A storage has dimensions of 7m x 6m x 3.5m with 200mm insulation of polyurethane (k=0.03W/m-K) and consists of an evaporator with a capacity of 65 kW. The inside diameter of the cooling coil (k-20W/m-K) in the evaporator is 2.22cm and outside diameter is 254cm; length is 50ft. The evaporator is connected to the water- cooled condenser (crossflow type of heat exchanger) outside the storage which has water inlet temperature of 30°C and outlet of 35°C. The temperature of the gas entering the condenser is 18°C and the outlet is 5°C. Assume that the temperature of the gas at the outlet of the condenser is the same temperature of the gas entering the evaporator. 1. Draw the temperature-length diagram and find the LMTD at the condenser. 2. Determine the heat gain of the water in the condenser. 3. Find the temperature inside the storage. 4. If the temperature of the surroundings is 35°C, and the temperature of the ground is 25°C, what is the total heat transferred between the walls, ceiling, and floor. 5. If a 240°C spherical body with a diameter and emissivity of 40cm and 0.9 respectively, is suspended in the storage, estimate the rate of heat transfer in J/s.

A storage has dimensions of 7m x 6m x 3.5m with 200mm insulation of polyurethane (k=0.03W/m-K) and consists of an evaporator with a capacity of 65 kW. The inside diameter of the cooling coil (k-20W/m-K) in the evaporator is 2.22cm and outside diameter is 254cm; length is 50ft. The evaporator is connected to the water- cooled condenser (crossflow type of heat exchanger) outside the storage which has water inlet temperature of 30°C and outlet of 35°C. The temperature of the gas entering the condenser is 18°C and the outlet is 5°C. Assume that the temperature of the gas at the outlet of the condenser is the same temperature of the gas entering the evaporator. 1. Draw the temperature-length diagram and find the LMTD at the condenser. 2. Determine the heat gain of the water in the condenser. 3. Find the temperature inside the storage. 4. If the temperature of the surroundings is 35°C, and the temperature of the ground is 25°C, what is the total heat transferred between the walls, ceiling, and floor. 5. If a 240°C spherical body with a diameter and emissivity of 40cm and 0.9 respectively, is suspended in the storage, estimate the rate of heat transfer in J/s.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.41P

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