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<br />Ou,-,)';l; <br /> <br />SUMMARY <br /> <br />During the winter time when evaporation from the surface <br /> <br />is responsible for only a small part of the heat transfer, the <br /> <br />water temperature at the end of a moving stream of water may be <br /> <br />estimated from the equation <br /> <br />- fbl <br />e 0 ( e . () ) e MS <br />L = a f 0 - a <br /> <br />where <br /> <br />final wRtAr temperature (OF) <br /> <br />[eL > 320>>'] <br /> <br />~ <br />Q = <br />L <br />e <br />a <br /> <br />" ambient air temperature (oy) <br /> <br />e " ini \1al water tsm~erature (Oy) <br />0 <br />b " width of water surface (it. ) <br />L " length of stream (ft.) <br />M " mass velocity of water (lb./hr. ) <br /> <br />S =epecific heat of water" 1.00 (B.t.u./lb.xOl) <br />f = surface film conductance (B.t.u./hr.xft.2xol.) <br /> <br />J <br /> <br />:=< 1.75 .,I-O.25V <br /> <br />v = wind velocity parallel to earth (ft./sec.) <br />LEor etili air anUM V " 1.0 n./sec:] <br /> <br />5 <br />