JPS6237148Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature integrator that displays the amount of heat supplied to each consumer in a central heating and cooling system as the product of temperature and time.

Conventionally, in condominiums and the like where central heating and cooling is performed, calorimeters have been generally used to measure the amount of heat consumed by each tenant. This calorimeter detects and calculates the temperature and flow rate of a heat medium. However, the capacity of the fan coil that supplies heat to each tenant is determined by the flow rate of the heat medium, and each fan coil has a
Due to the need for system efficiency, the flow rate is adjusted to be constant. Therefore, if the product of the temperature difference between the entrance and exit of the fan coil and the operating time can be calculated as the amount of heat consumed in such a place, this can be used as a substitute unit for the amount of heat consumed.

The object of the present invention is to provide an instrument for integrating the product of differential temperature and operating time, which is used where the flow rate of the medium flowing through the fan coil is constant.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below as illustrated in the accompanying drawings.

In Fig. 1, central heating and cooling heat medium pipes 2 and 4
There is a fan coil 6 having a heat exchanger connected thereto with branched pipes between them. A temperature sensor 10 is installed at the heat medium inlet 8 of the fan coil 6.
A similar temperature sensor 14 is also provided at the heat medium outlet 12. Each temperature sensor 10,1
4 is connected to a temperature difference detection circuit 16, where the temperature difference between the entrance and exit of the fan coil 6 is determined. The output of the differential temperature detection circuit 16 is connected to one input of the gate 18 and one input of the comparison circuit 20, the other input of the gate 18 is connected to the output of the comparison circuit 20, and the other input of the comparison circuit 20 is connected to the operating temperature setting circuit 22.
are connected to each. The output of the gate 18 is connected to a temperature-time calculation circuit 24 and further to an integrated circuit 26.
and is connected to the display section 28.

In the embodiment of FIG. 1, temperature sensor 10,
14 is a crystal oscillation type temperature sensor, therefore,
Each temperature at the heat medium inlet 8 and outlet 12 of the fan coil 6 is output in the form of a pulse signal converted into a frequency. This crystal oscillation type temperature sensor is
As shown in FIG. 2, the oscillation frequency has a characteristic of changing linearly with respect to temperature, and by setting the oscillation frequency high, very high resolution can be easily obtained. Further, as shown in FIG. 2, both temperature sensors 10 and 14 detect the temperature of the heat medium.
It is assumed that it is adjusted to have an oscillation frequency of ₀ [Hz] at T ₀ and has a temperature coefficient of K [Hz/°C]. Assuming that heating operation is currently being performed, the temperature at the inlet 8 of the fan coil 6 is T ₀ ×t ₂ [℃], and the temperature at the outlet 12 is T ₀ +t ₁ [℃]. The temperature sensor 10 outputs a frequency signal of ₀ +K×t ₂ , and the outlet temperature sensor 14 outputs a frequency signal of ₀ +K×t ₁ . Several methods are known for detecting the temperature difference from these outputs. For example, once -V
There are methods such as converting each signal into an analog signal through a converter and then obtaining the difference using a differential amplifier, or directly detecting the frequency difference and indirectly determining the difference temperature, but in this example, the difference temperature detection circuit 1
6, the frequency difference between both temperature sensors is detected.

The two input signals received by the differential temperature detection circuit 16 are processed as follows. In other words, if the frequency difference of the output is expressed as Δ, then Δ=|( ₀ +Kt ₂ )−( ₀ +Kt ₁ )| = |K(t ₂ −t ₁ )|, where |t ₂ −t ₁ | is the difference Since the temperature is
It can be seen that the frequency difference Δ is expressed by a proportional equation in which the temperature difference has a proportional stationarity of K.

The differential temperature detection circuit 16 can be realized, for example, by one AND or NAND gate adapted to receive pulse signals from the two temperature sensors 10 and 14.

Here, when the temperature difference is 1°C, the number of output pulses n of the temperature difference detection circuit 16 per hour is: n = Δ x 3600 [seconds] = |K (t ₂ - t ₁ ) | x 3600 = 3600K becomes.

Next, the temperature/time calculating circuit 24 is constituted by, for example, a frequency divider with a frequency division number N, and divides the value of the unit quantity n which is the output of the differential temperature detection circuit 16. In other words, the output of the temperature time calculation circuit is 1°C x h per pulse.
This signal is sent to the integration circuit 26, and the integrated amount is displayed on the display section 28.

In reality, even when the fan coil 6 is not used, a temperature difference always occurs between its entrance and exit, and there is also a detection error in the crystal oscillation type temperature sensors 10 and 14, which have the same configuration, so the difference temperature exceeds a certain value. It is best not to integrate up to that point.
Therefore, the output of the temperature difference detection circuit 16 is compared with the set temperature difference from the operating temperature setting circuit 22 in the comparison circuit 20, and this output is applied to the gate 18, and the output signal of the temperature difference detection circuit 16 is used for temperature time calculation. It is used as an enable signal for passing to the circuit.

Although the present invention has been described above in detail with respect to a preferred embodiment thereof, the present invention is not limited to this specific embodiment. For example, the temperature sensor can employ other temperature sensing elements, such as a resistance temperature detector, a thermocouple, or the like. Further, by providing a -V converter between the differential temperature detection circuit and the comparison circuit, an analog comparator can be used as the comparison circuit. Furthermore, in the temperature-time calculation circuit, the frequency division number was set to N, and a heat amount display signal of 1°C/h was obtained per output pulse, but this display is set to, for example, 0.001°C/h as the minimum display unit.
If so, the frequency division number should be set to 1000N. Furthermore, if this frequency division value can be set freely using, for example, a digital switch, it is also possible to correct differences in temperature-frequency differences due to differences in temperature sensors.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a temperature integrator according to the present invention, and FIG. 2 is a diagram showing an example of characteristics of a crystal oscillation type temperature sensor. 2, 4... Heat medium piping, 6... Fan coil,
8... Heat medium inlet, 10... Temperature sensor, 12...
...Heat medium outlet, 14...Temperature sensor, 16...Difference temperature detection circuit, 18...Gate, 20...Comparison circuit, 22...Operating temperature setting circuit, 24...Temperature time calculation circuit, 26...Integration Circuit, 28...display section.

Claims (1)

[Scope of utility model registration request] Two temperature sensors each detecting the entrance and exit temperatures of a heat exchanger in which the flow rate of the heat medium is adjusted to be constant, a difference temperature detection circuit that calculates a difference temperature from the detected temperatures of these temperature sensors, and a predetermined value of the detected difference temperature. The present invention is characterized by comprising a circuit for disabling the temperature below a predetermined value, a temperature-time calculation circuit for calculating the product of a temperature difference greater than a predetermined value and time, and a circuit for integrating and displaying the output of the temperature-time calculation circuit. Temperature totalizer.