JP2007255745A - Heat source device, and control method and control program for flow rate of heating medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat source device utilizing a heating medium, optimizing the flow of the heating medium according to the heat demand on the heated fluid side without measuring the flow of the heating medium, eliminating the need of making special adjustment for every installation condition of the heating device, and achieving stable supply of the heating medium without influence of fluctuation of differential pressure caused in the supplied heating medium due to the working status of the heat source device. <P>SOLUTION: This heating source device taking the continuously supplied heating medium as a heat source achieves efficient heat exchange by utilizing limited heat exchange information such as a required heating value on the heated fluid side for exchanging heat with the heating medium without measuring the flow of the heating medium, differential pressure of the heating medium side, a temperature change and so on to optimize the flow of the heating medium. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a heat source device that uses the heat of a heating fluid such as hot water or heating gas or the cooling fluid such as cold water or cooling gas as a heat source, and in particular, according to the demand for hot water supply without considering flow rate information on the heat medium side. The present invention relates to a heat source device that controls the flow of a heat medium, a control method for the flow rate of the heat medium, and a control program.

  As a heat source device that uses an externally provided heat medium as a heat source, such as a heat supply plant, factory exhaust, or other heat source device, for example, in an apartment house or various facilities, indirectly through heat exchange between the heat medium and the fluid to be heated A heat source device using a so-called liquid-liquid heat exchanger for heating is known. By using the heat of the heating fluid or cooling fluid supplied from the outside as a heat source to generate a heat medium and supplying it to each heat source device that uses this heat medium as a heat source, the heat can be used effectively. Because it does not generate a large amount of heat, it can save energy, and there is no need to install heating means on the heat source device side, which contributes to simplification of equipment on the heat source device side and reduction of installation space There is.

With regard to such a heat source device, mixing that adjusts the hot water supply temperature in a configuration in which a heat medium supplied from the outside is used as a heat source for hot water supply, bath tracking, heating, etc., and heat exchange is performed between the heat medium and tap water. Patent Document 1 discloses a “hot water supply device” for eliminating waste of hot water supply capacity by installing a constant flow valve that adjusts the flow rate of clean water supplied to a valve and a heat exchanger. Moreover, about the heat exchange unit using the heat medium supplied from the outside, in order to improve the responsiveness with respect to the required temperature at the time of hot water supply, about keeping constant the heat medium temperature in a heat exchanger, patent document 2 " There is a "heat exchange unit". Furthermore, regarding a water heater that performs heat exchange of a heat medium supply type, there is a “hot water heater” of Patent Document 3 that prevents water from being heated more than necessary when performing bath hot water supply during heating operation. As for indirect hot water supply, there is an “indirect hot water supply device” of Patent Document 4 in which the flow rate of the heat medium is adjusted according to the differential pressure generated between the upstream side and the downstream side on the hot water supply side by opening the faucet.
Japanese Patent Laid-Open No. 08-200806 (paragraph numbers 0006 and 0007) JP 11-281069 A (paragraph numbers 0015 and 0016) JP 2004-278960 A (paragraph numbers 0014, 0027 to 0030) JP 59-225244 A

  By the way, in the case where the heat medium is supplied to a plurality of heat source devices, the amount of the supply heat medium is limited for each facility due to the heat medium supply capability and the like. In the heat source device that receives the supply of the heat medium from the outside, the differential pressure generated in the heat medium in the heat medium supply circulation path of each facility varies depending on the installation location and operation status, and this varies the heat medium flow rate. In order to suppress such fluctuations in the flow rate of the heat medium, for example, a constant flow valve, a mechanical proportional valve, or the like is used for each heat source device to take measures to regulate the heat medium supply amount.

  However, controlling the flow rate of the heat medium using a constant flow valve or the like has a disadvantage such as a large pressure loss on the heat medium supply circuit, and if the supply pressure for sending the heat medium to the circuit is low, There is also a disadvantage that the medium supply type heat source device cannot be used.

  Further, in the proportional control method using a mechanical proportional valve as the heat medium flow rate control means, in order to supply a certain amount of heat medium without considering the water temperature before heat exchange of clean water as the fluid to be heated, for example, Even if the water temperature of the clean water rises, the same amount of heat medium as that when the water temperature is low will be supplied to the heat exchanger, increasing the burden on the heat medium supply side, such as excessive supply of heat energy. End up.

  In addition, when supplying the heat medium to multiple heat exchangers, install the heat source device, such as the type of heating means that is the heat source, the pumping capacity to pump the heat medium to the circulation path, the number of facilities that use the heat medium, etc. Depending on the conditions, the pressure acting on the heating medium is not constant. For this reason, it is difficult to adjust the heat source device to match the installation conditions, and if a flow meter is always installed in the heat medium flow path to control the heat medium flow rate, a constant flow valve is used. Similarly, the flow path resistance is increased.

  Regarding such a problem, the above-mentioned Patent Documents 1 to 4 do not disclose the above, and do not disclose means and ideas for solving the problem.

  Therefore, an object of the present invention is to optimize the flow rate of the heat medium according to the heat demand on the heated fluid side without measuring the flow rate of the heat medium.

Another object of the present invention is that there is no need to make a special adjustment for each installation condition, and the stable heat generation is not affected by fluctuations in the differential pressure generated in the supplied heat medium depending on the usage conditions of the heat source device. It is to realize the supply of the medium.

  The present invention relates to a heat source device that uses a continuously supplied heat medium as a heat source, and does not measure the flow rate of the heat medium, and the required amount of heat on the heated fluid side that exchanges heat with the heat medium, By using limited heat exchange information such as differential pressure and temperature change, the heat medium flow rate is optimized and efficient heat exchange is realized.

  In order to achieve the above object, a first aspect of the present invention is a heat source device that uses a supplied heat medium as a heat source, and performs heat exchange between the heat medium and a heated fluid to be heated. Means, first temperature detecting means for detecting the temperature of the heated fluid, second temperature detecting means for detecting the temperature of the heating medium, and flow rate detecting means for detecting the flow rate of the heated fluid; A flow rate adjusting means for adjusting the flow rate of the heat medium supplied to the heat exchange means, a heat medium flow rate at a reference differential pressure between the inlet side and the outlet side of the heat exchange means, and an adjustment amount of the flow rate adjusting means Storage means for storing, the detected flow rate of the heated fluid, the detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, and the before and after heat exchange by the second temperature detecting means The detected temperature of the heating medium, the flow rate of the heating medium in the storage means and the previous A control unit that obtains an adjustment amount of the flow rate adjusting unit corresponding to a required heat amount of the fluid to be heated without measuring the flow rate of the heating medium, and controls the flow rate adjusting unit to the adjustment amount, without measuring the flow rate of the heating medium. It is the structure provided with. With such a configuration, the above object can be achieved.

  In this heat source apparatus, preferably, the control unit detects the flow rate of the heated fluid, the detected temperature of the heated fluid before and after heat exchange by the first temperature detecting unit, and the second temperature detecting unit. Using the detected temperature of the heat medium before and after the heat exchange by obtaining the exchange heat amount, obtaining the current heat medium flow rate from the exchange heat amount, and obtaining the differential pressure of the heat medium corresponding to the reference differential pressure, The target heat medium flow rate is obtained from this differential pressure and the required heat amount on the heated fluid side, the adjustment amount of the flow rate adjusting means for the target heat medium flow rate is obtained, and the flow rate adjusting means is controlled to this adjustment amount. Also good. With such a configuration, the above object can be achieved.

  In this heat source device, preferably, the detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, the detected flow rate of the heated fluid by the flow rate detecting means, and the second temperature detecting means The target temperature of the heat medium after heat exchange is calculated from the detected temperature of the heat medium before heat exchange by the heat medium flow rate according to the required heat amount of the heated fluid, and the target temperature of the heat medium and the heat medium In this configuration, the amount of adjustment of the flow rate adjusting means is controlled so that the temperature difference from the temperature detected by the heat medium after heat exchange by the first temperature detecting means is within a predetermined range. Such a configuration can also achieve the above object.

  In order to achieve the above object, a second aspect of the present invention is a heat medium flow rate control method for a heat source device that uses a supplied heat medium as a heat source, and is provided between the heat medium and a fluid to be heated. A process of exchanging heat by the heat exchanging means, a process of detecting the temperature of the heated fluid by the first temperature detecting means, a process of detecting the temperature of the heating medium by the second temperature detecting means, A process for detecting the flow rate of the heating fluid, a process for adjusting the flow rate of the heat medium supplied to the heat exchange means by the flow rate adjustment means, and a reference differential pressure between the inlet side and the outlet side of the heat exchange means The flow rate of the heat medium, the process of storing the adjustment amount of the flow rate adjusting means, the detected flow rate of the heated fluid, the detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, and the first The temperature of the heat medium detected before and after the heat exchange by the temperature detecting means 2 Based on the heat medium flow rate and the adjustment amount in the storage means, the adjustment amount of the flow rate adjustment means corresponding to the required heat amount of the heated fluid is obtained without measuring the flow rate of the heating medium, and the adjustment amount And a process for controlling the flow rate adjusting means. Such a configuration can also achieve the above object.

  In the heat medium flow rate control method of the heat source device, preferably, the control processing includes a detected flow rate of the heated fluid, a detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, The amount of heat exchanged is determined using the detected temperature of the heat medium before and after heat exchange by the second temperature detection means, the current heat medium flow rate is obtained from the amount of heat exchanged, and the heat medium corresponding to the reference differential pressure The target heat medium flow rate is obtained from the differential pressure and the required heat amount on the heated fluid side, the adjustment amount of the flow rate adjusting means for the target heat medium flow rate is obtained, and the flow rate adjustment is performed on the adjustment amount. It is good also as a structure which controls a means. Such a configuration can also achieve the above object.

  In the heat medium flow rate control method of the heat source device, preferably, the detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, the detected flow rate of the heated fluid, and the second temperature detection The target temperature of the heat medium after heat exchange is calculated from the detected temperature of the heat medium before heat exchange by the means and the heat medium flow rate according to the required amount of heat of the fluid to be heated, and the target temperature of the heat medium The adjustment amount of the flow rate adjusting unit is controlled so that the temperature difference from the detected temperature of the heat medium after heat exchange by the first temperature detecting unit falls within a predetermined range. Such a configuration can also achieve the above object.

  The third aspect of the present invention for achieving the above object is a heat medium flow rate of a heat source device that is executed by a computer and exchanges heat between a supplied heat medium and a fluid to be heated by heat exchange means. It is a control program, the step of taking in the temperature of the heated fluid, the step of taking in the temperature of the heating medium, the step of taking in the flow rate of the heated fluid, and the heating medium supplied to the heat exchange means A step of adjusting the flow rate, a step of storing the flow rate of the heat medium at a reference differential pressure between the inlet side and the outlet side of the heat exchanging means, the adjustment amount of the flow rate, a detected flow rate of the heated fluid, and a heat The flow rate of the heating medium is measured based on the detected temperature of the heated fluid before and after the exchange, the detected temperature of the heating medium before and after the heat exchange, and the heating medium flow rate and the flow rate adjustment amount at a reference differential pressure. Not Determine the adjustment amount of the flow rate corresponding to the required amount of heat of the heating fluid, a configuration including the step of controlling the flow rate adjusting means in the adjustment amount. Such a configuration can also achieve the above object.

  In the heat medium flow rate control program of the heat source device, preferably, the control step includes the detection flow rate of the heated fluid, the detected temperature of the heated fluid before and after heat exchange, and the detection of the heat medium before and after heat exchange. The amount of heat exchanged is determined using the temperature, the current heat medium flow rate is determined from the amount of heat exchanged, and the pressure difference of the heat medium corresponding to the reference pressure difference is determined. A target heat medium flow rate may be obtained from the required heat amount, an adjustment amount of the heat medium with respect to the target heat medium flow amount may be obtained, and the flow rate of the heat medium may be controlled to the adjustment amount. Such a configuration can also achieve the above object.

In the heat medium flow rate control program of the heat source device, preferably, the detected temperature of the heated fluid before and after heat exchange, the detected flow rate of the heated fluid, the detected temperature of the heat medium before heat exchange, The target temperature of the heat medium after heat exchange is calculated from the heat medium flow rate corresponding to the required heat quantity of the heating fluid, and the temperature difference between the target temperature of the heat medium and the detected temperature of the heat medium after heat exchange is predetermined. It is good also as a structure which controls the flow volume of the said heat medium so that it may become in this range. Such a configuration can also achieve the above object.

  According to the present invention, the following effects can be obtained.

  (1) The required flow rate of the heat medium can be controlled by the required amount of heat on the heated fluid side, and efficient heat exchange can be realized.

  (2) Since control according to the current differential pressure applied to the heat medium is performed for each heat source device at the time of hot water supply or the like, there is no need to make a special adjustment according to the installation environment when the heat source device is installed.

  (3) Also, as described above, the differential pressure applied to the heat medium is measured and control is performed accordingly, so that the capacity of the heat source device is kept constant even if the differential pressure fluctuates during use of the heat source device. Can do.

  (4) By performing the control according to the differential pressure applied to the heat medium for each heat source device to which the heat medium is supplied, the load on the heating means can be reduced as a whole, and the energy efficiency can be increased.

(5) Since it is not necessary to install auxiliary equipment such as a constant flow valve that keeps the flow rate of the heat medium supplied to each heat source device constant, the cost of the equipment can be reduced and the circulation caused by the installation of auxiliary equipment Since there is little pressure loss in the road, it can be used even when the pumping force of the heat medium is small.

[First Embodiment]

  A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a heat exchange system using a heat source device according to the present invention.

  The heat exchange system 2 includes a heating unit 6 that supplies a heat medium 4 that is a heat source. The heat medium 4 is a fluid such as hot water, cold water, or steam, and has a heat amount necessary for heat exchange. The heat medium 4 may be oil or heated gas. The heating unit 6 includes gas, electricity, kerosene, a fuel cell and the like as the fuel, and converts the fuel into the heat medium 4 as energy.

  A main circulation path 8 for efficiently circulating the heat medium 4 to the consumer side is connected to the heating unit 6, and the main circulation path 8 includes an outward pipe 8A and a return pipe 8B. A constant flow valve 10 is connected to and connected to the end portion of the return pipe 8B. Although not shown, the heating unit 6 is provided with a pump for forcibly circulating the heat medium 4 to the main circulation path 8 or the like.

  The main circulation path 8 is branched into a plurality of branch circulation paths 81, 82, 83... 8N, and the heat medium 4 is supplied to the demand side through the respective branch circulation paths 81, 82, 83. . In this case, the branch circulation path 81 is the outgoing pipe 81A and the return pipe 81B, the branch circulation path 82 is the outgoing pipe 82A and the return pipe 82B, the branch circulation path 83 is the outgoing pipe 83A and the return pipe 83B, and so on. It consists of a tube 8NA and a return tube 8NB. Each of the outgoing pipes 81A, 82A, 83A,... 8NA and each of the return pipes 81B, 82B, 83B,. The unit of the branch circuit 81, 82, 83... 8N may be a dwelling unit or a facility. In this case, the branch circuit 81 is branched into a plurality of branch circuits 811, 812. The on / off valves 11 for switching the supply or stop of the heating medium 4 are also installed in the outgoing pipes 811A, 812A... 81NA and the return pipes 811B, 812B.

  In this case, the heat source device 20 using the heat medium 4 as a heat source is connected to the outgoing pipe 812A and the return pipe 812B of the branch circuit 812. In this embodiment, heat exchange between the heat medium 4 and the clean water W is performed. Thus, the hot water is supplied.

  According to such a configuration, a heat amount is supplied from the heat medium 4 according to the heat demand for the heat source device 20, and although not shown, heating medium heating or bathtub water heating is performed in addition to hot water supply.

  In addition, a discharge valve 12 is provided on the end side of the outgoing pipe 8A of the circulation path 8, and a discharge valve 13 is similarly provided on the end side of the outgoing pipe 81A of the circulation path 81, and the heat medium 4 in the circulation path 8 is discharged. It can be discarded by opening the valve 12, and the heat medium 4 on the circulation path 81 side can be discarded by opening the discharge valve 13.

  Next, the configuration of the heat source device 20 will be described with reference to FIG. FIG. 2 is a diagram illustrating a configuration example of the heat source device 20. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  The heat source device 20 has a configuration in which the heat medium 4 that has passed through the outgoing pipe 812A in the circulation path is circulated inside the heat source apparatus 20 to perform heat exchange, and is then discharged to the return pipe 812B in the circulation path.

  The heat source device 20 includes a heat exchanger 16 that performs hot water heating, a circulation path 812 that circulates the heat medium 4 to the heat exchanger 16, and a water pipe 26 that guides the clean water W to the heat exchanger 16. Yes. On the circulation path 812, a heat medium entrance temperature sensor 18 and a heat medium exit temperature sensor 22 are installed as second temperature detection means for detecting temperatures before and after heat exchange of the heat medium 4. A heat medium control valve 24 is installed on the outgoing pipe 812A of the circulation path 812 as a flow rate adjusting means for adjusting the flow rate of the heat medium 4 to the heat exchanger 16. The flow rate adjusting means is not limited to the heat medium control valve 24, and may be configured to use a pump or the like.

  For example, a water control valve 28, a bypass pipe 30, a bypass mixing valve 32, a water amount sensor 34 as a flow rate detection means, and a temperature of the water supply side are detected on a water pipe 26 through which, for example, clean water W flows as a fluid to be heated. As one temperature detection means, an incoming water temperature sensor 36, a hot water temperature sensor 38, and a mixed temperature sensor 40 are provided. In addition, a control unit 42 (FIG. 3) that performs hot water supply amount, flow rate control of the heat medium 4, and the like is provided. The bypass line 30 divides the clean water W into the inlet side and the outlet side of the heat exchanger 16. The water amount sensor 34 detects the flow rate of the clean water W, the incoming water temperature sensor 36 and the hot water temperature sensor 38 detect the temperature of the fresh water W before and after heat exchange, and the mixed temperature sensor 40 is used for heat exchange. The hot water temperature after mixing the subsequent hot water and the clean water W that has passed through the bypass conduit 30 is detected. The detection values detected by the various sensors are sent to the control unit 42. For example, a thermistor thermometer can be used for each temperature sensor on the circulation path 812 and the water pipe 26 described above.

  With regard to the heat exchange operation, for example, when the hot water tap is opened, when the water sensor 34 detects that the clean water W has flowed into the water pipe 26 and a certain amount of water has flowed, the heat medium control valve 24 is opened. And heat exchange is started in the heat exchanger 16. The hot water heated by the heat exchange is mixed with the low-temperature clean water W passing through the bypass pipe 30, and the opening degree of the bypass mixing valve 32 is controlled according to the temperature detected by the mixed temperature sensor 40. The temperature is adjusted to the desired temperature and discharged.

  Next, the controller of the heat source device will be described with reference to FIG. FIG. 3 is a diagram illustrating a configuration example of the control unit 42. In FIG. 3, the same parts as those in FIG.

The control unit 42 of the heat source device 20 is configured by a computer, and the inside thereof is a CPU (Central Processing Unit) 44, RAM (Random-Access Memory) 46 and ROM (Read-Only Memory) 48 as storage means, and CPU 44. A clock 50 for measuring operation timing and various times is provided. The ROM 48 stores various control programs such as a flow rate control program 300, a heat medium flow rate and valve opening calculation program 310, and a differential pressure calculation program 320. The heat medium flow rate and valve opening calculation program 310 is a program related to the heat medium flow rate and the adjustment amount of the flow rate adjusting means when the reference differential pressure is 1 [kgf / cm ² ], for example. The RAM 46 is used not only as a storage unit but also as a work area related to differential pressure calculation and flow rate control, which will be described later. For example, an EEPROM or the like may be used as a nonvolatile memory in addition to the RAM.

  In addition, the control unit 42 issues an operation command to each part of the heat source device 4 in response to an I / F (Inter Face) 52, an A / D conversion circuit 54, and a control command that take in detection values from various detection circuits. The driving device 56 includes an external remote controller 58 that performs hot water supply temperature setting and the like, and a transmission / reception circuit 60 that performs transmission / reception regarding operation commands with the power supply circuit 59.

  Detection signals from the incoming water temperature sensor 36, the outgoing water temperature sensor 38, the mixed temperature sensor 40, the heat medium input temperature sensor 18, the heat medium output temperature sensor 22, and the water amount sensor 34 installed in the heat source device 20 are taken from the I / F 52. And converted into a digital signal through the A / D conversion circuit 54 and then taken into the CPU 44. Then, various control programs are read from the ROM 48, and control processing such as hot water supply number calculation, heat medium flow rate calculation, differential pressure calculation, heat medium flow rate correction calculation and the like are executed using the detected values. An operation command is transmitted to etc. The calculated value or the like is recorded in the RAM 46 and can be used for the next control of the flow rate of the heat medium.

  Next, hot water supply heat medium control will be described with reference to FIG. FIG. 4 is a flowchart of hot water supply heat medium control.

  The hot water supply heat medium control of the heat source device 20 calculates the exchange heat amount between the heat medium 4 and the clean water W that is the fluid to be heated, calculates the differential pressure applied to the heat medium 4 on the circulation path 812, and sets the set temperature In order to change the inflow amount of the heat medium 4 so as to supply hot water, the opening degree of the heat medium control valve 24 is controlled as an adjustment amount of the flow rate adjusting means.

  In the hot water supply heat medium control, first, when a hot water supply demand occurs, the heat source device 20 is in a state where hot water can be supplied, for example, is not in an abnormally stopped state, is in an operation ON state, or is in a hot water supply stopped state due to abnormal hot water supply temperature. It is checked whether it is not (step S1). If hot water supply is possible (YES in step S1), it is checked whether the water amount sensor 34 has detected flowing water of the clean water W by opening the hot water tap (step S2).

When flowing water of the clean water W is detected (YES in step S2), the heat medium difference recorded in the ROM 48 according to the use state of the heat source device 20 (FIG. 7) by the differential pressure calculation at the start of hot water supply described later. Based on the calculated value of the pressure or a predetermined reference differential pressure (for example, 1 [kgf / cm ² ]), the heating medium flows so that a predetermined heat medium flow rate (for example, 20 [L / min]) flows. The control valve 24 is opened to start hot water supply, and the heat medium differential pressure is calculated (step S3). When the hot water supply is started, it is determined whether or not the running water of the clean water W has been detected again as a determination as to whether or not the hot water supply process has been completed (step S4).

  When flowing water of the clean water W is detected (YES in step S4), the required hot water supply number according to the set temperature on the hot water supply side is calculated, and the target hot water supply is obtained from the heat medium flow rate table corresponding to the required hot water supply number stored in the ROM 48. The heat medium flow rate is determined (step S5). In addition, the determination of the target heat medium flow rate may be performed by finely calculating the heat medium flow rate according to the required hot water supply number, in addition to having a table by dividing the necessary number calculated as described above into fixed values. .

  Here, an example of the table which shows the relationship between the required hot water supply number mentioned above and target heat-medium flow volume is shown.

  When the target hot water supply heat medium flow rate is determined, the target heat medium flow rate set at the current opening degree of the heat medium control valve 24 is compared with the target hot water supply heat medium flow rate calculated in step S5, and the target heat medium flow rate is determined. It is determined whether or not has been changed (step S6). As a result of the comparison, when the target heat medium flow rate is changed (YES in step S6), the heat medium control valve 24 is controlled by FF (feed forward) control in order to adjust the flow rate of the heat medium 4 flowing into the heat source device 20. The opening is changed (step S7). In the FF control, the opening degree of the heat medium control valve 24 is set using the differential pressure measured in step S3 and the target heat medium flow rate calculated in step S5. If the target heat medium flow rate is not changed (NO in step S6), the heat medium 4 is heated from the detected temperature of the heat medium 4 after heat exchange by the heat medium temperature sensor 22 by FB (feedback) control described later. The flow rate of the heat medium 4 is adjusted so that the flow rate of the inflowing heat medium 4 and the target heat medium flow rate coincide with each other according to the differential pressure fluctuation generated in the medium 4 or the change in hot water supply demand (step S8).

  When hot water supply is impossible (NO in step S1) or when running water W is not detected (NO in steps S2 and S4), the heat medium control valve 24 is closed (step S9).

  Next, a differential pressure calculation method will be described with reference to FIG. FIG. 5 is a flowchart of differential pressure calculation.

As described above, since the differential pressure of the heat medium 4 supplied to the heat source device 20 is not constant depending on the installation conditions and the like, the flow rate of the heat medium 4 varies even with the same valve opening. Therefore, a means for calculating the current differential pressure generated in the heat medium 4 will be described in order to control the flow rate of the heat medium 4 without installing a flow meter or a differential pressure meter or the like serving as a flow path resistance on the circulation path 812. First, the flow rate of the heat medium 4 currently flowing through the circulation path 812 is calculated (step S10). Specifically, the exchange heat quantity exchanged by heat exchange is determined from the flow rate of clean water W that is the fluid to be heated and the temperature of clean water W before and after heat exchange, and the flow rate of the heat medium 4 is calculated from the heat quantity. Next, the heat medium flow rate and valve opening calculation program 310 is read from the ROM 48 when the differential pressure of the heat medium 4 is the reference differential pressure, for example, 1 [kgf / cm ² ], and the currently set heat medium control valve 24 is set. From the opening, the flow rate of the heat medium 4 at the reference differential pressure is obtained (step S11). Then, the current differential pressure applied to the heat medium 4 is calculated by the differential pressure calculation program 320 using the flow rates obtained in steps S10 and S11 (step S12).

  Calculation of the current heat medium flow rate described in step S10 will be described with reference to FIG. FIG. 6 is a diagram showing the configuration of the heat exchanger 16. The same parts as those in FIG. 2 are denoted by the same reference numerals.

  The heat exchanger 16 is configured such that the circulation path 812 and the water pipe line 26 perform heat exchange inside the plate 62. In such a configuration, the current heat medium flow rate is determined assuming that the amount of heat on the heat medium side and the amount of heat received on the hot water supply side of the plate 62 are equal. Here, the current heat medium flow rate to be calculated is Rn [L / min], and the hot water supply flow rate on the heated side by the water amount sensor 34 is Rq [L / min] as a value detectable by each sensor. The hot water temperature by Tsth [° C.], the incoming water temperature by the incoming water temperature sensor 36 is Tqin [° C.], the incoming temperature of the heat medium by the heat medium inlet temperature sensor 18 is Tnin [° C.], and the outgoing temperature of the heat medium by the heat medium temperature sensor 22 Is Tnqo [° C.], the flow rate and temperature are stable in a steady state from the above conditions.

となる。この式(1) から現在の熱媒流Ｒｎを求めるように変形すると、 From the above conditions, the integrated value of the temperature and flow rate of the heating medium and the clean water W is

It becomes. From this equation (1), if the current heat transfer flow Rn is modified,

となり、現在、循環路８１２に流れている熱媒４の流量Ｒｎを算出することができる。

Thus, the flow rate Rn of the heat medium 4 currently flowing through the circulation path 812 can be calculated.

  Next, the current differential pressure calculation method in step S12 of FIG. 5 will be specifically described. Regarding the calculation of the differential pressure, a relational ratio between two different types of differential pressure and flow rate is obtained by using a steady Bernoulli equation that is a law of conservation of fluid energy. That is, from the steady Bernoulli equation,

となる。この式でρは密度、ｕは流速、ｇは重力加速度、ｈは測定場所の高さ、Ｕは熱エネルギー（比熱×温度）、Ｐは圧力である。式(3) の左辺について各項は、第１項が運動エネルギー、第２項が位置エネルギー、第３項が内部エネルギー、第４項が圧力を表している。この流量制御においては、同一場所における差圧と流量変化を算出することが目的であるので、式(3) の第２項の位置エネルギーは無視することができる。また外部からのエネルギーの加減はないので、第３項も無視することができる。

It becomes. In this equation, ρ is the density, u is the flow velocity, g is the acceleration of gravity, h is the height of the measurement location, U is the thermal energy (specific heat × temperature), and P is the pressure. Regarding the left side of Equation (3), the first term represents kinetic energy, the second term represents potential energy, the third term represents internal energy, and the fourth term represents pressure. The purpose of this flow rate control is to calculate the differential pressure and flow rate change at the same location, so the potential energy of the second term in equation (3) can be ignored. Since there is no external energy adjustment, the third term can be ignored.

及び、

が成り立つ。また式(4) を変形すると、 In this state, assuming that the atmosphere is P0, the flow velocity at the differential pressure P1 is u, and the flow velocity at the differential pressure P2 is v, for each differential pressure,

as well as,

Holds. Also, if equation (4) is transformed,

となり、式(5) を変形すると、

となる。流量及び圧力の比を取るために両辺をそれぞれ割ると、

And transforming equation (5),

It becomes. Dividing both sides to get the ratio of flow and pressure,

となり、従って、

となる。これを変形すると、

And therefore

It becomes. If this is transformed,

となることから、流速は差圧の比の平方根に比例することになる。

Therefore, the flow velocity is proportional to the square root of the differential pressure ratio.

となる。ここでｓは断面積である。同じ弁開度の条件において断面積は一定であることから、式(10)の両辺に断面積ｓをかけると、 The relationship between flow rate and flow velocity is

It becomes. Here, s is a cross-sectional area. Since the cross-sectional area is constant under the same valve opening conditions, if the cross-sectional area s is applied to both sides of Equation (10),

が成立する。予め差圧が１〔ｋｇｆ／ｃｍ² 〕での流量と弁開度のデータを測定して記録しておき、そのデータから流量Ｒとなる弁開度に設定した時に、実際に流れた流量がｒとすると、その設置場所の差圧ｐは式(12)より、

となるので、これを変形すると、

となる。ここでＲは目標熱媒流量、r は式(2) の被加熱流体側の流量等から求められる熱媒の流量Ｒn である。

Is established. The flow rate and valve opening data at a differential pressure of 1 [kgf / cm ² ] are measured and recorded in advance, and when the valve opening is set to the flow rate R from that data, If r, then the differential pressure p at the installation location is

So, if you transform this,

It becomes. Here, R is the target heat medium flow rate, and r is the heat medium flow rate Rn obtained from the flow rate on the heated fluid side in equation (2).

From the above, the differential pressure p at the installation location can be obtained, and the flow rate at each valve opening at the differential pressure p can be obtained from the equation (10). Since the flow rate control of the hot water supply heat medium is controlled by the opening degree of the valve body to be driven by, for example, a stepping motor or the like, the required heat medium flow rate is determined based on the calculated differential pressure, the opening degree, and the heat medium. Determine the flow rate. That is, from equations (13) and (14), if the flow rate R and the differential pressure at the reference differential pressure (for example, 1 [kgf / cm ² ]) are known, the flow rate r flowing at the same valve opening can be found. .

  Next, the differential pressure calculation at the start of hot water supply performed in step S3 of FIG. 4 will be described with reference to FIG. FIG. 7 is a flowchart of differential pressure calculation at the start of hot water supply.

First, when the power is turned on for the first time, the RAM 46 does not have information such as the differential pressure necessary for the heat medium flow rate control, so it is determined whether or not the power is turned on for the first time (step S13). When the power is turned on for the first time (YES in step S13), it is assumed that the differential pressure of the heating medium 4 is 1 [kgf / cm ² ] (step S14), and the heating medium control valve 24 is opened to perform a hot water supply operation. Is started (step S15). At the start of hot water supply, in order to improve the responsiveness of the hot water supply temperature, the opening degree of the heat medium control valve 24 is set to flow at a prescribed heat medium flow rate (for example, 20 [L / min]) instead of a flow rate according to the required number. Set to. As described above, the opening degree of the valve is controlled based on a program indicating the relationship between the heating medium flow rate and the opening degree of the heating medium control valve 24 when the reference differential pressure is 1 [kgf / cm ² ]. .

Then, from the heat medium flow rate with respect to the current valve opening when the differential pressure is 1 [kgf / cm ² ] and the current heat medium flow rate actually flowing calculated using the above equation (2), the equation Using (14), the current differential pressure is calculated and stored in the RAM 46 (step S16).

When the power is not turned on for the first time (NO in step S13), it is determined whether or not a predetermined time T (for example, 10 minutes) has elapsed since the end of the previous hot water supply (step S17). When the predetermined time T has elapsed since the end of the previous hot water supply (YES in step S17), the previously calculated differential pressure p stored in the RAM 46 is read out, and the prescribed heat medium flow rate (for example, 20 [L / Min]) is set so that the opening degree of the heat medium control valve 24 is set (step S18). Since the differential pressure p and the current heat medium flow rate r are known from the above-mentioned equation (13), the differential pressure is set to 1 [kgf / cm ² ] as the reference differential pressure. The flow rate R at this time is obtained, and the opening degree of the valve can be obtained from the flow rate R. After setting the opening degree of the heat medium control valve 24, the current differential pressure is calculated (step S16).

  When a predetermined time T (for example, 10 minutes) has not elapsed since the end of the previous hot water supply (NO in step S17), the differential pressure information calculated last time is used to reduce the loss of responsiveness to the hot water request, and the specified heat The heat medium control valve 24 is opened so that a medium flow rate (for example, 20 [L / min]) flows (step S19). In this case, the differential pressure is not calculated on the assumption that the change in the differential pressure state of the heat medium 4 is small.

(About FF control)

  The FF control in step S7 (FIG. 4) will be described. As described above, if the differential pressure of the supplied heat medium is different, the flow rate for a certain valve opening is different. Therefore, in order to determine the opening degree of the heat medium control valve 24 from the flow rate of the heat medium 4, it is necessary to obtain the current differential pressure. In step S7, the opening degree of the heat medium control valve 24 is changed when the target heat medium flow rate is changed by the determination in step S6. That is, in steps S15, S18, and S19 as described above, when hot water supply is started at a predetermined differential pressure (for example, a reference differential pressure or a previously measured differential pressure) at the start of hot water supply, or by changing the amount of hot water supply during hot water supply, etc. When the target heat medium flow rate is changed, the opening degree of the heat medium control valve 24 is changed by FF control.

In the FF control, control is performed using Equation (14) by the heat medium differential pressure calculated in step S16 and the target heat medium flow rate calculated in step S5. That is, the heat medium flow rate R at the reference differential pressure of 1 [kgf / cm ² ] is obtained by using the heat medium differential pressure calculated by p in Equation (14) and r as the target heat medium flow rate at the current differential pressure. it can. Then, the opening degree of the heat medium control valve 24 is controlled based on the heat medium flow rate and valve opening degree calculation program 310 stored in the ROM 48.

(About FB control)

  The FB control of the hot water supply heat medium flow rate in step S8 will be described with reference to FIG. FIG. 8 is a flowchart regarding FB control of the hot water supply heat medium flow rate.

  In the heat source device 20, the differential pressure fluctuates due to adjustment of the valve opening degree according to the target heat medium flow rate, fluctuation of the pumping force to the supplied heat medium 4, etc., and is set in step S3 or step S7. FB control is performed because the flow rate of the heating medium varies.

  In the FB control, the heat when flowing at the target heat medium flow rate using the amount of heat received by the clean water W by heat exchange, the target heat medium flow rate calculated in step S5, and the temperature of the heat medium 4 before heat exchange. The temperature after replacement is calculated as a target value, and the target value is compared with the temperature detected by the heat medium discharge temperature sensor 22 to control the flow rate of the heat medium. Therefore, first, the target value of the hot water supply heat medium discharge temperature, which is the temperature after heat exchange of the heat medium 4, is calculated from the equation (1) (step S 20). Specifically, by transforming equation (1),

とする。この式(15)より、熱交換による与熱量と受熱量が等しいとすれば、目標熱媒流量Ｒｘ、給湯流量Ｒｑ、熱媒入温度Ｔｎｉｎ、目標出湯温度Ｔｓｔｈ、入水温度Ｔｑｉｎは、一定である。なお、式(15)において、Ｒｑ×（Ｔｓｔｈ−Ｔｑｉｎ）の部分は、単位換算により給湯側の実号数を表す。

And From this equation (15), if the amount of heat applied and the amount of heat received by heat exchange are equal, the target heat medium flow rate Rx, the hot water supply flow rate Rq, the heat transfer temperature Tnin, the target hot water temperature Tsth, and the incoming water temperature Tqin are constant. . In Equation (15), the part of Rq × (Tsth−Tqin) represents the actual number of hot water supply side in terms of units.

  Then, a comparison is made as to whether or not the target value of the hot water supply heat medium output temperature calculated in step S20 matches the current hot water supply heat medium output temperature detected by the heat medium output temperature sensor 22 (step S21). When the current hot water supply heat medium discharge temperature is equal to the target value (YES in step S21), heat exchange is performed at the required heat medium flow rate. After calculating the differential pressure, the current differential pressure is calculated. The calculated value is stored in the RAM 46 (step S22), and the FB control is terminated.

  If the current hot water supply heat medium discharge temperature is different from the target value (NO in step S21), it is determined whether or not the current hot water supply heat medium discharge temperature is lower than the target value (step S23). When the medium discharge temperature is lower than the target value (YES in step S23), the difference between the entry temperature and the exit temperature of the heat medium is large and the flow rate of the heat medium 4 is small. In order to obtain the target heat medium flow rate, the heat medium control valve 24 is opened to increase the flow rate (step S24). Conversely, if the current hot water supply heat medium discharge temperature is higher than the target value (NO in step S23), the heat medium control valve 24 is closed to reduce the heat medium flow rate (step S25).

  In the FB control, the target heat medium discharge temperature Tnqo, which is the target value obtained from the equation (15), is set as a set value, the current hot water supply heat medium return temperature is a control variable, and the valve opening of the heat medium control valve 24 is an operation variable. PI (Proportion Integral) control. In addition, FB control is good also as a structure which complete | finishes when a deviation becomes a predetermined value other than the case where it carries out until the present hot water supply heat-medium discharge temperature and target value become equal.

  The above-described heat medium flow rate control will be described with reference to FIG. FIG. 9 is a block diagram of heat medium flow control.

  The heat medium flow rate control is performed by the computer of the control unit 42. First, the hot water supply number calculation processing 202 is performed based on the set hot water supply temperature 200 set by an external remote controller or the like, and the detected values of the water amount sensor 34 and the incoming water temperature sensor 36 as flow rate detection means. The target heat medium flow rate determining means 204 determines the target heat medium flow rate in step S5 (FIG. 4) according to the hot water supply number calculated here. In determining the heat medium flow rate, for example, the target heat medium flow rate determination table 206 of Table 1 stored in the ROM 48 or the like is used.

  In addition, the water amount sensor 34 performs a hot water supply start state determination 208 (for example, steps S13 and S17) in addition to the running water determination 207 of the clean water W in steps S2 and S4 (FIG. 4).

  The set flow rate of the heat medium 4 is set by the hot water supply condition switching means 209. The hot water supply condition switching means 209 switches between the heat medium flow rate determined by the target heat medium flow rate determination means 204 and the initial set flow rate 210 based on the result of the hot water supply start state determination process 208. That is, the target heat medium flow rate according to the hot water supply set temperature and the initial set flow rate 210 stored in the ROM 48 are switched according to the operating state of the heat source device 20 (for example, steps S13 and S17 in FIG. 7). And the opening degree calculation 212 of the heat medium control valve 24 according to the set heat medium flow volume is performed.

In the opening degree calculation process 212 of the heat medium control valve 24, the calculation is performed based on the differential pressure state generated in the heat medium 4. Therefore, for example, in accordance with the hot water supply start state determination processing 208 in steps S13 and S17 (FIG. 7), the differential pressure condition switching means 213 stores the differential pressure condition as 1 [kgf / cm ² ] 214 and the differential pressure memory such as the RAM 46. The opening degree is calculated by switching the differential pressure stored in the unit 216. In this case, for the valve opening, a reference table 218 such as a heat medium flow rate and valve opening calculation program 310 stored in the ROM 48 is used.

  Next, regarding the FB control of the heat medium flow rate, the actual hot water supply number calculation 222 is performed from the detected values of the incoming water temperature sensor 36, the mixed temperature sensor 40, and the water amount sensor 34. Then, a target value calculation process 224 for the hot water supply heat medium discharge temperature is performed based on the actual hot water supply number, the temperature detected by the heat medium inlet temperature sensor 18, the target heat medium flow rate, and the like. Then, the hot water supply heat medium output temperature determination means 226 and the heat medium output temperature sensor 22 based on the flow rate control program 300 and the like perform opening degree correction 228 of the heat medium control valve 24 and calculate 230 of the actual heat medium flow rate.

  From the hot water supply start state determination process 208 and the target heat medium flow rate determination process 204, the target heat medium flow rate change determination process 220 performed in step S6 (FIG. 4) is performed, and the flow rate control switching is performed based on the determination result. The means 231 switches between the heat medium control valve opening degree calculation 212 that is the FF control and the heat medium control valve opening degree correction 228 that is the FB control. Then, the valve adjustment switching means 233 switches whether to control the opening degree of the heat medium control valve 24. The valve adjustment switching means 233 switches between the switching control of the heat medium control valve 24 by the flow rate control switching means 231 and the control valve closing data 232 based on the stoppage of the flowing water of the fresh water W in accordance with the flowing water determination 207 of the fresh water W.

  Further, when the target heat medium flow rate is changed or the opening degree of the heat medium control valve is corrected, a differential pressure calculation process 234 is performed from the result of the actual heat medium flow rate calculation process 230 or the like. Then, whether or not to store the calculated differential pressure in the differential pressure storage unit 216 is determined by the differential pressure storage determination processing 235, and the differential pressure storage processing switching means 236 is switched based on the determination.

[Second Embodiment]

  Next, a heat source device according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a diagram illustrating the heat exchange system 2, and FIG. 11 is a diagram illustrating a configuration of the heat source device 20. 10 and 11, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

  In this embodiment, the heat medium 4 pumped from the heating unit 6 is used not only for hot water supply, but also for hot water supply to a bathtub, operation of the heating terminal 64 and memorization of the fully automatic bath device 66. It is. In addition, the heating terminal 64 is good also as a structure which uses a high temperature side for a bathroom heating dryer etc. as a structure divided into high temperature use and low temperature use, for example.

(Bath water supply function)

  In this heat source device 20, as a hot water supply function to the bathtub 68, a hot water supply path 70 for bathing the hot water HW from the water pipe 26 to the bathtub side is installed, and on the hot water supply path 70 for bath, A pouring control valve 71 that controls the amount of hot water supplied, a pouring amount sensor 72, and check valves 73 and 74 that prevent backflow to the water pipeline 26 are provided. The hot water supply to the bathtub 68 is configured such that when the bath hot water tap is opened, the hot water HW heated by the hot water supply is guided from the water pipe 26 to the hot water supply passage 70 for the bath, as in the first embodiment.

(Heating operation function)

  Heating of the heat source device 20 is performed by heating the heat exchanger 76, the heating circulation path 78 that leads the heating medium 4 to the heating heat exchanger 76, and the heating heat medium circulation that circulates the heating heat medium 80 to the heating terminal 64. The heating medium 80 includes a passage 82 and a tank 84 that stores the heating medium 80. A heating medium control valve 86 that controls the flow rate of the heating medium 4 and the temperature of the heating medium 4 after heat exchange are provided on the heating circulation path 78. A heat medium temperature sensor 87 for detecting the above is installed. Further, on the heating heat medium circulation path 82, a tank 84 for storing the heating heat medium 80 after heat exchange, a heating heat medium temperature sensor 88 for detecting the heat medium temperature after heat exchange, and the heating heat medium 80 are circulated. A pump 90, a low temperature going temperature sensor 92, and a low temperature adjusting valve 94 are installed. Further, the tank 84 is provided with a water supply path 96 for replenishing the heating heat medium 80, and a water supplement electromagnetic valve 98 for controlling the water supply flow rate is provided on the water supply path 96. The low-temperature adjusting valve 94 is installed on the heating heat medium circuit 82 that leads from the tank 84 to the heating terminal 64, and the heating heat medium 80 and the tank after heat exchange according to the temperature detected by the low-temperature forward temperature sensor 92. The heating medium 80 is mixed with the heating medium 80 to adjust the temperature.

  When the heating terminal 64 is put into an operating state, the pump 90 is activated and the heat medium control valve 86 is in an “open” state. Then, the opening degree of the heat medium control valve 86 is proportionally controlled based on the temperature detected by the heating heat medium discharge temperature sensor 88 with respect to the load from the heating terminal 64, and is controlled so as to maintain the set temperature of heating. In addition, when performing hot water supply and heating operation simultaneously, the following table | surface is shown as an example of the table which shows the required hot water supply number used for calculation of the target heat-medium flow volume of above-mentioned step S5 (FIG. 4), and target heat-medium flow volume. 2 may be used.

(Memorial function of fully automatic bath 66)

  As a bath remedy function of the heat source device 20, a part of the hot water supply passage for bath 70 is shared to constitute the remedy circulation path 100. The remedy circulation path 100 includes a bath return temperature sensor 102, a water level sensor 104, A switching valve 106, a pump running water switch 108, and a bath pump 110 are installed. The bath water exchanger 112 is provided with a bath heat exchanger 112 so as to exchange heat with the heating medium 80 flowing in the heating medium circulation path 82. The bath return temperature sensor 102 detects the temperature of the bath water BW flowing from the bathtub 68 into the memorial circuit 100, and the water level sensor 104 detects the water level in the bathtub 64. In addition, the switching valve 106 switches between memorial service and bathtub hot water supply.

  When the bath temperature is set, the bath pump 110 is started, the hot water BW in the bathtub 68 flows into the memorial circuit 100, and the pump flow switch 108 is turned on when the flow rate exceeds a certain level. Then, the pump 90 is started to circulate the heating heat medium 80, which is a heat medium for replenishment, to the bath heat exchanger 112, and the heating heat medium control valve 86 is set to the “open” state to add the bath water. It is the structure which performs a trap.

  In such a configuration, by performing the differential pressure calculation of the heat medium 4 and the heat medium flow rate control, as described in the first embodiment, the flow rate of the heat medium 4 is not measured and the fluid to be heated is measured. The heat medium flow rate can be optimized according to the heat demand. In addition, it is not necessary to adjust the heat source device for each condition such as installation location and usage status, and it is possible to supply a stable heat medium regardless of the usage status of other heat source devices sharing the heat medium. Become.

[Other Embodiments]

(1) In the above embodiment, in the FB control, when the differential pressure applied to the heat medium 4 is low, the set flow rate does not flow even when the opening degree of the heat medium control valve 24 is fully opened, and the FB control stop condition It may not be. Therefore, in such a case, if it is detected that the heat medium inlet temperature and the heat medium outlet temperature continue to be in a stable state for a predetermined time T2 (for example, 30 seconds), a differential pressure of 1 [kgf / The differential pressure may be calculated from the flow rate R in the fully open state of the heat medium control valve 24 of cm ² ] and the actual heat medium flow rate r.

  (2) As described in the above embodiment, it is possible to use a heating function while using hot water supply, recalculate the required number of hot water supply according to the use situation, etc., and switch the heat medium flow rate. Good. As a result, the heating medium 4 is not used unnecessarily, so that it is possible to save costs, save energy, and reduce the load on the heating unit.

  (3) In the calculation of the differential pressure at the start of hot water supply in the above embodiment, when the heat medium 4 is stable below a predetermined temperature, the calculated differential pressure becomes a very large value, and the usable heat medium flow rate is There is a risk of exceeding. Therefore, in such a case, the differential pressure calculation may not be performed at the start of hot water supply, and the differential pressure calculation may be performed when the heat medium flow rate becomes the target flow rate by the FB control.

(4) In the above embodiment, at the time of heating single operation, the heating heat medium flow rate and the heating valve opening degree control may be performed using the differential pressure measured at the time of using the previous hot water supply. The above control may be performed using a differential pressure calculated on the hot water supply side. Alternatively, the heating operation may be performed at 1 [kgf / cm ² ] until the differential pressure is measured after the power is turned on, after the power failure is restored, or after the error of the hot water supply heat medium valve is canceled.

  (5) In the above embodiment, the heating setting is set despite the valve opening at which the flow rate of the heat medium reaches the maximum due to the differential pressure during the previous hot water use stored in the RAM 46 during the heating independent operation. The temperature of the heating medium does not reach the heating temperature, and the heating heat discharge temperature does not reach the heating heat discharge temperature when the maximum flow rate in the single heating operation flows. Is determined to be stable for a predetermined time T3 (for example, 30 seconds), it is determined that the current differential pressure is lower than the differential pressure during the previous hot water supply use, and the heat medium control is performed. The opening degree of the valve 86 may be increased by a predetermined value (for example, + 5%) from the maximum heating medium flow rate opening degree during the single heating operation.

  (6) In the above embodiment, the target temperature of the heating forward temperature of the heating medium 80 after heat exchange flowing through the heating medium circulation path 82 is set as a set value, the actual measured temperature is a control variable, and the heating medium control valve A configuration may be employed in which the heating medium flow rate control is performed by performing FB control on the heating forward temperature with the heat medium flow rate using PI control using the valve opening of 86 as an operation variable.

  (7) In the above embodiment, when performing the heating control by the opening / closing control of the heat transfer valve, if the heating side is controlled with no load, when the valve reaches a certain valve opening degree, a vibration sound is generated in the valve. May occur. Therefore, the heat medium control valve 86 may be set to a predetermined minimum opening degree at which the vibration noise is not generated, and the ON / OFF control may be performed based on the minimum valve opening degree and the predetermined temperature of the heating medium 80 for heating. Good. That is, when the heating medium control valve 86 is set to the minimum opening, and when it is detected that the heating forward temperature is equal to or higher than a predetermined heating stop temperature for a predetermined time (for example, one minute), heating is performed. The heat medium control valve 86 is closed by turning it off. And when heating going-out temperature becomes less than the starting temperature of predetermined heating operation, it is good also as a structure which turns on heating and opens the heat-medium control valve 86 by the minimum opening degree. Further, when the heat medium control valve 86 is moved to the minimum opening, if the moving speed is a certain level or more, the squealing phenomenon due to vibration occurs as described above, and further the hunting phenomenon of the heating temperature is caused. There is a case. Therefore, in the closing operation of the heat medium control valve 86, the PI control proportional gain is reduced (for example, reduced to 1/3 of the original) when the minimum opening is less than a predetermined step (for example, +70 step), and the heat medium is In the opening operation of the control valve 86, the proportional gain may be returned to the original when the minimum opening is equal to or greater than a predetermined step (for example, +70 steps).

  (8) In the above embodiment, in the heat exchange between the heat medium 4 and the heating medium 80, the temperature of the heating medium 80 is higher than the temperature of the heat medium 4 even if 100% heat exchange is performed. Don't be. Therefore, when the temperature of the heat medium 4 is lower than the set temperature of the heating device, there is a possibility that the set temperature of the heating medium will not be reached even if the opening degree of the heat medium control valve 86 is adjusted. Further, during the heating independent operation, the control unit calculates the pressure difference of the heat medium 4 from the temperature of the heat medium 4 and increases the flow rate of the heat medium according to the pressure difference. Therefore, there is a risk that an excessive amount of the heat medium 4 will flow. Therefore, when the temperature of the heat medium 4 supplied to the heat source device 20 is lower than a predetermined specification temperature, the heating set temperature is set to a predetermined temperature (for example, − It is good also as a structure which can only be made to temperature only 5 degreeC low.

  (9) In the above embodiment, when the hot water supply function and the heating function are used at the same time, it may be configured to control the surplus flow rate on the hot water supply side to be distributed to the heating side.

  (10) In the above embodiment, in order to protect the power supply of the control base, the stepping motor used for the operation of the bypass mixing valve 32 and each heat medium control valve may be configured to limit the number of motors that can be operated simultaneously. Good. In this restriction, the bypass mixing valve 32 may be configured to always be operable in order to prioritize adjustment of the hot water supply temperature. Further, as in the above embodiment (9), when priority is given to the hot water supply operation, the heat medium control valve 24 may be operated with priority over the heat medium control valve 86. As an example of this configuration, during operation of the heat medium control valve 24, priority is given to the hot water supply side even if there is an operation command for the heat medium control valve 86. When a hot water supply command is input during the operation of the heat medium control valve 86, the operation of the heat medium control valve 86 is interrupted to operate the heat medium control valve 24, and after the operation of the heat medium control valve 24 is completed, the heat medium control valve 86. The operation may be resumed.

  (11) In the above embodiment, the origin detection process may be performed according to a predetermined condition to prevent the heat medium valve from sticking. This origin detection process maintains the differential pressure data.

As mentioned above, although the most preferable embodiment of this invention was described, this invention is not limited to said embodiment.

According to the present invention, it is possible to adjust the heat medium flow rate to the optimum heat medium flow rate according to the required heat amount on the heated fluid side without measuring the heat medium flow rate, making it unnecessary to adjust for each installation condition of the heat source device, There is no fluctuation of the hot water flow rate due to the differential pressure fluctuation, it is possible to realize an efficient and stable heat exchange, and it is useful as various heat source devices such as various hot water supply heat sources and heating heat sources.

It is a figure which shows the heat exchange system using the heat-source apparatus which concerns on 1st Embodiment. It is a figure which shows the structural example of a heat-source apparatus. It is a figure which shows the structural example of a control part. It is a flowchart of heat medium flow control. It is a flowchart of differential pressure calculation. It is the figure which showed the structural example of the heat exchanger. It is a flowchart of the differential pressure | voltage calculation at the time of a hot water supply start. It is a flowchart regarding FB control of the hot water supply heat medium flow rate. It is a block diagram of heat medium flow control. It is a figure which shows the heat exchange system using the heat-source apparatus which concerns on 2nd Embodiment. It is a figure which shows the structural example of the heat-source apparatus which concerns on 2nd Embodiment.

Explanation of symbols

6 Heating unit 8 Main circuit 16 Heat exchanger 18 Temperature sensor with heat medium (second temperature detection means)
20 heat source device 22 heat medium temperature sensor (second temperature detecting means)
24 Heat medium control valve (flow rate adjusting means)
26 Water pipe 34 Water volume sensor (Flow rate detection means)
36 Water temperature sensor (first temperature detecting means)
38 Hot water temperature sensor (first temperature detection means)
40 Mixed temperature sensor (first temperature detection means)
42 Control unit

Claims (9)

A heat source device that uses a supplied heat medium as a heat source,
Heat exchange means for exchanging heat between the heat medium and the fluid to be heated;
First temperature detecting means for detecting the temperature of the heated fluid;
Second temperature detecting means for detecting the temperature of the heat medium;
Flow rate detection means for detecting the flow rate of the heated fluid;
Flow rate adjusting means for adjusting the flow rate of the heat medium supplied to the heat exchange means;
A storage means for storing a heat medium flow rate at a reference differential pressure between an inlet side and an outlet side of the heat exchange means, and an adjustment amount of the flow rate adjusting means;
A detected flow rate of the heated fluid, a detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, a detected temperature of the heat medium before and after heat exchange by the second temperature detecting means, Based on the heat medium flow rate and the adjustment amount in the storage means, the adjustment amount of the flow rate adjustment means corresponding to the required heat amount of the fluid to be heated is obtained without measuring the flow rate of the heating medium, and this adjustment amount A control unit for controlling the flow rate adjusting means;
A heat source device comprising:
The heat source device according to claim 1,
The control unit includes a detected flow rate of the heated fluid, a detected temperature of the heated fluid before and after heat exchange by the first temperature detecting unit, and the heating medium before and after heat exchange by the second temperature detecting unit. The detected heat amount is used to obtain the exchange heat amount, the current heat medium flow rate is obtained from the exchange heat amount, the differential pressure of the heat medium corresponding to the reference differential pressure is obtained, and the differential pressure and the heated fluid A heat source device characterized in that a target heat medium flow rate is obtained from a required heat amount on the side, an adjustment amount of the flow rate adjusting means for the target heat medium flow rate is obtained, and the flow rate adjusting means is controlled to this adjustment amount.
The heat source device according to claim 1,
The detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, the detected flow rate of the heated fluid by the flow rate detecting means, and the heating medium before the heat exchange by the second temperature detecting means The target temperature of the heat medium after heat exchange is calculated from the detected temperature of the heat medium and the heat medium flow rate corresponding to the required heat amount of the fluid to be heated, and the target temperature of the heat medium and the heat by the first temperature detecting means The heat source device, wherein the adjustment amount of the flow rate adjusting means is controlled so that a temperature difference from the detected temperature of the heat medium after replacement is within a predetermined range.
A heat medium flow rate control method of a heat source device using a supplied heat medium as a heat source,
Heat exchange between the heat medium and the fluid to be heated by heat exchange means;
A process of detecting the temperature of the heated fluid by a first temperature detecting means;
A process of detecting the temperature of the heat medium by a second temperature detecting means;
Processing for detecting the flow rate of the heated fluid;
A process of adjusting the flow rate of the heat medium supplied to the heat exchange means by a flow rate adjusting means;
A heat medium flow rate at a reference differential pressure between the inlet side and the outlet side of the heat exchange means, a process of storing the adjustment amount of the flow rate adjustment means,
A detected flow rate of the heated fluid, a detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, a detected temperature of the heat medium before and after heat exchange by the second temperature detecting means, Based on the heat medium flow rate and the adjustment amount in the storage means, the adjustment amount of the flow rate adjustment means corresponding to the required heat amount of the fluid to be heated is obtained without measuring the flow rate of the heating medium. A process for controlling the flow rate adjusting means;
A heat medium flow rate control method for a heat source device, comprising:
In the heat-medium flow rate control method of the heat-source apparatus of Claim 4,
The control process includes: a detected flow rate of the heated fluid; a detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means; and the heating medium before and after heat exchange by the second temperature detecting means. The detected heat amount is used to obtain the exchange heat amount, the current heat medium flow rate is obtained from the exchange heat amount, the differential pressure of the heat medium corresponding to the reference differential pressure is obtained, and the differential pressure and the heated fluid The target heat medium flow rate is obtained from the required heat amount on the side, the adjustment amount of the flow rate adjusting means for the target heat medium flow rate is obtained, and the flow rate adjusting means is controlled to this adjustment amount. Flow rate control method.
In the heat-medium flow rate control method of the heat-source apparatus of Claim 4,
The detected temperature of the heated fluid before and after heat exchange by the first temperature detecting means, the detected flow rate of the heated fluid, the detected temperature of the heat medium before the heat exchange by the second temperature detecting means, The target temperature of the heat medium after heat exchange is calculated from the heat medium flow rate according to the required heat quantity of the fluid to be heated, and the heat temperature after heat exchange by the target temperature of the heat medium and the first temperature detection means. A heat medium flow rate control method for a heat source device, wherein an adjustment amount of the flow rate adjusting means is controlled so that a temperature difference with a detected temperature of the medium is within a predetermined range.
A heat medium flow rate control program for a heat source device, which is executed by a computer and exchanges heat between a supplied heat medium and a fluid to be heated by heat exchange means,
Capturing the temperature of the heated fluid;
Capturing the temperature of the heating medium;
Capturing the flow rate of the heated fluid;
Adjusting the flow rate of the heat medium supplied to the heat exchange means;
Storing a heat medium flow rate at a reference differential pressure between an inlet side and an outlet side of the heat exchange means, and an adjustment amount of the flow rate;
According to the detected flow rate of the heated fluid, the detected temperature of the heated fluid before and after heat exchange, the detected temperature of the heating medium before and after heat exchange, and the heat medium flow rate and the adjustment amount of the flow rate at a reference differential pressure Determining the flow rate adjustment amount corresponding to the required heat amount of the fluid to be heated without measuring the flow rate of the heating medium, and controlling the flow rate adjusting means to this adjustment amount;
A heat medium flow rate control program for a heat source device.
In the heat medium flow control program of the heat source device according to claim 7,
The control step obtains the exchange heat amount using the detected flow rate of the heated fluid, the detected temperature of the heated fluid before and after heat exchange, and the detected temperature of the heat medium before and after heat exchange, and from this exchange heat amount A current heat medium flow rate is obtained, a differential pressure of the heat medium corresponding to the reference differential pressure is obtained, a target heat medium flow rate is obtained from the differential pressure and a required heat amount on the heated fluid side, and the target heat flow is obtained. A heat medium flow rate control program for a heat source device, wherein an adjustment amount of the heat medium with respect to the medium flow rate is obtained and the flow rate of the heating medium is controlled to the adjustment amount.
In the heat medium flow control program of the heat source device according to claim 7,
Heat is detected from the detected temperature of the heated fluid before and after heat exchange, the detected flow rate of the heated fluid, the detected temperature of the heating medium before heat exchange, and the heating medium flow rate according to the required amount of heat of the heated fluid. Calculate the target temperature of the heat medium after replacement, and control the flow rate of the heat medium so that the temperature difference between the target temperature of the heat medium and the detected temperature of the heat medium after heat exchange is within a predetermined range A heat medium flow rate control program for a heat source device.

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