Question

1-The temperature value inside a reactor in the treatment plant is 30 0C during operation. The outdoor temperature in the winter period is 5oC. The wall thickness of the reactor is 0.10 m and its area is 20 m2. Air and reactor wall heat transfer coefficients and conductivity are given below.
reactor = 20W / m2.K, creator = 0.8 W / m.K; outdoor environment = 10 W / m2.K
a. Under these conditions, calculate the heat loss value from the reactor.
b. Calculate the temperature value on the outer surface of the reactor.
c. What should be the thickness of the insulation material that can be used around the reactor to reduce the heat loss calculated in the A option by 1/2. (I got it = 0.2 W / m.K)

2-The flow rate of the fluid in a heat exchanger used to adjust the temperature of the reactor is 1.2 kg / s. Fluid enters the saturated vapor phase at 160kPa constant pressure and leaves the heat exchanger as saturated liquid. In this process, which is carried out by isobar processing, calculate whether the heat transfer will take place if the ambient temperature is 7.50C and under specified conditions. (h1 = 237.97 kJ / kg; h2 = 29.78 kJ / kg; S1 = 0.9295 kj / kg.K, S2 = 0.1211 kJ / kg.K)

3-For the experiment to be carried out in the Environmental Engineering laboratory, air conditioning cabin will be used. It is desired to keep the temperature inside this air-conditioning cabinet constant at 28 oC during the experiment period. The temperature of the laboratory is 38 oC. The cooling engine in the air conditioner removes 200KW of heat in this process. Calculate the performance coefficient and work value (KW) of the cooling engine in the air conditioning cabinet in reversible condition.

Answer 1

Solution:- 2)