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Factors Affecting Melting Point

Wet bulb depr...

Question

Wet bulb depression, under saturated ambient air conditions:

Is always poitive

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Is always negative

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Is always zero

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May have a value depending upon the dew

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Solution

The correct option is C Is always zero
DBT - Dry bulb temperature
WBT - wet bulb temperature
WBT - wet bulb depression

WBD = DBT - WBT

$W B D \neq 0 for unsaturated air ∵ D B T > W B T$

WBD = 0 for saturated air $∵ D B T = W B T$

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P_{v} P_{w} - \frac{(P - P_{w}) (T_{d b} - T_{w b}) (1.8)}{2800 - 1.3 (1.8 T_{d b} + 32)}

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T $(^{^{\circ} C})$	30	34	38	42
P(kPa)	4.246	4.753	6.624	8.20

1. Relative humidity	2. Wet bulb depression
3. Specific volume	4. DPT

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