A refrigerant enters the condenser of vapour compression refrigeration system at enthalpy of 200 kJ/kg and leaves at enthalpy of 80 kJ/kg. The compressor consumes 3 kW power. The mass flow rate of the refrigerant through the evaporator is 6 kg/min. The COP of the system is

Q. In a 10 kW cooling capacity refrigeration system operating on VCRS, the refrigerant enters the evaporator with an enthalpy of 80 kJ/kg and leaves with an enthalpy of 180 kJ/kg. The enthalpy of the refrigerant after compression is 220 kJ/kg. The rate of heat transfer at the condenser is

Q. Refrigerant vapor enters into the compressor of a standard vapor compression cycle at $-{10}^{\circ }C(h=402kJ/kg)$ and leaves the compression at ${50}^{\circ }C(h=432kJ/kg)$. It leaves the condenser at ${30}^{\circ }C(h=237kJ/kg)$. The COP of the cycle is

Q. In an ideal vapour compression refrigeration cycle, the specific enthalpy of refrigerant (in kJ/kg) at the following states is given as:
Inlet of condenser: 283
Exit of condenser: 116
Exit of evaporator: 232
The COP of this cycle is

Q. In a simple vapour compression refrigeration plant, in which compressor inlet is dry saturated, the enthalpy at the inlet of bot compressor and evaporator are $1426kJ/kg$ and $347.5kJ/kg$. Mass flow rate, relative efficiency and maximum COP are $0.02kg/s,60$% and $5$ respectively. What is the work input to the compressor?

Q. A refrigerator based on ideal vapour compression cycle operates between the temperature limits of $-{20}^{\circ }C$ and ${40}^{\circ }C$. The refrigerant enters the condenser as saturated vapour and leaves as saturated liquid. The enthalpy and entropy values for saturated liquid and vapour at these temperatures are given in table below.

$\begin{array}{ccccc}T& h_f& h_g& s_f& s_g\\ {(}^{\circ }C)& \left(kJ/kg\right)& \left(kJ/kg\right)& \left(kJ/kgK\right)& \left(kJ/kgK\right)\\ -20& 20& 180& 0.07& 0.7366\\ 40& 80& 200& 0.3& 0.67\end{array}$

If refrigerant circulation rate is $0.025kg/s$, the refrigeration effect is equal to