(i) What effect does the heat loss have on the value of heat transfer coefficie (ii) Is it important to consider heat losses from the insulation? (iii) What errors may be introduced by measuring heat transfer coefficient b method? (iv) Carry out the sensitivity analysis of heat transfer coefficient in term
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A: Data given- D= 150 mm = 0.15 m R= 75 mm = 0.075 m K = 1.4 W/mK w= 0.3 m T∞ = 0°C h= 25 w/m2k Ti=…
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A: As per company policy, we are restricted to solve one question at a time. Please ask other question…
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A: The expression for the total thermal resistance of the house wall is given by as follows
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A: Given that, Temperature of coolant, T=-20 °C,Outer diameter of wire, do=10 mm,Temperature of air,…
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A: Given,
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A: Given data: The thickness of steel, LS = 6 mm. Inside surface temperature, Ti = 100°C. Ambient…
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A: To provid two sample question regarding Heat transfer between two fluids separated by walls of a…
Q: A 1 m x 1.25 m hot surface at 300 C is to be cooled by attaching a rectangular fins (k = 200 W/m K)…
A: Solution:
Q: A steam pipe with 80 mm diameter passes through a room at 25°C (both air and walls). The pipe is…
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Q: Explore the effect of insulation thickness on the heat loss q and the temperature of the nsulation…
A: The problem can be sketched as follows,
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Q: A steam pipe 100mm external diameter is to be lagged with two layers of different lagging material…
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Q: why is the fouling factor detrimental? Relate your explanation to the concept of the overall heat…
A: In case of heat exchanger, there are tubes made of metal and flowing fluid (water or any other…
Q: Consider an aluminum heat sink (k =240 W/m-K), where the inner and outer widths of the square…
A: Energy balance at node 1:h(∆x2)(T∞-T1)+k(∆y2)(T2-T1∆x)+k(∆x*1)T5-T1∆y=0-{3+h∆xk}T1+T2+2T5+h∆xkT∞=0…
Q: Q2/ A hot surface at 100 C is to be cooled by attaching 27778 copper fins (k-237 w/m.K), 3 cm long…
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Q: (2) Calculate the heat flux and overall heat transfer coefficient for two-layer wall, which consists…
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Q: 1. Heat transfer from a 2m diameter sphere to a 21°C air stream over a time interval of one (1) hour…
A: Given data:
Q: A thick-walled tube of stainless steel [18% Cr, 8% Ni, k= 19 W/m - °C] with 2-cm inner diam- eter…
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Q: 300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe…
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Q: What is heat transfer coefficient?
A: The heat transfer constant or film constant, or film effectiveness, in physical science and in…
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Q: Determine the convection heat transfer resistance on the inside of the pipe per unit length, in…
A: R, convection i=1/hi*Ai =(1/450*π*0.150*1). L=1(unit length) =4.716*10^-3 =4.716mK/W
Q: 300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe…
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A: Given Data : k = 186 W/mK Height H = 0.15 m Outside diameter d = 50 mm radius r = 25 mm Outside…
Q: A 1 m x 1.25 m hot surface at 300°C is to be cooled by attaching a rectangular fins (k = 200 W/m-K)…
A: Solution:
Q: 300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe…
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Q: Determine the rate of heat transfer and the overall heat transfer coefficient for the composite wall…
A: Given Data The initial temperature is:T∞1=100°C The initial heat transfer coefficient is:h1=6…
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Q: Mechanical Engineering Question
A: Given:
Q: increase in the rate of heat transfer of the finned wall compared to the bare wall.
A: Given: h= 1 m w= 1 m Fin: L=2.5 cm =0.025 m t=0.25 cm= 0.0025 m h=35 W/m2K no of fins =100 To…
Q: Water flows on the inside of a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the…
A: Given data: Inner diameter (d) = 2.5 cm = 0.025 m Thickness of the wall…
Q: Steam at 320oC flows in a stainless steel pipe k = 15 W/mK, whose inner and outer diameters are 5cm…
A: Thermal circuit shown below For steel pipe inner radius r1=5×10-22=2.5×10-2 mouter radius…
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Q: A 0.5-ampere current is flowing through a long electrically conducting cylindrical rod. The diameter…
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Q: Question : A 100 mm- diameter, thin walled duct covered with a 50 mm-thíck layer of insulation (ki =…
A: INTRODUCTION : Heat losses from the hot fluid always occur when hot steam is conveyed out through…
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- What is the rate of rice husk consumption of a 2-ton grain dryer requiring to dry paddy from 22 to 14% in 8 hrs. The dryer overall thermal efficiency is 45%. Assume a heat of vaporization for paddy of 600 kCal/kg of moisture evaporated and heating value for rice husk of 3,000 kcal/kg.Two inches of urethane foam will reduce heat loss close to 1000% when applied to a 2-inch diameter uninsulated steel pipe. Assume the pipe wall thickness is 0.25-inches, the pipe interior convective heat loss (hi) is 500 BTU/hr-ft2-oF, and the pipe outside convective heat loss ho 20 BTU/hr-ft2-oF, k steel is 25 BTU/hr-ft-oF, and k insulaton is 0.023 BTU/hr-ft-oF. (hint - calculate heat loss with and without insulation.What is the use of "Feed Water Loop" in Thermal Design? Explain briefly.
- Project 3: It is vital to optimize the heat loss from a house through well designed composition and proper selection of the insulation layer of the wall layers. Your role as a thermal power engineer to investigate the heat transfer performance of a composite walls. Your head of department asked you to analyze the composite walls structure in Figure.3 and determine the steady rate of heat transfer and total heat loss, if the following design specifications must be met: _Indoor room temperature must be maintained at 20??. − Outdoor temperature mostly is -10?? in a hard winter. − Wall is made of plywood with thermal conductivity constant of ?? = 0.115 ?/(?.?) . − Fiberglass insulation is used with thermal conductivity constant of ?? = 0.045 ?/(?.?) . − Plaster board is used as inner layer for decoration purpose with thermal conductivity constant of ?? = 0.27 ?/(?.?) . − Convection heat transfer coefficients for indoor and outdoor are ℎ?? = 34 ?/(?2.?) and ℎ?? = 65 ?/(?2.?) , respectively.…(a) In thermal systems design projects various cost estimation methods can be followed depending on the nature of the project. Discuss at least four costing methods that can be applied in the thermal systems design and compare the strength and weakness of each method. (minimum 250 words). (b) Which method of costing do you think is appropriate for your thermal system design project? Discuss your justifications why you prefer the particular cost estimation method. (c) In the design process of air conditioning systems discuss the key steps you should carry out before production and installation of the system.While working for an interdisciplinary team you are tasked with the design of a heat exchanger. As with all team projects you are given restrictions on your design. The heat exchanger must be as compact as possible, and the team leader has decided on a 2 shell, and 8 tube pass system. It must capable of transferring 1.95 kW of heat. The team is asked to heat glycerine, moving at 0.75 m/s through the tubes from 5 ◦C to 40 ◦C. Hot water enters 4 cm thin walled tubes at 90 ◦C and leaves at 50 ◦C. If the water has a heat transfer coefficient of 138 W/m2 K determine the total length of tube required.
- Q1. Well water contained in an AISI 304 SS pipe network for chemical treatment and posterior distribution by aerial water pipes to different locations in a food manufacturing facility was analysed. The AISI 304 SS pipe network had an approximate 300 m length, 154 mm diameter and 2.0 mm wall thickness. The AISI 304 SS pipes were welded using a Tungsten Inert Gas (TIG) welding procedure. In-situ weld quality assurance was tested by pressurized WW, and no pinhole leakage was detected. After the pipe network remained out of service for 6 months at room temperature containing stagnant, pressurized well water, pitting corrosion was observed on the weld joints and the base material by the presence of multiple pinhole leaks.(a) Discuss, with chemical equations if relevant, TWO corrosion events that may have caused the pitting corrosion.(b) What practical steps could have been taken to mitigate for this potential outcome?(c) Identify corrosion inhibition methods to mitigate for the corrosion…Question No. 18:(a) What are the approximate chemical composition of gasoline, LPG, diesel, natural gas & methanol? How presence of moisture in air does affects the outcome of a combustion process. (b) A composite wall is formed of a 2.5 cm copper plate (k = 355 W/m.K), a 3.2 mm layer of asbestos (k = 0.110 W/m.K) and a 5 cm layer of fibre plate (k = 0.049 W/m.K). The wall is subjected to an overall temperature difference of 560°C (560°C on the Cu plate side and O°C on the fiber plate side). Estimate the heat flux through this composite ~all and the interface temperature between asbestos and fibre plate.Build a spreadsheet to do the step by step method for estimating the temperature of unprotected steel work exposed to the ASTM E119 Standard Fire. Assume a convective heat transfer coefficient of 25 W/m2K and an emissivity of 0.5. Assume the specific heat to remain constant at 600 J/kgK. Use a time step of 30 seconds and an ambient temperature of 20°C. Provide an Excel plot showing the curves of the fire and a steel member through a time of 60 minutes with F/V ratios of: a)25 m-1 b)100 m-1 c)200 m-1 d)300 m-1 Note your plot should contain 5 curves. One for the fire and one for each of the F/V values. Also on the spreadsheet, highlight in green, the cells identifying the temperature of the unprotected steel member with an F/V of 200m-1 at the following times: a)3 minutes b)10 minutes c)20 minutes d)50 minutes
- Design thickness of the wall to maintain steady heat flux ??Solve this with diagram: An engine cover is made from 1 cm thick stainless steel plate (k = 14 W/m K). Air on the inside of the engine cover is heated to 340°C with a heat transfer coefficient of 7 W/m2K. Outside of the engine coverthe ambient air has a temperature of 70°C. If oil was spilled on the outside of the engine cover (ambient side), it could ignite if the surface temperature were to exceed 200°C. In this configuration, would spilled oil ignite? Use calculations to justify your answer. If a 4 mm thermal coating (k = 1.1 W/m K) was applied tothe outside of the engine, what would the outside temperature of the engine cover be reduced to? Solve it with resistors methodSolve this with diagram: An engine cover is made from 1 cm thick stainless steel plate (k = 14 W/m K). Air on the inside of the engine cover is heated to 340°C with a heat transfer coefficient of 7 W/m2K. Outside of the engine coverthe ambient air has a temperature of 70°C. If oil was spilled on the outside of the engine cover (ambient side), it could ignite if the surface temperature were to exceed 200°C. In this configuration, would spilled oil ignite? Use calculations to justify your answer. If a 4 mm thermal coating (k = 1.1 W/m K) was applied tothe outside of the engine, what would the outside temperature of the engine cover be reduced to?