Question

A freezer is operating based on the basic vapor compression cycle. The freezer is rejecting the heat to a room at 22 C. \begin{itemize} \item The freezer fluid is R134a \item Assume ideal cycle for simplicity \end{itemize} Electrical power (We) Heat transfer from the room to freezer (Qf) a) Calculate the compressor energy per unit mass of coolant and COP of the refrigeration cycle, if the freezer temperature is set to -20 C (Hint: for simplicity take condenser pressure to be 0.6 MPa). b) If the heat transfer rate from the room to the freezer is Qf=3 kW, estimate the electrical power (We) required to keep the freezer temperature at -20 C. Assume that all components (electric motor etc...) operate at an efficiency of 1.

          A freezer is operating based on the basic vapor
compression cycle. The freezer is rejecting the heat to a room at 22 C.
\begin{itemize}
    \item The freezer fluid is R134a
    \item Assume ideal cycle for simplicity
\end{itemize}
Electrical power
(We)
Heat transfer from
the room to freezer
(Qf)
a) Calculate the compressor energy per unit mass of coolant and COP of the refrigeration cycle, if the
freezer temperature is set to -20 C (Hint: for simplicity take condenser pressure to be 0.6 MPa).
b) If the heat transfer rate from the room to the freezer is Qf=3 kW, estimate the electrical power (We)
required to keep the freezer temperature at -20 C. Assume that all components (electric motor etc...)
operate at an efficiency of 1.

A freezer is operating based on the basic vapor
compression cycle. The freezer is rejecting the heat to a room at 22 C.

* The freezer fluid is R134a

* Assume ideal cycle for simplicity

Electrical power
(We)
Heat transfer from
the room to freezer
(Qf)
a) Calculate the compressor energy per unit mass of coolant and COP of the refrigeration cycle, if the
freezer temperature is set to -20 C (Hint: for simplicity take condenser pressure to be 0.6 MPa).
b) If the heat transfer rate from the room to the freezer is Qf=3 kW, estimate the electrical power (We)
required to keep the freezer temperature at -20 C. Assume that all components (electric motor etc...)
operate at an efficiency of 1.

Added by Eric F.

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