JPS6363059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a method for detecting the maximum value of instantaneous heat quantity in a calorimetry system.

B. Conventional technology In the heat supply business, heat is supplied using cold water or hot water as a heat medium, but in order to perform heat management suitable for the energy-saving era, a calorimetry system that understands the amount of heat from multiple aspects is used. . This calorimetry system consists of a flowmeter that measures the flow rate of the heat medium, a temperature sensor that detects the temperature at the inlet and outlet of the heat load, and electrical signals from these to calculate the current and maximum values of the cumulative amount of heat and instantaneous amount of heat. It consists of three parts of the arithmetic unit that displays the

The current value and maximum value of hot heat amount are important data for thermal energy management, such as management and effective use of consumed heat amount, determination of supply equipment scale and expansion plans on the supply side, and effective use of thermal energy. , the current value is displayed by converting the current value of the instantaneous amount of heat, which is changing every moment, into the amount of heat consumed per hour. Further, the maximum value is displayed by comparing the current value with the stored maximum value in the past every time the current value changes, and always leaving the larger one as the maximum value in the memory.

However, if the heat supply is stopped for a long time, the temperature of the heat exchanger, pipes, etc. will be almost room temperature.
When heat supply is started again, a temperature difference larger than that caused by the heat load will occur due to heat absorption and heat loss in the pipes, etc., and the amount of heat consumed by the heat load will appear to be larger, and the maximum value of the instantaneous amount of heat will be , the apparently larger value A is memorized, and the actual maximum value B
There was a drawback that it could not be memorized and displayed. (See Figure 1) C. Purpose of the Invention The purpose of the present invention is to propose a method for detecting the maximum value of instantaneous calorific value that can overcome the drawbacks of the prior art, and to realize a calorific value measurement system that is more suited to the energy-saving era. . In other words, the apparent increased instantaneous amount of heat A when heat supply is restarted (Figure 1)
We propose a maximum value detection method that correctly stores the actual maximum instantaneous heat amount B without storing.

D. Structure and Examples of the Invention The maximum value detection method of the present invention detects the start of heat supply in a calorific value measurement system configured to detect the maximum value of instantaneous heat quantity, and detects the start of heat supply after a certain period of time has elapsed after the detection of the start of heat supply. The maximum value of the instantaneous heat amount is detected from , and will be described below based on the embodiments shown in the drawings.

In the embodiment shown in FIG. 4, reference numeral 1 denotes a heat generation source, and communication between the heat load 2 and the feed side pipe 3 and the return side pipe 4 is provided, and the feed side pipe 3 is provided with a device for detecting the inlet temperature of the heat load 2. A temperature sensor 5 is inserted into the return side piping 4, and a flow meter 6 and a temperature sensor 7 for detecting the outlet temperature are inserted, respectively. 8 is an arithmetic unit composed of an electronic circuit. The flowmeter is an electromagnetic flowmeter equipped with an open collector pulse output, and a flow rate detection section 9 that emits a pulse signal with a density proportional to the flow rate is installed to detect the flow rate and convert the flow rate into a current pulse signal. It is sent to the flow rate detection section 9 of the arithmetic device 8. The temperature sensors 5 and 7 detect the temperature at the inlet and outlet of the thermal load 2 as changes in their respective electrical resistance values, and send the detected temperature to the temperature difference detection unit 10 of the arithmetic unit 8, where it is converted into an electrical signal representing the temperature difference. This temperature difference is multiplied by the flow rate (instantaneous flow rate) detected by the flow rate detection section 9 by the heat amount calculation section 11 to calculate the instantaneous amount of heat.
Further, the amount of heat consumed per unit time is converted into the amount of heat consumed per hour by the unit time detector 12 and displayed, and also transmitted to the maximum value detector 14 . The flow rate signal from the flow rate detection section 9 is integrated by a flow rate integration section 15 and displayed on a display 16 as an integrated flow rate. Further, the instantaneous amount of heat calculated by the heat amount calculating section 11 is integrated by a heat amount integrating section 17 and displayed on the display 18 as an integrated amount of heat. The time setting section 19 detects that the instantaneous flow rate signal from the flow rate detection section 9 changes from a zero state (that is, a state where the flow rate is zero) to a certain level or more (that is, a change at the beginning of the flow), and at that time. This is an electric circuit that outputs a set time expiration signal when a certain period of time (this certain period of time is set in advance) has elapsed from When the unit starts operating, the maximum value of the instantaneous amount of heat converted to the amount of heat consumed per hour from the heat amount detection unit 12 per unit time is stored in a memory such as a semiconductor and displayed on the display 20. Further, when the flow rate signal becomes zero, the time setting section 19 works to disable the maximum value detection section 14.

By using a calorific value calculation device using a central processing unit instead of the above-described embodiment, it is possible to realize the same operation by appropriately determining the software.

E. Effects of the Invention According to this invention, when the instantaneous flow rate becomes more than a certain value from zero at the start of heat supply as shown in FIG.
The time setting section 19 detects this change in flow rate, and when the set time T has elapsed, outputs a set time expiry signal to put the maximum value detection section 14 into operation. Therefore, if the set time T is set in advance to be slightly longer than the time at which an apparent instantaneous increase in the amount of heat occurs due to heat absorption and heat loss by the pipes etc. at the start of heat supply, the maximum value will be reached as shown by the broken line in Figure 4. The memory can accurately leave only the actual maximum value. In other words, the apparent peak at the start of supply can be cut out, and the maximum value can be measured after reaching a steady state. Therefore, thermal energy management in cooling, heating, hot water supply, etc. can be carried out more effectively.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining the drawbacks of the prior art, Fig. 2 is a block diagram of an embodiment of a calorimetry system embodying the present invention, Fig. 3 is a diagram of flow rate changes, and Fig. 4 3 is a diagram illustrating the effect of the present invention when the flow rate changes as shown in FIG. 3. FIG.

Claims (1)

[Claims] 1. In a calorific value measurement system configured to detect the maximum value of instantaneous heat amount, detecting the start of heat supply,
A method for detecting a maximum value of instantaneous heat amount, characterized in that the maximum value of instantaneous heat amount is detected after a certain period of time has elapsed from the start of heat supply. 2. The method for detecting the maximum value of instantaneous heat amount according to claim 1, wherein detecting the start of heat supply is detecting a change in the flow rate of the heat medium from zero.