2

W = measured weight of test block, W, or
W1, expressed in pounds.
Cp=0.23 Btu's/lb-° F, specific heat of test
block.

Tsu temperature rise of the test block: final test block temperature, Ter, as determined in 3.2.2, minus the initial test block temperature, T1, expressed in F. HE 3.412 Btu's/Wh, conversion factor of watt-hours to Btu's.

Ecr measured energy consumption, as determined according to 3.2.2, expressed in watt-hours.

4.2.1.2 Gas surface unit cooking efficiency. Calculate the cooking efficiency, Effse of the gas surface unit under test, and defined as:

where:

P. any pilot lights gas consumption defined in 3.2.2.1.

Lelapsed time of the cooking top pilot lights test as defined in 3.1.2.1.

Tr the elapsed test time as defined in 3.2.2.

4.2.1.3 Conventional cooking top cooking efficiency. Calculate the conventional cooking top cooking efficiency, Effer, using the following equation:

ECA

OCT Eff CT

where:

Ecr total gas consumption for the gas surface unit test as defined in 3.2.2. Ec electrical energy consumed by an ignition device of a gas surface unit as defined in 3.2.2.

where:

ст

OCT 277.7 kWh per year, annual useful cooking energy output.

Effer conventional cooking top cooking efficiency as defined in 4.2.1.3.

4.2.2.2 Conventional gas cooking top

P-pilot light flow rate as defined in 4.2.1.2, or as measured in 3.2.2.1.

A 8,760 hours, the total number of hours in a year.

H=either H, or H,, the heating value of the gas used in the test as specified in 2.2.2.2. and 2.2.2.3, expressed in Btu's per standard cubic foot of gas. 4.2.2.2.3 Total annual energy consumption of a conventional gas cooking top. Calculate the total annual energy consumption of a conventional gas cooking top, ECA, in Btu's per year and defined as:

Effo Effo or Effro, the cooking efficiency of the oven(s) as determined according to 4.1.3.1 or 4.1.3.2.

Effer cooking top efficiency as determined in 4.2.1.3.

The constants 0.145 and 0.855 are fractions of the annual useful energy output represented by oven usage and cooking top usage respectively.

4.3.3 Conventional range energy factor. Calculate the energy factor, or the ratio of the useful cooking energy output to the total energy input on a yearly basis for the complete range, RR, and defined as: