SU1719928A1 - Method and device for determining thermal inertia index of frequency thermal converters - Google Patents

Abstract

The invention relates to heat engineering measurements and allows for improved measurement accuracy. To determine the index of thermal inertia, the number of output pulses at the stage of regular thermal conditions in four subsequent equal time intervals D t is counted, and the value of the indicator of thermal inertia is determined by the expression given in the claims. The signal from the output of the thermal converter enters through the pulse shaper 1 and logic elements 8, 9, 10 and 11 to the inputs of logarithmic reversible counters 13, 14. The clock generator 2. Asynchronous RS-triggers 4,5,6,7, pulse distributor 3 provide for —thinking of time intervals At shifted by time interval p. The final generation of the measurement result is carried out using the subtracting unit 15, the trigger 12, the time — the code converter 16 and the division unit 17. 2 seconds. n. f-ly, 3 ill. Yo

Description

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Claims (2)

Claim 1. The method of determining the thermal inertia index of frequency thermal converters, which consists in counting the number of output pulses at the stage of regular thermal regime in four subsequent equal time intervals of duration At, characterized in that, in order to improve accuracy, the formation of the second, third and fourth time intervals is delayed with respect to the beginning of the first, second and third time intervals per time interval φ = (0.550.45) Δ ΐ, respectively, and the value of the thermal inertia index is a thermal conversion The factor τ is calculated by the formula. where is N1. Ν ₂ , N3, N4 - the number of pulses counted in the first, second, third and fourth time intervals, respectively. 2. A device for determining the thermal inertia index of frequency thermal converters, comprising a pulse shaper, the output of which is connected to the first inputs of the four logical elements And, and the input to the input of the clock pulse, the output of which and the control input are connected to the input and seventh output of the pulse distributor, respectively, two logarithmic reversible counters, the outputs of which are connected to the inputs of the subtracting unit, the addition inputs are connected to the outputs of the first and second logical elements And, and The subtraction methods are connected to the outputs of the third and fourth logical elements AND, the division unit, the first input of which is connected to the output of the time-code converter, the second input is connected to the output of the subtracting unit, and the output is connected to the digital display unit, characterized in that. that, in order to improve accuracy, five asynchronous RS-triggers are introduced into it, the first inputs of which are connected to the first, second, third, fourth and fifth outputs of the pulse distributor, respectively, the second inputs of the first, second, third and fourth asynchronous RS-triggers third, fourth, fifth and sixth outputs of the pulse distributor, respectively, and the outputs are connected to the second inputs of the first, second, third and fourth logical elements AND, while the second input of the fifth asynchronous RS-trigger is connected to the output of the pulse distributor, and the output is connected to the input of the time-code converter.