A finned-tube, crossflow heat exchanger is used to heat pressurized water in a gas turbine system. In this system, the cold fluid is liquid water and hot fluid is air. Laboratory measurements are performed on a prototype version of the exchanger, which has a surface area of 8 m2, to determine the overall heat transfer coefficient. Measurements were made when mh = 1.5 kg/s, Th,i = 325 C, mc = 0.5 kg/s, Tc,i = 25 C, Tc,o = 125 C A. Determine the effectiveness (ε), heat capacity ratio (Cr), NTU and UA product of this heat exchanger. To determine the substance’s properties, take the air’s properties from 225°C. B. Determine NTU again using the using the Fig. 11.14. Roughly sketch the figure and explain how you obtain the NTU using this graph.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
A finned-tube, crossflow heat exchanger is used to heat pressurized water in a gas turbine system. In this system, the cold fluid is liquid water and hot fluid is air. Laboratory measurements are performed on a prototype version of the exchanger, which has a surface area of 8 m2, to determine the overall heat transfer coefficient. Measurements were made when mh = 1.5 kg/s, Th,i = 325 C, mc = 0.5 kg/s, Tc,i = 25 C, Tc,o = 125 C
A. Determine the effectiveness (ε), heat capacity ratio (Cr), NTU and UA product of this heat exchanger. To determine the substance’s properties, take the air’s properties from 225°C.
B. Determine NTU again using the using the Fig. 11.14. Roughly sketch the figure and explain how you obtain the NTU using this graph.
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