Solve for the latent heat of water at Tw = 28C (and. λw = 2435 kJ/kg)
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Solve for the latent heat of water at Tw = 28C
(and. λw = 2435 kJ/kg)
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- A solid hemisphere of radius 5 cm to be cooled in air (at 20 o C, h=10 W/m 2 .K) from 200 oC to center of 150 oC, assume following sphere properties ρ=8500kg/m3, k=20W/m.K , C=400 J/kg.Ka. List assumptions and justify selected method of solution b. How long does it take to cool the hemisphere? c. What is the temperature of the surface at end of cooling?Q6. Explain how heat transfer between the boundaries.350 pipes are fixed as square in a pipe bundle used for condenser. PipeThe outer diameters are 8 mm and the steam at 0.2 bar is desired to be condensed on the pipes. pipe outer The surface temperature is kept constant at 30 °C. If the length of the pipes is 1.5 m, the heat transferred in the systemCalculate the amount of energy and the amount of condensed steam
- Conduction 1. A thermodynamic analysis of a proposed Brayton cycle gas turbine yields P= 5 MW of net power production. The compressor, at an average temperature of T. = 400°C, is driven by the turbine at an average temperature of T₁ = 1000°C by way of an L = 1m-long, d= 70mm - diameter shaft of thermal conductivity k = 40 W/m K. Compressor min T Combustion chamber Shaft L Turbine Th out (a) Compare the steady-state conduction rate through the shaft connecting the hot turbine to the warm compressor to the net power predicted by the thermodynamics- based analysis. (b) A research team proposes to scale down the gas turbine of part (a), keeping all dimensions in the same proportions. The team assumes that the same hot and cold temperatures exist as in part (a) and that the net power output of the gas turbine is proportional to the overall volume of the device. Plot the ratio of the conduction through the shaft to the net power output of the turbine over the range 0.005 m s Ls 1 m. Is a…Awnser2. The initial temperature of the hot coffee cup is T(0) = 175°F. The cup is placed in a room temperature of T... = 70°F. The temperature T(t) of the coffee at time t can be approximated by Newton's law of cooling. ·+hT(t)=hT∞, where h is the convective heat transfer coefficient. dT dt (a) Find the transient solution, Ttran(t). (b) Find the steady-state solution. Tss(t). (c) Determine the total solution T(t). (d) Would increasing the value of h increase or decrease the time when the temperature of coffee reaches the room temp? (e) Would a lower or higher value of h be best for a cup of coffee?
- These are the formula for the topic Answer the problem 1 complete solution please thank youuThe critical temperature of gas TOS is -46 deg Celsius. If the value of its Van der Waals constant b is 2.1 x 10 -5 m3/n, find the value of its VDW constant a in Pa-m6/n2How much air is used per kg of coal burnt in a boiler having a chimney of 31.1 m height to create a draught of 19 mm of the water column when the temperature of the flue gases in the chimney is 361 o C and the temperature of the boiler house is 28.4 o C. Also find the equivalent gas head of the chimney.
- find the work done by 0.15kg of air in a isobraic compression from t1=258k to t2=367 at 203kpaA cylindrical vessel (D=98,4 cm) is filled with water (ρ=1000 kg/m3, c=4.187 kJ/kg.K) to a depth of 113,64 cm. The initial temperature of the water is 15°C. Determine the time [min] required to increase the water temperature to 50°C when it is immersed into tank, filled with oil at 105°C. (NOTE: The overall heat transfer coefficient between the oil and the water is 284 W/m2.K. The surface area is 4.2 m2.)(heat transfer ) thanks The velocity of the fluid flowing in parallel over a 500mmx500mm flat heater surface is U= 19 m/s and the inlet velocity temperature is T_∞15 C. The surface temperature of this plate is T_s140 C, the friction force is F_D=0.4 N and the surface area of the plate is A=0.32 m2. According to this;(F_D= 0.4N A=32 m2)a) Surface shear stressb) Find the coefficient of frictionc) Heat transfer coefficientd) What is the amount of heat transfer (electric power) that must be given to maintain a constant surface temperature?
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