New PDF release: Air Conditioning Engineering
By W.P. Jones MSc CEng FInstE FCIBSE MASHRAE
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Remedy any construction air caliber challenge a whole reference for the layout of air filtration structures and HVAC structures utilized in houses, faculties, hospitals, laboratories, or animal amenities, this e-book deals entire descriptions of every of the most important applied sciences presently used for air disinfection.
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At this juncture it is worth observing that increasing the air velocity does not (contrary to what might be expected) lower the equilibrium temperature t'. As more mass of air flows over the droplet each second there is an increase in the transfer of sensible heat to the water, but this is offset by an increase in the latent heat loss from the droplet. 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.
Ii) g2 - g l kg of water are evaporated from the wetted surface within the chamber, at a temperature t 2. The latent heat required for this is hfg kJ kg -1 at temperature t2. (iii) 1 kg of dry air is cooled from a temperature tl to a temperature t2. (iv) gl kg of steam are cooled from t 1 to t 2. 18 Temperature of adiabatic saturation 29 In due course, if the chamber is infinitely long, the moist air will become saturated and will have a moisture content gss and a temperature tss. 30). 9. It can also be seen that if the air is saturated by passing it through an adiabatic saturation chamber, its wet-bulb temperature will fall, if as illustrated, the value of the Lewis number is greater than one.
336 g per kg of dry air. 4 Dehumidification 47 Determine (a) the apparatus dew point, (b) the contact factor and (c) the cooling load. 5 shows the psychrometric changes involved and the values immediately known from the data in the question. 61 kJ kg -1. 8693 m 3 kg -1. 336 g/kg tc Fig. 5. (a) Mark state points A and B on a psychrometric chart. Join them by a straight line and extend the line to cut the saturation curve. 25~ It is not easy to decide this value with any exactness unless a large psychrometric chart is used.
Air Conditioning Engineering by W.P. Jones MSc CEng FInstE FCIBSE MASHRAE