Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1994-01-14
1997-12-02
Ford, John K.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 26, 165 61, 165 63, 165 64, 165 481, 219400, 324760, F25B 2900
Patent
active
056925565
ABSTRACT:
Milli-Kelvin temperature control in an air chamber by use of coarse and fine temperature control systems, and through the use of structure for handling air flow within the chamber. The coarse control system provides enough heating or cooling power to hold the chamber temperature at a value near, but below, the desired operating temperature, thus leaving a small differential to be made up by the fine control loop. The coarse control has a fairly large thermal time constant (in the order of tens of seconds). The fine control loop has a very fast response time (in the order of fractional seconds). This fast response time is achieved by the use of a heater having minimal thermal mass, a fast response sensor, and a high precision controller. Air circulation within the chamber is forced by an in-line assembly of a number of high volume blowers, all having a common shaft, driven by a constant speed motor. The formation of laminar flow patterns, with their tendency to spontaneous shift in the patterns, is prevented by the use of a limited number of deflectors, i.e. small metal plates placed at nearly right angles to the air stream, fastened to the chamber's ceiling.
REFERENCES:
patent: 1873838 (1932-08-01), Gebhard
patent: 2583906 (1952-01-01), Van Guilder
patent: 2731807 (1956-01-01), Allyne
patent: 4572283 (1986-02-01), Vanderschaaf
patent: 4984628 (1991-01-01), Uchida et al.
patent: 5061448 (1991-10-01), Mahe et al.
patent: 5123477 (1992-06-01), Tyler
patent: 5211713 (1993-05-01), Suyama
"Ultra Stable Constant temperature Baths and Circulators" Hait Scientific Provo Utah (No date).
"Truly Precise temperature chambers" Sigma Systems Corp. San Diego, California (No date).
Ford John K.
Skolnik Robert M.
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