JPH0862059A - Integrating calorimeter - Google Patents

Abstract

PURPOSE: To obtain an electronic integrating calorimeter capable of making highly accurate measurement of a temperature difference in consideration of the characteristics of temperature sensing parts on the inflow side and the outflow side and enabling highly accurate calculation of heat quantity. CONSTITUTION: This integrating calorimeter is constructed of temperature sensing parts 15 and 16 provided respectively on the inflow side and the outflow side of a heat exchange system, a signal converter part 17 converting outputs of these temperature sensing parts 15 and 16 on the inflow and outflow sides into numerical values, a flow rate metering part 18 generating a flow rate signal corresponding to the passing volume of a heating medium passing through the heat exchange system, a storage part 19 storing table data for converting the numerical values on the inflow and outflow sides obtained by conversion in the signal converter part 17 into temperature values respectively, and an arithmetic part 20 which calculates the temperature values on the inflow and outflow sides by conversion by reference to the table data, so as to obtain a temperature difference between them, and also calculates and integrates heat quantity on the basis of this temperature difference and the flow rate signal from the flow rate metering part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrating calorimeter for calculating and integrating a consumed heat amount by a temperature difference between an inflow side and an outflow side of a heat medium flowing through a heat exchange system and a passing volume of the heat medium.

[0002]

2. Description of the Related Art A heat medium such as hot water, which has been given heat energy by a heat supplier such as a central boiler, is delivered to a heat exchanger such as an air conditioner, and this heat exchanger supplies heat energy for heating and cooling. In a heat exchange system such as a district heating and cooling system that returns the consumed heat medium to the heat supply device again, the temperature of the inflow side and the outflow side of the heat medium is measured to obtain the temperature difference and An integrated calorimeter is used that calculates and integrates the heat consumption based on the volume passed. Here, the amount of heat can be calculated by the following equation (1).

Q = k · V · ΔT (1) where Q is the heat quantity (MJ) and k is the heat quantity conversion coefficient (MJ / ° C)
m3) and V are passing volumes (m3) of the heat medium, and ΔT is a temperature difference (° C). From this equation, it can be seen that the accuracy of the temperature difference affects the accuracy of the amount of heat.

By the way, in this type of conventional integrated calorimeter, the temperature difference between the inflow side and the outflow side of the heat medium is synthesized by, for example, a pressure type thermometer (Bourdon tube), and the rotational force by the flow rate is mechanically adjusted. It is equipped with a mechanical integrating calorimeter that multiplies with, a circuit that generates a pulse train that is proportional to the temperature difference, and a gate that opens for a fixed time each time a flow signal is input, and counts and integrates the number of pulses that have passed through this gate. The electric type integrated calorimeter that was used was common.

[0005]

However, in the mechanical type, if it is intended to achieve high precision, the mechanism becomes complicated and deterioration due to reliability and wear is unavoidable. Also, in the electric type, the temperature difference is converted into time or frequency such as pulse, but in general it is not possible to expect a highly accurate one due to variations in components and resolution, and the temperature sensor has an exponential function or polynomial function. However, it is impossible to measure the temperature difference with high accuracy because it is impossible to deal with the case where the temperature characteristic is non-linear.

Therefore, an object of the present invention is to provide an electronic integrated calorimeter capable of highly accurate temperature difference measurement in consideration of the characteristics of the temperature sensing parts on the inflow side and the outflow side and capable of highly accurate calorific value calculation. To provide.

[0007]

The integrated calorimeter according to the present invention comprises temperature sensing parts 15 and 16 respectively provided on the inflow side and the outflow side of the heat exchange system, and the temperature sensing parts 15 on the inflow side and the outflow side. A signal converter 17 for converting the output of 16 into a numerical value,
In order to convert the numerical values of the inflow side and the outflow side converted by the signal conversion unit 17 into the temperature values, the flow rate measuring unit 18 that generates a flow rate signal according to the volume of the heat medium that has passed through the heat exchange system. Storage unit 19 that stores the table data of
Then, with reference to this table data, the temperature values on the inflow side and the outflow side are converted, the temperature difference is obtained, and the calorific value is calculated from the temperature difference and the flow rate signal from the flow rate measuring section, and the calculation section 20 is integrated. It is characterized by having and.

[0008]

According to the present invention, the outputs of the temperature-sensing parts on the inflow side and the outflow side are subjected to analog / digital conversion by the signal conversion part and converted into numerical values according to the detected temperature. The storage unit stores temperature conversion values according to the characteristics of the inflow-side temperature sensing unit and the outflow-side temperature sensing unit,
It is stored as table data, and the numerical values of the inflow side and the outflow side converted by the signal conversion section are converted into temperature values in which the characteristics of each temperature sensing section are taken into consideration. Then, an accurate temperature difference is obtained from this, and the amount of heat is calculated from this temperature difference and the flow rate signal from the flow rate measuring unit based on (1) above.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a usage example in which an integrated calorimeter 10 according to the present invention is used in a district heating and cooling system. This system delivers a heat medium such as hot water, which has been given heat energy by a heat supplier 11 such as a central boiler, to a heat exchanger 13 such as an air conditioner through a feed pipe 12, and the heat exchanger 13 The heat medium that has consumed the heat energy for cooling and heating is returned to the heat supplier 11 through the return pipe 14.

The integrating calorimeter 10 according to the present invention has a heat exchanger 13 through a feed pipe 12 in such a system.
Inflow side temperature sensing unit 15 for detecting the temperature of the inflow side flowing into the
And an outflow side temperature sensing unit 16 for detecting the outflow side temperature returning to the heat supplier 11 through the return pipe 14, and these temperature sensing units 15.1
The signal conversion unit 17 that converts the output potential of 6 into a numerical value according to the temperature, the flow rate measurement unit 18 that generates a flow rate signal according to the passing volume of the heat medium that has passed through the heat exchanger 13, and the signal conversion unit 17 A storage unit 19 that stores table data for converting each of the converted inflow-side numerical value and outflow-side numerical value into a temperature value, and refers to the table data to convert the inflow-side and outflow-side temperature values, The calculation unit 20 obtains the temperature difference between the inflow side and the outflow side, and calculates and integrates the amount of heat from this temperature difference and the flow rate signal from the flow rate measurement unit 18.

FIG. 2 shows an embodiment of the integrated calorimeter 10 according to the present invention. In this integrated calorimeter, temperature measurement is performed at preset time intervals or every time a flow rate signal is input from the flow rate measuring unit 18. Output potentials (analog signals) of the inflow side temperature sensor 15a and the outflow side temperature sensor 16a are amplified by an amplifier circuit 21, and further, by an A / D converter 22, hexadecimal numerical data (digital signal) according to the input potential. )
After being converted into, the data is input to the CPU (central processing unit) 23 which is the arithmetic unit and temporarily stored in the RAM (random access memory) 24 of the storage unit 19. CPU23
Corrects the inflow-side and outflow-side numerical data stored in the RAM 24 with reference to the table of the ROM (read only memory) 25 of the storage unit 19. That is, in the ROM 25, temperature conversion values according to the characteristics of the temperature sensors 15a and 16a are stored in advance as table data, and numerical data of each of the inflow side and the outflow side is stored as
The temperature value is converted according to the stored temperature conversion value. Then, the CPU 23 sets the converted inflow side temperature to T
1, the outflow side temperature is T2, and the temperature difference is ΔT, ΔT =
| T1-T2 | is calculated, and the result is stored in the RAM 24. Next, the CPU 23 calculates and integrates the heat quantity based on the above (1) from the temperature difference ΔT and the flow rate signal from the flow rate measuring unit 18.

[0012]

According to the present invention, since the temperatures detected by the temperature sensing parts on the inflow side and the outflow side can be treated as numerical values, correction and approximation processing can be performed by calculation, and the characteristics of the temperature sensing parts can be determined. Since it can be converted into a temperature value with consideration, even if the characteristic of the temperature sensing part is nonlinear (exponential function or polynomial function), accurate temperature and temperature difference can be obtained, and a highly accurate integrated calorimeter can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a usage example in which a calorimeter according to the present invention is used in a district heating and cooling system.

FIG. 2 is a block diagram of an embodiment of a calorimeter according to the present invention.

[Explanation of symbols]

 10 Integrated calorimeter 15 Inflow side temperature sensing part 15a Inflow side temperature sensor 16 Outflow side temperature sensing part 16a Outflow side temperature sensor 17 Signal conversion part 19 Storage part 20 Calculation part 21 Amplification circuit 22 A / D converter 23 CPU 24 RAM 25 ROM

Claims (1)

[Claims] 1. An integrating calorimeter for calculating and integrating a consumed heat amount based on a temperature difference between an inflow side and an outflow side of a heat medium flowing through a heat exchange system and a passing volume of the heat medium, the inflow side and the outflow side respectively. A temperature sensing unit provided, a signal converting unit that converts the outputs of the temperature sensing units on the inflow side and the outflow side into numerical values, and generates a flow rate signal according to the passing volume of the heat medium that has passed through the heat exchange system. A flow rate metering unit, a storage unit that stores table data for converting each of the inflow side numerical value and the outflow side numerical value converted by the signal conversion unit into a temperature value, and the inflow side by referring to the table data. The integrated heat quantity is characterized in that the temperature value on the outflow side is converted and the temperature difference is obtained, and a calculation section for calculating and integrating the heat quantity from this temperature difference and the flow rate signal from the flow rate measuring section is provided. Total.