JP3969701B2 - Air conditioning equipment management device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner management apparatus that detects an abnormality in an air conditioner that performs air conditioning by circulating a heated or cooled fluid through a flow path.
[0002]
[Prior art]
Heating equipment as an example of air conditioning equipment is configured to heat each room by circulating hot water heated by a boiler through a flow path that passes through each room of a building. Conventionally, in order to manage such air conditioning equipment, the flow rate of hot water, pressure, and other physical quantities are measured with sensors, and abnormalities are determined based on whether each physical quantity is within a predetermined reference range. Judgment was made.
[0003]
[Problems to be solved by the invention]
By the way, for example, when a constant flow of hot water is sent from the boiler to the flow path, there is a fixed relationship between the flow rate of the hot water (= [flow rate] / [cross-sectional area of the flow path]) and the pressure. Is established. Therefore, if the flow rate of the hot water changes, the pressure of the hot water changes accordingly. As described above, in the air conditioning equipment, in general, any one of a plurality of parameters related to the air conditioning fluid has a certain relationship with each other and interlocks.
[0004]
However, conventionally, the abnormality determination is performed only based on whether or not the measured data of each parameter relating to the fluid is within a reference range provided separately. Specifically, with regard to the heating equipment described above, conventionally, it has been separately checked whether the flow rate and pressure of hot water are within a predetermined reference range. That is, even when the flow rate and pressure of the hot water have a certain relationship shown by the graph G1 in FIG. 4 , they are surrounded by the upper and lower limits of the flow rate and pressure regardless of the graph G1. The abnormality determination is performed based on whether or not the actually measured data is within the rectangular range W1.
[0005]
Therefore, for example, as shown at point D2 in FIG. 4 , when the measured data of the flow velocity and the pressure are both close to the lower limit values and are on the theoretical curve G1, as shown at the point D3. The case where the measured flow velocity data is close to the lower limit value and the measured pressure data is close to the upper limit value and deviates greatly from the theoretical curve G1 is not distinguished and there is no abnormality. It was judged.
[0006]
In other words, conventionally, the abnormality determination is performed based only on whether or not the actual measurement values of the parameters related to the fluid are within the reference ranges provided separately, and therefore there is a certain relationship between the parameters. An anomaly with a phenomenon that collapsed could not be detected.
[0007]
The present invention has been made in view of the above circumstances, and an object thereof is to provide an air conditioning equipment management apparatus capable of managing air conditioning equipment in more detail than before.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an air conditioning equipment management apparatus according to the invention of claim 1 detects an abnormality of an air conditioning equipment that performs air conditioning by circulating a fluid forcibly heated or cooled by a heat source through a pipe. An air-conditioning equipment management apparatus, which is attached to two locations of a pipe and which measures a flow velocity and a pressure of a fluid, a pair of sensor heads, a flow velocity and pressure measured by one sensor head, A total of four actual measurement data including the actual measurement data of the flow velocity and pressure measured by the sensor head is taken, and any three of the four actual measurement data are substituted into the Bernoulli equation and the reference value for the remaining one actual measurement data while calculating a, and a signal processing unit for the remaining one measured data to determine the presence or absence of abnormality based on whether a match to a reference value within a predetermined range Toko To have the feature.
[0011]
[Action and effect of the invention]
In the air-conditioning equipment management apparatus according to claim 1, measured data of flow velocity and pressure measured by one sensor head at one location of the pipe, and measured data of flow velocity and pressure measured by another sensor head at another location of the pipe, Are taken into the signal processing unit, and any three of the four actual measurement data are substituted into the Bernoulli equation, and a reference value for the remaining one actual measurement data is calculated. Then, the presence / absence of abnormality is determined based on whether or not the remaining one actually measured data matches the reference value within a predetermined range. As described above, according to the present invention, it is possible to detect an abnormality (for example, fluid leakage) where the Bernoulli equation does not hold between the two measured data in the pipe, and the air conditioning equipment is managed in more detail than before. It becomes possible.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
<First Embodiment>
Hereinafter, a first embodiment in which the present invention is applied to the heating plant 10 of the air conditioning equipment will be described with reference to FIGS. The heating equipment 10, as shown in FIG. 1, the pipe 1 1 passing through the respective room 50 in the building running hot water (corresponding to the "fluid" of the present invention), and heat radiation from the pipe 11 thermally, each The room 50 is heated.
[0015]
The heating facility includes a boiler 12 as a heat source of the present invention and a pump (not shown) for sending hot water to the pipe 11. And by setting these pumps and the boiler 12, hot water of a predetermined temperature can be made to flow through the pipe 11 at a predetermined pressure and flow rate.
[0016]
The pipe 11 has a structure in which a plurality of branch portions 14 are extended from the trunk portion 13 toward each room 50. The trunk section 13 includes an outward path 13A through which the hot water supplied from the boiler 12 flows, a return path 13B for returning the hot water to the boiler 12, and a bypass 13C that connects the forward path 13A and the return path 13B.
[0017]
Each branch portion 14 is provided in parallel with the bypass 13C so as to connect the forward path 13A and the return path 13B, whereby hot water is distributed from the forward path 13A to each branch portion 14 and each branch portion 14 The hot water that has passed through 14 is collected in the return path 13B. Moreover, the branch part 14 meanders in each room 50, and the surface area in the room 50 is ensured widely, Furthermore, the warm water which flows through the branch part 14 by operation of the valve | bulb 15 provided in the middle of the branch part 14 is ensured. The flow rate can be changed.
[0018]
Management devices 20 and 20 are provided at the proximal ends of the forward path 13A and the return path 13B of the pipe 11, respectively, and actual measurement data output from the management apparatuses 20 and 20 is taken into the signal processing device 40 and processed. Has been. The signal processing device 40 and the two management devices 20 constitute an air conditioning equipment management device according to the present invention. As shown in FIG. 2, the management device 20 fixes the flow sensor 21, the temperature sensor 22, and the pressure sensor 23 together in one sensor head 24, and the signal processing unit 30 is integrated with the sensor head 24. is the name of the formed structure.
[0019]
The sensor head 24 has, for example, a cylindrical shape as a whole, and is inserted into a sensor mounting cylinder 25 that communicates with the bypass 13 </ b> C of the pipe 11. The flow sensor 21 is provided at the shaft core portion of the sensor head 24. The flow sensor 21 is an electromagnetic flow meter, and includes a coil 27 wound around a core 27 extending to the shaft core portion of the sensor head 24, and a pair of electrodes 29, 29, and the tips of the electrodes 29, 29 are projected into the pipe 11. And the electromotive force which arose between the electrodes 29 and 29 is detected because warm water flows through the alternating magnetic field produced | generated by the coil 28 orthogonally, and the flow volume of warm water corresponding to this electromotive force is measured.
[0020]
Further, a thermistor as a temperature sensor 22 is provided near the outer surface of the tip of the sensor head 24. Further, the sensor head 24 is provided with a communication path 26 that is open at the distal end surface, and a pressure sensor 23 is provided at the back of the communication path 26. The pressure sensor 23 is configured to measure the pressure of hot water based on the deformation amount of the diaphragm 23 </ b> A provided in the inner part of the communication path 26.
[0036]
The signal processing device 40 has a configuration including an MPU (not shown) as a main part and includes a ROM and a RAM, and performs signal processing by running a main program M2 stored in the ROM. As shown in FIG. 3 , in the main program M2, first, the flow rate and pressure of hot water measured by each management device 20, 20 are taken in (S30). Here, when the flow velocity and pressure taken from one management device 20 are hereinafter referred to as flow velocity V1 and pressure P1, and the flow velocity and pressure taken from the other management device 20 are assumed to be flow velocity V2 and pressure P2, Bernoulli. From the (Bernoulli) equation:
[0037]
P1 + C1 · V12 = P2 + C1 · V22 + C2 (1)
[0038]
Is established. However, in the above formula (1) , C1 is a constant obtained by dividing the unit mass w by 2, and C2 is the gravitational acceleration g and unit mass to the height difference h of the pipe 11 to which both the management devices 20 and 20 are attached. It is a constant multiplied by w. In the main program M2, the three actually measured data P2, V1, and V2, excluding the pressure P1, for example, out of the four actually measured data P1, P2, V1, and V2, are substituted into the above equation (1) . The pressure reference value P0 is calculated (S31).
[0039]
Next, it is checked whether or not the reference value P0 of the pressure and the actually measured pressure P1 match within the predetermined loss range C3 (S32). If they do not match, the remote display unit 36 is warned. Display is performed (S33). Specifically, for example, when a situation occurs in which hot water leaks from the pipe 11, the Bernoulli equation does not hold, so the pressure reference value P0 and the actually measured pressure P1 are within a predetermined loss range C3. The occurrence of abnormality can be detected. Thus, according to the present embodiment, it is possible to manage the heating equipment 10 (air conditioning equipment) in more detail than before, and to detect abnormalities at an early stage.
[0040]
<Other embodiments>
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.
(1) In the above embodiments, the management device 20 is installed in the heating facility 10 as an air conditioning facility. However, the management device 20 may be installed in a cooler. That is, the “heat source” in the present invention includes a cold heat source.
[0041]
(2) Although the flow sensor 21 provided in the management device 20 of each of the above embodiments is an electromagnetic flow meter, the flow meter is not limited to this, and may be, for example, a flow meter using an orifice or a venturi tube. Good.
[0043]
(3 ) Moreover, this invention is applicable to the abnormality detection apparatus of the equipment (For example, heat exchanger in a chemical plant etc.) provided with the flow path other than an air conditioning equipment.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of heating equipment (air conditioning equipment) according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a management device. FIG. 3 is a flowchart of a main program run by a signal processing device . Graph showing the relationship between flow velocity and pressure, and the standard range for conventional anomaly discrimination 【Explanation of symbols】
10. Heating equipment (air conditioning equipment)
11 ... Pipe 12 ... Boiler (heat source)
DESCRIPTION OF SYMBOLS 20 ... Management apparatus 21 ... Flow sensor 22 ... Temperature sensor 23 ... Pressure sensor 30 ... Signal processing part 40 ... Signal processing apparatus (signal processing part)

Claims (1)

An air conditioner management device that detects an abnormality in an air conditioner that performs air conditioning by circulating a fluid that is forcibly heated or cooled by a heat source to a pipe ,
A pair of sensor heads attached to two locations of the pipe for measuring the flow velocity and pressure of the fluid, respectively;
One of the four actual measurement data, which is a total of four actual measurement data, that is, the actual measurement data of the flow velocity and pressure actually measured by one of the sensor heads and the actual measurement data of the flow velocity and pressure actually measured by the other sensor head. Substituting the three actually measured data into the Bernoulli equation and calculating a reference value for the remaining one actually measured data, and determining whether or not there is an abnormality based on whether the remaining one actually measured data matches the reference value within a predetermined range. An air conditioning facility management apparatus characterized by comprising a signal processing unit for determining presence or absence .

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