472) x (0 x 249)/300

=0 Watts

d)Perform Pump Power Correction Adjustment

Use the following formula to calculate Pump Power Correction:

Pump Power

Correction = (GPM x 0.0631) x (Pressure Drop

x 2,990)/300

=Watts

=(3.1 x 0.0631) x

(3.7 x 2,990)/300

=7.2 Watts

e)Perform capacity and EER calculations

Use the following formula to calculate capacity and EER:

ISO Cooling

Capacity = (Cooling Capacity) + (Fan Power Correction x 3.412)

=11,741 + (0 x 3.412)

=11,741 Btuh

f)Perform Corrections by using the ISO Equations

ISO EER = (ISO Cooling Capacity/3.412)/ (Power Input – Fan Power Correc- tion + Pump Power Correction)

= Watts/Watts

NOTE: Do not divide ISO Cooling Capacity by 3.412 to obtain Btuh/Watts.

=(11,741/3.412)/(1,067 – 0 + 7.2)

=3.20 Watts/Watt

=10.93 Btuh/Watt