Air at a mean temperature of 50 F flows over a thin-wall 1-in. O.D. tube, 10 feet in length, which has condensing water vapor flowing inside at a pressure of 14.7 psia. Compute the heat transfer rate if the average heat transfer coefficient between the air and tube surface is
Want to see the full answer?
Check out a sample textbook solutionChapter 1 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Additional Engineering Textbook Solutions
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
Engineering Mechanics: Dynamics (14th Edition)
Engineering Mechanics: Statics & Dynamics (14th Edition)
Foundations of Materials Science and Engineering
Manufacturing Engineering & Technology
Vector Mechanics For Engineers
- Q) Compare the heat transfer coefficients under the following conditions (Assume flow is turbulent). (1) Two fold increase in the diameter of the tube; the flow velocity is maintained constant by a change in the rate of liquid flow. (2) Two fold increase in the flow velocity by varying the mass flow rate. Comment on. the results.arrow_forward5. Steam condensing on the outer surface of a thin-walled circular tube of 50 mm diameter and 6 m length maintains a uniform surface temperature of 100 C. Water flows through the tube at a rate of m= 0.25 kg/s, and its inlet and outlet temperatures are Tmi = 15 C and Tmo = 57C. What is the average convection coefficient associated with the water flow? Data: Pvater = 1000 kg/m³ ; c, = 4.2 kJ/kg-K.arrow_forwardThe condenser of a steam power plant consists of AISI 302 Stainless steel tubes, each with outer and inner diameters of 35 mm and 30 mm, respectively. Saturated steam at 0.135 bar condenses on the outer surface of the tube, while water at a mean temperature of 295 K is in fully developed flow through the tube (you can assume that 295 K is the mean temperature in the axial direction of the tube (e.g. along its length) or you may assume that the inlet water temperature is 295 K). For a water mass flow rate of 0.22 kg/s, what is the outer surface temperature of the tube and the rates of heat transfer and steam condensation per unit tube length? As an approximation you may evaluate the properties of the liquid film at the saturation temperature.arrow_forward
- AS& Heat Transfer in Steam Heater Water at an average of 70°F is fiowing in a 2-in. steel pipe, schedule 40. Steam at 220°F is condensing on the outside of the pipe. The con vective coefficient for the water inside the pipe is A = 500 btu/h ft2.°F and the con- densing steam cocfficient on the outside is h = 1500 (a) Calculate the heat loss per unit length of1 ft of pipe using resistances. (b) Repcat, using the overall based on the inside area Ap (c) Repeat, using U 13.2- Ans. (a)q= 26 710 btu/h (7.828 kW). (b) Uj = 329.1 btu/h-ft2."F (1869 W/m2. K), (c) U.= 286.4 btu/h ft2.°F (1626 W/m2. K)arrow_forwardA two effect system of evaporators with parallel forward feed flow of liquid and vapor is to be designed to concentrate continuously 10,000 Ib/h of a 10% by weight solution to 40%, the feed being at 150 °F. It is planned to use saturated steam condensing at 220 °F. Specific Heat of feed liquor is 0.9, while that leaving the first effect is equal to the average specific heat of feed and product. The overall heat transfer coefficients are 300 and 400 BTU/(f2-hr-°F) for the first and second effects respectively. The latent heat of vaporization for the vapor leaving the first effect is 1002.3 BTU/lb and 1020 BTU/lb for the second. Calculate for the steam economy and the heat transfer area in each effect. Given: (1) Required: andarrow_forwardIndustrial pipes For externally insulated pipes, is it necessary to use skids in the region of contact between them and the sleepers?arrow_forward
- Only answer if you are 100% sure otherwise i will downvote... An ASTM B75 copper tube sheathes a heating element that is used to boil water at 1254 kPa. The copper tube is immersed horizontally in the water, and its surface is polished. The tube diameter and length are 5 mm and 9.5 cm, respectively. The maximum use temperature for ASTM B75 copper tube is 204°C. Determine the highest evaporation rate of water that can be achieved by the heater without heating the tube surface above the maximum use temperature. Use the property tables to calculate the properties of water at saturation temperature. The surface tension 0 at 190°C is 0.03995 N/m. Also, Csf 0.0130 and 10 for the boiling water on a polished copper surface. The highest evaporation rate of water is g/s?arrow_forwardA thick-walled cylinder tubing of hard rubber having an inside radius of 20mm is being used as temporary cooling coil in a bath. Ice water is flowing rapidly through inside tube and the inside wall temperature is 274.9K. The outside surface temperature is 297.1K. A total of 14.65W must be removed from the bath by cooling coil. How many m of tubing are required?arrow_forwardCurrent Attempt in Progress Consider pressurized water, engine oil (unused), and Nak (22 %/78%) flowing in a 20-mm-diameter tube. (a) Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366 K and the flow rate is 0.014 kg/s. (b) Determine the mass flow rate, in kg/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for water and engine oil at 300 and 400 K and a mean velocity of 0.018 m/s. Part A Your answer is incorrect. Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366 K and the flow rate is 0.014 kg/s. Liquid water engine oil Nak (m/s) ! i XALA(M) xer (m) Attempts: unlimited Submit Answerarrow_forward
- 2arrow_forwardProblem 2: A 5mm x 20 mm rectangle tube houses fully-developed flow of water. The surface temperature is 45°C, and the water enters at 25°C and exits at 35°C. What is the heat transfer.arrow_forwardConsider pressurized water, engine oil (unused), and Nak (22%/78%) flowing in a 20-mm-diameter tube. (a) Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366 K and the flow rate is 0.01 kg/s. (b) Determine the mass flow rate, in kg/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for water and engine oil at 300 and 400 K and a mean velocity of 0.022 m/s. Part A Determine the mean velocity, in m/s, the hydrodynamic entry length, in m, and the thermal entry length, in m, for each of the fluids when the fluid temperature is 366K and the flow rate is 0.01 kg/s. Liquid Um (m/s) Xfdh (m) Xfd,t (m) water i engine oil i i i Nak iarrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage LearningRefrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning