refrigeration-cycle-screencast

Refrigeration Cycle: Screencast

Explains each step in a refrigeration cycle and the energy balance for each step. The process is shown in a pressure-enthalpy diagram.

We suggest you list the important points in this screencast as a way to increase retention.

Important Equations:

Coefficient of performance: $C O P = \frac{Q_{C}}{W_{S}} (C O P > 1)$ where $Q_{C}$ is the heat added to the evaporator (low temperature part of the cycle) and $W_{S}$ is the work done by the compressor $Q_{C} > 0, W_{S} > 0)$

Energy balance for adiabatic compressor: $Δ H = W_{S}$ where $Δ H$ is the enthalpy change across the compressor $(Δ H > 0)$

Entropy ( $S$ ) change for reversible adiabatic compressor: $Δ S = 0$ Energy balance for evaporator: $Δ H = Q_{C}$ where $Δ H$ is the enthalpy change across the evaporator and $Q_{C}$ is the heat added at low temperature $(Q_{C} > 0)$

Energy balance for condenser: $Δ H = Q_{H}$ where $Δ H$ is the enthalpy change across the condenser and $Q_{H}$ is the heat removed at high temperature $Q_{H} < 0$

Energy balance for adiabatic throttle: $Δ H = 0$ (no heat transfer and no work on throttle)

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Refrigeration Cycle: Screencast

Important Equations: