Heat Exchanger - 2 - Mechanical Engineering MCQ

A solar assisted air conditioning system, 1 kg/sec of ambient air is to be preheated by the same amount of air leaving the system. A counter-flow heat exchanger having an area of 60 m² with overall heat transfer coefficient of 25 W/m²K is used for this purpose. Assuming c_p for air is 1 kJ/kgK. The effectiveness of the heat exchanger is

Hot air enters a single pass counter flow heat exchanger at 700 K and leaves at 400 K the cooling water enters at 300 K and leaves at 600 K. The LMTD for the heat exchanger is

For the same inlet and outlet temperatures of hot and cold fluid, the LMTD is

Which one of the following graphs, showing temperature distributions of different heat exchangers, pertains steam condenser

In which type of heat exchanger is the inlet temperature difference between the hot and cold fluids is maximum

In a counter flow heat exchanger, the product of specific heat and mass flow rate is same for the hot and cold fluids. If NTU is equal to 0.5 then the effectiveness of the heat exchanger is

When t_c1 and t_c2 are the temperatures of cold fluid at entry and exit respectively and t_h1 and t_h2 are the temperature of hot fluid at entry and exit point and cold fluid has lower heat capacity rate as compared to hot fluid then effectiveness of the heat exchanger is given by