Comparison of Rating Water-Source Heat Pumps Using ARI Standard 320 and ISO Standard 13256-1.
Comparison of Rating Water-Source Heat Pumps Using ARI
Standard 320 and ISO Standard 13256-1.
Payne, W. V.; Domanski, P. A.
NISTIR 6803; 44 p. September 2001.
Available from: National Technical Information Service
(NTIS), Technology Administration, U.S. Department of
Commerce, Springfield, VA 22161.
1-800-553-6847 or 703-605-6000;
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Order number: PB2002-100265
heat pumps; water; standards; air conditioner; ARI
Standard 320; capacity; ISO Standard 13256-1;
water-source heat pump
This investigation compares the ARI 320 (1998) and the
ISO 13256-1 (1998) heating and cooling standards for
water-source heat pumps to determine the difference in
capacity and efficiency for a given heat pump tested
with these standards. Multiple tests were run using two
heat pumps of different capacities from different
manufacturers. These tests included two small units a
ducted 1.75 kW (0.5 ton) unit and a non-ducted 3.52 kW
(1.0 ton) unit. Air and water flow were varied at the
ISO conditions to determine the correction in capacity
and total power mandated by the ISO standard. The
effects of this variability were measured and compared
to test results using the ARI 320 standard as the
baseline test. ISO cooling capacity for the first and
second units were 0.05% higher and 1.10% lower than the
ARI capacity, respectively. ISO cooling EER for the
first and second nits were 4.47% higher and 3.88% lower
than the AIR, respectively. ISO heating capacity for the
first and second units were 4.78% lower and 2.88% lower
than the ARI capacity, respectively. ISO heating COP for
the first and second units were 6.24% higher and 1.01%
lower than the ARI, respectively.