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Railways NTPC (Technical Ability) Refrigeration and Air-Conditioning Question Bank Refrigeration and Air-Conditioning

  • question_answer
    A cooling coil with a by-pass factor of 0.1 and apparatus dew point (adp) of \[12{}^\circ C\] comes in contact with air having a dry-bulb temperature of \[38{}^\circ C\] and dew point of \[9{}^\circ C.\] Over the cooling coil, the air would undergo:

    A) Sensible cooling

    B) Cooling and humidification

    C) Cooling and dehumidification

    D) Adiabatic saturation

    Correct Answer: C

    Solution :

    \[BPF\,\,=\,\,0.1,\,\] \[ADP\,\,=\,\,12{}^\circ C,\] \[DBT\,\,=\,\,38{}^\circ C,\]\[DPT\,\,=\,\,90{}^\circ C,\]  BPF for cooling coil \[=\frac{{{t}_{d\,2}}-{{t}_{d\,3}}}{{{t}_{d\,1}}-{{t}_{d\,3}}}\]          \[1=\frac{{{t}_{d\,2}}-12}{38-12}\]                         \[{{t}_{d\,2}}=2.6+12=14.6{}^\circ C>{{t}_{d\,1}}\] Dehumidification rakes place.


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