The objective of this design exercise is to design a suitable cooling system to cool air for air conditioning purposes. The system to be designed is a chilled water system, employing a single stage spray cooler to achieve the required air-cooling duty at the delivery end of the system. Additionally you are to design a suitable vapour compression refrigeration system to achieve this duty, a suitable chilled water piping system to achieve the required duty and suitable heat rejection facilities for the refrigeration plant using a cooling tower.
Details of the system are as follows:
Spray cooler:
1. Air quantity to be cooled 300 m3/s.
2. Inlet air condition; dry bulb temperature 32°C, wet bulb temperature 25°C.
3. Outlet air temperature 12°C saturated.
4. Single stage spray cooler.
Reticulation (piping system):
Steel pipes, insulation can be used, pipe diameter to be selected by the student. It can be assumed that the spray cooler is located 1000m below surface a total distance of 1800m from the proposed refrigeration plant site which is to be located on the surface.
Refrigeration unit:
Refrigerant to be R12, vapour compression refrigeration system.
Heat rejection:
Cooling towers, inlet air temperature 32°C dry bulb, 25°C wet bulb.
Assume that the barometric pressure is 100kPa in all cases.
Must undertake a design of all elements of the system, as a hint work from the spray cooler backwards through the system. All assumptions should be detailed.