District Heating
Sir,—District heating generally uses high-temperature water—between 200 and 500 degrees Fahrenheit—as the medium for conveying heat. At 500 degrees each cubic foot of water carries 24,000 B.Thu.U. per cubic foot, so that relatively small pipes carry a great quantity of heat. “Citogen” is probably aware that coal tar fuel was used in about 4000 industrial plants during the last war as a substitute for petroleum fuel oil. The production of gas from low-sulphur coal leaves byproducts of coke and tar; coke
makes a smokeless fuel, and tar, burnt properly, yields very little smoke. The process is almost a closed cycle. The "Science Journal” recently pointed out that the open coal fire constitutes the best example of the worst use of coal, as the chemical process yielded no useable by-pro-ducts.—Yours, etc., PATRICK NEARY. July 8, 1968.
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Bibliographic details
Press, Volume CVIII, Issue 31726, 9 July 1968, Page 12
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137District Heating Press, Volume CVIII, Issue 31726, 9 July 1968, Page 12
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