6. If the mass flow rate of cold fluid is 3 liters per minute, and inlet and outlet temperatures are 20 and 40°C, calculate the heat gained by the cold fluid. The specific heat capacity of hot fluid is 4000J/kg °C. 7. For above problem calculate the log mean temperature difference (LMTD) if both fluids are flowing in same direction. 8. For above problem calculate the log mean temperature difference (LMTD) if both fluids are flowing in opposite direction.
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Given: - Mass flow rate of cold fluid = 3 liters per minute - Inlet temperature = 20°C - Outlet temperature = 40°C - Specific heat capacity of hot fluid = 4000 J/kg °C We can use the formula: Q = m * c * ΔT Where: Q = Heat gained m = Mass flow rate c = Specific Show more…
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A hot fluid passes through a thin-walled tube of 10-mm diameter and 1-m length, and a coolant at T∞ = 25°C is in cross flow over the tube. When the flow rate is ṁ = 18 kg/h and the inlet temperature is Tm,i = 85°C, the outlet temperature is Tm,o = 78°C. Assuming fully developed flow and thermal conditions in the tube, determine the outlet temperature Tm,o if the flow rate is increased by a factor of 2. That is, ṁ = 36 kg/h, with all other conditions the same. The thermophysical properties of the hot fluid are ρ = 1079 kg/m³, cp = 2637 J/kg ⋅ K, μ = 0.0034 N ⋅ s/m², and k = 0.261 W/m ⋅ K. Tube: D = 10 mm, L = 1 m. Coolant: T∞ = 25°C. Hot fluid: Tm,i = 85°C, ṁ = 18 kg/h.
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