Water (C, = 4.18kJ/kg K) at 80°C enters a counter flow heat exchanger with a mass flow rate of 0.5kg/s. Air (C, = 1kJ/kg K) enters at 30°C with a mass flow rate of 2.09kg/s. If the effectiveness of the heat exchanger is 0.8, the LMTD (in
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- THERMOFLUID A thin-walled double-pipe counter-flow heat exchanger is used to cool oil (C, = 2.20 kJ/kg.°C) from 150 to 40°C at a rate of 2 kg/s by water (c, = 4.18 kJ/kg.°C) that enters at 22°C at a rate of 1.5 kg/s. Determine the rate of heat transfer in the heat exchanger and the exit temperature of water.1. A crossflow heat exchanger, one fluid mixed and one unmixed (oil in tubes and steam in shell), is used to heat an oil in the tubes (c = 1.9 kJ/kg°C) from 15°C to 85°C. Steam (5.2 kg/s, c = 1.86 kJ/kg°C) blows across the outside of the tube, enters at 130°C and leaves at 110°C. U. = 275 W/m²K. Calculate A. [10.84 m²]In a parallel flow heat exchanger, with a cooler at 40 °C at a flow of 2 kg / h, hot water at 1 kg / h is cooled from 90 ° C to 60 ° C. The total heat transfer coefficient is 1000 W / m2K. Cph = Cpc = 4182 J / kgK. According to this; d) Assuming that the exit temperature of the hot fluid is not given, for the case of the parallel flow heat exchanger, take the area of 6.42 m2 and calculate the exit temperature of the hot water using the efficiency-NTU method.
- You as a Biochemical Engineer in an ezyme industries is assigned to handle a counter flow double pipe heat exchanger with A,= 9 m2 which used for cooling a fermentation broth (c, = 3.15 kJ/kg. K) at a rate of 10 kg/s with an inlet temperature of 90°C. The water used as coolant enters the heat exchanger at a rate of 8 kg/s with an inlet temperature of 10°C. The plant data gave the following equation for the overall heat transfer coefficient (in W/m².K): 600 %3D 1 2 • U.8 |m. where m. and m, are the cold and hot stream flow rates in kg/s, respectively.The stack gas from a chemical operation contains noxious vapors that must be condensed by lowering its temperature from 315C to 35C. The gas flow rate is 0.70 m^3/s. Water is available at 10C at 1.26kg/s. A counterflow heat exchanger will be used with a water flowing through the tubes. The gas has a specific heat of 1.10 kJ/kg-K and a gas constant of 0.26 kJ/kg-K. What is the rate of heat lost by the gas in KJ?The stack gas from a chemical operation contains noxious vapors that must be condensed by lowering its temperature from 315C to 35C. The gas flow rate is 0.70 m^3/s. Water is available at 10C at 1.26kg/s. A counterflow heat exchanger will be used with a water flowing through the tubes. The gas has a specific heat of 1.10 kJ/kg-K and a gas constant of 0.26 kJ/kg-K. What is the rate of heat lost by the gas? answ. 186.956 kJ 196.895 kJ 168.965 kJ 169.856 kJ
- Q.2. Air enters a steady-flow heat exchanger with a mass flow rate of 2 kg/s as shown in Figure. Determine (a) the rate of heat transfer to the air in the heat exchanger, (b) the power output from the turbine assuming no heat loss, and (c) the velocity at exit from the nozzle. (Cp atr = 1.005 kJ/kg. K) T=600 C T- 12 C V=3 m/s Air Нeat v-3 m/s Exchanger Turbine T= 200 C V - 25 m/s T= 160 C NozzleHot water enters at 46 ° C and leaves at 37 ° C, and cold water enters with 19 ° C to a well insulated adiabatic counter flow tube heat exchanger. The flow of hot water is 20 l / min and the flow of cold water is 800 l / h. The heat transfer surface area is 0.61 m2. (c = 4.18kJ / kgK, p = 998 kg / m³) a) Find the heat transfer coefficient. b) Draw the temperature distance (T-x) graph. (h = hot, c = cold fluid.)In a heat exchanger, water (Cp = 4200 j/kg.K ) is heated from 15 0 C to 350 C by a hot oil which has specific heat capacity of 2150 J/kg. K. Mass flow rate of the oil is 0.25kg/s & it’s temperature difference was 250 C after transferring the heat (T1= 750 C & T2 = 500 C). Mass flow rate of the water is 0.1kg/s. Calculate the efficiency of the heat exchanger If the efficiency of heat exchanger becomes 89%, what will be the final temperature of water? Explain how the changes in thermal efficiency of the heat exchanger can affect it’s behavioural characteristics.
- a. 5000kg of liquid A (?? 2.4 kJ/kg-deg) per hour is cooled from 90 C to 60 C through a counter flow heat exchanger. Liquid B (?? 1.7 kJ/kg-deg) is used as coolant, which is available at 35 C. The heat transfer surface area is 5 ?2. If the flow of coolant is 4000 kg/hr. Determine:i) Outlet temperature of the coolant (3.5marks)ii) Overall heat transfer coefficient (3.5marks)b) Two well-known statements of second law of thermodynamics – one on the conversion of heat energy, and the other about the transfer of heat appear to be unconnected at first sight, but in fact, they are equivalent in all aspects. Write down the statements and establish their equivalence. (5marks)c) A nozzle is used to increase the velocity of steady flow stream. The parameters at inlet and exit from the nozzle are given. (5marks)PARAMETERS INLET EXIT Enthalpy 3000 kJ/kg 2770 kJ/kgVelocity 60 m/s ?Area ?. ? ?? ?Specific volume 0.185 ?. ??? ??/??Calculate velocity of fluid as it leaves the nozzle, rate of flow of…Counterflow to cool the oil in the lubrication system of a large industrial gas turbine. A double-pipe heat exchanger is used. Coolant flowing through the inner pipe (Cp=4178) J/kg.°C) and oil flowing through the ring channel (Cp=2005.5 J/kg.°C) mass flow rates are 0.2 and 0.4, respectively kg/s. Oil enters the heat exchanger at 60 oC and leaves at 40 oC. Water inlet temperature 30 is oC. The heat transfer coefficient on the ring side is 500 W/m2K. Diameter of thin-walled inner tube is 25 mm, the inner diameter of the outer ring is 45 mm. Pollution resistance in the inner pipe where city mains water is used It is 0.000176 m2K/W. The deposit on the oil side is negligible. a) The heat transfer coefficient in the inner pipe b) Total heat transfer coefficient, c) Calculate the length of the heat exchanger. d) If a 4 m long hairpin is used in the heat exchanger, the required number of hairpins set.6. A heat exchanger was installed purposely to cool 0.50 kg of gas per second. Molecular weight is 28 and k=1.32. The gas is cooled from 150 deg C to 80 deg C. Water is available at the rate of 0.30 kg/s and at a temperature of 12 deg C. Calculate the exit temperature of the water.