An 8 m3 batch of oil with specific heat of 2 kJ/(kg K) and density of...
An 8 m3 batch of oil with specific heat of 2 kJ/(kg K) and density of 850kg/m3 is being heated in a steam-jacketed, agitated vessel with 1.5 m2 of heating surface. The convective heat-transfer coefficient on the oil side is 500W/(m2K), and 10,000 W/(m2K) on the steam side. If the steam temperature is 130°C and the initial temperature is 20 °C, estimate the oil temperature after 10 minutes.
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An 8 m3 batch of oil with specific heat of 2 kJ/(kg K) and
density of...
When the liquid temperature has reached 353 K the steam supply is turned off for two...
When the liquid temperature has reached 353 K the steam supply is turned off for two (2) hours (7.2 ks) and the vessel cools. What is the minimum temperature reached by the vessel? A vessel of 6.0 m^2 outside diameter contains 1.0 tonne (1.0 of Mg) of a liquid of specific heat capacity 4.0 kJ/kg K. The vessel is heated by steam at 393.0 K which is fed to a coil immersed in the agitated liquid and heat is lost...
Chemical reactors sometimes use batch processes to heat chemical compounds in a transient heating operation. Assume...
Chemical reactors sometimes use batch processes to heat chemical compounds in a transient heating operation. Assume that a chemical compound of density p = 1400 kg/m and specific heat c = 2500 J/kg/K is in a batch reactor of volume of V = 3.5 m in an insulated vessel. The chemical is to be heated from cold storage temperature of T; = 260 K, to a process temperature of T = 420 K by passing saturated steam at Th =...
1. Engine oil (c-2100 J/kg- C) is to be heated from 20 °C to 60 °C...
1. Engine oil (c-2100 J/kg- C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cm diameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfs 2174 kJ/kg) a. For an overall heat transfer coefficient of 650 W/m2-°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2 kW; 7.0...
(40 pts) Shell-and-Tube Heat Exchanger to make Jell-O Cups A counter-current shell-and-tube heat exchanger is used...
(40 pts) Shell-and-Tube Heat Exchanger to make Jell-O Cups A counter-current shell-and-tube heat exchanger is used to heat Jell-O solution (water + gelatin) using saturated steam on the shell side. Jell-O solution must be heated to at least 80 oC, poured into individual plastic cups, and then cooled to make the solid Jell-O cups. The Jell-O solution is heated with steam that enters the shell at 2.0 bar (Tsteam = 120oC) and exits as a saturated liquid. At this temperature...
Prior to making a polymer solution for coating plastic film a solvent is pumped into a...
Prior to making a polymer solution for coating plastic film a solvent is pumped into a jacketed carbon steel, Teflon®-lined vessel that is 3 m in diameter with a straight side of 4 m. The liquid depth is 3 m and the jacket extends 3 m up the vessel side. The vessel has an agitator installed. The impeller is a glass-lined hydrofoil that is 1210 mm in diameter with a power number of 0.39 operating at 125 RPM. The fluid...
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 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the sam...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
One of the industrial process is to heat a vegetable oil to a specific temperature by...
One of the industrial process is to heat a vegetable oil to a specific temperature by passing the oil through a metal coil that is placed in a warm water path. The oil flows in the coil with a mass flow rate of 0.05 kg/s at 20◦C. The coil consists of ten turns with a diameter of 50 cm that is made copper tubing (350 W/m. K) of 1 cm inside diameter with a 2 mm wall thickness. The total...
Air compressors are sometimes installed in four-wheel drive vehicles to allow for maintaining tyre pressures whilst in the outback. One notable problem with this system is the increase in air temperat...
Air compressors are sometimes installed in four-wheel drive vehicles to allow for maintaining tyre pressures whilst in the outback. One notable problem with this system is the increase in air temperature during compression, which leads to the heating up of metallic fittings on the compressor and hose, posing a thermal risk to operators. The compressor compresses air isentropically from atmospheric pressure to 300 kPa. The inlet air temperature is 300K. (a) What is the temperature of the air at the...
1. At a particular small Dairy Facility, milk [Density 1030 kg/m1 and Specific Heat Capacity 3860...
1. At a particular small Dairy Facility, milk [Density 1030 kg/m1 and Specific Heat Capacity 3860 J/kg.K] is produced at a flowrate of 200 Vhr at a temperature of 38.6°C. This milk must then be chilled to a storage temperature of 12°C. Groundwater at 9°C is available at a flowrate of 0.6 m'/hr. A Shell and Tube Heat Exchanger with 2 Shell passes and 8 Tube passes is used for this heat exchange process. The Oveall Heat Transfer Coefficient is...
When the liquid temperature has reached 353 K the steam supply is turned off for two (2) hours (7.2 ks) and the vessel cools. What is the minimum temperature reached by the vessel? A vessel of 6.0 m^2 outside diameter contains 1.0 tonne (1.0 of Mg) of a liquid of specific heat capacity 4.0 kJ/kg K. The vessel is heated by steam at 393.0 K which is fed to a coil immersed in the agitated liquid and heat is lost...
Chemical reactors sometimes use batch processes to heat chemical compounds in a transient heating operation. Assume that a chemical compound of density p = 1400 kg/m and specific heat c = 2500 J/kg/K is in a batch reactor of volume of V = 3.5 m in an insulated vessel. The chemical is to be heated from cold storage temperature of T; = 260 K, to a process temperature of T = 420 K by passing saturated steam at Th =...
1. Engine oil (c-2100 J/kg- C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cm diameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfs 2174 kJ/kg) a. For an overall heat transfer coefficient of 650 W/m2-°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2 kW; 7.0...
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 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
1. At a particular small Dairy Facility, milk [Density 1030 kg/m1 and Specific Heat Capacity 3860 J/kg.K] is produced at a flowrate of 200 Vhr at a temperature of 38.6°C. This milk must then be chilled to a storage temperature of 12°C. Groundwater at 9°C is available at a flowrate of 0.6 m'/hr. A Shell and Tube Heat Exchanger with 2 Shell passes and 8 Tube passes is used for this heat exchange process. The Oveall Heat Transfer Coefficient is...
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