JPH06347093A - Method of controlling temperature in hot-water space heater - Google Patents

Abstract

PURPOSE:To prolong the service life of the devices of a hot-water space heater and save electric charges. CONSTITUTION:When a hot-water space heater is operated so that a hot water temperature is maintained at a level (for example, Ps+ or -5 deg.C) close to a predetermined set temperature Ps, a differential on a plus side is set to a higher level (for example, +10 deg.C) for a given period of time DELTAT (for example, ten minutes) after the ignition of a burner. Accordingly, the number of times of an ON/OFF cycle during the operation of the hot-water space heater is reduced, whereby the life of the devices of the hot-water space heater can be prolonged even in the case of a small load, and electric charges for an electric heater for igniting the burner are economized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control method for a hot water heater, which can extend the life of the equipment and save the electricity bill.

[0002]

2. Description of the Related Art FIG. 4 is a graph showing an example of a conventional temperature control method for a hot water heater.

Conventionally, the following temperature control method has been widely used as a method for maintaining the hot water temperature near a predetermined set temperature Ps during the operation of the hot water heater.

That is, as shown in FIG. 4, when the temperature of the hot water reaches a temperature higher than the set temperature Ps by 5 ° C. (Ps + 5 ° C.), the combustion of the burner is interrupted to prevent further temperature rise, and thereafter, When the temperature of the hot water reaches a temperature lower than the set temperature Ps by 5 ° C (Ps-5 ° C), the electric heater is used again to ignite the burner to prevent the temperature from further lowering. The hot water temperature was controlled to be maintained within the range of the set temperature Ps ± 5 ° C. by repeating the cycle).

[0005]

However, in this case, the ON / OFF cycle is frequently repeated especially when the load is small, which not only shortens the life of the equipment but also vaporizes and burns the liquid fuel. In the case of using the burner, the electric heater is used every time the burner is ignited, so that there is a disadvantage that the electric bill is required accordingly.

In view of the above circumstances, the present invention changes the differential only for a fixed time after the burner is ignited, thereby reducing the number of ON / OFF repetitions even under a small load to prolong the life of the equipment and to reduce the electric power consumption. An object of the present invention is to provide a temperature control method for a hot water heater that can save money.

[0007]

[Means for Solving the Problems] That is, the present invention provides a hot water flow path (3, 5, 11), a pump (10) for circulating hot water along the hot water flow path, and an intermediate part of the hot water flow path. A heat exchanger (7) provided in the heat exchanger, an evaporative burner (9) for heating the heat exchanger, and an electric heater (8) for heating the burner.
And a temperature setting means (16) for setting the temperature of the hot water circulating along the hot water flow path, and the temperature of the hot water circulating along the hot water flow path is set by the temperature setting means. When the hot water heater (1) whose temperature is controlled so as to be maintained within a predetermined differential range near (Ps) is operated, the differential is increased to the positive side for a certain period (ΔT) after ignition of the burner. Is configured to.

[0008]

According to the present invention, the differential becomes large on the plus side for the fixed time (ΔT) after the burner (9) is ignited. Therefore, the ON / OFF cycle during operation of the hot water heater (1) is increased. Acts to reduce the number of times.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a graph showing an embodiment of a temperature control method for a hot water heater according to the present invention, FIG. 2 is a schematic diagram showing an example of the hot water heater, and FIG. 3 is a controller for the hot water heater shown in FIG. It is a control block diagram of.

As shown in FIG. 2, the hot water heater 1 has a heat source device 2, and the heat source device 2 has a forward pipe 3 and a return pipe 5.
A plurality of (three in FIG. 2) floor panels 6 are connected via the. The heat source device 2 is composed of a heat exchanger 7, an electric heater 8, a burner 9, a pump 10, a connecting pipe 11, a temperature sensor 12, and the like. That is, a heat exchanger 7 is provided at a substantially central portion of a connecting pipe 11 that connects the forward pipe 3 and the return pipe 5, and a liquid fuel such as kerosene is vaporized below the heat exchanger 7. A burner 9 incorporating an electric heater 8 is installed. Further, a pump 10 is provided in the connecting pipe 11 portion closer to the return pipe 5 than the heat exchanger 7, and a temperature sensor 12 is attached to the connecting pipe 11 portion closer to the forward pipe 3 than the heat exchanger 7. ing.

A microcomputer 13 is incorporated in the heat source device 2, and an operation switch 15, a temperature setter 16 and the temperature sensor 12 are connected to the input side of the microcomputer 13 as shown in FIG. The burner 9 and the pump 10 are connected to the output side of the microcomputer 13.

Since the hot water heater 1 has the above-described structure, when the operation switch 15 is turned on to operate the hot water heater 1, the microcomputer 13 drives the pump 10 to move the forward pipe 3 and the return pipe 5. The water inside the connecting pipe 11 is circulated between each floor panel 6 and the electric heater 8 is used to ignite the burner 9 while heating the heat exchanger 7 while vaporizing the fuel. Then, the forward pipe 3 and the return pipe 5
The water inside the connection pipe 11 is heated when passing through the heat exchanger 7 to become hot water, and the hot water is supplied to each floor panel 6 to perform floor heating.

At this time, the hot water supplied to each floor panel 6 is controlled so as to be maintained in the vicinity of the set temperature Ps set by the temperature setter 16. The temperature control is performed by the method described below. .

That is, as shown in FIG. 1, when setting the differential that determines the allowable range of the hot water temperature, the negative differential is always -5 ° C, and the positive differential is, in principle, + 5 ° C. , A certain time Δ after ignition of the burner 9 including the start of operation
Exceptionally, T (for example, 10 minutes) is set to + 10 ° C.

Then, the hot water temperature starts to rise by the start of operation, but when the time T exceeds a certain time T1, it exceeds the set temperature Ps + 5 ° C. However, at this time, since the differential on the plus side is + 10 ° C., the combustion of the burner 9 continues without interruption. After that, the rise of the hot water temperature slows down and is maintained between the set temperature Ps + 5 ° C. and the set temperature Ps + 10 ° C. At this time, the maximum temperature difference between the hot water temperature and the set temperature Ps is + 10 ° C., but since it is immediately after the start of operation when rapid heating is desired, it is rather preferable for the user to be higher than the set temperature Ps. That is.

Then, the time T is a certain time T2 (= ΔT)
When the temperature reaches, the differential on the plus side decreases from + 10 ° C. up to then to + 5 ° C., so that the combustion of the burner 9 is interrupted. As a result, the hot water temperature begins to drop, but when the time T reaches a certain time T3, the burner 9 is ignited again to heat the heat exchanger 7. Then, the warm water temperature starts to rise again, but at this time also, the time T is a certain time T4 (=
Until reaching (T3 + ΔT), the differential on the positive side is set to + 10 ° C, so after that ON / O
The FF cycle is not frequently repeated.

In this way, by setting the differential on the plus side to a high value of + 10 ° C. for a fixed time ΔT after ignition of the burner 9, ON / ON during operation of the hot water heater 1
The number of OFF cycles is reduced, so the hot water heater 1
In addition to extending the service life of the equipment constituting the above, the electricity cost of the electric heater 8 can be reduced.

In the above-mentioned embodiment, when setting the differential on the plus side, in principle, this is set to + 5 ° C., and this is set to + 10 ° C. for a fixed time ΔT after ignition of the burner 9. But this + 5 ℃
And + 10 ° C does not mean that the value itself has any special technical meaning. That is, the gist of the present invention is that the differential is set to a large value on the plus side for a fixed time ΔT after ignition of the burner 9, and specific numerical values may be appropriately determined according to various conditions. .

[0020]

As described above, according to the present invention,
A hot water flow path such as the outflow pipe 3, the return pipe 5, and the connecting pipe 11, a pump 10 for circulating hot water along the hot water flow path, a heat exchanger 7 provided in the middle of the hot water flow path, From a vaporization type burner 9 that heats the heat exchanger 7, an electric heater 8 that heats the burner 9, and temperature setting means such as a temperature setting device 16 that sets the temperature of the hot water circulating along the hot water flow path. Then, the hot water heater 1 that controls the temperature so that the temperature of the hot water circulating along the hot water flow path is maintained within a predetermined differential range near the set temperature Ps set by the temperature setting means is operated. At this time, since the differential is set to be larger on the plus side for a fixed time ΔT (for example, 10 minutes) after the ignition of the burner 9, the differential on the plus side is set for the fixed time ΔT after the ignition of the burner 9. Since it becomes higher, the number of ON / OFF cycles during the operation of the hot water heater 1 decreases,
It is possible to provide a temperature control method for the hot water heater 1 that can extend the life of the device even when the load is small and save the electricity cost of the electric heater 8.

[Brief description of drawings]

FIG. 1 is a graph showing an embodiment of a temperature control method for a hot water heater according to the present invention.

FIG. 2 is a schematic diagram showing an example of a hot water heater.

FIG. 3 is a control block diagram of a controller for the hot water heater shown in FIG. 2.

FIG. 4 is a graph showing an example of a conventional temperature control method for a hot water heater.

[Explanation of symbols]

 1 …… Hot water heater 3 …… Hot water flow path (outgoing pipe) 5 …… Hot water flow path (return pipe) 7 …… Heat exchanger 8 …… Electric heater 9 …… Burner 10 …… Pump 11 …… Hot water flow Line (connecting pipe) 16 ... Temperature setting means (temperature setter) Ps ... Set temperature ΔT ... Constant time

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Ieda 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A hot water flow path, a pump for circulating hot water along the hot water flow path, a heat exchanger provided in the middle of the hot water flow path, and an evaporative burner for heating the heat exchanger. An electric heater for heating the burner, and a temperature setting means for setting the temperature of the hot water circulating along the hot water passage, wherein the temperature setting means controls the temperature of the hot water circulating along the hot water passage. When operating a hot water heater that controls the temperature so as to maintain it within a predetermined differential range in the vicinity of the set temperature, the differential was set to a large positive side for a certain period after ignition of the burner. A method for controlling the temperature of a hot water heater.