Transient Cooling For either a flat plate or flow through a duct, how was the convective heat transfer determined? please explain?
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Transient Cooling
For either a flat plate or flow through a duct, how was the convective heat transfer determined? please explain?
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- How convective heat transfer is effected and on what factors it depends?Use the relation for ideal work to calculate the minimum power needed to freeze a mass flow of 1 Tonne (= 1000 kg) of ice at 0 ⁰C per hour, starting from water at 21.1 ⁰C. Surroundings at 21.1 ⁰C. [Answer: - 8.8 kW.]An ammonia compressor has a volumetric effienciy og 85%, operating condensing & evaporating temperatures of 40 C & 10 C respectively for a cooling capacity of 10 tons with compression index of 1.2, mean piston speed of 2m/s, 5% clearance & bore to stroke ratio of 0.7. Determine the ff: 4. work of compressor in kj/kg 5. power of compressor in kj/kg 6. cooling coefficient of performance
- A company owns a refrigeration system whoserefrigeration capacity is 200 tons (1 ton of refrigeration =211 kJ/min), and you are to design a forced-air cooling systemfor fruits whose diameters do not exceed 7 cm under the followingconditions:The fruits are to be cooled from 28°C to an average temperatureof 8°C. The air temperature is to remain above -2°Cand below 10°C at all times, and the velocity of air approachingthe fruits must remain under 2 m/s. The cooling section canbe as wide as 3.5 m and as high as 2 m.Assuming reasonable values for the average fruit density,specific heat, and porosity (the fraction of air volume in a box), recommend reasonable values for the quantities related to the thermal aspects of the forced-air cooling, including (a) how long the fruits need to remain in the cooling section, (b) the length of the cooling section, (c) the air velocity approaching the cooling section, (d) the product cooling capacity of the system, in kg fruit/h, (e) the volume flow rate…An exhaust valve has a valve curtain area of 3 x 10-3 m2 and valve discharge coefficient of 0.7.The cylinder pressure is 550 kPa while its temperature is 990K.If the exhaust system pressure is 103kPa withspecific heat ratio of 1.35 with gas constant of 287 J/kg-K,determine the initial mass flow rate in the exhaustvalve.1. Moist air enters a refrigeration coil at 89 F dry-bulb temperature and 65 F thermodynamic wet bulb temperature at a rate of 14oo cu ft per min. The surface temperature of the coil is 55 F . If 3.5 tons of refrigeration are available, find the dry bulb and wet bulb temperatures of the air leaving the coil. Assume sea level pressure.
- Solve for the latent heat of water at Tw = 28C(and. λw = 2435 kJ/kg)A stationary temperature probe inserted into a duct where air is flowing at 190 m/s reads 85°C. What is the actual temperature of the air?Determine the power required for a forced draught and induced draught fan in a boiler having coalconsumption of 25 kg/min and air/fuel ratio of 19 by mass. The ambient air temperature and hotgas temperature at exit are 30C and 140C respectively. Draught required is equivalent to 32.2 mmof water and mechanical efficiency of motor/fan is merely 70%
- Explain how to Entropy Generation Associated with a Heat Transfer ProcessEXAMPLE 5: 1.5 m 3 s -1 of moist air at a state of 28C dry-bulb, 20.6C wet-bulb (sling) and 101.325 kPa flows across a cooler coil and leaves the coil at 12.5C dry-bulb and 8.336 g per kg of dry air. Determine (a) the apparatus dew point, (b) the contact factor and (c) the cooling load.Air with dby bulb temperature of 25C PSAT = 3.169kpa and wet bulb temperature of 15C PSAT=1.7051 kpa flows in round duct of diameter 800m with velocity of 7m/S Determine Mass flow rate (answer. 249kg/min) Mass flow rate of dry air (answer 247 kg/min)