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inner The outside pipe diameter may be 2 in (5 cm); the inner, 11 4 in (32 cm) In some instances, the pipes are exposed to the atmosphere either with or without water drip In an evaporative condenser the refrigerant vapor is condensed as it passes through tubes over which water is sprayed; the water is then evaporated by air owing over the wet tubes In this way, cooling-water requirements are reduced to from 5 to 15 percent of the water requirements of a nonevaporative condenser with no water reuse The evaporative condenser combines in a single unit a refrigerant condenser and the atmospheric cooling tower or spray pond which is required if the cooling water is to be reused Air-cooled nned-tube condensers with forced ventilation are widely used on small units, and shell-and-coil or double-tube watercooled condensers on medium units Evaporators may have nned or plain surfaces Defrosting may be automatic or manual Flooded evaporators are operated practically full of liquid refrigerant, the level being controlled by a oat valve Wet-expansion evaporators are operated with a level approaching that for ooded operation; dry-expansion (once-through) units operate with an inde nite amount of liquid in the evaporator Steam-jet refrigeration systems are used where cooling to temperatures above 32 F (0 C) is desired Applications include industrial air conditioning and cooling of city gas to condense out tar and other objectionable impurities, of gas absorbers to increase ef ciency of absorption, of reaction units where heat removal and temperature control are important during chemical transformations, and of wort and mash in the brewing and other fermentation idustries particularly in the summer months
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Absorption refrigeration machines are essentially vapor-compression plants (Fig 1383) in which the mechanical compressor has been replaced by a thermally activated arrangement (Fig 1385) The basic elements are the absorber, pump, heat exchanger, throttle valve, and generator A typical absorption machine requires about 20 lb (9 kg) of steam for 1 ton (35 kW) of refrigeration effect at 45 F (7 C)
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Thermoelectric cooling utilizes the Peltier effect whereby a temperature differential will occur between two junctions of a closed loop of dissimilar metallic conductors when an electric current is imposed It is variously called Peltier effect cooling, thermoelectric refrigeration, and electronic cooling It is the inverse of the thermocouple operating principle whereby a temperature differential across the junctions of two dissimilar metals produces an electric current The capacity of a thermoelectric couple is small System capacity can be increased by increasing the number of elements used The temperature produced can be lowered by cascading the systems Capacities approaching 25 tons (879 kW) cooling effect have been achieved, and temperatures as low as 266 F ( 166 C) have been attained
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FIGURE 1385 Elemental absorption system circuit
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In direct expansion systems the evaporator is placed in the space which is to be cooled; in indirect systems a secondary uid (brine) is cooled by contact with the evaporator surface, and the cooled brine goes to the space which is to be refrigerated Brine systems require 40 to 60 percent more surface than do direct expansion; they have an equalizing effect due to the large heat capacity of cold brine, they are safer (particularly if the refrigerating effect must be carried considerable distance or widely distributed), and they permit closer temperature regulation than is possible with direct expansion If two temperatures are to be held, the lower may be by direct expansion, the higher by brine cooling Development of better controls and newer piping methods has made direct expansion more attractive than previously Brines used for industrial refrigeration are usually aqueous solutions of calcium chloride, ethylene glycol, propylene glycol, or undiluted methylene chloride Brine coolers may be of three types: shell-and-tube, shell-and-coil, and double pipe The shell-and-tube type most widely used is brine owing through the tubes which are surrounded by the evaporating refrigerant Tubes may be arranged for multipass operations Effective heat-transfer surface varies from 8 to 15 ft2 / ton (021 to 04 m2 / kW), varying with temperature and brine velocity A submerged coil in an open brine tank is used for ice making by the can process The double-pipe cooler is usually of 2-in (50-mm) inner or brine- ow pipe and 3-in (75-mm) outer pipe The commercial rating is 15 to 20 ft (5 to 6 m) length of coil per ton of refrigeration The shell-and-tube cooler is used with closed heads and is erected both vertically and horizontally; brine ows through the tubes and ammonia is in the shell It is
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