SU1348655A1 - Method of determining the working volume of chamber of differential adiabatic scanning two-chamber calorimeter - Google Patents

Abstract

The invention relates to calorimetry, in which the number of reference and test liquids is normalized by the capacity of the chambers. The purpose of the invention is to increase the accuracy and simplify the calibration procedure of the calorimeter. Chambers 1 and 4 are filled through inlets 2 and 5 with medium with known heat capacity and density. Heaters 3 and 6 supply heating current and compensation current. The controller 10 maintains the temperature of the shell 11 equal to the temperature of chamber 4. Using the readings of voltmeters 15 and 16, the power in heater 3 is determined. Cool chambers 1 and 4 and fill chamber 1 with another medium with known heat capacity and density. Chambers 1 and 4 are heated in the first heating mode. I act on the resistor 17, regulate the current in the heater so that the temperature difference 1 and 4 is equal to zero. The control is carried out according to the registrar 9. The size of the chamber 1 is calculated by the formula. The working volume of chamber 4 was determined similarly by using voltmeters 19 and 20 and resistors 21 and 18. 1 sludge. U 5 years (L oo 00 05 cf SP

Description

113486552

The invention relates to a differential heat capacity and density. The secondary adiabatic scanning coal loops heat the chambers 1 and 4 in the mode

first warm up. When the temperature of chambers 1 and 4 reaches the same 10

rimetry, in which the amount of the reference and test liquid is normalized by the capacity of the chambers.

The aim of the invention is to increase the accuracy and simplify the calibration procedure of the calorimeter.

The drawing shows a diagram of the connection of a calorimeter with instruments for implementing the method.

The calorimeter includes: first chamber I with tubular inputs 2 and heater 3; second chamber 4 with pipes; 5 The working chamber of the second chamber 4 with wet inputs 5 and heater 6 can be determined similarly, with sensor 7 of the temperature difference connected to controller 8, whose input is connected to recorder 9, shell temperature controller 10 is connected to temperature difference sensor 12 and heater 13. Measuring instruments include a resistor 14 with a voltmeter 15 and a voltmeter 16 for measuring the power in the heater 3 and a resistor 17 for regulators 3 and the heater current, the resistor 18, voltmeters 19 and 20 for power measurement in

As with the first heating, I act on the resistor 17 to regulate the current in the Z. heater, so that the temperature difference between the chambers 1 and 4 is equal to zero. The monitoring is carried out according to the recorder 9. A second reading of voltmeters 15 and 16 is taken in the initial temperature range. The working volume of the chamber is calculated from a form using voltmeters 19 and 20 and resistors 21 and 18.

the invention

The method for determining the working volume of a differential adiabatic two-chamber calorimeter chamber by filling the chamber with a medium with a known density, characterized in that, in order to achieve accuracy and simplification

the heater 6 and the resistor 21 for the regulation procedure of the calibration of the calorimeter, starting the current of the heater 6. 30 - the first chamber is filled with medium with

The volume of the first chamber 1 is determined as follows.

Chambers 1 and 4 are filled through tubular inlets 2 and 5 with the first medium for which the values of specific heat capacity and density are known. Include calorimeter in the mode of heating cameras. With 3Tcftvi, the high stability heaters 3 and 6 are supplied with a warm-up current and a compensation current. The controller 10 using the sensor 12 temperature difference and the heater 13 maintains the temperature of the shell I1 equal to the temperature of the chamber 4, which eliminates heat exchange with the external environment. When the temperature of chambers 1 and 4 reaches a certain value, the effect on resistor 17 is controlled by the current in heater 3 so that the temperature difference between chambers 1 and 4 is zero. The monitoring is carried out according to the recorder 9. The readings of the voltmeters 15 and 16 are taken and, for example, using a stopwatch, they determine the rate of heating of the chambers in a certain fixed temperature range. Using the readings of voltmeters 15 and 16, the power in the heater 3 is determined. Then the chambers 1 and 4 are cooled and the chamber 1 is filled with another medium

 The working volume of the second chamber 4 can be determined similarly, with

As with the first heating, I act on the resistor 17 to regulate the current in the Z. heater, so that the temperature difference between the chambers 1 and 4 is equal to zero. The monitoring is carried out according to the recorder 9. A second reading of voltmeters 15 and 16 is taken in the initial temperature range. The working volume of the chamber is calculated by the shape. The working volume of the second chamber 4 can be determined in a similar way;

This uses voltmeters 19 and 20 and resistors 21 and 18.

I eat the second chamber 4 mol similarly, when

the invention

5 The working volume of the second chamber 4 can be determined similarly, with

The method for determining the working volume of a differential adiabatic two-chamber calorimeter chamber by filling the chamber with a medium with a known density, characterized in that, in order to achieve accuracy and simplification

35

the first and second chambers are heated, the heating current of the first chamber is controlled with equal chambers temperatures, the heating rate and power in the first chamber heater are measured in a fixed temperature interval, the chambers are cooled and the first chamber is filled with another medium with a known heat capacity dd and density, reheat the chambers in the first heating mode, measure the heating current of the first chamber with equal chambers temperatures, measure the power in the heater of the first chamber in the same temperature interval ale, the working volume V of the first chamber is calculated by the formula

45

VPI: -

V (c, f), - c, p,)

where V is the heating rate of the chambers;

c and, specific heat capacity, of the first and second media, respectively;

P and p are the densities of the first and second media, respectively;

PJ and P, j are the power in the heater of the first chamber when the first and second media are heated, respectively.

Claims (1)

₂₀ claims A method for determining the working volume of a chamber of a differential adiabatic scanning two-chamber calorimeter 25 by filling the chamber with a medium with a known density, characterized in that, in order to increase the accuracy and simplify the calorimeter calibration procedure, first the first chamber is filled with a medium with a known heat capacity, the first and second chambers are heated, they regulate the heating current of the first chamber when the temperature of the chambers is equal, measure the heating rate and power in the heater of the first chamber in a fixed temperature tore off, cool the chambers and fill the first chamber with another medium with a known 4Q heat capacity and density, reheat the chambers in the first heating mode, measure the heating current of the first chamber when the temperature of the chambers is equal, measure the power in the heater of the first chamber 45 in the same temperature range, and the working the volume V of the first chamber is calculated by the formula V _{_} ________ V (c, p ₍ -c, p,) 'where V is the heating rate of the chambers; s., And c _{Q are the} specific heat of the first and second medium, respectively; and p is the density of the first and second medium, respectively; P ₍ and P _Q - power in the heater of the first chamber when heating the first and second medium, respectively.