Moist air enters a cooling coil at 35°c dry bulb temperature and 55 percent relative humidity at a rate of 100 m/min, the air leaves at 27°c. calculate the capacity of the cooling coil in tonnes of refrigeration (tr) and the relative humidity of the air at the exit.

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.