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- The presence of thermal reservoir of a Geothermal Power Plant, suppiements the generationn of power and energy What is then the thermal energy at the reservoir if the temperatures of the reservoir and a reference point are 315 Cand 295 C respectively with volumetric specific heat and the value at the reservoir are 78 K/KG and 155 cumeter. 241,800 KJ 352,500 KJ (c) 421,850 KJ D) 541, 820 KJ-A per fectly sealed room metors height 10 meters wide, 12 meter? long and 3 Is composed of 49 shudonts and I pro fessor- The piesore and temperature of I atm and o deg C. respechiuely. If a person occopics an averange room has an initial Volume of D-20 ecubic meter and gjuel off 678 kj per nour of heat, what woud be the temperatore of the room af ter 10 mins ! Usc moleculor mass of air M equal to 28.9 kg/mol, specific heat of cir af constant volume Cv cqual to 0.718b HT/kq-k Cand gav constant R eaual to 0.117 k5/kg-uQ1. A 50 meter long cast iron pipe with outer diameter of 10 cm passes in an open space of 288 K temperature. The outer surface of the pipe temperature is 423 K and the combined heat transfer coefficient on the outer surface of the pipe is 25 W/m? K. Considering and stating the necessary assumptions determine, (a) The rate of heat loss from the pipe (b) The energy lost per year if the cost of the fuel is 0.52 $/therm ( 1 therm = 105,500 kJ) (c) The thickness of the insulation if 98% of the energy loss is planned to be saved. Consider the conduction coefficient of the insulation is 0.035 W/mK. Tair = 288 K 423 K Steam 50 m Fiberglass insulation Figure Q1.
- Inner diameter 30 cm, outer diameter 40 cm and heat conduction coefficient 20 W / m ∙ a cylindrical pipe with oC Take it. 25 W / m3 uniformly on the pipe wall There is a constant rate of heat generation. Tube inner surface 75 oC and outer surface temperature is 95oC. a) You can get a general correlation all over the world in the pipe (Continuous regime). b) Temperature calculation address from the midpoint of the pipe wall.GChoose the right answer 1. The temperature profile for steady hest conduction through a plane wall of constant thermal conductivity is a. logarithmic b. parabolic 2. A brick wall (k-0.75 W/mK ) transmits $02 of heat loss through another wall (k-0.25 W/mK, x-100 mm). If the temperature difference across both walls is the same, the thickness of the brick wall would be a.150 mm c. linear 6T b. 240 mm c. 300 mm d. 375 mm 3. The maximum temperature at the center of the solid sphere of radius R having heat generation q (W/m') is given by g'R +9R b. T, + 4k T+9R 6k d. T+9R 8k a. 2k C. 4. The internal thermal resistance of a solid can be ignored if the Biot number is less than a. 1 b. 0.5 c. 0.1 d. Fourier number 5. The ratio of heat transfer of a fin to the heat transfer without fin is referred to as a. fin resistance b. fin efficieney efin effectiveness d. fin conductance.The fin showni n figure has a base maindained at 00 °€ and is exposed to t-2Conve ction enviroment indicated ealculate the stedy state temberature of the nedes heat lossif K e quesion by using Matrix shown in igure and the K =1 w/m.c solve the 2 20c 2. h= 4ow /C.m² 1cm 千. 1 Cm 2CM 2CM
- The heat transfer across a 5" wall of firebrick is 500 W/m2. If the surface temperature thermalconductivity of brick is 0.7 Btu/hr-ft-°F, find he on cold side is 30°C and temperature on hot side. O 65.37 deg C 87.25 deg C 73.45 deg C 82.41 deg CQ2) The outer surfaces of the plane composite wall (A, B and C) are exposed to a fluid at 25'C and a convection heat transfer coefficient of 1000 W/m² "C. The thickness of walls A, B and C are 30, 60 and 20 mm, respectively. The thermal conductivity of walls material A, B and C are 25, 15 and 50 W/m "C, respectively. The middle wall (B) has a uniform heat generation, while there is no generation in walls A and C. The outer surfaces temperature of A and C are 132°C and 158°C, respectively. At steady state-one dimensional heat transfer conditions calculate: (1) The temperature in wall B at a distance of 10 mm from interphase of walls B and C. (2) The temperature in wall B at a distance of 5 mm from interphase of walls B and A. (3) The temperature at the middle of wall B.Please solve both parts with handwriting please need with correct answer need awesome answer solve both handwriting i requested to u. Part6. An exposed 8 cm external diameter, 20 m long hot-water pipe at 80°C is losing heat to the surrounding (outdoor) air by natural convection. The average outdoor temperature is 5°C. The heat transfer coefficient is 25 W/m2°C. What is the heat loss by natural convection, in kW? A. 9.4 W B. 10.0 W C. 10.4 W D. 11.4 W Part7. A spherical ball with a diameter of 10 cm has an outer surface that is maintained at a temperature of 200°C. It is suspended in the middle of a room that has an average temperature of 20°C. If the surface emissivity is 0.8, determine the rate of radiative heat transfer from the ball to the room in W. (Choose the nearest value) A. 2.3 W B. 4.5 W C. 19.4 W D. 60.8 W
- on a 10 mm thick plate 5.104 W/m³ heat generation takes place. Heat transfer coefficient of the plate50 W/m.°C One surface of the plate is insulated and the temperature of the other surface is T₂ T₂ plate at the temperaturesurface at 20 C and heat convection coefficient of 20 W/m. It is in contact with the environment at C. One of the heat transfer Assuming that the temperature T₂ distribution of the plate is continuous, temperature and maximum find the temperature Yalıtım T₂=? L=10 mm T-20 °C h=20 W/m°C: A spherical container ( k= 30 W/moC ) with inner radius r1 = 2 m and outer radius ro=2.1 m is is filled with ice water T= 0 oC subjected to the convection on the outer surface T∞2 = 25 oC , h∞2= 18 W/m2 oC .For steady one-dimensional heat transfercalculate a) The mathematical formulation b) the variation of temperature, and c) therate of heat transfer are to be determined foConsider steady-state conditions for one-dimensional conduction in a plane wall having a thermal conductivity k = 40 W/m-K and a thickness L = 0.4 m, with no internal heat generation. -T2 L Determine the heat flux, in kW/m2, and the unknown quantity for each case. Case T1(°C) T2(°C) dT/dx(K/m) 9% (kW/m²) 1 50 -20 i i -30 -10 i i 3 70 i 160 i 4 i 40 -80 i i 30 200 i LO