G - Physics – 06 – G
Patent
G - Physics
06
G
354/23
G06G 7/48 (2006.01) F23N 5/00 (2006.01)
Patent
CA 1159560
-1- A B S T R A C T "APPARATUS FOR MEASURING THE EFFICIENCY OF COMBUSTION APPLIANCES" This disclosure relates to apparatus of the kind suitable for taking spot measurements of the heat loss or stack loss and/or efficiency (?) in flue gases (stack loss) and comprises respective sensors (5, 3) for producing output signals which vary with the temp- erature and the concentration of a constituent gas e.g. O2 of the flue gases and microprocessor-based computation means (10) arranged to derive measurement values of (and numerically equal to) the measured temperature and constituent gas concentration, from the two sensors and to apply these measurement values in the computation of a predetermined formula relating the stack loss or efficiency to the measured quantities. In accordance with the invention, the apparatus is arranged to automatically calibrate the or each sensor from a test measurement prior to deriving the measurement values. This may be achieved in the case of a sensor having a non-linear response, by performing a calculation of a formula defining the non-linear response of the sensor using a coefficient derived from the test measurement. The sensor is thus automatically calibrated and "linearised" from a single test measurement. The predetermined stack loss or efficiency formula may be modified for different types of fuel, and temperature and O2 (or CO2) values used in the calculation as well as -2- the result of the calculation may be presented on a visual display (24). The apparatus requires a minimum of operator expertise and reduces the possibility of human error associated with known stack loss measurement apparatus of the kind in which the operator is required to refer to charts to determine the stack loss from separate temperature and oxygen concentration readings.
365194
Buckenham Howard A.
Feldman Hugh V.
Gotley Paul
Young Richard
Neotronics Limited
R. William Wray & Associates
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