COSC 325 MEP EXAM 1 ACTUAL QUESTIONS AND

COSC 325 MEP EXAM 1 (ACTUAL / ) QUESTIONS AND

VERIFIED ANSWERS

Heat Pump - ---Answers----A reversible refrigeration machine that takes heat from a cool source and delivers it to a warmer location. Initial cost is higher, but can cool a building during summer months

Hydronic Heating components - ---Answers----Heat exchanger, circulating loop, pump, boiler

Convectors - ---Answers----Warm air by contact; warmed air then rises and is replaced by denser cool air

Fin-tube convectors - ---Answers----economical eating choice for homes and a re components of HVAC systems in commercial buildings; usually located below windows where rising warm air overcomes cold drafts and minimizes condensation

One-pipe loop - ---Answers----is economical, but water temperature drop in the loop means downstream fin-tubes must be longer for a given heat output

Reverse return loop - ---Answers----superior because it provides the same water supply temperature at each fin-tube. 1 / 3

Constant inlet temperature makes sizing easier and allows better regulation of heat output.

Panel Radiators - ---Answers----can replace fin-tubes where available wall length is limited

Radiant Surface Heatin - ---Answers----is efficient, quiet, invisible, draft-free, and comfortable. Radiating surfaces can be floors, walls, or ceilings.

Refrigeration Cycle - ---Answers----Cooling equipment moves heat from cool indoor spaces to warmer outdoor loactions; moves heat by causing a refrigerant to evaporate and condense. Refrigerants capture heat when they evaporate, and the capture heat is released when refrigerant vapor condenses

Pressure temperature - ---Answers----Cooling equipment maintains a low-pressure evaporator and a high-pressure condenser

Four refrigeration cycle components - ---Answers---- compressor, condenser, evaporator, and expansion valve

Which components absorb or reject heat? - ---Answers---- Evaporator absorbs, condenser rejects

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Five components to control and distribute conditioned air - --- Answers----1. Air Handler

• Supply Duct
• Return Path
• Exhaust air
• Fresh air

Air handler - ---Answers----controls air quantity, temperature, humidity, and quality as it filters and circulates air

Provision for exhaust air - ---Answers----to minimize odors and airborne contaminants

Four zoning alternatives - ---Answers----1. Individual units

• Single-zone
• Zoned
• Multizone

Individual Units - ---Answers----separately heat or cool each

room in a building; two types:

• Fan coils
• Packaged units
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