where ..(47) and ..(47) and QDEF (35) and E..(47) and Q..(17) and E..(17) are the capacities (in Btu/hr) and powers (in watts), measured during the High Temperature Test, the Frost Accumulation test, and the Low Temperature Test, respectively.

Once the maximum and minimum HSPF and operating cost values have been obtained for each region, the HSPF and operating cost shall be determined for each standardized design heating requirement (see section 6.2.6) between the maximum and minimum design heating requirements by means of interpolation.

and

Q-2)(47), for region V

Q-2) (47)

(65-TOD) 60 II, III, IV, and VI

, for regions I,

Q..(-2) (47) is the heat pump capacity measured during the high temperature performance test at 47°F, with the unit operating at the high compressor speed or with both compressors in operation, in Btu/hr ToD is the outdoor design temperature given in section 6.2.4 in degrees F.

NOTE: The superscript (k=1) and (k=2) refer to the heat pump operating at low speed or single compressor operation and high speed or two compressor operation respectively.

30-032 0-89-5

E(T) N

RH(T;)

N

is the heat pump electrical energy usage in the jth temperature bin divided by the total number of bin hours and is evaluated according to the four possible cases of heat pump operation denoted below in watts.

as defined in 5.2.1 and is evaluated according to the four possible cases of heat pump operation denoted below (in watts).

Case 1.-Units operating at low compressor speed or with a single compressor, i.e., k=1, for which the building heating load, BL(T;) is less than or equal to the heating capacity, Q-1(T).

N

PLF-1

RH(T;) __N

RH(T;) __N

or

=

N

3.413

Qk-2( (3.413) (E

X-1(T;) =

Q-2(T;) — BL(T;)

=

Q-2(T)-Q-1(T;)