1. Find the irreversibility rate of an adiabatic expansion valve that reduces 0.0660 kg/s of refrigerant R-22 from a saturated liquid at 25.0°C to a liquid-vapor mixture with a quality of 15.0% at 0.00°C. The local environmental temperature is 20.0°C.
2. Design a small vapor-compression cycle refrigeration system that can serve as an experimental apparatus for a junior or senior mechanical engineering laboratory course. The system must be instrumented with the proper pressure, temperature, and mass flow transducers, so that its coefficient of performance can be accurately determined. The system should have at least one variable parameter (such as refrigerant mass flow rate) to provide a range of performance to study.
You may wish to start by modifying the components of an existing domestic refrigerator. Either construct the apparatus yourself or else provide sufficiently accurate drawings (or sketches) and instructions that it can be made by an engineering technician.