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By W.P. Jones MSc CEng FInstE FCIBSE MASHRAE

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Thus t' will be unchanged. What will change, of course, is the time taken for the droplet to attain the equilibrium state. The evaporation rate is increased for an increase in air velocity and so the water more rapidly assumes the wet-bulb temperature of the surrounding air. 5 m s-1 is sufficient to give a stable wet-bulb reading. 12) and so (gss- g) = Ms Ma (Pss-Ps) Pa it being assumed that Pa, the partial pressure of the non-condensable dry air surrounding the droplet, is not much changed by variations in Ps, for a given barometric pressure.

1. 75~ dry-bulb. The conclusion to be drawn is that the method used to obtain answer (b) is accurate enough for most practical purposes. 3 Sensible heating and cooling Sensible heat transfer occurs when moist air flows across a heater battery or over the coils of a sensible cooler. In the heater, the temperature of the medium used to provide the heat is not critical. The sole requirement for heat transfer is that the temperature shall exceed the final air temperature. In sensible cooling there is a further restriction: the lowest water temperature must not be so low that moisture starts to condense on the cooler coils.

Under these conditions it may be assumed that the change of state follows a line of constant wet-bulb temperature (since the Lewis number for air-water vapour mixtures is unity), the system having been given sufficient time to settle down to steady-state operation. There must be a change of enthalpy during the process because feed water is being supplied at the wet-bulb temperature (virtually) and this will not, as a general rule, equal the datum temperature for the enthalpy of water, 0~ Strictly speaking then, it is incorrect to speak of the process as being an adiabatic one.

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