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Technical System Catalogue Climate Control

Air/water heat exchanger Project planning Calculate your required cooling output: e. g. Performance diagram Air/water heat exchanger 1000 W 50 Hz Water resistance performance diagram SK 3373.100, .110, .140, .500, .510, .540 SK 3373.100, .110, .140, .500, .510, .540 600 V = 400 l/h V = 200 l/h 3200 500 2800 2400 400 2000 . QK 45°C ΔP 300 1600 1200 35°C 200 800 25°C 100 400 0 5 10 15 20 25 30 35 100 200 300 400 500 Ti . V Tw . TW = Water inlet temperature (°C) V = Volumetric flow (l/h). QK = Useful cooling output (W) ΔP = Water resistance (mbar) Ti = Enclosure internal temperature (°C) Notes on water quality Material of the water-carrying parts For safe operation of the equipment, it is essential to observe Hydrological data CuAl V4A1) the VGB guidelines on cooling water (VGB-R 455 P). pH value 7 – 8.5 6 – 9 The cooling water should have a low level of hardness, par- Calcium hardness > 3 < 8° dH 1 – 12° dH ticularly calcium hardness. In particular, for recooling within Free carbonic acid 8 – 15 mg/dm3 1 – 100 mg/dm3 the plant, the calcium hardness should not be too high. On Accompanying carbonic acid 8 – 15 mg/dm3 Zero the other hand, the water should not be so soft that it attacks Aggressive carbonic acid 0 mg/dm3 0 – 400 mg/dm3 the materials. When recooling the cooling water, the salt con- Sulphides Zero Zero tent should not be allowed to increase excessively due to the evaporation of large quantities of water, since electrical con- Oxygen 3 3 ductivity increases as the concentration of dissolved sub- Chloride ions 3 3 stances rises, and the water thereby becomes more corro- Sulphate ions 3 3 sive. For this reason, not only is it always necessary to add a Nitrates and nitrites 3 3 corresponding quantity of fresh water, but also to remove COD 3 3 part of the enriched water. Ammonia 3 3 Water with high gypsum content is unsuitable for cooling pur- Iron 3 Free poses because it has a tendency to form boiler scale that is Manganese 3 Free particularly difficult to remove. Furthermore, cooling water Conductivity should be free from iron and manganese, because other- Evaporation residue 3 3 wise deposits may occur which settle in the pipes and block Potassium permanganate 3 3 them. At best, organic substances should only be present consumption in small quantities, because otherwise sludge deposits and 3 microbiological contamination may occur. > 3 < 15 mg/dm3 partial flow purification Suspended matter recommended > 15 mg/dm3 continuous purification recommended 1) The complete absence of corrosion under experimental conditions suggests that solutions with a significantly higher salt content and greater corrosion potential (such as seawater) may still be tolerated. 3 - 43 Technical System Catalogue/Climate control


Technical System Catalogue Climate Control
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