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COSC 325 MEP Exam 1/113 Questions & Answers
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COSC 325 MEP Exam 1/113 Questions & Answers
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COSC 325 MEP Exam 1/113 Questions& Answers
Psychrometic considerations impact efficient buildings in three significant
ways - - 1. Establish the air quantities and duct sizes required 2. Determine
the cooling capacity required to control moisture 3. Used to predict
condensation problems.
- Absorption - - a refrigeration cycle where input energy is heat
- Adiabatic - - Without gain or loss of heat
- Air-cooled condenser - - A heat exchanger that transfers building heat to
outdoor air
- BTU - - British thermal unit. Quantity of heat. One BTU will increase the
temperature of 1 lb of water 1 Fahrenheit (1 Calorie = 4 BTU)
- BTUH - - Rate of heat flow
- C - - The tendency to conduct heat for a standard thickness
- Coil - - A heat exchanger
- Constant volume - - HVAC equipment that controls room temperature by
controlling the temperature of conditioned air
- Cooling tower - - A heat exchanger that transfers building heat to outdoor
air by evaporating water
- COP - - Coefficient of performance. An efficiency rating for heating
equipment. BTU delivered divided by input BTU
- Dry-bulb temperature - - Temperature indicated by a standard
thermometer
- DX - - Direct expansion. Equipment that uses an evaporating refrigerant to
cool air
- EA - - Exhaust air
- Economizer - - Cooling with outdoor air
- Emissivity - - Tendency of a surface to radiate heat
, - Enthalpy - - Total heat in an air/water vapor mixture
- Entropy - - Tendency toward uniform inertness
- Grain - - 1/7,000 of a pound
- Head - - Total mechanical energy in a fluid at a point in a piping system.
- Heat pump - - A reversible refrigeration machine
- HSPF - - Heating seasonal performance factor. The number of BTUs per
watt delivered by a heat pump
- Hydronic - - Equipment that circulates water to move heat
- k - - Tendency to conduct heat for a 1-inch thickness of material
- Latent Heat - - Hidden heat, absorbed or relased when water changes
state
- OA - - Outside air
- Pyschrometrics - - Properties of air/water vapor mixtures
- Q - - Rate of heat transfer
- R - - Resistance. Tendency to resist heat flow. R = 1/C or 1/k
- RA - - Return air
- SEER - - Seasonal energy efficiency ratio. A cooling efficiency rating for ar
conditioners and heat pumps. The number of BTU removed by each watt of
energy input
- Sensible heat - - Dry heat, as measured by a dry bulb thermometer
- Specific heat - - Number of BTU that will increase the temperature of 1
pound of a substance 1 Fahrenheit
- U - - The tendency of a construction to conduct heat. The number of BTU
that will be conducted through one sq. ft. of a construction when the
temperature differnecd across the construction is 1 Fahrenheit (U=1/R)
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