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- Hot fluid enters at a flow rate of 3 kg/sec with an inlet temperature of 150 C while cold fluid enters 5 kg/sec and with an inlet temperature of 60 C. Determine the maximum heat transfer that can happen during the heat exchange process? Take specific heat value of the fluid as 2000 J/(kgC)Hot fluid enters at a flow rate of 3 kg/sec with an inlet temperature of 150 C while cold fluid enters 5 kg/sec and with an inlet temperature of 60 C. Determine the maximum heat transfer that can happen during the heat exchange process? Take specific heat value of the fluid as 2000 J/(kgC) not sufficient information 150 kW 1 MW 540 kW none of the given 900 kW5. Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300 °C and leave at 100 °C, are used to heat pressurized water at a flow rate of 1 kg/s from 35 °C 125 °C. The specific heat of water at the average water temperature is 4197 J/kg. K. The overall heat transfer coefficient based on the gas-side surface area is Uh = 100 W/m².K. Determine the required gas-side surface area A₁ using the LMTD and & -NTU method.
- A counterflow heat exchanger is designed to cool 0.65 kg/sec of oil with specific heat Cp=3.4 KJ/kg-K from 150°C to 70°C. Water for cooling, Cp = 4.18KJ/kg-K is available at 20°C and flow rate of 0.6 kg/sec. Calculate the length of a 3.5 cm inside diameter tubing in meters. The overall coefficient of heat transfer is 90 W/m²-K. O 452 O 337 O 543 O 2962- In a heat exchanger, steam of 0.08 bar and a specific steam content of 95% is condensed. 381.6 tons / h cooling water with a temperature of 10 ̊C flows in parallel connected tubers with inner / outer diameter 28/30 mm with a speed of 0.65 m / s. The heat transfer surface of the heat exchanger is 220 m2 and it has a k-value of 2200 W / (m2K) . Assume the specific heat capacity of the water 4.18 kJ / (kg K) and density 1000 kg / m3. The K-value is attributed to the outer mantle surface of the tubes. a) Calculate the outlet temperature of cooling water. b) How many tonnes of steam per hour are condensed? c) Determine the number of tubes and tube lengthProblem 2 An air-to-air heat recovery unit uses across-flow exchanger with both fluids unmixed and an airflow rate of 0.5 kg/s on both sides. The hot air enters at 400 °C while the cool air enters at 20 °C. Calculate the exit temperatures for U = 40 W/m². °C and a total exchanger area of 15 m². Take the specific heat of air 1006 J/kg.°c.
- 5. Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300 °C and leave at 100 °C, are used to heat pressurized water at a flow rate of 1 kg/s from 35 °C 125 °C. The specific heat of water at the average water temperature is 4197 J/kg. K. The overall heat transfer coefficient based on the gas-side surface area is U₁ = 100 W/m².K. Determine the required gas-side surface area A₁ using the LMTD and & -NTU method.Water enters a crossflow exchanger (with both fluids unmixed) at 16◦C and flows at 7.5 kg/s. It is used to cool air flowing at ◦22 10 kg/s which enters at 120 C. The exchanger has an overall heat transfer coefficient of 225 W/m /K and a surface area of 225 m . Data: Specific heat of air = 1014 J/kg/K; Specific heat of water = 4182 J/kg/K. (a Calculate the effectiveness of the exchanger(b Determine the heat transfer rate in the exchanger(c Determine the exit temperature of air(d After prolonged use the exchanger is affected by fouling, with a fouling factor of 2 × 10−3 m2/W/K. Determine the heat transfer rate in the exchanger with fouling.2. A heat exchanger like that is used to heat an oil in the tubes (c = 1.9 kJ/kg °C) from 15-C to 85 °C. Blowing across the outside of the tubes is steam that enters at 130-C and leaves at 110°C with a mass flow of 5.2 kg/sec. The overall heat-transfer coefficient is 275 W/m² °C and c for steam is 1.86 kJ/kg C. Calculate the surface area of the heat exchanger (Holman, 2002). 130 85 Steam Oil 110
- Liquid food is heated in a tubular heat exchanger. The inner pipe wall temperature is 110 ° C. The internal diameter of the pipe is 35 mm. Product flows at 0.5 kg / s. If the initial temperature of the product is 7 ° C, calculate the convective heat transfer coefficient. The thermal properties of the product are as follows: specific heat = 3.7 kJ / (kg ° C), thermal conductivity = 0.6 W / (m ° C), product viscosity = 500 x 10-6 Pa s, density = 1000 kg / m³ , the product viscosity at 110 ° C = 410 x 10-6 Pa s. a. Find Reynold's number = b. Find the number Prantl = c. Find the Nuselt number = d. Convection coefficient =....... W/m² °CQUESTION 8 Cold water (C, = 4180 J/kg.°C) enters the tubes of a heat exchanger with 2-shell passes and 20 tube passes at 20 °C at a rate of 3 kg/s, while hot oil (C, = 2200 J/kg.°C) enters the shell at 130 °C at the same mass flow rate and leaves at 60°C. If the overall heat transfer coefficient based on the outer surface of the tube is 300 W/m².°C, determine; i. the rate of heat transfer and ii. the heat transfer surface area on the outer side of the tube.In a countercurrent double-pipe heat exchanger, the hot oil entering the inner tube at 420 K with a flow rate of 60 g/s is required to be cooled to 320 K. In the space between the outer tube and the inner tube of the heat exchanger, cooling water flows at the same linear speed as the oil. Cooling water enters the heat exchanger at 290 K. The inner tube inner diameter of the heat exchanger is 25 mm and the outer tube inner diameter is 40 mm. Calculate the length of the heat exchanger. The oil side heat transfer coefficient is 1.6 kW/m2 K, and the water side heat transfer coefficient is 3.6 kW/m2 K. The densities of oil and water can be taken as 0.8 and 1.0 g/cm3, respectively, and the specific heats of oil and water can be taken as 2.0 and 4.2 kJ/kg K, respectively. Wall effects can be neglected. Flow cross-sectional area = (PI)*D2 /4 F2