Water cooler temperate

This family possesses several species very tolerant to pollution. Many species are adapted to very wet sites, typically on the edge of bodies of water, and so are suited for phytoremediation in such environments. In the temperate and cooler zones of Europe, Carex hirta can be recommended Cyperus alternifolius is an alternative for more southerly parts of the continent, and similarly, C. papyrus for the Mediterranean and subtropical zones. All these species can be vegetatively propagated by division of the mother plant. 

Although much research still needs to be conducted to define the thickness of caps, which depends on a variety of environmental factors, it is normally from to 2 m thick. Langley and El Saadi (1991) suggested that a — m depth of clean soil is an adequate barrier for residential developments, as this is unlikely to be penetrated by normal gardening activities. In Australia s dry climate, plant root exploration depth, particularly under backyard-gardening activities, is often determined by the depth of domestic watering, about 30 cm (Calder, 1993, although in temperate cooler climates, this is likely to be deeper. 

Even plant cooling water can present a seasonal problem. Wnter temperatures are often low enough to make hydrate formation possible. It is then necessary to limit the temperature of the water used on the chlorine cooler. This is usually done by arranging for series use of the water in more than one service or by tempering it with a warmer stream. Often, the latter approach uses some of the water issuing from the exchanger itself, recycled to the feed point under temperature control. Cocurrent flow of gas and coolant also can reduce the probability of hydrate formation. 

When obtaining a sample of hot oil, one is often interested in the composition of the front end. If the sample is taken close to its process temperature, the lightest components will simply flash off and not be accounted for. A well-designed sample cooler will solve this problem. For resid streams, tempered cooling water will probably be needed to prevent plugging the cooling coil. 

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