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A. Hunter Fanney
Senior Research Scientist, Energy and Environment Division
Engineering Laboratory
National Institute of Standards and Technology
(301) 975-5864
hunter.fanney@nist.gov

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Monthly Result May 2014

During April 2014, the NZERTF consumed 716  kWh of electrical energy. The solar electric photovoltaic system generated 1600 kWh of electricity during the month. The difference between the energy produced by the solar photovoltaic system and the energy consumed by the NZERTF, 884 kWh, was exported to the electric grid. A graphical representation of the energy consumed and generated is found in the year to date results. The following chart breaks down the total energy consumed by the house into the various end uses. For the month of May 2014  the greatest energy end use was for space conditioning to maintain the house at 70 F +/- 1 F (21.1 C +/- 0.5 C, followed by plug loads. The third largest user was for appliances.

Plug loads, 212.0; Lighting, 39.5; Appliance, 153.4; Hot Water Heating, 89.6; Heating, Cooling, Ventilation, 221.6


A breakdown of the appliance end use into the energy consumed by individual appliances is captured in the following pie chart. During the month of May 2014 the greatest appliance energy usage was associated with the clothes dryer.

Microwave, 5.4; Oven, 33.7; Cooktop, 20.1; Refrigerator, 35.9; Clothes Dryer, 44.2; Clothes Washer, 6.1; Dishwasher, 7.9