Thermal - Body Coefficient of Performance ( ) W Q = COP net...

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1 ME 417 Design of Alternative Energy Systems Basic Thermal Engineering Control Volume Energy Balance Two types of control volumes: Work Devices: turbines, pumps, compressors Heat Devices: boilers, condensers, heat exchangers Steady state energy balance Work Devices: { } ) z z ( g 2 / ) v v ( ) h h ( m W 1 2 2 1 2 2 1 2 in - + - + - = ± ± Heat Devices: { } ) z z ( g 2 / ) v v ( ) h h ( m Q 1 2 2 1 2 2 1 2 in - + - + - = ± ± Ideal Performance Work Devices: Δ s = 0 Heat Devices: DP = 0P = 0 Device Efficiencies Work Consuming Devices: s ideal act W W η = ± ± Work Producing Devices: ideal s act W W ± ± η = Heat Exchanges: { } ) z z ( g 2 / ) v v ( ) h h ( m Q 1 2 2 1 2 2 1 2 in - + - + - = ± ± Overall System Energy Analysis Device Purpose Performance Criteria Carnot Criteria Heat Engine Produce Work Thermal Efficiency Q W = H net th η T T - 1 = H L Carnot η Heat Pump Supply Heat to a
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Unformatted text preview: Body Coefficient of Performance ( ) W Q = COP net H HP T T-1 1 = COP H L Carnot Refrigerator Extract Heat From a Body Coefficient of Performance ( ) W Q = COP net L Ref 1 T T 1 = COP L H Carnot-As a modeling tool for these plants we may use the following two interaction diagrams. ME 417 Design of Alternative Energy Systems 2 We also have conservation of energy for these plants, which gives Q = W + Q H net L High Temperature Heat Reservoir at T H Low Temperature Heat Reservoir at T L Heat Engine High Temperature Heat Reservoir at T H Low Temperature Heat Reservoir at T L Heat Pump or Refrigerator Q L Q H Q H Q L W net W net...
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Thermal - Body Coefficient of Performance ( ) W Q = COP net...

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