JPS6244352Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a simple calorimeter, and in particular, to a simple calorimeter that is designed to be easier to use.

For example, in a multi-tenant building that uses a central heating system using hot water, etc., it is necessary to measure the cumulative amount of heat consumed by the hot water heaters installed on each floor or in each room, for example, on a monthly basis. This also applies when a central cooling system using chilled water is used.

In this way, when measuring the amount of heat consumed, it is relatively easy to measure when the so-called heat load conditions are the same, but for example, if the flow rate of hot water flowing into each heater is different, or the temperature of the hot water flowing in If the conditions are different, each requires a measuring device that meets these conditions. In other words, measurement devices with different specifications are required. For this reason, there was a problem that the entire measurement system became expensive.

This invention was made in view of these circumstances, and its purpose is to have a simple structure that can be adapted to all thermal conditions, and to be easy to use, for example, in a multi-measurement system. The object of the present invention is to provide a simple calorimeter that can contribute to lowering the cost of the entire system when configured.

The details of this invention will be explained below with reference to illustrated embodiments. The figure shows an example in which the device according to this invention is incorporated into a hot water supply system.

In FIG. 1, numeral 1 indicates a feed pipe through which hot water sent from a hot water boiler (not shown) flows, and numeral 2 indicates a return pipe through which hot water is returned to the hot water boiler.

A heat load such as a heater 5 and a hot water supply heat exchanger 6 are connected in parallel between the feed pipe 1 and the return pipe 2 via branch pipes 3 and 4.
A valve 7 and a flow control valve 8 are interposed in series in the above order from the feed pipe 1 side toward the heat load side in the branch pipe 3, and a valve 9 is interposed in series in the branch pipe 4. be. Note that the flow rate control valve 8 is juxtaposed with an indicating mechanism that indicates the degree of opening thereof, that is, a scale corresponding to the flow rate of hot water flowing through the valve 8. The temperature of the hot water flowing through each of the outlet of the flow rate control valve 8 and the inlet of the valve 9 is detected,
First and second temperature detectors 10 and 11 are provided that output electrical signals corresponding to this temperature, and the output signals of the first and second temperature detectors 10 and 11 are sent to a temperature difference integrator 12. It has been introduced.

The temperature difference integrator 12 is configured as shown in FIG. 2, for example. That is, the output signals T ₁ and T ₂ of the first and second temperature detectors 10 and 11 are introduced into the input terminal of the differential amplifier 13. This differential amplifier 13 is configured such that its gain can be varied by varying the resistance value of a variable resistor 14 by operating an externally protruding knob. More specifically, by adjusting the knob to the indication scale of the flow rate control valve 8, it is possible to set a gain corresponding to the flow rate. Thus, the voltage signal output from the differential amplifier 13 is converted by the voltage-frequency converter 15 into a signal with a frequency proportional to the voltage, and this signal is passed through the frequency divider 16 to the activation signal of the counter 17. It has come to be given as In addition, numeral 21 in FIG. 1 indicates a three-way valve capable of selectively short-circuiting the hot water inflow end and the discharge end of the heat load.

With such a configuration, the first temperature detector 1
The difference between the output signal T ₁ of 0 and the output signal T ₂ of the second temperature detector 11 is amplified by the differential amplifier 13, and this signal is sent to the counter 17 via the voltage-frequency converter 15 and the frequency divider 16. Since it is given as an energizing signal, the indicated value of the counter 17 is proportional to the cumulative amount of heat (integral value) consumed by the heat load. Furthermore, if the resistance value of the variable resistor 14 is set in accordance with the indication scale of the flow rate control valve 8, and the gain of the differential amplifier 13 is set, the indication value of the counter 17 will be an integrated value of the consumed heat amount taking into account the flow rate. It will be proportional to. Therefore, as long as the flow rate, that is, the relationship between the indicated value of the counter 17 at each gain of the differential amplifier 13 and the integrated heat amount, is determined in advance, the heat exchange for hot water supply with the heater 5 can be started immediately from the indicated value of the counter 17. It is possible to know the integrated value of the amount of heat consumed by the device 6.

In this case, since the heat medium inlet temperature and outlet temperature of the heat load are detected by the first and second temperature detectors 10 and 11, respectively, it is possible to detect how the temperature of the heat medium changes. It is possible to accurately measure the cumulative amount of heat under any heat load. In addition, by changing the gain of the differential amplifier 13 of the temperature difference integrator 12, it is possible to set a so-called coefficient that matches the flow rate of the heat medium actually flowing. It is possible to measure everything up to the load with a measuring device having the same configuration, which not only improves ease of use but also contributes to lowering the price of the entire measuring system when performing multiple measurements.

In addition, in the above-described embodiment, when the heat load is not used, it is sufficient to short-circuit the three-way valve. If this is done, the outputs of the first and second temperature detectors 10 and 11 will be equal, so the counter 17 will be Not progressing. Of course, the input signal T ₁ ,
The configuration may be such that the introduction of T ₂ is stopped, the counter is disconnected, or the power to the temperature difference integrator 12 is turned off. Moreover, although the above-mentioned embodiment is an example in which it is incorporated into a hot water supply system, it is of course possible to incorporate it into a cold water supply system.

As described in detail above, according to this invention, it is possible to provide a simple calorimeter that can be adapted to any heat load and that can greatly improve ease of use.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of a simple calorimeter according to an embodiment of this invention, showing an example of the case where it is incorporated into a voltage supply system, and Fig. 2 is an explanatory diagram of the configuration of a temperature difference integrator in the device of the embodiment. be. 1... Send pipe, 2... Return pipe, 3, 4... Branch pipe, 5... Heater, 6... Heat exchanger for hot water supply, 8...
...Flow control valve, 10...First temperature sensor, 11
... second temperature detector, 12 ... temperature difference integrator,
13... Differential amplifier, 14... Variable resistor.

Claims (1)

[Scope of utility model registration request] A branch pipe that is connected to a feed pipe and a return pipe through which a heat medium flows and guides the heat medium to a heat load;
In a simple calorimeter installed in a system including a flow rate regulating valve provided upstream of the branch pipe and regulating the flow rate of the heat medium flowing through the branch pipe to a constant amount, the flow rate regulating valve of the branch pipe first and second temperature detectors that are provided downstream of the heat load and detect the heat medium inlet temperature and heat medium outlet temperature, respectively; and the difference between the output signals of these first and second temperature detectors. An amplifier that amplifies a signal and allows manual gain adjustment; a voltage-to-frequency converter that converts the output voltage from the amplifier into a frequency signal corresponding to the voltage value; and an output signal from the voltage-to-frequency converter. A simple calorimeter comprising: a frequency divider that divides the frequency of the frequency divider; and a counter that counts the output signal of the frequency divider.