The Heat Transfer Coefficient For The Double Pipes Heat

1930 WordsOct 31, 20168 Pages
Purpose: The objective of this lab is to find the heat transfer coefficient for the double pipes heat exchanger in order to determine the best configuration for the double pipes heat exchanger. There are 4 possible configuration of the double pipes heat exhangers Cocurrent with variable flowate of cold stream while keeping hot stream flowrate constant. Cocurrent with variable flowrate of hot stream while keeping cold stream flowrate constant. Counter current with variable flowrate of cold stream while keeping hot stream flowrate constant. Counter current with variable flowrate of hot stream while keeping cold stream flowrate constant. Experimental Apparatus Figure 2: Double Pipe Heat Exchanger (Front) 1/ Inlet/Outlet valves 2/ Hot inlet stream 3/ Cocurrent/countercurrent valves 4/ Cold rotameter 5/ Hot rotameter 6/ Thermocouple dial 7/ Temperature display Figure 3: Double Pipe Heat Exchanger (Back) 1/ Pressurized Steam 2/ Pressurized Steam Valve 3/ Pressure gauge 4/ Main steam outlet Literature Theory We expect the temperature profile will follow this figure 4 below [3] Figure 4: Temperature profile of double pipe heat exchanger in cocurrent and countercurrent. Equations: ∆T_lm=(((T_Hi-T_Co )-(T_Ho-T_Ci)))/((ln⁡(T_Hi-T_Co)/(T_Ho-T_Ci )) ) Eq. 1. Log Mean Temperature Where: ΔTlm: log mean temperature difference, °C; TCi: cold water inlet temperature, °C; THo: hot water outlet temperature, °C; THi: hot water inlet temperature, °C; TCo: cold water outlet

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