A new heat exchanger is inducted in a power plant with an overall heat transfer coefficient 5000 W/m2-K. After continuous run of 2 years, overall heat transfer coefficient reduces to 2000 W/m2-K due to various factors like chemical deposition, scale and sludge formation. Then what will be fouling factor under this condition?
In a heat exchanger, the hot liquid enters with a temperature of 180 °C and leaves at 160°C. The cooling fluid enters at 30 °C and leaves at 110 °C. The capacity ratio of the heat exchanger is
In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C . Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.
In a counter-flow heat exchanger, the cold fluid enters at 20°Cand leaves at 40°C. The hot fluid enters at 140°C and leaves at 120°C. What is the heat transferred per unit area per unit overall heat transfer coefficient?
A heat exchanger is used to heat cold water (CP = 4.18 kJ/kg-K) entering at 15 °C at a rate of 1.2 kg/s by hot air (CP = 1.005 kJ/kg-K) entering at 90 °C at a rate of 2.5 kg/s. The highest rate of heat transfer in the heat exchanger is _____ kW.
After expansion from a gas turbine, the hot exhaust gases are used to heat the compressed from a compressor with the help of a counter flow compact heat exchanger of 0.6 effectiveness. The number of transfer units of the heat exchanger is _________.
In a counterflow heat exchanger the hot fluid is cooled from 140° to 110°C by a cold fluid which get heated from 70°C to 100°C . The overall heat transfer coefficient is 250 W/m2 – K and heat transfer area is 2 m2. If both the fluids have identical mass flow rate specific heat product. Then the heat transfer rate is (in kW) __________?
For the same inlet and outlet temperatures of hot and cold fluids, the Log Mean Temperature Difference (LMTD) is
For the parallel flow heat exchange the effectiveness is 0.4 and capacity ratio is unity, then NTU is___.
In a shell and tube heat exchanger, baffles are provided on the shell side to ________.