JP2006038383A - Hot water heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water heating system capable of calculating a suitable duty ratio even when a plurality of floor heating systems are performing a heating operation by duty-ratio control of a thermal valve. <P>SOLUTION: In a floor heating system C having been switched from the opening/closing control of a flow control valve 43c to the duty-ratio control of the thermal valve 47c, the control cycle of the duty-ratio control is started from the switch point, the thermal valve 47c is closed since the start time until a lapse of calculated valve closed time in each control cycle, and the thermal valve 47c is opened after the closed time period elapses until the control cycle finishes. In a floor heating system B switching from the opening/closing control of a flow control valve 43b to the duty-ratio control of a thermal valve 47b after the floor heating system C, the control cycle of the floor heating system C is set at a master control cycle, and the control cycle is made to be synchronized with the master control cycle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water heating system in which a floor heating terminal device performs floor heating using hot water generated by a hot water heating heat source.

  The inventor of the present application has proposed, for example, a hot water heating system as shown in FIG. 3 as a hot water heating system that performs floor heating using hot water generated by a hot water heating heat source. As shown in the figure, the hot water heating system 50 includes a hot water heating heat source 51 that generates hot water having a predetermined temperature, and a floor heating mat that is circulated and supplied with the hot water generated by the hot water heating heat source 51. 52a, 52b, circulation forward main pipe 61 and circulation return main pipe 62 connected to the hot water heating heat source 51, and circulation forward branch pipe 63a connecting the floor heating mats 52a, 52b to the circulation forward main pipe 61 and the circulation return main pipe 62, respectively. 63b and the circulation return branch pipes 64a and 64b and the floor heating mats 52a and 52b, the flow control valves 65a and 65b installed in the circulation forward branch pipes 63a and 63b, and the floor heating mat in the circulation return main pipe 62, respectively. A terminal circulation main pipe 66 connected downstream of the connection positions of 52a and 52b, and a terminal-side circulation pump 67 installed in the terminal circulation main pipe 66 Terminal circulation branch pipes connecting the downstream sides of the flow control valves 65a and 65b in the circulation forward branch pipes 63a and 63b and the downstream side of the terminal side circulation pump 67 in the terminal circulation main pipe 66 for each of the floor heating mats 52a and 52b. 68a and 68b, and thermal heating valves 69a and 69b installed in the respective terminal circulation branch pipes 68a and 68b are provided for the floor heating mats 52a and 52b.

  In this hot water heating system 50, after starting the operation, in order to raise the surface temperature of the floor heating floor to a predetermined temperature within a short time, the thermal valves 69a and 69b are closed and the flow control valves 65a, With the 65b fully open, operation is performed in an initial operation mode in which high-temperature hot water generated by the hot water heating heat source 51 is circulated to the floor heating mats 52a and 52b. When the temperature rises to a predetermined temperature, the flow control valves 65a and 65b are once fully closed, then the thermal valves 69a and 69b are opened and the operation of the terminal-side circulation pump 67 is started. , 52b is switched to the first steady operation mode in which the opening degree of the flow control valves 65a, 65b is adjusted so that the supply temperature of the hot water to the set temperature becomes the set temperature.

  Further, for example, when one floor heating mat 52a performs a heating operation in the first steady operation mode, when the other floor heating mat 52b starts the heating operation, the other floor heating mat 52b includes a hot water heater. Since the high-temperature hot water generated by the heat source device 51 is directly supplied, the return temperature of the hot water sent from the floor heating mat 52b is also high, and the floor heating mat 52a performing the heating operation in the first steady operation mode The hot water sent from both floor heating mats 52a and 52b may be mixed to supply hot water higher than the set temperature. In such a case, the flow control valve 65a is fully closed. However, since the supply temperature of the hot water to the floor heating mat 52a exceeds the set temperature, if such a state continues for a predetermined time, the thermally operated valve that is maintained in the open state The 9a, according to the duty ratio, so that the switching to the second steady operation mode to periodically open and close.

JP 2001-074255 A

  By the way, the duty ratio of the thermal valve of the floor heating system performing the heating operation in the second steady operation mode is calculated based on the supply temperature of the hot water to the floor heating mat of the floor heating system. In the state in which the floor heating system performs the heating operation in the second steady operation mode, the thermal valves of the floor heating systems perform opening and closing operations at different timings, and accordingly, the second steady operation is performed. The mixed return temperature in which hot water sent from the floor heating mats of each floor heating system performing heating operation in the mode is mixed, in other words, the supply temperature of the hot water to the floor heating mats of those floor heating systems, Since it will fluctuate greatly due to the opening and closing operation of the thermal valve of other floor heating systems, calculating the duty ratio based on the supply temperature with such a large fluctuation will result in an appropriate duty There is a problem can not be calculated ratios.

  Therefore, an object of the present invention is to provide a hot water heating system capable of calculating an appropriate duty ratio even when a plurality of floor heating systems are performing heating operation in the second steady operation mode. is there.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a hot water heating system in which a plurality of floor heating terminal devices perform floor heating using hot water having a predetermined temperature generated by a hot water heating heat source. A circulation forward main pipe and a circulation return main pipe connected to the hot water heating heat source unit, a circulation forward branch pipe and a circulation return branch pipe connecting the plurality of floor heating terminal devices to the circulation forward main pipe and the circulation return main pipe, respectively; Connected to the downstream side of the connection position of the circulation return branch pipe connected to the most downstream side in the circulation return main pipe and the flow control valve installed in each circulation forward branch pipe for each floor heating terminal device The terminal circulation main pipe in which the terminal side circulation pump is installed, and the floor heating terminal apparatus, the downstream side of the flow control valve in each circulation forward branch pipe and the terminal circulation main pipe, respectively. A terminal circulation branch pipe connecting to the downstream side of the terminal side circulation pump, and an opening / closing valve installed in each terminal circulation branch pipe for each floor heating terminal device, and opening the opening / closing valve A first steady operation mode of adjusting the opening degree of the flow control valve so that the supply temperature of hot water to each floor heating terminal device becomes a set supply temperature while operating the terminal circulation pump in a state; A second steady operation mode for periodically opening and closing the on-off valve when the supply temperature of the hot water to the floor heating terminal device exceeds a set supply temperature even when the flow control valve is fully closed, When the floor heating terminal device is operating in the second steady operation mode, the hot water heating is characterized in that the control periods of the on-off valves corresponding to the floor heating terminal device are synchronized. Also provide system It is.

  The invention according to claim 2 is the hot water heating system of the invention according to claim 1, in which the hot water on the downstream side from the connection position of the circulation return branch pipe connected to the most downstream side in the circulation return main pipe. Based on the mixed return temperature, the valve opening time or valve closing time with respect to the control cycle of the on-off valve is calculated.

  Further, the invention according to claim 3 is the hot water heating system according to claim 1 or 2, wherein each floor heating terminal device has a different heat dissipation characteristic based on a different calculation formula for each floor heating terminal device. The valve opening time or the valve closing time with respect to the control cycle of the on-off valve corresponding to is calculated.

  As described above, in the hot water heating system according to the first aspect of the present invention, when the plurality of floor heating terminal devices are operating in the second steady operation mode, the on-off valves corresponding to the floor heating terminal devices are provided. Since the control cycles are synchronized, the closing timings or opening timings of the on-off valves corresponding to all the floor heating terminal devices operating in the second steady operation mode coincide with each other.

  Therefore, there is always a state in which the open / close valves corresponding to all the floor heating terminal devices operating in the second steady operation mode are simultaneously opened for each control cycle. In the state, the mixing return temperature (the supply temperature of the hot water to the floor heating terminal device) mixed with the hot water sent from the floor heating terminal device of each floor heating system does not fluctuate greatly. An appropriate valve opening time or valve closing time can be calculated by calculating the valve opening time or the valve closing time for the control cycle of the on-off valve based on the supply temperature of the hot water to the terminal device.

  Further, in the hot water heating system according to the second aspect of the invention, the valve opening time or the closing time with respect to the control cycle of the on-off valve is based on the mixed return temperature in which the hot water sent from the floor heating terminal device of each floor heating system is mixed. Since the valve time is calculated, the inlet temperature of the hot water in the floor heating terminal device of each floor heating system is detected by an individual temperature sensor, and based on the respective inlet temperatures, the opening / closing of each on-off valve with respect to the control cycle is detected. As in the case of calculating the valve time or the valve closing time, there is no influence of variations in the temperature detected by each temperature sensor.

  In the hot water heating system of the invention according to claim 3, for each floor heating terminal device having different heat dissipation characteristics, the valve opening time with respect to the control cycle of the on-off valve corresponding to each floor heating terminal device based on a different arithmetic expression Alternatively, since the valve closing time is calculated, it is possible to perform more appropriate temperature control according to the heat dissipation characteristics of each floor heating terminal device.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows a hot water heating system 1 for heating a living room. As shown in the figure, the hot water heating system 1 uses a hot water heating heat source unit 10 that generates hot water of a predetermined temperature (for example, 80 ° C.) and heating using the hot water generated by the hot water heating heat source unit 10. A plurality of hot water heating terminal devices, and as the hot water heating terminal device, a plurality of floor heating mats 21a as low temperature terminal devices that exhibit rated heating capacity by supplying hot water of about 60 ° C., 21b and 21c and a fan convector 22 as a high-temperature terminal device that exhibits a rated heating capability by supplying hot water of about 80 ° C. are employed.

  The hot water heating heat source unit 10 includes a heat exchanger 11 connected to an internal forward pipe 13 and an internal return pipe 14 constituting a hot water circulation path, a circulation pump 12 installed in the internal return pipe 14, and heat exchange. And a controller 15 for controlling the combustion operation of a burner (not shown) for heating the vessel 11 and the operation operation of the circulation pump 12, etc. The internal forward pipe 13 and the internal return pipe 14 are provided with a hot water circulation path. A circulation forward main pipe 31S and a circulation return main pipe 31R which are external pipes to be configured are respectively connected.

  The circulation forward main pipe 31S and the circulation return main pipe 31R are, on each terminal side, the low temperature terminal side circulation forward main pipe 32S and the low temperature terminal side circulation return main pipe 32R, the high temperature terminal side circulation forward main pipe 33S, and the high temperature terminal side circulation return main pipe 33R. The low temperature terminal side circulation outgoing main pipe 32S and the low temperature terminal side circulation return main pipe 32R are connected to the floor heating mats 21a, 21b, and 21c via the connection control unit 40, and are also connected to the high temperature terminal side circulation. The outgoing main pipe 33S and the high temperature terminal side circulation return main pipe 33R are directly connected to the fan convector 22.

  The connection control unit 40 internally circulates the internal circulation forward main pipe 41S and the internal circulation return main pipe 41R connected to the low temperature terminal side circulation forward main pipe 32S and the low temperature terminal side circulation return main pipe 32R, and the floor heating mats 21a, 21b, and 21c. Circulation forward branch pipes 42Sa, 42Sb, 42Sc and circulation return branch pipes 42Ra, 42Rb, 42Rc connected to the forward main pipe 41S and the internal circulation return main pipe 41R, respectively, and the circulation forward branch for each of the floor heating mats 21a, 21b, 21c. Variable flow rate type connected to the downstream side of the connection position of the flow return control valves 43a, 43b, 43c installed in the pipes 42Sa, 42Sb, 42Sc and the circulation return branch pipes 42Ra, 42Rb, 42Rc in the internal circulation return main pipe 41R Terminal circulation main pipe 44 in which the terminal side circulation pump 46 is installed, and a floor heating mat Terminals connecting the downstream side of the flow control valves 43a, 43b, 43c in the respective circulation forward branch pipes 42Sa, 42Sb, 42Sc and the downstream side of the terminal side circulation pump 46 in the terminal circulation main pipe 44 for each 1a, 21b, 21c For each of the circulation branch pipes 45a, 45b, 45c, the floor heating mats 21a, 21b, 21c, thermal valves 47a, 47b, 47c installed in the respective terminal circulation branch pipes 45a, 45b, 45c, and circulation forward branch pipes Outward temperature sensors 48a, 48b, 48c for detecting the supply temperature of hot water to the respective floor heating mats 21a, 21b, 21c installed downstream of the flow control valves 43a, 43b, 43c in 42Sa, 42Sb, 42Sc, and On the downstream side of the connection position of the circulation return branch pipes 42Ra, 42Rb, 42Rc in the internal circulation return main pipe 41R. The return temperature sensor 48d for detecting the mixing return temperature of the hot water sent from the respective floor heating mats 21a, 21b, 21c and the floor heating mats 21a, 21b detected by the forward temperature sensors 48a, 48b, 48c. , The flow control valves 43a, 43b, 43c and the thermal valve 47a, based on the mixed return temperature of the warm water from the floor heating mats 21a, 21b, 21c detected by the warm water supply temperature and return temperature sensor 48d. And a controller 49 for controlling the opening / closing operation of 47b and 47c and the operation operation of the terminal side circulation pump 46. The controller 49 is connected to the controller 15 of the hot water heating heat source unit 10 through a serial interface so as to be communicable. ing. Note that the controller 23 that controls the operation of the fan convector 22 is also connected to the controller 15 of the hot water heating heat source machine 10 through a serial interface in the same manner as the controller 49 of the connection control unit 40.

  The floor heating mat 21a, the floor heating mat 21b, and the floor heating mat 21c have different heat dissipation characteristics, and the supply temperature of hot water for exerting the rated capacity is set to 60 ° C, 50 ° C, and 40 ° C. Yes.

  In the hot water heating system 1 configured as described above, when the operation switch of the floor heating remote control or the operation switch of the fan convector 22 is turned on, the controller 49 of the connection control unit 40 or the controller 23 of the fan convector 22 is used. 10 is output to the controller 15, the burner of the hot water heating heat source unit 10 starts combustion, the circulation pump 12 starts operation, and 80 ° C. hot water is circulated and supplied to the connection control unit 40 and the fan convector 22. The Hereinafter, the operation of the floor heating system will be described in detail. In the following description, the floor heating systems including the floor heating mat 21a, the floor heating mat 21b, and the floor heating mat 21c are referred to as a floor heating system A, a floor heating system B, and a floor heating system C. .

  First, when the operation switch of the floor heating system A is turned on, the floor heating system A starts the floor heating operation in the initial operation mode. That is, the flow control valve 43a is opened until it is fully opened with the thermal valve 47a of the floor heating system A that has started operation closed. At this time, the flow control valves 43b and 43c and the thermal valves 47b and 47c of the other floor heating systems B and C are held in a fully closed state, and the terminal-side circulation pump 46 has stopped operating. The hot water (80 ° C.) generated by the heating heat source unit 10 is directly circulated and supplied to the floor heating mat 21a, and the surface temperature of the floor heating floor where the floor heating is started rises in a short time. become.

  Here, when the actual surface temperature of the floor heating floor in the floor heating system A exceeds the set surface temperature corresponding to the heating level selected by the user, the initial operation mode described above is switched to the first steady operation mode. It has become. That is, after the flow control valve 43a in the fully opened state is once closed to the fully closed state, the thermal valve 47a is opened and the operation of the terminal side circulation pump 46 is started, and after the heat radiation sent from the floor heating mat 21a is started. The supply temperature of the hot water to the floor heating mat 21a detected by the going-out temperature sensor 48a while circulating and supplying to the floor heating mat 21a without returning a part of the hot water to the hot water heating heat source unit 10 is the set supply temperature Ts ( For example, by adjusting the opening degree of the flow rate control valve 43a so as to be 60 ° C., the supply amount of the high-temperature (80 ° C.) hot water generated by the hot water heating heat source unit 10 to the floor heating mat 21a is controlled. It is supposed to be. The set supply temperature Ts is set in advance for each set surface temperature corresponding to the heating level selected by the user. Under predetermined conditions, the hot water at the set supply temperature Ts is heated to the floor heating mats 21a, 21b, 21c. The surface temperature of the floor heating floor is generally maintained at the set surface temperature.

  In this way, when the floor heating system A is performing the floor heating operation in the first steady operation mode, when the operation switch of the floor heating system B is turned on, the floor heating system B is in the initial operation mode. Although the operation is started, as described above, in the initial operation mode, the flow control valve 43b is opened to the fully opened state with the thermal valve 47b of the floor heating system B that has started the operation closed. The hot water (80 ° C.) generated by the hot water heating heat source unit 10 is directly supplied to the mat 21b, and accordingly, the mat 21b is relatively hot (70 ° C. or higher) from the floor heating mat 21b of the floor heating system B. Of hot water will be sent out.

  On the other hand, the floor heating mat 21a of the floor heating system A that is performing the floor heating operation in the first steady operation mode has hot water after heat radiation sent from the floor heating mats 21a and 21b of both floor heating systems A and B. Is mixed and supplied again, so that when a relatively hot water is sent from the floor heating mat 21b of the floor heating system B performing the floor heating operation in the initial operation mode, the return temperature sensor Even if the mixed return temperature Tr of the warm water from the floor heating mats 21a and 21b detected by 48d exceeds the set supply temperature Ts and the flow control valve 43a of the floor heating system A is fully closed, the floor heating mat 21a It may become impossible to maintain the supply temperature of hot water to the set supply temperature Ts.

  Therefore, in this hot water heating system 1, even if the flow control valves 43a, 43b, 43c of the floor heating systems A, B, C that are performing the floor heating operation in the first steady operation mode are closed to the fully closed state, When the state where the mixing return temperature Tr of warm water delivered from the floor heating mats 21a, 21b, 21c exceeds the set supply temperature Ts continues for a predetermined time (for example, 10 minutes), each floor heating system A, B, C The first steady operation mode is switched to the second steady operation mode. That is, the valve control (duty ratio) that periodically opens and closes the thermally operated valves 47a, 47b, 47c held in the valve open state according to the ratio (duty ratio) of the opening / closing control time calculated by the arithmetic expression shown in Equation 1. Ratio control).

  Specifically, based on the mixed return temperature Tr detected by the return temperature sensor 48d for 30 seconds immediately before the start of each control cycle (for example, 20 minutes) tp, the valve closing time tc in the control cycle tp is set in advance. The thermal valve is closed until the valve closing time tc elapses after the start of the control cycle tp, and between the time when the valve closing time tc elapses and the time when the control cycle tp ends. Opens the thermal valve. Further, the valve closing time tc is set to 2 minutes when the calculated value is 2 minutes or less, and to 18 minutes when the calculated value is 18 minutes or more, so 30 seconds immediately before the start of the control cycle tp. The valve closing time tc is always calculated based on the mixing return temperature Tr when the thermal valve is open and hot water is circulated and supplied to the floor heating mat.

Further, as can be seen from Equation 1, the duty ratio Rd is the ratio of the valve opening time to with respect to the control period tp. Each heating mat is different. That is, when calculating ΔT ₀ , ΔT ₁ and α, coefficients a to e according to the heat radiation characteristics of the floor heating mat are used. In this hot water heating system 1, since the heat radiation characteristics of the floor heating mats 21a, 21b, 21c used in the floor heating systems A, B, C are different from each other, the heat of each floor heating system A, B, C is different. When the duty ratios of the valves 47a, 47b, 47c are controlled, the duty ratio Rd (in other words, the valve opening time to, the valve closing time tc) is calculated according to different arithmetic expressions. Thus, appropriate temperature control according to the heat radiation characteristics of the respective floor heating mats 21a, 21b, and 21c is performed.

  Then, when the floor heating system B is switched from the initial operation mode to the first steady operation mode, when the supply temperature of the hot water to the floor heating mat 21a detected by the forward temperature sensor 48a falls below the set supply temperature Ts, again. The second steady operation mode is switched to the first steady operation mode.

  Further, in the hot water heating system 1, as described above, the set supply temperatures Ts for exerting the rated capacity of the floor heating mats 21a, 21b, 21c are different from each other. When the heating operation is performed, even if there is no floor heating system that performs the floor heating operation in the initial operation mode, the mixed return temperature Tr is obtained for the floor heating system having a low set supply temperature Ts of the floor heating mat. May become higher than the set supply temperature Ts. In such a case, the floor heating system having a low set supply temperature Ts of the floor heating mat performs the floor heating operation in the second steady operation mode. That is, when one or both of the floor heating systems B and C are simultaneously performing the floor heating operation together with the floor heating system A having the highest set supply temperature Ts of the floor heating mat, the floor heating system A is the first. In the steady operation mode, one or both of the floor heating systems B and C perform the floor heating operation in the second steady operation mode, and only the floor heating systems B and C perform the floor heating operation at the same time. The floor heating system B performs the floor heating operation in the first steady operation mode and the floor heating system C performs the second steady operation mode, respectively.

  Here, when the floor heating systems A, B, and C are performing the floor heating operation in the first steady operation mode, the floor heating systems B and C are switched from the first steady operation mode to the second steady operation mode. This operation will be described with reference to the timing chart shown in FIG.

  In a state where each floor heating system A, B, C is performing the floor heating operation in the first steady operation mode, first, the floor heating mat 21c having the lowest set supply temperature Ts for exerting the rated capacity is used. After the existing floor heating system C is first switched to the second steady operation mode, the floor heating system B is subsequently switched to the second steady operation mode.

  Here, the floor heating system C that is first switched from the first steady operation mode to the second steady operation mode, as shown in FIG. In the example, 20 minutes) is started, and in each control cycle, the control cycle (20 minutes) starts from the time when the valve closing time (X) calculated in 30 seconds immediately before the control cycle (20 minutes) has elapsed. The thermal valve 47c is opened until the end, but the floor heating system B that switches from the first steady operation mode to the second steady operation mode after the floor heating system C is used. The control cycle (20 minutes) is not started from the time of switching to the second steady operation mode as in C, but the control cycle of the floor heating system C that has been switched to the second steady operation mode first is master-controlled. Cycle and second later The control period of normal operation mode to the switched floor heating system B are adapted to synchronize to the master control cycle. Hereinafter, a method of synchronizing the control cycle of the floor heating system B with the master control cycle of the floor heating system C will be described.

  First, as shown in FIG. 5B, the calculation was performed when the floor heating system B was switched to the second steady operation mode at the time when the time V had elapsed from the start of the master control cycle (20 minutes). When the valve closing time (Y) of the thermal valve 47b is the same as the elapsed time (V) of the master control cycle or shorter than the elapsed time (V) of the master control cycle (Y ≦ V), the floor heating system B Without closing the thermal valve 47b immediately at the time of switching of the operation mode, the valve opening state is maintained until the end of the master control cycle (20 minutes), and from the start of the next master control cycle (20 minutes). After the thermal valve 47b is closed until the valve closing time (Y) elapses, the valve is opened from the time when the valve closing time (Y) elapses until the end of the master control cycle (20 minutes). Repeats this.

  On the other hand, as shown in FIG. 5C, when the calculated valve closing time (Y) of the thermal valve 47b is longer than the elapsed time (V) of the master control cycle (Y> V), The thermal valve 47b of the floor heating system B is immediately closed when the operation mode is switched, and the valve is closed until the valve closing time (Y) elapses from the start of the master control cycle (20 minutes). The valve is opened from the time when the valve closing time (Y) elapses until the end of the master control period (20 minutes). Then, from the start of the next master control cycle (20 minutes) until the valve closing time (Y) elapses, the master valve is started from the time when the valve closing time (Y) elapses after the thermal valve 47b is closed. The valve is opened until the end of the control cycle (20 minutes), and thereafter this is repeated.

  Therefore, in this hot water heating system 1, when the floor heating systems B and C are simultaneously performing the floor heating operation in the second steady operation mode, the thermal valves 47b and 47c corresponding to the floor heating systems B and C are closed. The valve timings coincide with each other, and in each master control period (20 minutes), the state in which the thermal valves 47b and 47c are simultaneously opened exists for at least 2 minutes.

  Thus, the mixing return temperature Tr does not fluctuate greatly for 2 minutes immediately before the end of each control cycle tp (20 minutes) in the floor heating systems B and C, and immediately before the end of each control cycle tp (20 minutes). By calculating the duty ratio Rd (valve opening time to, valve closing time tc) in the next control cycle tp (20 minutes) based on the mixed return temperature Tr detected by the return temperature sensor 48d in 30 seconds, An appropriate duty ratio Rd (valve opening time to, valve closing time tc) can be calculated.

  Moreover, in this hot water heating system 1, based on the mixing return temperature Tr with which the hot water sent out from the floor heating mat 21a, 21b, 21c of each floor heating system A, B, C was mixed, thermal valve 47b, 47c Since the duty ratio Rd (valve opening time to, valve closing time tc) is calculated, the hot water to the floor heating mats 21b and 21c of the floor heating systems B and C detected by the forward temperature sensors 48b and 48c is calculated. As in the case of calculating the duty ratio Rd (valve opening time to, valve closing time tc) for each of the thermal valves 47b and 47c based on the supply temperature of There is nothing.

  In the above-described embodiment, the elapsed time (V) of the master control cycle at the time when the floor heating system B is switched to the second steady operation mode and the valve closing time (Y) of the thermal valve 47b of the floor heating system B. When the valve closing time (Y) ≦ the elapsed time (V), the thermal valve 47b is not closed until the master control cycle when the operation mode is switched is completed. In the case of (Y)> elapsed time (V), the thermal valve 47b is closed for the time (Y-V) from the time when the operation mode is switched. However, the present invention is not limited to this. For example, when the remaining time in the master control cycle when the operation mode is switched is W, the valve closing possible time (W-2 minutes) is compared with the valve closing time (Y) of the thermal valve 47b, and the valve closing is performed. Time (Y) ≤ Valve closing time (W-2 minutes) When the operation mode is switched until the valve closing time (Y) elapses, the thermal valve 47b is closed until the master control cycle ends after the valve closing time (Y) elapses. Opens the thermal valve 47b. When the valve closing time (Y)> the valve closing possible time (W-2 minutes), the valve closing possible time (W-2 minutes) from the time when the operation mode is switched. ) Until the master control cycle ends from the time when the valve closing possible time (W-2 minutes) has elapsed, that is, the last two minutes in the master control cycle. Only the thermal valve 47b may be opened.

  Moreover, although embodiment mentioned above demonstrated the hot-water heating system with three floor heating systems, it is not limited to this, The hot-water heating system with three or more floor heating systems, and 2nd steady operation mode If the floor heating operation is performed simultaneously, the present invention can be applied to a hot water heating system having two floor heating systems.

  Moreover, in embodiment mentioned above, although the fan convector 22 is provided other than floor heating system A, B, C, it is not limited to this, The hot water heating system of this invention is a some floor | floor. What is necessary is just to provide the heating system.

  In the above-described embodiment, during the operation in the second steady operation mode, the duty ratio Rd (the valve opening time to, the closing time) is based on the mixed return temperature Tr and the set supply temperature Ts detected by the return temperature sensor 48d. The valve time tc) is calculated, but the present invention is not limited to this. The temperature of the hot water supplied to the floor heating mats 21a, 21b, 21c detected by the outgoing temperature sensors 48a, 48b, 48c is calculated. Based on this, it is also possible to calculate the duty ratio Rd (valve opening time to, valve closing time tc).

It is a schematic structure figure showing one embodiment of the hot water heating system concerning this invention. (A) is a timing chart showing the opening and closing operation of the thermal valve of the floor heating system C in the hot water heating system same as the above, (b), (c) are the control cycle of the floor heating system B, and the master control of the floor heating system C It is a timing chart which shows the opening / closing operation | movement of a thermal valve at the time of synchronizing with a period. It is a schematic block diagram which shows the conventional warm water heating system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water heating system 10 Hot water heating heat source machine 11 Heat exchanger 12 Circulation pump 13 Internal forward pipe 14 Internal return pipe 15 Controller 21a, 21b, 21c Floor heating mat (floor heating terminal device)
22 Fancon vector 23 Controller 31S Circulation return main pipe 31R Circulation return main pipe 32S Low temperature terminal side circulation return main pipe 32R Low temperature terminal side circulation return main pipe 33S High temperature terminal side circulation return main pipe 33R High temperature terminal side circulation return main pipe 40 Connection control unit 41S Internal circulation forward main pipe 41R Internal circulation return main pipe 42Sa, 42Sb, 42Sc Circulation forward branch pipe 42Ra, 42Rb, 42Rc Circulation return branch pipe 43a, 43b, 43c Flow control valve 44 Terminal circulation main pipe 45a, 45b, 45c Terminal circulation branch pipe 46 Terminal side circulation pump 47a 47b, 47c Thermally operated valves (open / close valves)
48a, 48b, 48c Outward temperature sensor 48d Return temperature sensor 49 Controller

Claims (3)

In a hot water heating system in which a plurality of floor heating terminal devices perform floor heating using hot water of a predetermined temperature generated by a hot water heating heat source machine,
A circulation return main pipe and a circulation return main pipe connected to the hot water heating heat source machine;
A circulation forward branch pipe and a circulation return branch pipe connecting a plurality of the floor heating terminal devices to the circulation forward main pipe and the circulation return main pipe, respectively;
For each of the floor heating terminal devices, a flow control valve installed in each circulation forward branch pipe,
A terminal circulation main pipe connected to the downstream side of the connection position of the circulation return branch pipe connected to the most downstream side in the circulation return main pipe, and provided with a terminal side circulation pump;
For each floor heating terminal device, a terminal circulation branch pipe that connects a downstream side of the flow control valve in each circulation forward branch pipe and a downstream side of a terminal side circulation pump in the terminal circulation main pipe,
Each floor heating terminal device comprises an on-off valve installed in each terminal circulation branch pipe,
While operating the terminal circulation pump with the on-off valve opened, the opening degree of the flow control valve is adjusted so that the supply temperature of the hot water to each floor heating terminal device becomes the set supply temperature A first steady operation mode;
A second steady operation mode for periodically opening and closing the on-off valve when the supply temperature of hot water to the floor heating terminal device exceeds a set supply temperature even when the flow control valve is fully closed,
When a plurality of the floor heating terminal devices are operating in the second steady operation mode, the hot water is characterized in that the control periods of the on-off valves corresponding to the floor heating terminal devices are synchronized. Heating system.   Based on the mixing return temperature of the hot water downstream from the connection position of the circulation return branch pipe connected to the most downstream side in the circulation return main pipe, the valve opening time or the valve closing time for the control cycle of the on-off valve is calculated. The hot water heating system according to claim 1, which is calculated.   A valve opening time or a valve closing time with respect to a control cycle of the on-off valve corresponding to each floor heating terminal device is calculated for each of the floor heating terminal devices having different heat radiation characteristics based on different arithmetic expressions. Item 3. A hot water heating system according to item 1 or 2.

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