JP2007315748A - Freezing preventive operation method and heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent freezing of a heat medium on one standstill terminal side even when operating at least the other operating terminal for a long time. <P>SOLUTION: A heating system comprises: a heat medium circulating circuit constituted to selectively circulate the heat medium heated by a heat source machine, to a plurality of terminals; and an operation control means for carrying out freezing preventive operation control for preventing freezing of the heat medium in the heat medium circulating circuit by circulating the heat medium to the terminals. In a partial operating state of operating only the partial operating terminals out of the plurality of terminals, the operation control means starts freezing preventive operation control when the operating state turns into a freezing expected state of expecting freezing of the heat medium on the standstill terminal side other than the operating terminals, and stops the circulation of the heat medium to the operating terminal side during the execution of the freezing preventive operation control in the partial operating state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a heat medium circulation circuit configured to selectively circulate a heat medium heated by a heat source device to a plurality of terminal devices, and the heat medium to circulate the heat medium to the terminal devices. TECHNICAL FIELD The present invention relates to a heating system including an operation control unit capable of performing freeze prevention operation control for preventing freezing of the heat medium in the medium circulation circuit, and a freeze prevention operation method in the heating system, for example, a heat source in the heat medium circulation circuit The freeze prevention operation control for circulating hot water to a plurality of terminal devices is started when the temperature of the heat source side heat medium in the machine is below a certain temperature, and the freezing is performed when the heat source side heat medium temperature in the heat medium circulation circuit is above a certain temperature. The present invention relates to a freeze preventive operation method for ending preventive operation control.

  In the above heating system such as a hot water circulation type central heating system, when all terminal devices are in a stopped state, in the heat source machine and terminal devices (floor heater, bathroom heating dryer) and terminals In order to prevent freezing of the heat medium consisting of water in the pipes leading up to the equipment, the heat source side heat medium temperature in the heat source machine and the heat source side atmosphere temperature in the heat source machine are monitored, and the heat source side heat medium temperature or the heat source machine side atmosphere is monitored. When the temperature became below a certain temperature, all the on-off valves were opened, and heating of the heat medium by the burner and circulation of the heat medium by the circulation pump were started, and all terminals were heated. Freezing is prevented by circulating a heat medium (see, for example, Patent Documents 1, 2, and 3).

  That is, in the heating system described in Patent Document 1, a temperature sensor is provided in the vicinity of a heat source unit that heats the heat medium, the temperature sensor detects a heat source side ambient temperature that changes due to the operation of the heat source unit, and the heat source side ambient temperature When the temperature becomes below a certain temperature, the heat source device is operated to circulate the heated heat medium in the heat medium circuit, thereby preventing freezing.

  In addition, in the heating systems described in Patent Documents 2 and 3, when all the terminal devices are in a stopped state and the outside air temperature is equal to or lower than a certain temperature, the heating medium to all the terminal devices is used. In order to prevent freezing of the heat medium by circulating the heat medium, and further, when the temperature of the circulating heat medium is below a certain temperature, it is not possible to prevent freezing by simply circulating the heat medium. Is operated, and the heated heat medium is circulated to prevent the heat medium from freezing.

  Also, in a hot water and heating system having a hot water supply passage for heating hot water to generate hot water and supplying the hot water to a hot water tap etc., the water temperature and the heat source side ambient temperature are monitored, and the temperature is below a certain temperature. When this happens, there is a case where operation of a freeze prevention heater provided on the hot water supply path side is started to prevent freezing of hot water in the hot water supply path.

Japanese Patent Laid-Open No. 9-318085 Japanese Patent Laid-Open No. 10-9593 Japanese Patent Laid-Open No. 10-9594

  In such a heating system, when at least one terminal device is being operated, an open / close valve that opens and closes a branch pipe to the terminal device for a stopped terminal device other than the operating terminal device that is operating Is closed, and the heat medium does not circulate in the piping from the on-off valve to the terminal device and in the terminal device. That is, when at least one operation terminal device is operated for a long time, the heat medium on the stop terminal device side freezes, and there is a possibility that problems such as the heat medium not circulating during the next operation may occur.

  However, in the heating system described in Patent Document 1, it is determined whether or not the freeze-prevention operation control is performed based on the heat-source-side ambient temperature that changes due to the operation of the heat-source unit, and thus at least one terminal device is operated. In such a case, since the heat source device operates and the heat source side ambient temperature rises, the freeze prevention operation control is not executed, and the heat medium on the stop terminal device side may be frozen.

Further, even in the heating system described in Patent Document 2 or 3 described above, whether or not the freeze prevention operation control is performed based on the outside air temperature and the heat medium temperature when all the terminal devices are in a stopped state. Therefore, when at least one operation terminal device is operated, there is a possibility that the heat medium on the stop terminal device side is frozen.
Further, in this heating system, the outside air temperature is monitored, but even if the outside air temperature is low, the heat source machine may not be operated until the heat medium temperature in the heat medium circulation circuit is lowered. Furthermore, as the heat medium temperature, since the heat source side heat medium temperature before branching to all terminal devices, or the heat source side heat medium temperature after returning from all terminal devices and joining, is monitored. When at least one operation terminal device is in operation, the temperature of the heat medium does not decrease, and thus the freeze prevention operation control is not executed. Therefore, the heat medium on the stop terminal device side may be frozen.

  The present invention has been made in view of the above problems, and its purpose is to prevent the heat medium on the other stop terminal device side from freezing even when at least one operation terminal device is operated for a long time. The object is to provide a freeze-preventing operation method and a heating system.

The first characteristic configuration of the freeze prevention operation method according to the present invention for achieving the above object is a heat medium circulation configured to be able to selectively circulate a heat medium heated by a heat source device to a plurality of terminal devices. In a heating system comprising a circuit and operation control means capable of performing freeze prevention operation control for preventing the freezing of the heat medium in the heat medium circulation circuit by circulating the heat medium to the terminal device,
In the case where the operation control means is in a partial operation state in which only some of the plurality of terminal devices are operated, the heat medium on the stop terminal device side other than the operation terminal devices is frozen. The freeze prevention operation control is started when the predicted freeze prediction state is reached, and the freeze prevention operation control is terminated when the execution time from the start point of the freeze prevention operation control reaches the set execution time. There is in point to do.

  According to the first characteristic configuration of the freeze prevention operation method, when it is determined that the terminal device is in the partial operation state from the operation state (for example, ON / OFF state) of each terminal device, the heat medium on the stop terminal device side freezes. The start of the freeze prevention operation control can be determined depending on whether or not a possible freeze prediction state has been reached. That is, in the case of a partial operation state in which some operation terminal devices (floor heaters, etc.) are operated for a long time, for example, even if the heat source side heat medium temperature in the heat medium circulation circuit does not decrease, When the temperature of the heat medium on the stopped terminal device side decreases, freezing prevention operation control for the terminal device can be started, so that the heat medium on the stopped terminal device side other than the operating terminal device during heating operation is prevented from freezing. can do.

  Further, in the partial operation state, the freeze prevention operation control is executed for the set execution time, that is, by determining the end of the freeze prevention operation control at the elapsed time from the start time, the energy (gas, Waste of electricity) can be suppressed.

  According to a second characteristic configuration of the freeze prevention operation method according to the present invention, in addition to the first characteristic configuration of the freeze prevention operation method, the operation control means sets the set execution time as an outside air temperature or a feed water temperature. The point is to set according to the temperature.

  According to the second characteristic configuration of the anti-freezing operation method, the lower the freezing index temperature, which is the outside air temperature or the feed water temperature, freezes the set execution time longer, particularly when the freezing index temperature is extremely low. Preventive operation control can be executed for a long time to optimize the frequency of freeze prevention. Therefore, it is possible to reliably perform the freeze prevention operation control while reducing the required energy consumption.

  According to a third feature configuration of the freeze prevention operation method according to the present invention, in addition to the first or second feature configuration of the freeze prevention operation method, when the operation control means is in the partial operation state, When the freezing index temperature, which is the feed water temperature, becomes equal to or lower than the set freezing index temperature, the freeze prevention operation control is started assuming that the freezing prediction state is reached.

When the ambient temperature itself that can be detected as the ambient temperature inside or outside the heat source unit, or the feed water temperature that changes according to the ambient temperature, is the partial operating state in which the heated heat medium is circulated to the operating terminal equipment side However, it changes according to the outside air temperature that affects the freezing of the heat medium on the stop terminal device side. Therefore, according to the third characteristic configuration of the anti-freezing operation method, whether the heat medium on the stopped terminal device side is likely to freeze by using the outside air temperature or the feed water temperature as the freezing index temperature. It is possible to accurately determine whether or not to start the freeze prevention operation control.
Moreover, even if the freeze prevention operation control is started in the partial operation state and the heat medium temperature on the stop terminal device side rises, the outside air temperature itself or the freezing index temperature that is the feed water temperature that changes according to the outside air temperature does not rise. . Therefore, in such a case, it is particularly effective to execute the freeze prevention operation control for the set execution time in the partial operation state, that is, to determine the end of the freeze prevention operation control based on the elapsed time from the start time. It is.

  In addition to any one of the first to third feature configurations of the freeze prevention operation method, the fourth feature configuration of the freeze prevention operation method according to the present invention is that the operation control means includes all of the plurality of terminal devices. When the heat source side heat medium temperature in the heat source apparatus is equal to or lower than the first set heat source side heat medium temperature in the all stopped state, the freeze prevention operation control is started and the heat source side heat is The freeze prevention operation control is ended when the medium temperature becomes equal to or higher than the second set heat source side heat medium temperature.

  When it is determined that the terminal device is in a fully stopped state from the operating state of each terminal device, the heat source side heat medium temperature in the heat medium circulation circuit changes according to the outside air temperature. Therefore, according to the fourth characteristic configuration of the anti-freezing operation method, in the case of the total stop state, after the heat source side heat medium temperature becomes equal to or lower than the first set heat source side heat medium temperature set in advance. By performing the freeze prevention operation control until the temperature becomes equal to or higher than the set second set heat source side heat medium temperature, the heat medium can be reliably prevented from freezing.

  The fifth feature configuration of the freeze prevention operation method according to the present invention includes, in addition to any one of the first to fourth feature configurations of the freeze prevention operation method, when the operation control means is in the partial operation state. Further, the execution of the freeze prevention operation control is prohibited until the waiting time from the end of the freeze prevention operation control reaches the set waiting time.

  According to the fifth characteristic configuration of the anti-freezing operation method, means for counting the waiting time from the end of the anti-freezing operation control is provided, and when the partial operation state is also at the end of the anti-freezing operation control, it is counted. Until the standby time reaches the preset standby time, it is prohibited to execute the freeze prevention operation control again, and an appropriate interval is provided until the next freeze prevention operation control. It is possible to reduce the frequency of control and reduce the consumption of energy (gas, electricity, etc.) necessary for freezing prevention.

  In addition to the fifth feature configuration of the freeze prevention operation method, the sixth feature configuration of the freeze prevention operation method according to the present invention is a freeze index in which the operation control means sets the set standby time as an outside air temperature or a feed water temperature. The point is to set according to the temperature.

  According to the sixth characteristic configuration of the anti-freezing operation method, the lower the freezing index temperature, which is the outside air temperature or the feed water temperature, especially when the freezing index temperature is extremely low, etc., from the end of the freezing prevention operation control. It is possible to optimize the frequency of freeze prevention by setting the set standby time in which execution of the freeze prevention operation control is prohibited with respect to the elapsed time to be short to shorten the freeze prevention operation control interval. Therefore, it is possible to reliably perform the freeze prevention operation control while reducing the required energy consumption.

  In addition to any one of the first to sixth feature configurations of the freeze prevention operation method, the seventh feature configuration of the freeze prevention operation method according to the present invention is the case where the operation control means is in the partial operation state. Further, the execution of the freeze prevention operation control is prohibited until the continuation time of the freeze prediction state reaches the set continuation time.

  According to the seventh characteristic configuration of the anti-freezing operation method, means for counting the duration of the predicted freezing state in which the freezing index temperature, which is the outside air temperature or the feed water temperature, is equal to or lower than the set freezing index temperature, and the like are provided. In some cases, when the counted duration time reaches a preset set duration time, it is determined that it is in the freeze prediction state and freeze prevention operation control is started, so that the stop terminal after the freezing index temperature is lowered Considering the time until the heat medium on the equipment side freezes, delaying the start of freeze prevention operation control reduces the frequency of performing freeze prevention operation control, and consumes energy (gas, electricity, etc.) necessary for freeze prevention. The amount can be reduced.

  In addition to the seventh feature configuration of the freeze prevention operation method, the eighth feature configuration of the freeze prevention operation method according to the present invention is a freeze index in which the operation control means sets the set duration time to an outside air temperature or a water supply temperature. The point is to set according to the temperature.

  According to the eighth characteristic configuration of the freeze prevention operation method, the lower the freezing index temperature that is the outside air temperature or the feed water temperature, the freezing that is the outside air temperature or the feed water temperature, particularly when the freezing index temperature is extremely low. Prohibition of execution of anti-freezing operation control for the duration of the predicted freezing state where the index temperature is below the set freezing index temperature is set to a short setting duration and the freezing index temperature is continuously below the set freezing index temperature. Freezing prevention operation control can be started as soon as possible to optimize the frequency of freezing prevention. Therefore, it is possible to reliably perform the freeze prevention operation control while reducing the required energy consumption.

  In the ninth feature configuration of the freeze prevention operation method according to the present invention, in addition to any one of the first to eighth feature configurations of the freeze prevention operation method, the operation control means is in the partial operation state. The freeze prevention operation control is terminated when the terminal side heat medium temperature in the stop terminal device becomes equal to or higher than the set terminal side heat medium temperature.

  According to the ninth characteristic configuration of the anti-freezing operation method, when each terminal device side is provided with means for individually detecting the heat medium temperature supplied to the terminal device as the terminal side heat medium temperature, When the freeze prevention operation control is executed in the partial operation state, the terminal side heat medium temperature rises by performing the freeze prevention operation control. Therefore, the terminal side heat medium temperature in the stop terminal device is previously set. By determining the end of freeze prevention operation control based on whether or not the set terminal side heat medium temperature is higher than the set terminal side heat medium temperature, the freeze prevention operation control is appropriately performed according to the rising state of the terminal side heat medium temperature in the stopped terminal device. Thus, the execution time of the freeze prevention operation control can be minimized.

  The tenth feature configuration of the freeze prevention operation method according to the present invention is the case where, in addition to any one of the first to ninth feature configurations of the freeze prevention operation method, the operation control means is in the partial operation state. The heat medium temperature to be circulated during the execution of the freeze prevention operation control is set to be lower than the heat medium temperature required by the operation terminal device.

  According to the tenth characteristic configuration of the anti-freezing operation method, when the anti-freezing operation control is executed in the partial operation state, the operation terminal device needs in normal operation by adjusting the heating output of the heat source device. By circulating the heat medium having a temperature lower than the heat medium temperature, it is possible to minimize the temperature increase of the heat medium on the stop terminal device side where the heat medium is circulated only to prevent freezing.

  The eleventh characteristic configuration of the freeze-preventing operation method according to the present invention is that, in addition to any one of the first to tenth characteristic configurations of the freeze-preventing operation method, the operation control means is in the partial operation state. The circulation of the heat medium to the operation terminal device side is stopped during the execution of the freeze prevention operation control.

  According to the eleventh characteristic configuration of the anti-freezing operation method, when the anti-freezing operation control is executed in the partial operation state, the on-off valve capable of intermittently circulating the heat medium to the operation terminal device side is closed. Even if the temperature of the heat medium decreases by executing freeze prevention operation control by stopping the circulation of the heat medium to the operation terminal device side, the decrease in the temperature of the heat medium on the operation terminal device side is minimized. Can be suppressed. Furthermore, when the freeze prevention operation control is executed in the partial operation state, the heating medium circulating through the operation terminal device until immediately before is relatively high temperature, so the heating of the heating medium by the heat source unit is stopped. Then, circulating the relatively high-temperature heat medium only to the stop terminal equipment side, while minimizing the temperature rise of the heat medium on the stop terminal equipment side where the heat medium is circulated only to prevent freezing, Freezing of the heat medium on the stop terminal device side can be prevented.

A first characteristic configuration of a heating system according to the present invention for achieving the above object is a heating medium circulation circuit configured to selectively circulate a heating medium heated by a heat source unit to a plurality of terminal devices. A heating system comprising operation control means capable of performing freeze prevention operation control for preventing the freezing of the heating medium in the heating medium circulation circuit by circulating the heating medium to the terminal device,
In the case where the operation control means is in a partial operation state in which only some of the plurality of terminal devices are operated, the heat medium on the stop terminal device side other than the operation terminal devices is frozen. The anti-freezing operation control is executed when the predicted freeze prediction state is reached.

  According to the 1st characteristic structure of the said heating system, when it is judged that it is a partial driving | running state from the driving | running state (for example, ON / OFF state) of each terminal device etc., the heat medium by the side of a stop terminal device may freeze The start of the freeze prevention operation control can be determined depending on whether or not a certain freeze prediction state has been reached. That is, in the case of a partial operation state in which some operation terminal devices (floor heaters, etc.) are operated for a long time, for example, even if the heat source side heat medium temperature in the heat medium circulation circuit does not decrease, When the temperature of the heat medium on the stopped terminal device side decreases, freezing prevention operation control for the terminal device can be started, so that the heat medium on the stopped terminal device side other than the operating terminal device during heating operation is prevented from freezing. can do.

The second characteristic configuration of the heating system according to the present invention includes, in addition to the first characteristic configuration of the heating system, a freezing index temperature detecting unit that detects a freezing index temperature that changes according to the outside air temperature,
In the case where the operation control unit is in the partial operation state, when the freezing index temperature detected by the freezing index temperature detection unit is equal to or lower than a set freezing index temperature, The anti-freezing operation control is configured to be executed.

According to the 2nd characteristic structure of the said heating system, even when it is the partial driving | running state in which the heat medium heated to the operation terminal equipment side is circulated, the external temperature which influences freezing of the heat medium by the stop terminal equipment side The start of the freeze prevention operation control can be determined based on whether or not the freezing index temperature that changes in accordance with the freezing index temperature is equal to or lower than the set freezing index temperature.
Whether or not the freeze prevention operation control is started can be determined based on whether or not the freezing index temperature that changes according to the outside air temperature is equal to or lower than the set freezing index temperature.

  A third characteristic configuration of the heating system according to the present invention is a unit that, in addition to the second characteristic configuration of the heating system, the freezing index temperature detecting means detects an outside air temperature or a water supply temperature as the freezing index temperature. In the point.

  When the ambient temperature itself that can be detected as the ambient temperature inside or outside the heat source unit, or the feed water temperature that changes according to the ambient temperature, is the partial operating state in which the heated heat medium is circulated to the operating terminal equipment side However, it changes according to the outside air temperature that affects the freezing of the heat medium on the stop terminal device side. Therefore, according to the 3rd characteristic structure of the said heating system, it is a freezing prediction state by which the heat medium by the side of a stop terminal apparatus may freeze by using outside temperature or feed water temperature as a freezing index temperature. Can be determined accurately to determine the start of the freeze prevention operation control.

The fourth characteristic configuration of the heating system according to the present invention includes, in addition to any one of the first to third characteristic configurations of the heating system, a heat source side heat medium temperature detection for detecting a heat source side heat medium temperature in the heat source unit. With means,
When the operation control means is in a fully stopped state where all of the plurality of terminal devices are stopped, the heat source side heat medium temperature detected by the heat source side heat medium temperature detecting means is a first set heat source side heat. The freeze prevention operation control is started when the temperature becomes lower than the medium temperature, and the second heat source side heat medium temperature detected by the heat source side heat medium temperature detecting means is higher than the first set heat source side heat medium temperature. The anti-freezing operation control is configured to end when the set heat source side heat medium temperature is reached.

  When it is determined that the terminal device is in a fully stopped state from the operating state of each terminal device, the heat source side heat medium temperature in the heat medium circuit is changed according to the outside air temperature. So, according to the 4th characteristic structure of the said heating system, when it is all the stop states, after the heat source side heat-medium temperature becomes below the preset 1st setting heat-source side heat-medium temperature, the 1st By performing the freeze prevention operation control until the temperature becomes equal to or higher than the second set heat source side heat medium temperature set higher than the first set heat source side heat medium temperature, the heat medium can be reliably prevented from freezing.

  According to a fifth characteristic configuration of the heating system according to the present invention, in addition to any one of the first to fourth characteristic configurations of the heating system, the freeze prevention is performed when the operation control means is in the partial operation state. The freeze prevention operation control is configured to end when the execution time from the start point of the operation control reaches the set execution time.

  Even if the freeze prevention operation control is started in the partial operation state and the heat medium temperature on the stop terminal device side rises, the outside air temperature itself or the freezing index temperature that is the feed water temperature that changes according to the outside air temperature does not rise. Therefore, according to the fifth characteristic configuration of the heating system, in the partial operation state, the freeze prevention operation control is executed for the set execution time, that is, the end of the freeze prevention operation control is determined by the elapsed time from the start time. Thus, waste of energy (gas, electricity, etc.) necessary for freezing prevention can be suppressed.

  In addition to the characteristic configuration of the heating system described so far, the heating system according to the present invention is in a standby state from the end of the freeze prevention operation control when the operation control means is in the partial operation state. Until the time reaches the set standby time, it is configured to prohibit the execution of the anti-freezing operation control, and the same effect as the fifth characteristic configuration of the anti-freezing method described above is exhibited. Can do.

  In addition to the characteristic configuration of the heating system described so far, the heating system according to the present invention is a duration time during which the operation control unit is continuously in the frozen prediction state when the operation control unit is in the partial operation state. Until the set duration is reached, the execution of the anti-freezing operation control is prohibited, so that the same effect as the seventh characteristic configuration of the anti-freezing method described above can be exhibited. it can.

  In addition to the characteristic configuration of the heating system described so far, the heating system according to the present invention is a freezing index in which the operation control means indicates the set standby time or the set duration time as an outside air temperature or a feed water temperature. By being configured to be set according to the temperature, it is possible to exhibit the same operational effects as the sixth or eighth characteristic configuration of the freeze prevention method described above.

  Moreover, the heating system according to the present invention includes terminal side heat medium temperature detecting means for detecting the terminal side heat medium temperature in the stop terminal device in addition to the characteristic configuration of the heating system described so far, and the operation When the control means is in the partial operation state, the freeze prevention operation control is terminated when the terminal-side heat medium temperature detected by the terminal-side heat medium temperature detection means becomes equal to or higher than the set terminal-side heat medium temperature. By being comprised so, the effect similar to the 9th characteristic structure of the above-mentioned freeze prevention method can be exhibited.

  Further, the heating system according to the present invention, in addition to the characteristic configuration of the heating system described so far, is the heat circulated during execution of the freeze prevention operation control when the operation control means is in the partial operation state. By configuring the medium temperature to be lower than the heat medium temperature required by the operation terminal device, the same operational effects as those of the tenth characteristic configuration of the freeze prevention method described above can be exhibited.

  Further, the heating system according to the present invention, in addition to the characteristic configuration of the heating system described so far, when the operation control means is in the partial operation state, the operation is performed during the execution of the freeze prevention operation control. By being configured to stop the circulation of the heat medium to the terminal device side, it is possible to exhibit the same operational effects as the eleventh characteristic configuration of the freeze prevention method described above.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the heating system is a heating medium circulation circuit for selectively circulating a heating medium such as hot water or the like to a plurality of heating terminal devices 30 such as a floor heating device and a bathroom heating / drying device. 2, a hot water supply path 3 for supplying hot water to a water faucet, the heat source circulating the heat medium circulating circuit 2 and the heat source apparatus 1 for heating the hot water supplied in the hot water supply path, the heat source apparatus 1 and the terminal equipment 30 An operation control unit 4 (an example of an operation control means) composed of a computer for controlling the operation of the remote controller 5 and the like, a remote controller 5 corresponding to each terminal device 30 for starting / stopping each terminal device 30 and performing various settings. It is configured as a hot water supply / heating system.

  In the present embodiment, the terminal device 30 includes two devices, a terminal device 30a and a terminal device 30b, and the remote controller 5 includes a remote controller 5a corresponding to the terminal device 30a and a remote controller 5b corresponding to the terminal device 30b. It consists of two.

  The heating medium circulation circuit 2 converts the heating medium heated by the circulation pump 17 by heat exchange with the combustion gas of the heating burner 5 in the heating heat exchanger 10 in the heat source unit 1 into the heating heat exchanger 10. The return pipe 8, the forward header 12, the on-off valve 13, the forward branch pipe 18, the terminal device 30, the return branch pipe 19, the return header 14, and the return pipe 9 are circulated in this order. An expansion tank 16 and a circulation pump 17 are disposed in the return pipe 9.

  Further, the forward branch pipe 18 and the return branch pipe 19 are individually provided for each of the plurality of terminal devices 30, and each forward branch pipe 18 has an on-off valve 13 capable of intermittently circulating the heat medium. Is provided. Therefore, the heat medium circulation circuit 2 opens the on-off valve 13 provided on one or a plurality of terminal devices 30 selected from the plurality of terminal devices 30 and circulates the heat medium only to the terminal devices 30. In other words, the heat medium can be selectively circulated to the plurality of terminal devices 30.

The forward thermistor 11 is provided in the forward pipe 8 in the heat source unit 1, and the forward thermistor 11 is connected to the temperature of the forward heat medium (hereinafter referred to as “the forward heat medium” supplied from the heating heat exchanger 10 to the terminal device 30). This is called the forward heat medium temperature.
The return thermistor 15 is provided in the return pipe 9 in the heat source unit 1, and the return thermistor 15 is provided with the temperature of the return heat medium (hereinafter, referred to as “heat return”) supplied from each terminal device 30 to the heating heat exchanger 10. This is called return heat medium temperature.
The detection results of the thermistors 11 and 15 are input to the operation control unit 4.

  Further, each forward branch pipe 18 is provided with a terminal-side thermistor 31 that detects a terminal-side heat medium temperature supplied to each terminal device 30, and the detection result is also input to the operation control unit 4.

  In the heating burner 5, fuel gas such as city gas is supplied through a shutoff valve 27 that can cut off the supply of fuel gas and an adjustment valve 28 that can adjust the supply amount of the fuel gas, and combustion air is supplied to the fan 29. And is configured to burn an air-fuel mixture of the fuel gas and combustion air. Therefore, in the heating heat exchanger 10, the heat medium circulating in the heat medium circulation circuit 2 is heated by heat exchange with the combustion gas discharged from the heating burner 5.

  When the operation control unit 4 operates at least one terminal device 30, the operation terminal device 30 operates the circulation pump 17 and opens the on-off valve 13 on the side of the operation terminal device 30 to be operated. While circulating the heat medium to the side, the adjustment valve 28 is operated to adjust the amount of combustion of the heating burner 5, and the temperature of the forward heat medium detected by the forward thermistor 11 is set during operation required by the terminal device 30. The heating medium temperature is maintained.

  The hot water supply passage 3 is configured to supply hot water heated by heat exchange with the combustion gas of the hot water supply burner 6 in the hot water supply heat exchanger 20 in the heat source unit 1 to a water tap or the like. The hot water supply path 3 is provided with a water supply thermistor 21 that detects the temperature of the water supply before being supplied to the hot water supply heat exchanger 20, and the detection result is input to the operation control unit 4.

  Similarly to the heating burner 5, the hot water supply burner 6 is also supplied with a fuel gas such as city gas through the shutoff valve 32 that can shut off the supply of the fuel gas and the adjustment valve 33 that can adjust the supply amount of the fuel gas. At the same time, the combustion air is supplied from the fan 34 and the mixture of the fuel gas and the combustion air is combusted. Therefore, in the hot water supply heat exchanger 20, the hot water supplied through the hot water supply passage 3 is heated and supplied as hot water by heat exchange with the combustion gas discharged from the hot water supply burner 6.

  When the hot water supply to the water tap is started, the operation control unit 4 adjusts the adjustment valve 28 so that the hot water detected by the water supply thermistor 21 is maintained at the set hot water temperature set by the remote controller 7 or the like. Is configured to adjust the combustion amount of the hot water supply burner 6 and supply hot water having the set hot water supply temperature to the hot water tap.

  An outside air temperature thermistor 25 that detects the ambient temperature in the heat source machine 1 as an outside air temperature is provided in the heat source machine 1, and the detection result is input to the operation control unit 4.

  Further, in the heat medium circulation circuit 2, a plurality of terminal devices 30 such as a floor heater and a bathroom heater / dryer are connected, and the operation control unit 4 operates even when the at least one terminal device 30 is operated for a long time. In order to prevent the heat medium on the other terminal device 30 side from freezing, the freeze prevention operation method as shown in FIG. 3 is configured to be continuously repeated.

  That is, when the operation control unit 4 performs the freeze prevention operation method, first, the operation state (ON / OFF) of each terminal device 30 that can be recognized from the signal from each remote controller 7 or the state of each on-off valve 13, the outgoing The forward heat medium temperature detected by the thermistor 11, the return heat medium temperature detected by the return thermistor, the terminal side heat medium temperature detected by the terminal thermistor 31, the feed water temperature detected by the feed water thermistor 21, and the outside air temperature thermistor 25 Among the outside air temperatures detected in step 1, the state necessary for the subsequent processing is detected (step # 1).

  Next, the operation control unit 4 refers to the operation state of each terminal device 30, the operation state of the heat source unit 1, the open / close state of the on-off valve 13, etc. Partial operation state in which only some operation terminal devices of the device 30 are operated, total stop state in which all of the plurality of terminal devices 30 are stopped, or all operation in which all of the plurality of terminal devices are operated It is determined which of the states (step # 2). And when it determines with it being the said partial operation state, the partial operation state freezing prevention operation process mentioned later is performed (step # 100), and when it determines with the said all stop state, all the stop mentioned later State freeze prevention operation processing is executed (step # 200), and when it is determined that the state is the entire operation state, the process is terminated without executing any freeze prevention operation control.

Next, the partial operation state freezing prevention operation process will be described with reference to FIGS.
4 is a process flow diagram of the partial operation state freeze prevention operation process. FIG. 5 is a flowchart showing the freezing index temperature, the open / close state of the on-off valves 13a and 13b, and the burner 5 It is a figure which shows each change state of the heat-medium temperature detected by the output, the forward thermistor 11, etc. FIG.
Further, in the partial operation state, the terminal device indicated by reference numeral 30a is an operation terminal device in the operation state, and the terminal device indicated by reference numeral 30b is the stop terminal device in the stop state.

  In the partial operation state freezing prevention operation process, first, the operation control unit 4 changes according to the outside air temperature, and the water supply thermistor is used as a freezing index temperature that can estimate the temperature of the stop terminal device 30b in the stopped state. 21 detects the feed water temperature (step # 101).

Next, the operation control unit 4 sets, based on the freeze index temperature, the set duration T1 for determining the freeze prediction state, the set execution time T2 related to the time for executing the freeze prevention operation control, and the freeze prevention operation control. A set waiting time T3 relating to the waiting time from the end point to the next start point is determined (step # 102).
Specifically, a table describing the optimum setting continuation time T1, setting execution time T2, and setting standby time T3 with respect to the freezing index temperature is stored in the storage unit (not shown) of the operation control unit 4. The operation control unit 4 is configured to determine the optimum setting duration T1, the setting execution time T2, and the setting standby time T3 from the detected freezing index temperature with reference to the table. .

  Next, the operation control unit 4 determines whether or not the freezing index temperature detected in step # 101 is equal to or lower than a preset freezing index temperature A (step # 103), and further, the freezing index. The duration time during which the temperature continues to be equal to or lower than the set freezing index temperature A is measured (step # 104), and it is determined whether or not the duration time has reached the set duration time T1 determined in step # 102. (Step # 105).

And it continues until it determines with continuation time having reached setting continuation time T1 in step # 105, and when it determines with freezing index temperature being the setting freezing index temperature A or less in step # 103, heat-medium circulation Regardless of the heat source side heat medium temperature in the circuit 2, the freeze prevention operation control described later is started (step # 106).
On the other hand, if it is determined in step # 105 that the duration has reached the set duration T1, and it is not determined in step # 103 that the freezing index temperature is equal to or lower than the set freezing index temperature A, The partial operation state freeze prevention operation process is terminated.
That is, after the freezing index temperature becomes equal to or lower than the set freezing index temperature A, the execution of the freeze prevention operation control is prohibited until the duration time reaches the set duration time T1.

  The set freezing index temperature A is set to a temperature at which the heat medium in the branch pipes 18 and 19 on the stop terminal device 30b side may start to freeze, for example, when the freezing index temperature is the feed water temperature. The set freezing index temperature A is set to about 5 ° C. When the freezing index temperature is the outside air temperature, the set freezing index temperature A is set to about −4 ° C.

  Further, the lower the freezing index temperature, the higher the possibility that the heating medium on the stop terminal device 30b side will freeze. Therefore, in step # 102, the set duration T1 is shortened as the freezing index temperature decreases. It has been decided.

  In Step # 106, the operation control unit 4 opens the on-off valve 13b and circulates the heat medium through the branch pipes 18 and 19 on the stop terminal device 30b side to perform freeze prevention operation control for preventing the heat medium from freezing. Start.

  Further, when starting this freeze prevention operation control, the operation control unit 4 adjusts to minimize the temperature rise of the heat medium on the stop terminal device 30b side where the heat medium is circulated only for freeze prevention. Freezing prevention operation is performed by reducing the amount of fuel supplied to the burner 5 by reducing the opening of the valve 28 or by shutting off the fuel supply to the burner 5 by the shut-off valve 27 to reduce or stop the output of the burner 5. In the control, the temperature of the heat medium circulating through the heat medium circulation circuit 2 is set to be lower than the operation-time set heat medium temperature F required by the operation terminal device 30a (for example, 40 ° C.).

  Furthermore, the operation control unit 4 closes the on-off valve 13a in order to minimize the decrease in the heat medium temperature on the operation terminal device 30a side when the heat medium temperature is decreased in the freeze prevention operation control as described above. As described above, the circulation of the heat medium to the branch pipes 18 and 19 on the operation terminal device 30a side is stopped. In addition, since the room temperature control is normally performed by opening and closing the on-off valve 13a intermittently at times other than when starting up in the driving terminal device 30a, for example, the on-off valve 13a is closed for about 3 minutes to circulate the heat medium. Even in a stopped state, there is little effect on heating operation.

  The operation control unit 4 that has started the freeze prevention operation control as described above measures the execution time from the start of the freeze prevention operation control (step # 107), and the execution of the setting determined in step # 102. It is determined whether or not the time T2 has been reached (step # 108), and the freeze prevention operation control is terminated when the execution time of the freeze prevention operation control reaches the set execution time T2 (step # 109).

  That is, when ending the freeze prevention operation control, the operation control unit 4 closes the open / close valve 13b to stop the circulation of the heat medium to the branch pipes 18 and 19 on the stop terminal device 30b side, and to open the open / close valve 13a. While being in the open state, the output of the burner 5 is adjusted, and the circulation of the heating medium heated to the operating-time setting heating medium temperature F to the branch pipes 18 and 19 on the operation terminal device 30a side is started.

  Furthermore, the lower the freezing index temperature, the longer the time required from the start of the freeze prevention operation control to the state where the freezing of the heat medium on the stop terminal device 30b side is sufficiently prevented. In 102, the setting execution time T2 is determined to be longer as the freezing index temperature is lower. The setting execution time T2 varies depending on the flow path length of the heat medium circulation circuit 2 and the like, but is set to, for example, around 3 minutes.

  The operation control unit 4 that has finished the freeze prevention operation control as described above measures the waiting time from the end of the freeze prevention operation control in order to reduce the frequency of performing the freeze prevention operation control (step # 110). It is determined whether or not the standby time has reached the set standby time T3 determined in step # 102 (step # 112), and the standby time from the end of the freeze prevention operation control until the set standby time T3 is reached. By repeating this, until the standby time reaches the set standby time T3, execution of the next freeze prevention operation control is prohibited, and when the standby time reaches the set standby time T3, this partial operation state freezing prevention The operation process is terminated, and the execution of the next freeze prevention operation control is permitted.

  Furthermore, while repeating the above step # 110 and step # 112, it is determined whether or not it is a partial operation state in which only some of the terminal devices 30 are operating (step # 111). ) For example, it is determined that the operation of the operation terminal device 30a that was in the initial operation state is stopped or the operation of the operation of the stop terminal device 30b that was in the initial stop state is started, so that it is no longer in the partial operation state. In this case, the standby is stopped until the standby time reaches the set standby time T3, the partial operation state freeze prevention operation process is terminated, and the execution of the next freeze prevention operation control is permitted.

  Further, it is preferable that the freeze prevention operation control is executed more frequently as the freezing index temperature is lower. Therefore, in step # 102, the set waiting time T3 is determined to be shorter as the freezing index temperature is lower. . For example, when the freezing index temperature is 5 ° C. to 0 ° C., the set waiting time T3 is determined to be 3 hours, and when the freezing index temperature is 0 ° C. to −5 ° C., the setting waiting time T3 is set to 2 hours. When the freezing index temperature is -5 ° C to -10 ° C, the set standby time T3 is determined to be 1 hour, so that the energy consumption required for the freeze prevention operation control is reduced and the freezing is surely performed. Preventive operation control can be performed.

Next, the all-stop state freezing prevention operation process will be described based on the process flowchart shown in FIG.
In the all stop state freezing prevention operation process, first, the operation control unit 4 uses the heat source side heat in the heat source unit 1 as the forward heat medium temperature detected by the forward thermistor 11 and the return heat medium temperature detected by the return thermistor. The medium temperature is detected (step # 201), and it is determined whether or not the heat source side heat medium temperature is equal to or lower than a first set heat source side heat medium temperature B1 (step # 202).

  When it is determined in step # 202 that the heat source side heat medium temperature is equal to or lower than the first set heat source side heat medium temperature B1, freeze prevention operation control is started (step # 203), and in step # 202, the heat medium is determined. When it is not determined that the temperature is equal to or lower than the first set heat source side heat medium temperature B1, this all-stop state freeze prevention operation process is terminated.

  In step # 203, the operation control unit 4 starts the heating by the burner 5 and the operation of the circulation pump 17 while opening all the open / close valves 13 before starting the freeze prevention operation control. The heated heat medium is circulated through the branch pipes 18 and 19 on the 30 side.

  The operation control unit 4 that has started the freeze prevention operation control as described above detects the heat source side heat medium temperature again (step # 204), and the heat source side heat medium temperature is set in advance to the second set heat source. It is determined whether or not the side heat medium temperature B2 or higher is reached (step # 205), and the freeze prevention operation control is terminated when the heat source side heat medium temperature reaches or exceeds the second set heat source side heat medium temperature B2 (step # 205). Step # 206).

  That is, when the operation control unit 4 ends the freeze prevention operation control, the operation control unit 4 closes all the on-off valves 13 and stops the heating by the burner 5 and the operation of the circulation pump 17. The circulation of the heat medium to the branch pipes 18 and 19 on the terminal device 30b side is stopped.

  Further, the first set heat source side heat medium temperature B1 serving as a reference for starting the freeze prevention operation control is set to a temperature at which the heat medium in the heat medium circulation circuit 2 may start to freeze, for example, The first set heat source side heat medium temperature B1 can be set to about 5 ° C.

  Further, the second set heat source side heat medium temperature B2 that is a reference for the end of the freeze prevention operation control is higher than the first set heat source side heat medium temperature B1, and the heat medium in the heat medium circulation circuit 2 is sufficiently frozen. For example, the second set heat source side heat medium temperature B2 is set to about 20 ° C.

[Another embodiment]
Next, another embodiment of the present invention will be described.
(1) Although the water supply temperature is used as the freezing index temperature in the above-described partial operation state freeze prevention operation processing, the outside air temperature (atmosphere temperature in the heat source unit 1) detected by the outside air temperature thermistor 25 itself is frozen. It may be used as an index temperature, and further, for example, the ambient temperature outside the above-mentioned outside air temperature or feed water temperature, for example, the ambient temperature outside the heat source unit 1 or the installation of the heating equipment obtained from the WEB site providing weather information via the Internet network You may use the present outdoor temperature etc. in a place as said freezing index temperature.

(2) In the partial operation state freezing prevention operation process described above, in step # 102, a preset stored time T1, a set execution time T2, and a setting standby are set based on the freezing index temperature with reference to a table stored in advance. Although the time T3 is determined, the determination processing for classifying the freezing index temperature into a plurality of ranges and the optimum setting duration T1, the setting execution time T2, and the setting standby for each range without using a table. A determination process for determining the time T3 or the like may be incorporated into the present process. Further, a part or all of the setting duration time T1, the setting execution time T2, and the setting standby time T3 may be set to fixed values.

(3) In the above-described partial operation state freeze prevention operation process, the freeze prevention operation control is executed after the freeze index temperature becomes equal to or lower than the set freeze index temperature A until the duration reaches the set duration T1. However, if the determination index temperature is determined to be equal to or lower than the set freezing index temperature A, the freeze prevention operation control may be started immediately.

(4) In the partial operation state freeze prevention operation processing described above, the execution of the next freeze prevention operation control is prohibited until the standby time from the end of the freeze prevention operation control reaches the set standby time T3. Alternatively, this partial operation state freeze prevention operation process may be immediately terminated at the end of the freeze prevention operation control, and the execution of the next freeze prevention operation control may be permitted.

(5) In the freeze prevention operation control in the partial operation state freeze prevention operation process described above, the output of the burner 5 is reduced or stopped, and a heat medium having a temperature lower than the operation-set heat medium temperature F is supplied to the heat medium circuit. However, in the anti-freezing operation control, the heat medium heated to the set heat medium temperature F during operation may be circulated through the heat medium circuit 2 separately.

(6) In the freeze prevention operation control in the above-described partial operation state freeze prevention operation processing, the on-off valve 13a on the operation terminal device 30a side is closed, and the heat medium to the branch pipes 18 and 19 on the operation terminal device 30a side is closed. However, in the freeze prevention operation control, the circulation of the heat medium to the operation terminal device 30a may be continued without stopping.

(7) In the above-described partial operation state freeze prevention operation process, the end of the freeze prevention operation control is determined based on whether or not the execution time has reached the set execution time T2, but the freeze operation control is ended by another method. You may judge. For example, the freeze prevention operation control may be continuously executed while the freezing index temperature is equal to or lower than a predetermined set freezing index temperature.

(8) In the embodiment described above, the all-stop state freeze-prevention operation process is executed when it is determined in step # 2 of the freeze-preventing operation method that the engine is in the all-stop state. The partial operation state freeze prevention operation process may be executed.

(9) In the freeze prevention operation control in the partial operation state freeze prevention operation processing described above, the terminal side thermistor 31 for individually detecting the heat medium temperature on the terminal device 30 side, such as an acon or a bathroom heating dryer. Is provided, the partial operation state freeze prevention operation processing described in the above embodiment may be executed along a processing flow as shown in FIG.

  That is, the operation control unit 4 communicates with the remote controller 7b to which the detection result of the terminal-side thermistor 31 on the stop terminal device 30b side is input, and detects the terminal-side heat medium temperature on the stop terminal device 30b side. (Stick # 121), it is determined whether or not the terminal-side heat medium temperature is equal to or lower than a first set terminal-side heat medium temperature A1 (for example, 4 ° C.) (step # 122).

  When it is determined in step # 122 that the terminal-side heat medium temperature on the stop terminal device 30b side is equal to or lower than the first setting terminal-side heat medium temperature A1, the above-described freeze prevention operation control is started (step # 123). ) If it is not determined in step # 122 that the terminal side heat medium temperature on the stop terminal device 30b side is equal to or lower than the first set terminal side heat medium temperature A1, the partial operation state freeze prevention operation process is terminated. .

  The operation control unit 4 that has started the freeze prevention operation control as described above detects the terminal-side heat medium temperature on the stop terminal device 30b side again (step # 124), and the terminal-side heat medium temperature is preset. It is determined whether or not the temperature has reached a second setting terminal side heat medium temperature A2 (for example, 20 ° C.) that is the setting terminal side heat medium temperature (step # 125), and the terminal side heat medium temperature is determined to be the second setting terminal. When the side heat medium temperature A2 or higher is reached, the freeze prevention operation control is terminated regardless of whether or not the execution time of the freeze prevention operation control has reached the set execution time (step # 126).

  In such another embodiment, the start of the freeze prevention operation is determined by whether or not the freezing index temperature such as the outside air temperature or the feed water temperature is equal to or lower than the set freezing index temperature A, as in the above-described embodiment. It doesn't matter.

Schematic configuration diagram of heat source Schematic configuration diagram of operation control unit Process flow diagram of freeze prevention operation method Partial operation state freeze prevention operation processing flow diagram The figure which shows the various change state by the partial operation state freeze prevention operation processing Process flow chart of all-stop freeze prevention operation process Process flow diagram of another embodiment of partial operation state freeze prevention operation process

Explanation of symbols

1: Heat source machine 2: Heat medium circulation circuit 3: Hot water supply path 4: Operation control unit (operation control means)
5: Burner 10: Heating heat exchanger 11: Outward thermistor 13, 13a, 13b: Open / close valve 15: Return thermistor 17: Circulating pump 20: Hot water supply heat exchanger 21: Water supply thermistor 25: Outside temperature thermistor 30: Terminal equipment 30a: driving terminal device 30b: stop terminal device 31: terminal side thermistor A: set freezing index temperature A
A2: Second setting terminal side heat medium temperature (setting terminal side heat medium temperature)
B1: First set heat source side heat medium temperature B2: Second set heat source side heat medium temperature T1: Setting duration T2: Setting execution time T3: Setting standby time

Claims (5)

A heat medium circulating circuit configured to be able to selectively circulate a heat medium heated by a heat source device to a plurality of terminal devices; and In a heating system comprising operation control means capable of executing freeze prevention operation control for preventing freezing of the heat medium,
In the case where the operation control means is in a partial operation state in which only some of the plurality of terminal devices are operated, the heat medium on the stop terminal device side other than the operation terminal devices is frozen. When the anti-freezing operation control is started and the anti-freezing operation control is started and the partial operation state is started, the heat medium to the operation terminal device side is executed during the execution of the anti-freezing operation control. Freezing prevention operation method characterized by stopping circulation of   2. The freeze prevention operation method according to claim 1, wherein the operation control means ends the freeze prevention operation control when an execution time from a start time of the freeze prevention operation control reaches a set execution time. .   When the operation control means is in the partial operation state, the heat medium temperature to be circulated during execution of the freeze prevention operation control is set lower than the heat medium temperature required by the operation terminal device. The freeze prevention operation method according to claim 1 or 2. A heat medium circulating circuit configured to be able to selectively circulate a heat medium heated by a heat source device to a plurality of terminal devices; and A heating system comprising operation control means capable of executing freeze prevention operation control for preventing freezing of the heat medium,
In the case where the operation control means is in a partial operation state in which only some of the plurality of terminal devices are operated, the heat medium on the stop terminal device side other than the operation terminal devices is frozen. When the predicted anti-freezing state is entered, the anti-freezing operation control is configured to be executed, and in the partial operation state, during the execution of the anti-freezing operation control, the operation terminal device side A heating system configured to stop the circulation of the heat medium to the.   When the operation control means is in the partial operation state, the heat medium temperature to be circulated during execution of the freeze prevention operation control is configured to be set lower than the heat medium temperature required by the operation terminal device. The heating system according to claim 4.

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