JPH10103686A - Hot water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid overshooting of outlet water temperature of a heat exchanger in a hot water heater in which it includes a plurality of burners for heating a heat exchanger, a warm water supply pipe and a warm water return pipe for circulating warm water among the heat exchanger, a warm water heater, and a heat radiator such as a warm water mat and in which the number of combustion of the burners is adjusted to alter the amount of supply heat to the heat exchanger based upon a temperature difference between set temperature and the outlet water temperature of the heat exchanger and upon the temperature gradient of the outlet water temperature. SOLUTION: There is provided judgment means for judging whether or not outlet water temperature of a heat exchanger 2 is likely to rise. There is further provided contribution rate set means in which when the outlet water temperature is likely to rise, there is increased a contribution rate of temperature gradient of the outlet water temperature upon the amount of heat supplied to the heat exchanger 2 being set while there is reduced a contribution rate of the temperature gradient of the outlet water temperature upon the amount of heat supplied to the heat exchanger 2 being set when the outlet water temperature is unlikely to rise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of burners for heating a heat exchanger, a hot water supply pipe for circulating hot water between the heat exchanger and a radiator, and a hot water return pipe. The present invention relates to a hot water heating apparatus that changes the amount of heat supplied to a heat exchanger by increasing or decreasing the number of burners based on a temperature difference between an outlet water temperature of a heat exchanger and a set temperature and a temperature gradient of the outlet water temperature.

[0002]

2. Description of the Related Art Conventionally, in this type of hot water heating apparatus, as shown in Equation 1, based on a temperature difference between a set temperature Ts and an outlet water temperature T of the heat exchanger and a temperature gradient dT / dt of the outlet water temperature T. , The amount of heat dQ supplied to the heat exchanger was set.

[0003]

DQ = A × (Ts−T) −B × dT / dt where A and B are constants.

[0004]

However, in this case, when the heat capacity of the heat exchanger decreases and the dead time of the response increases, if the number of burners is increased as it is, the outlet water temperature overshoots, and There was an inconvenience of being caught in the limit.

[0005] In view of the above circumstances, an object of the present invention is to provide a hot water heating apparatus that can avoid overshoot of the outlet water temperature of a heat exchanger.

[0006]

In the present invention, attention has been paid to the fact that the demand for the outlet water temperature of the heat exchanger and its responsiveness is not so severe in the hot water heating apparatus.

That is, the present invention includes a plurality of burners for heating a heat exchanger, a hot water outgoing pipe and a hot water return pipe for circulating hot water between the heat exchanger and a radiator, and comprises a set temperature and the hot water return pipe. In a hot water heating apparatus, the number of combustions of the burners is adjusted to change the amount of heat supplied to the heat exchanger based on a temperature difference from an outlet water temperature of the heat exchanger and a temperature gradient of the outlet water temperature. Temperature detecting means for detecting the outlet water temperature of the heat exchanger, determining means for determining whether or not the outlet water temperature of the heat exchanger is increasing, and supplying the heat exchanger to the heat exchanger when the outlet water temperature is increasing. While increasing the contribution rate of the temperature gradient of the outlet water temperature when setting the amount of heat, the temperature gradient of the outlet water temperature when setting the amount of heat supplied to the heat exchanger when the outlet water temperature does not tend to increase. Reduce contribution Constituted by providing a contribution ratio setting means.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the hot water heating apparatus according to the present invention, and FIG. 2 is a control block diagram of a control unit of the hot water heating apparatus shown in FIG.

As shown in FIG. 1, a hot water heating apparatus 1 according to the present invention has a heat exchanger 2 for heating hot water for heating, and two burners 13a and 13b are provided below the heat exchanger 2.
Is installed. A hot water circulation pipe 3 is connected to the heat exchanger 2 so as to communicate the water inlet 2 a and the high temperature section 2 b, and an expansion tank 4 is provided in the middle of the hot water circulation pipe 3. A hot water circulation pump 5 is provided downstream of the expansion tank 4, and a blower fan 6 is installed above the heat exchanger 2. Further, a hot water circulating pipe 8 is connected to the hot water circulating pipe 3 so as to branch off from the vicinity of the high temperature portion 2b of the heat exchanger 2. The air heater 7 is connected. A hot water circulation pump 5 is connected to the hot water circulation pipe 3.
A hot water outgoing pipe 10 is connected so as to branch off from the downstream side, and a hot water mat 9 installed in a room is connected to a tip of the hot water outgoing pipe 10. A hot water return pipe 11 is provided between the hot air heater 7 and the hot water mat 9 and the hot water circulation pipe 3 so as to be branched from the upstream side of the expansion tank 4. Is equipped with a capillary tube 16. Further, a high-temperature hot-water temperature detector 14 is attached to the high-temperature portion 2 b of the heat exchanger 2, and a low-temperature hot-water temperature detector 15 is attached upstream of the hot-water circulation pump 5.

The hot water heating apparatus 1 includes a control unit 1
2 is incorporated, and the control unit 12 has a microcomputer 20 as shown in FIG. The microcomputer 20 incorporates a judging means 21 and a contribution rate setting means 22, and the high-temperature hot water temperature detector 14, the low-temperature hot water temperature detector 15, the hot water circulation pump 5, the blowing fan 6, The burners 13a and 13b are connected.

Since the hot water heating apparatus 1 according to the present invention has the above configuration, the operation of the hot water heating apparatus 1 is performed as follows under the control of the microcomputer 20.

That is, when the hot water circulation pump 5 is driven, the hot water circulates in the hot water circulation pipe 3 and is heated by the burners 13 a and 13 b when passing through the heat exchanger 2.
After being supplied to the hot air heater 7 via the hot water outflow pipe 8 and radiating heat by the hot air heater 7, it returns to the hot water circulation pipe 3 via the hot water return pipe 11. In addition, the hot water before passing through the heat exchanger 2 is supplied to the hot water mat 9 via the hot water outflow pipe 10 and radiated by the hot water mat 9, and then to the hot water circulation pipe 3 via the hot water return pipe 11. Return.

At this time, the high temperature hot water temperature detector 14 always detects the outlet water temperature T of the heat exchanger 2 and exchanges heat with the set temperature Ts inputted through a predetermined input means (not shown). From the temperature difference (Ts-T) from the outlet water temperature T of the heat exchanger 2 and the temperature gradient dT / dt of the outlet water temperature T, the heat quantity dQ supplied to the heat exchanger 2 is calculated and set based on the equation shown in Equation 1. Then, the heating power of the burners 13a and 13b is determined from the supplied heat amount dQ. Here, the microcomputer 20 performs a parameter operation on the control, and A in Equation 1 is a constant, but B is a variable depending on whether or not the outlet water temperature T of the heat exchanger 2 tends to increase. Thus, the heating operation is controlled via the determination means 21 and the contribution rate setting means 22 so that the outlet water temperature T of the heat exchanger 2 does not overshoot.

That is, the determination means 21 determines the outlet water temperature T
Is determined to be on the rise. To do so, a temperature gradient dT / dt of the outlet water temperature T of the heat exchanger 2 is calculated, and if this temperature gradient dT / dt is positive, it is determined that the temperature gradient dT / dt is increasing, and this temperature gradient dT / dt is zero or negative. If so, it is determined that there is no upward tendency.

As a result, when it is determined that the outlet water temperature T of the heat exchanger 2 is on the rise, the contribution ratio setting means 22
When setting the supply heat quantity dQ described above, B
To increase. Then, the temperature gradient dT / d of the outlet water temperature T
t increases, and the supplied heat quantity dQ increases or decreases sensitively to the change in the temperature gradient dT / dt.
It is possible to avoid a situation where the outlet water temperature T overshoots even if the heat capacity of the outlet water decreases.

Conversely, if it is determined that the outlet water temperature T of the heat exchanger 2 does not tend to increase, the outlet water temperature T is constant or tends to decrease, and there is no possibility that overshoot will occur. The contribution ratio setting means 22 reduces B in Equation 1 when setting the supply heat amount dQ described above. Then, the contribution rate of the temperature gradient dT / dt of the outlet water temperature T decreases, and the temperature difference (Ts-T) between the set temperature Ts and the outlet water temperature T
, The responsiveness of the outlet water temperature T is improved.

[0017]

As described above, according to the present invention, a plurality of burners for heating a heat exchanger and hot water between the heat exchanger and a radiator such as a hot air heater or a hot water mat are provided. A hot water return pipe and a hot water return pipe for circulation, and based on a temperature difference between a set temperature and an outlet water temperature of the heat exchanger and a temperature gradient of the outlet water temperature, adjust the number of burners of the burner to adjust the heat exchange. In a hot water heating apparatus that changes the amount of heat supplied to the heat exchanger, a temperature detecting means such as a high-temperature hot water temperature detector for detecting an outlet water temperature of the heat exchanger, and whether or not the outlet water temperature of the heat exchanger is increasing. Determining means for determining whether
When the outlet water temperature is increasing, the contribution of the temperature gradient of the outlet water temperature when setting the amount of heat supplied to the heat exchanger is increased, and when the outlet water temperature is not increasing, the heat exchange is performed. And the contribution rate setting means for reducing the contribution rate of the temperature gradient of the outlet water temperature when setting the amount of heat supplied to the heat exchanger, so that if the outlet water temperature of the heat exchanger tends to rise, the heat exchanger Since the amount of heat supplied to the heat exchanger increases and decreases sensitively, it is possible to provide a hot water heating apparatus that can avoid overshoot of the outlet water temperature of the heat exchanger. Furthermore, since it can be dealt with by operating parameters on the control,
It is cheaper and more economical than a mechanical solution.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a hot water heating device according to the present invention.

FIG. 2 is a control block diagram of a control unit of the hot water heating apparatus shown in FIG.

[Explanation of symbols]

 1 hot water heating device 2 heat exchanger 7 radiator (hot air heater) 8, 10 hot water outgoing pipe 9 radiator (hot water mat) 11 hot water return pipe 13a, 13b ... burner 14 ... temperature detecting means (temperature detector for high-temperature hot water) 21 ... determining means 22 ... contribution rate setting means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshiaki Kaneko 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Yoshinobu Koga 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 in Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A plurality of burners for heating a heat exchanger;
A hot water return pipe and a hot water return pipe for circulating hot water between the heat exchanger and the radiator; based on a temperature difference between a set temperature and an outlet water temperature of the heat exchanger and a temperature gradient of the outlet water temperature. A hot water heating device that changes the amount of heat supplied to the heat exchanger by adjusting the number of combustions of the burners; a temperature detecting unit that detects an outlet water temperature of the heat exchanger; and an outlet water temperature of the heat exchanger increases. Determination means for determining whether or not there is a tendency, while increasing the contribution rate of the temperature gradient of the outlet water temperature when setting the amount of heat supplied to the heat exchanger when the outlet water temperature is increasing, And a contribution rate setting means for reducing the contribution rate of the temperature gradient of the outlet water temperature when setting the amount of heat supplied to the heat exchanger when the outlet water temperature does not tend to increase. apparatus.