Objectives AHU processes - HW2 Cooling cycles.

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Presentation transcript:

Objectives AHU processes - HW2 Cooling cycles

Air conditioning

Single-Zone Systems Zone – any space with a thermostat

Recirculation

Reheat

Evaporative Cooler

Air-to-air heat exchanger

Vapor Compression Cycle Expansion Valve

Efficiency First Law Second law Coefficient of performance, COP COP = useful refrigerating effect/net energy supplied COP = qr/wnet Second law Refrigerating efficiency, ηR ηR = COP/COPrev Comparison to ideal reversible cycle

Carnot Cycle No cycle can have a higher COP All reversible cycles operating at the same temperatures (T0, TR) will have the same COP For constant temp processes dq = Tds COP = TR/(T0 – TR)

Get Real Assume no heat transfer or potential or kinetic energy transfer in expansion valve COP = (h3-h2)/(h4-h3) Compressor displacement = mv3

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