barcode scanner java download Figure 927 Secondary CHW loop for radiant panels in Software

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Figure 927 Secondary CHW loop for radiant panels
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Figure 928 Evaporative cooling (sprays)
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If the entering wet-bulb temperature twb1 is less than the entering drybulb temperature tdb1, then some of the water will be evaporated Because the process is essentially adiabatic, the heat required for evaporation must come from the airstream, thereby lowering its dry-bulb (sensible) temperature Then the leaving dry-bulb temperature tdb2 will be less than tdb1 The wet-bulb temperature will remain constant, twb2 twb1, and the process can be shown on the psychrometric chart as a constant wet-bulb process (Fig 929) If the system were 100 percent ef cient, then tdb2, would equal twb2 and point 2 would be on the saturation curve No evaporative cooler is 100 percent effective Effectiveness (eff) is de ned as the ratio of the change of the dry-bulb
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Figure 929 Psychrometric chart for evaporative cooling
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temperature through the cooler to the initial difference between wetand dry-bulb temperatures: Eff tdb1 tdb1 tdb2 twb1 100% (94)
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The enthalpy of the water has been added to that of the air, so the total heat of the airstream has actually increased Nevertheless there is a sensible cooling effect, which can be very satisfactory in a dry climate The resultant space humidity will be high compared to a mechanical refrigeration cycle A very useful application of evaporative cooling is in providing relief to workers in hot-process situations, where larger air ows at moderate temperatures are most effective Evaporative coolers come in three types: spray, slinger, and drip A spray- lled system, sometimes called an air washer, utilizes the atomization effect of the sprays to provide an air-water contact surface for evaporation Baf es are then provided to eliminate any free moisture from the airstream A recirculating pump, makeup water, and water treatment are needed At the recommended air velocity of 500 ft/min, a 6-ft-long spray cooler will have an effectiveness of about 95 percent A slinger is a rotating wheel, one edge of which is immersed in the water sump, so that as the wheel rotates, water is thrown into the air The air passes through pads of fabric or shredded wood which are wetted by the water spray to further increase contact between water and air The pads also act as free-moisture eliminators Effectiveness is on the order of 40 to 60 percent depending on the air velocity Drip-type coolers have pads which are wetted by water which is distributed by gravity from an overhead trough Excess water may be wasted or recirculated by a small pump This is the so-called swamp cooler which is very common in residences in dry climates Effectiveness ranges from 30 to 50 percent A bleed function is required for evaporative cooler basins just as for cooling towers, to avoid solids buildup on wetted surfaces Chemical bacterial control is also recommended
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991 Two-stage evaporative cooling
A two-stage evaporative cooling system (Fig 930) consists of a conventional cooler, as described above, preceded by a precooling section which gets its water supply from an evaporative water cooler As shown on the psychrometric chart (Fig 931), the precooling coil reduces both the wet- and dry-bulb temperatures of the air entering the second-stage evaporative cooler, thereby decreasing the nal dry-bulb temperature and the resulting space humidity While the system is more costly than single-stage evaporative cooling, it may be more costDownloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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