Load Calculation of Psychrometry MCQ Quiz in বাংলা - Objective Question with Answer for Load Calculation of Psychrometry - বিনামূল্যে ডাউনলোড করুন [PDF]
Last updated on Mar 13, 2025
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Load Calculation of Psychrometry Question 1:
In a theatre, heat is generated at the rate of 150 kJ/s due to the occupants, music and display system and other lighting. The rate of generation of excess moisture is 45 kg/hr. The theatre is provided with an air conditioner that is supplying conditioning at 600 m3/min. Calculate the Sensible heat factor for the theatre.
Answer (Detailed Solution Below) 0.81 - 0.83
Load Calculation of Psychrometry Question 1 Detailed Solution
Concept:
Sensible heat factor is defined as the ratio of sensible heat to total heat. Sensible heat is defined as the heat that causes a change in temperature and latent heat is the one that causes a change in phase and cannot be sensed. Total heat is the sum of sensible heat and latent heat.
Calculation:
Sensible heat = 150 kJ/s
Latent heat =
Total heat = SH + LH = 181.25 kJ/s
SHF = 150/181.25 = 0.83
Load Calculation of Psychrometry Question 2:
Air entering the cooling coil 20% RH and 80% recirculating air. The outside air has enthalpy of 85 kJ/kg of da, and the room air has hi = 50.8 kJ/kg of da and the mixture has h1 = 57.64 kJ/kg of da. The air enthalpy corresponding to cooling coil temperature hs = 37.0 kJ/kg of da. The ratio of total cooling load to fresh air load is
Answer (Detailed Solution Below) 3.0 - 3.1
Load Calculation of Psychrometry Question 2 Detailed Solution
Total cooling load = h1 – hs = 57.64 – 37 = 20.64 kJ/kg of da
Fresh air load = 0.2 (85 – 50.8) = 6.84 kJ/kg of da
Load Calculation of Psychrometry Question 3:
40
Answer (Detailed Solution Below)
6.85 gm/kg of air
Load Calculation of Psychrometry Question 3 Detailed Solution
Tonne of refrigeration
Sensible heat factor for cooling and dehumidification
∴ w2 = 6.85 gm/kg of air