Questions and Answers
A higher ______ rating means lower operating costs.
efficiency
The ______ is a ratio of useful heating or cooling provided to work (energy) required.
coefficient of performance
Furnaces are rated by the ______ ratio, which is the percent of heat produced for every dollar of fuel consumed.
Annual Fuel Utilization Efficiency
The ______ measures the energy efficiency of a heat pump over an entire heating season.
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The ______ is the ratio of the cooling capacity (in British thermal units (Btu) per hour) to the power input (in watts).
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An ______ rating measures how well your AC turns electrical energy into cold air.
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The Integrated Part Load Value (_____) is a weighted average efficiency at part-load capacities.
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______ is a mathematically determined ratio of the total cooling capacity during normal periods of operation divided by the total electric energy input during the same time period.
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The Heating Seasonal Performance Factor (_____) is a term used in the heating and cooling industry.
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The Energy Utilization Index (_____) is a metric used to measure the energy efficiency of a building.
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AHRI Standard 550/590 sets testing conditions that apply to describe chiller performance in ______ at various part-load operating capacities.
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The ______ is measured by the amount of energy a building uses per square foot per year.
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Study Notes
Efficiency Ratings
- An efficiency rating measures how well an air conditioner (AC) turns electrical energy into cold air, with a higher rating indicating lower operating costs.
- Energy consumption through heating and cooling represents a significant portion of energy utility costs for most households.
Furnace Efficiency
- Annual Fuel Utilization Efficiency (AFUE) is a ratio of heat produced for every dollar of fuel consumed, with a higher rating indicating lower fuel costs.
Heat Pump and Refrigerator Efficiency
- Coefficient of Performance (COP) is a ratio of useful heating or cooling provided to work (energy) required, with higher COPs equating to higher efficiency and lower operating costs.
Heat Pump Efficiency
- Seasonal Coefficient of Performance (SCOP) measures the energy efficiency of a heat pump over an entire heating season.
- Heating Seasonal Performance Factor (HSPF) is a term used to measure the efficiency of air source heat pumps, defined as the ratio of heat output to electricity used over the heating season.
Air Conditioner Efficiency
- Energy Efficiency Ratio (EER) is a ratio of the cooling capacity to the power input, with a higher EER rating indicating a more efficient air conditioner.
- Seasonal Energy Efficiency Ratio (SEER) is a mathematically determined ratio of the total cooling capacity to the total electric energy input during a specific time period.
Chiller Efficiency
- Integrated Part Load Value (IPLV) is a weighted average efficiency at part-load capacities, often used to describe chiller performance in kW/ton at various part-load operating capacities.
Building Efficiency
- Energy Utilization Index (EUI) is a metric used to measure the energy efficiency of a building, calculated by the amount of energy a building uses per square foot per year.
