FOOD ENG Q's
apples are peeled, cored, and pureed to produce an unpasteurized applesauce. The applesauce must be heated to 96°C to ensure that it is microbiologically stable for hot fill packaging. A tube-in-tube heat exchanger is used to heat the applesauce (Cp = 3.83 kJ/kgK) from an initial temperature of 10°C to the target temperature. Steam at 130°C with 70% quality is used as the heating medium with the condensate leaving the heat exchanger at 130°C.
(b) How much steam (mass flow rate in kg/hr) is required per kilogram of applesauce processed?
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FOOD ENG Q's
How many kg of steam will be necessary to heat 3532kg of milk from 20 C to 80 C if the steam is at 300Kpa and 100% quality and the condensate leaves at 100C? Cp of milk is 4.06 kJ/kgC. Assume milk has same density as water and heat from the steam goes to the milk
The ‘Condensate pre-heater’ shown in the process circuit for the Killingholme combined cycle is a counter...
The ‘Condensate pre-heater’ shown in the process circuit for the Killingholme combined cycle is a counter flow shell and tube heat exchanger heated by a heat transfer oil. In reality this would utilise waste heat from the heat recovery boiler but this has been simplified for the purposes of setting an assessment question, to just using hot oil. The heat transfer oil flows through the tubes and the condensate flows through the shell of the heat exchanger. The oil enters...
[10] Design Problem As shown in the figure below, a double-pipe parallel-flow heat exchanger is used...
[10] Design Problem As shown in the figure below, a double-pipe parallel-flow heat exchanger is used to heat cold fluid which is water (Cp = 4180 J/(kg.K), p = 1000 kg/m) from 20°C to 80°C at a rate of 0.15 kg/s. The heating is to be accomplished by hot fluid, which is geothermal water (Cp = 4310 J/(kg.K), p = 1050 kg/m²) available at 130°C at a mass flow rate of 0.25 kg/s. The inner tube has an inner diameter...
(LMTD method) A 2 shell, 4 tube pass heat exchanger is beingused to heat 40...
(LMTD method) A 2 shell, 4 tube pass heat exchanger is being
used to heat 40 kg/s of a process fluid in the tubes from an inlet
temperature of 15°C to a target temperature of 70°C using
condensing steam at 150°C. The overall heat transfer coefficient
for a clean heat exchanger was Uo=1500W/m2.°C, however, the design
engineer neglected to take into account fouling of the heat
exchanger. After 5 years of use, fouling has occurred with fouling
factors of 0.0005m2.°C/W...
3. In a shell-and-tube heat exchanger, under nominal condition a process stream (a liquid) is heated...
3. In a shell-and-tube heat exchanger, under nominal condition a process stream (a liquid) is heated from 100°C to 200°C without any phase change using a heating medium in the tube side, temperature of which gets reduced from 300°C to 150°C. The process side has a bypass which remains closed under nominal condition. Under nominal condition, there are equal resistances to heat transfer on shell and tube sides. It is desired that the process stream flowrate be increased by 30%,...
rate of 1.5 kg/s. The diameter of the tube is 2.5 cm, and its length is...
rate of 1.5 kg/s. The diameter of the tube is 2.5 cm, and its length is 6 m. Let the water inlet temperature vary from 5'C to 25"'C. Identify the graph that depicts the overall heat transfer coefficient as a function of the inlet temperature A thin walled double pipe counter flow heat exchanger is to be used to cool oil (c,-2200 J/kgK) from 150°C to 40°C at a rate of 2 kg/s by water (cp = 4180 J/kgK) that...
3.3 Electric Heating 8 marks One of the other engineers has suggested that electric immersion heaters...
3.3 Electric Heating 8 marks One of the other engineers has suggested that electric immersion heaters would be cheaper for heating the solution instead of the steam heat exchanger. a) If the site supply voltage is 414 V, 3-phase what would be the current required?[2] b) What would be the resistance of the heating element required for this duty? [2] c) Do you consider electric heating would be cheaper over the anticipated plant life of 20 years? You must justify...
MECH 3312 (Thermodynamics) Extra Credits01 Spring 2019 Q2.0 The gas-turbine portion of a combined...
MECH 3312 (Thermodynamics) Extra Credits01 Spring 2019 Q2.0 The gas-turbine portion of a combined gas-steam power plant has a pressure ratio of 18. Air enters the compressor at 350 K at a rate of 15.5 kg/s and is heated to 1580 K in the combustion chamber. The combustion gases leaving the gas turbine are used to heat the steam to 417'C at 10 MPa in a heat exchanger. The combustion gases leave the heat exchanger at 430 K. The steam...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
[10] Design Problem As shown in the figure below, a double-pipe parallel-flow heat exchanger is used to heat cold fluid which is water (Cp = 4180 J/(kg.K), p = 1000 kg/m) from 20°C to 80°C at a rate of 0.15 kg/s. The heating is to be accomplished by hot fluid, which is geothermal water (Cp = 4310 J/(kg.K), p = 1050 kg/m²) available at 130°C at a mass flow rate of 0.25 kg/s. The inner tube has an inner diameter...
(LMTD method) A 2 shell, 4 tube pass heat exchanger is being
used to heat 40 kg/s of a process fluid in the tubes from an inlet
temperature of 15°C to a target temperature of 70°C using
condensing steam at 150°C. The overall heat transfer coefficient
for a clean heat exchanger was Uo=1500W/m2.°C, however, the design
engineer neglected to take into account fouling of the heat
exchanger. After 5 years of use, fouling has occurred with fouling
factors of 0.0005m2.°C/W...
3. In a shell-and-tube heat exchanger, under nominal condition a process stream (a liquid) is heated from 100°C to 200°C without any phase change using a heating medium in the tube side, temperature of which gets reduced from 300°C to 150°C. The process side has a bypass which remains closed under nominal condition. Under nominal condition, there are equal resistances to heat transfer on shell and tube sides. It is desired that the process stream flowrate be increased by 30%,...
rate of 1.5 kg/s. The diameter of the tube is 2.5 cm, and its length is 6 m. Let the water inlet temperature vary from 5'C to 25"'C. Identify the graph that depicts the overall heat transfer coefficient as a function of the inlet temperature A thin walled double pipe counter flow heat exchanger is to be used to cool oil (c,-2200 J/kgK) from 150°C to 40°C at a rate of 2 kg/s by water (cp = 4180 J/kgK) that...
3.3 Electric Heating 8 marks One of the other engineers has suggested that electric immersion heaters would be cheaper for heating the solution instead of the steam heat exchanger. a) If the site supply voltage is 414 V, 3-phase what would be the current required?[2] b) What would be the resistance of the heating element required for this duty? [2] c) Do you consider electric heating would be cheaper over the anticipated plant life of 20 years? You must justify...
MECH 3312 (Thermodynamics) Extra Credits01 Spring 2019 Q2.0 The gas-turbine portion of a combined gas-steam power plant has a pressure ratio of 18. Air enters the compressor at 350 K at a rate of 15.5 kg/s and is heated to 1580 K in the combustion chamber. The combustion gases leaving the gas turbine are used to heat the steam to 417'C at 10 MPa in a heat exchanger. The combustion gases leave the heat exchanger at 430 K. The steam...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
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