Q8: 100 m of air at 35°C and 70% relative humidity is cooled to 20° C and 55% relative humidity by passing it through a cooling coil. Using psychrometric tables only, find: 1. the amount of water vapor removed in kg /h; and 2. the cooling capacity of the coil in tones of refrigeration assume specific heat of superheated vapor in air as 1.88 kJ/kg K and R for air = 287.14 kJ/kg K. [Ans. 144 kg/h. ; 37 TR]

2. Compare the heat loss from an insulated and an uninsulated copper pipe (k-400 W/m K) under the following conditions. The pipe has an internal diameter of 10 cm and an external diameter of 12 cm. The inside surface temperature of the pipe is at 110°C. The pipe is located in a space where all possible outside surface temperature of material was maintained at 30°C. The insulation available to reduce heat losses is 5 cm thick and its conductivity is 0.20 W/m K. If the furnace for heating the fluid in the pipe operating at an efficiency of 85% using natural gas priced at Cg = Php 1.00/MJ, what is the daily cost of heat loss per meter of pipe?

14. The sun's temperature decreases steadily as the distance from its innermost regions increases. The sole exception to this is in the outermost part of the sun's atmosphere. This region, called the corona, consists of thin gases that are heated by the sun's magnetic field. As a result, the corona has an average temperature of about 1.0 x 10° K. What is this temperature in degrees Celsius? Must give answer then also | give answer in significant fig format