By W.P. Jones MSc CEng FInstE FCIBSE MASHRAE

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Extra info for Air Conditioning Engineering, Edition: 5th ed

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5 Humidification 49 Airflow ,v 'i ha hChb~/C gc gb ga , g~ gc' tctb G (a) Negligible change / in enthalpy / / gc gb 9a tctb G (b) Fig. 6 (a) The change of state when air flows through a spray chamber having spray water at a controlled temperature. (b) Adiabatic saturation when the spray water is entirely recirculated and neither cooled nor heated. 6(a) shows that hb is greater than h a. This implies that there is a heat input to the spray water being circulated through the spray chamber. Although it is not recommended 50 The psychrometry o f air conditioning processes it could be easily accomplished by means of, say, a calorifier in the return pipe from the washer tank.

Feed-water is supplied to the chamber to make good that evaporated. 8 shows such a situation. , temperature hw enthalpy Fig. 8 Airflow through a perfectly insulated humidification chamber. A heat balance may be established: Ca(t1 - t2) + Csgl(tl - t2) = (g2 - gl)[(t2 - tw) + hfg] This equation expresses the physical changes that have taken place: (i) g 2 - gl kg of feed-water are sensibly heated from a temperature of tw to a temperature t2. (ii) g2 - g l kg of water are evaporated from the wetted surface within the chamber, at a temperature t 2.

3 Psychrometry for sensible heating and cooling. 8439 m 3 per kg of dry air. 31 kJ per kg of dry air. 2 kJ/kg K is the specific heat capacity of water. 3 by 5 degrees. What is the flow rate of chilled water necessary to effect this cooling if flow and return temperatures of 10~ and 15~ are satisfactory? Answer The initial enthalpy and humid volume are the same as in the first example. 171 g per kg of dry air. 77 kJ per kg of dry air. 2 = 0 . 4 3 3 k g s -~ It is to be noted that, for sensible cooling, the selection of cooler coils and the choice of chilled water flow temperature require some care.

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