Question
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l. Before using the Psychrometric chart, why should one check the atmospheric pressure that the chart is prepared for? 2. Explain the meaning of the coil by-pass factor (BF). Discuss the difference(s) in the design of a coil that has a large BF and another coil that has a smaller BF 3. Air enters a cooling coil at the rate of 2.4 m /s at 27 C db and 20 C wb. The air leaves the coil at 13 C db and 12 C wb. Assume sea-level, determine (a) the coil SHF and the coil surface temperature (apparatus dew point), and (b) the total and sensible heat transfer rates from the air. Provide a schematic of the system and a sketch of the process(es) on the Psychrometric chart 4. 1.92 m s of air is flowing over a heating coil placed in a duct The air entering the coil is at 24 C db and 18 C wb and it is to be heated to 50 C. Compute the heating coil capacity. Provide a schematic of the system and a sketch of the process(es) on the Psychrometric chart 5. 1 m /s of air at an initial state of 16 C db and 30% relative humidity is to be heated and humidified to a final state of 43 C db and 30 o relative humidity The whole operation is carried out at sea-level. The air will first be heated followed by adiabatic humidification using saturated steam at 34.5 kPa Determine a) the required capacity of the heating coil, and (b) the required amount of steam. Provide a schematic of the system and a sketch of the process(es) on the Psychrometric char
Explanation / Answer
1. ) psychometric charts are different for differenet atmospheric pressure .. so in order to know which chart to follow one should know what is the atmospheric pressure
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2 . by pass factor just denote how much heat is transfered compared to maximum heat transferable.
ie bypas factor is (T0- Tadp )/(Ti -Tadp)
Ti is inlet temp . To is outlet temp , Tadp is due point temp
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