Heat transfer, problem. Kern
5.9 In a counterflow concentric-pipe apparatus a liquid is cooled from 250 to 150 ºF by heating another from 125 to 150 ºF. The value of U1 at the cold terminal is 52 and at the hot terminal U2 is 58. At what liquid temperatures should U for the overall transfer be computed?
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11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids...
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Heat transfer 1) 2.5 m/s of air at 150°C is used to heat (0.25 + /250)=0.254...
Heat transfer
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Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there may be other modes of heat transfer present (e.g. radiation or conduction), but ignore those effects. For example, a hot ball bearing being dropped from a building roof. Ans. Forced, external convection over a sphere. a. Water flow through a fire hose from a hydrant. b. Heat transfer from a clothes iron sitting on an ironing board. c. Heat transfer from a climber trapped...
11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids are (200°C) and (60°C) gave outlet temperature of (110°C) for both sides as the surfaces were clean. After long time of use for same the inlet temperatures and flow rate, the hot fluid outlet was (130°C). Find the change in the overall heat transfer coefficient and the heat transfer values by percentage. Ans.: -37.4%, -22.2% 11.21 A liquid with a specific heat of (3200J/kg....
Problem X3-5, Heat Transfer, Spring 2018 A single-pass, double-tube counterflow heat exchanger will be used to heat a 0.14 kg/s stream of water nowing in the 12-mm diameter inside tube. The water in the inside tube enters the heat exchanger at 25 C. The water will be heated with a 0.12 kg/s m of hot water flowing in the annulus between the inside and outside tube that enters the heat exchanger at 80°C. UP the hot and cold streams, and...
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...
Question 3 A counter flow single pass double pipe heat exchanger is supplied with hot water at 120°C that is to be cooled by water entering at 20°C. The mass flow rate of the hot stream is 5 kg/s, and that of the cold stream is 6 kg/s. The specific heat capacity of both fluids may be taken as 4180 J/kg.K. The overall U value is 1500W/m2.K, and the surface area for heat transfer is 20 m2 a) Determine the...
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...
QUESTION 1: Heat Exchanges A concentric tube parallel floween s hot water saturated liquid from 30 to 90%Catate of St. The exh , having thermopla properties similar to air, enter and exit the exchange 254 and 100 p ectively. The heat force 1000 W/mK The water pipe has a diameter of 50 cm a) Determine the required length for the exchanger. b) Assuming water flow inside the tube to be fully developed, estimate the convection heat transfer coefficient c) If...
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems: 1. In a gas-faired boiler, water is boiler at 150 C by hot gases flowing through 59 m long, 5 cm outer diameter mechanically polished stailess-stell pipes submerged in water, If the outer surface temperature of the pipes is 180 °C. determine (a) the rate of heat transfer from the hot gases to water. (b) the rate of evaporation, (c) the ratio...
Problem 4: Heat Exchangers Analysis (25 points) A counterflow plate-type heat exchanger as shown in the figure below is used to cool propane fuel W 50 mm H 25 mm Saturated Vapor propane Thickness t =5 mm H 25 mm Cooling water Length L The flow rate of the cooling water is 0.2 kg/s, while the flow of the propane is 0.1 kg/s. The water enters the heat exchanger at a temperature of 20°C while the propane enters at its...
Heat transfer
1) 2.5 m/s of air at 150°C is used to heat (0.25 + /250)=0.254 kg/s of 20°C water. The heat exchanger is a finned-tube cross flow heat exchanger with both sides unmixed. The overall heat transfer coefficient associated with the hot side is 120 W/(m2 °C). The hot-side area is 20 m². Assume a constant specific heat for air and water of Cecair = 1.005 kJ/(kg °C), Crewater = 4.2 kJ/(kg). The pressure of the hot air is...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there may be other modes of heat transfer present (e.g. radiation or conduction), but ignore those effects. For example, a hot ball bearing being dropped from a building roof. Ans. Forced, external convection over a sphere. a. Water flow through a fire hose from a hydrant. b. Heat transfer from a clothes iron sitting on an ironing board. c. Heat transfer from a climber trapped...
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