Category:Cool Room

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Cold environmental rooms likely do not have single circuits to measure power consumption. The major components are compressor, evaporator and lighting. They also may have heating coils on windows, or for precise temperature control and defrosting on the evaporators, and these should be measured as well.

Compressor Amperage and Voltage may be measured with CT's installed in the junction box by an electrician. Power factor is not measured when noted by "VA".

Evaporator power measurements was estimated at UC Davis. A few measurements indicated they draw 2.1-2.5 Amps, and we used that as an estimate for cold room evaporator power consumption after multiplying by the number of fans. In smaller cold rooms the evaporator fan apparently consumed more power than the compressor.

Lighting energy may be considered to be negligible.

Power consumption may vary greatly with control technology, so please describe its general characteristics.

Insulation is 4" (10 cm) unless otherwise indicated. Given that -20 °C rooms have an equivalent temperature differential to a house in Fairbanks, Alaska, it is surprising that wall insulation is not equivalent R-Value. In University settings door use is episodic, sometimes going days or weeks without being opened.

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