For heat transfer class convectuve heat transfer 320 K and i) it is immersed in still air at 300 K. 2 atm pressure...
4. The heat exchanger, shown below, is being used to generate vapor from saturated water at 385-K. The other side of the exchanger is condensing saturated steam at 400-K、The heat exchanger has 15, S-cm ID thin-wall copper tubes, each 10-em long between the tube sheets. Calculate the steam condensation heat transfer coefficient for the tubes of this exchanger Calculate the rate of exchanger (10) a. vapor generation (kg/sec), m, in the tubes of this (10) a. 400 k 帛? 40...
Water is boiled at atmospheric pressure by horizontal polished copper heating 5 mm immersed in water. If the surface temperature of element of diameter D the heating wire is 350 °C, determine the rate of heat transfer from the wire to the water per unit length of the wire. Pl aim Heating element 100°C Vapor Water at saturation and 1.0 atm pressure is heated by a wire of diameter 0.127 cm. Its temperature is above boiling temperature by 650 °C....
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
12) A scuba tank contains an air at 300 kPa and 600 K. Half of the air is withdrawn from the tank leaving the tank at a pressure of 100 kPa. Assuming no heat transfer, what is the temperature of the gas when the process is complete? (a) 100 K (b) 200 K (c) 300 K (d) 400 K (e) 500 K 13) A 0.6875 cubic meter rigid tank contains 0.5 kg of steam at 0.4 Mpa. The steam is...
12) A scuba tank contains an air at 300 kPa and 600 K. Half of the air is withdrawn from the tank leaving the tank at a pressure of 100 kPa. Assuming no heat transfer, what is the temperature of the gas when the process is complete? (a) 100 K (b) 200 K (c) 300 K (d) 400 K (e) 500 K 13) A 0.6875 cubic meter rigid tank contains 0.5 kg of steam at 0.4 Mpa. The steam is...
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...
Heat transfer bla 5 Consider a stainless steel spoon(k = 15.1 W/m.K), partially immersed in the (4 boiling water at 95°C in a kitchen at 25°C. The handle of the spoon has a cross-section 0.2 cm x 1 cm and it extends 18 cm in the air from the free surface of the water. If the heat transfer coefficient on the exposed surface of the spoon is 15 W/m2.K, calculate the temperature difference across the exposed surface of the spoon...
Problem Statement: Design a tubular feed-water heater which need to heat the 1.5 kg/s of water from 20°C to 60°C. Constraints: a) Heating of water need to be done by saturated steam which is condensing at 1 MPa & heat transfer coefficients (on steam side) is 6500 W/m2K b) Max. Velocity of water 1.0 m/s c) Three different copper tube inner diameters 2.0 cm, 2.5 cm and 3.0 cm. d) Thickness of copper tubes 10% of the inner diameter Deliverables:...
P2) (50 pts.) The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies, since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3...
Twenty [kw] of heat is to be removed from 375 [k] water flowing at 0.15 [kg/s] into the inner pipe of concentric tube heat exchanger. Cooling water enters the annulus at 290 [k] and leaves at 320 [k] with a flow in the opposite direction of the inner flow. The diameter of the thin- walled inner pipe is 2.5 [cm] a) b) c) Calculate the exit temperature of the hot fluid and the mass flow rate of the cold fluid...