WaterFurnace OM1500MW Owner's Manual
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Contents
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31GlossaryLearn to speak like your favorite HVAC contractor using these key terms.AFUE (Annual Fuel Utilization Efficiency): The efficiencypercentage of fossil fuel furnaces. Includes cycling andfuel losses and other factors.BTU (British Thermal Unit): The amount of heat neededto raise the temperature of one pound of water onedegree Fahrenheit.BTUH: The number of BTUs produced in one hour. Used tosignify the heating and cooling capacity of a system andthe heat losses and gains of buildings and homes.CFM (Cubic Feet per Minute): Volume of air movement.Used in duct design calculations.Compressor: The central part of a heat pump system. Thecompressor increases the pressure and temperature of therefrigerant and simultaneously reduces its volume whilecausing the refrigerant to move through the system.Condenser: A heat exchanger in which hot, pressurized(gaseous) refrigerant is condensed by transferring heat tocooler surrounding air, water or earth.COP (Coefficient of Performance): Heating efficiencyrating for a geothermal system. BTU output divided byBTU input.Degree Days (Heating & Cooling): Calculated by addingthe high and low temperatures of the day, dividing by 2,then subtracting from 65. (Example: High 42, Low 20 = 34heating degree days.)Delta T (or ΔT): The change in temperature (degrees).Usually associated with water or air temperatures.EER (Energy Efficiency Ratio): Cooling efficiency ratingfor geothermal systems. BTU output divided by watt input.Fossil Fuel: Any of several types of combustible fuelsformed from the decomposition of organic matter.Examples are natural gas, propane, fuel oil, oil and coal.GPM (Gallons per Minute): A reference to the flow rate ofwater through the geothermal unit.Heat Exchanger: A device designed to transfer heatbetween two physically separated fluids or mediums (air,water, or refrigerant) of different temperatures.Heat Loss: The amount of energy (BTUs/hr) lost from thehome during cold weather that needs to be overcome/supplied by the heating system. The amount varies basedon outdoor air temperatures.Heat Gain: The amount of heat (BTUs/hr) that is absorbedby the home during hot weather, requiring removal by theair conditioner in order to cool the home. Varies based onoutdoor air temperatures.Heat Sink: The medium (air, water or earth) which receivesheat rejected from a heat pump.Heat Source: The medium (air, water or earth) from whichheat is extracted by a heat pump.Hot Water Generator: A device that recovers superheatfrom the compressor discharge gas for heating water.HSPF (Heating Season Performance Factor): Heatingefficiency rating for heat pumps over the course of theentire heating season.Infiltration / Exfiltration: Air movement into the homethrough “leaks” (infiltration), or movement of air frominside the home to the outside (exfiltration).Relative Humidity: The ratio of the amount of water vaporactually present in the air to the greatest amount possibleat the same temperature. During heating, RH levels of 40-50% are generally recommended.R-Value: The resistance of heat movement through aninsulating material. Varies with thickness and type.SEER (Seasonal Energy Efficiency Ratio): Coolingefficiency rating for heat pumps and air conditioners.Calculated over the entire cooling season.Solar Gains: Heat gain generated through the heating ofwalls and windows by the sun.Ton: In HVAC terms, 12,000 BTUs per hour.Variable Capacity Compressor: Featured in our 7 Seriesunits, the compressor can ramp itself up or down from20% to 130% making it the most efficient compressortechnology available. It will scale output to exactly what isneeded for the home.Wind Chill: A still-air temperature that would havethe same cooling effect on exposed skin as a givencombination of temperature and wind speed. Does notaffect heating requirements for your home.GLOSSARY |
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