JPH11281069A - Heat exchanging unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deliver hot water immediately at the time of use by comparing a detected temperature with lowest and highest reference level, temperature delivering a valve open or close command signal, respectively, when the detected temperature is lower than the lowest reference level temperature or higher than the highest reference level temperature thereby sustaining the temperature of hot supply water in a heat exchanger at a specified level temperature or above. SOLUTION: After temperature of heat exchanger 4 is detected by a temperature thermister 12, a decision unit 34 makes a decision whether the detected temperature is lower than a lowest reference level temperature or not according to a temperature keeping control program. If it is higher than a lowest reference level, temperature the control is returned to the temperature keeping control program, otherwise the control is entered, and a valve open command signal is delivered. A valve 3 is thereby opened to start circulation of heat medium between a heat source machine and a heat exchanger unit 7 thus delivering hot water immediately at the time of use while preventing useless heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange unit suitable for use in a heating system for supplying hot water to each house.

[0002]

2. Description of the Related Art Conventionally, in this type of heat exchange unit, a heating medium is supplied after a flow rate of hot water is detected to heat hot water.

[0003]

However, this requires a time to heat the heat exchanger and the hot water inside the heat exchanger at the time of starting hot water supply, and there is an inconvenience that a delay occurs until the desired hot water temperature is reached. .

SUMMARY OF THE INVENTION [0004] In view of the above circumstances, an object of the present invention is to provide a heat exchange unit that can immediately supply hot water when used.

[0005]

That is, the present invention relates to a heat exchange unit including a heat exchanger to which a heat medium is supplied from a heat source device via a heat medium feed pipe, and wherein an open / close valve is provided in the heat medium feed pipe. A temperature measuring means for measuring the temperature of the heat exchanger, and comparing the temperature detected by the temperature measuring means with a minimum reference temperature and a maximum reference temperature. A discriminator that outputs a signal and issues a valve closing command signal when the temperature is equal to or higher than the maximum reference temperature, and the temperature of the hot water in the heat exchanger is maintained at a predetermined temperature or higher by heating with a heat medium. It is composed.

[0006] The present invention is also provided with operating means for operating the discriminator.

Further, the present invention is configured by disposing the operation means on an operation panel.

[0008]

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

FIG. 1 is an explanatory view showing a heating system, FIG. 2 is a piping diagram showing an embodiment of a heat exchange unit according to the present invention, and FIG.
5 is a flowchart illustrating an example of a heat retention control program.

[0010] As shown in FIG.
3, and the heat source device 33 includes a burner 1 and a circulation pump 2. A plurality of heat exchanger units 7 according to the present invention are connected in parallel to the heat source unit 33 via a heat medium supply pipe 8 and a heat medium return pipe 9.

As shown in FIG. 2, each heat exchanger unit 7 is provided with a heat exchanger 4, and the heat medium feed pipe 8 is connected to a primary inlet of the heat exchanger 4 via an on-off valve 3. However, the heat medium return pipe 9 is connected to the primary side outlet. On the other hand, a water supply pipe 10 is connected to a secondary-side inlet of the heat exchanger 4 via a water governor 16 and a hot-water supply flow sensor 15, and a hot-water supply pipe 18 is connected to a secondary-side outlet via a mixing valve 17. Are connected. The temperature exchanger 12 is attached to the heat exchanger 4, and a discriminator 34 is connected to the temperature thermistor 12. Further, a control unit 13 such as a microcomputer is incorporated in each heat exchanger unit 7.

Since the heating equipment has the above configuration, when a hot water supply switch (not shown) is turned on to supply hot water, the control unit 13 executes a hot water supply operation described below.

First, the burner 1 is burned, the circulating pump 2 is driven, and the on-off valve 3 is opened. Then, the heat medium heated by the burner 1 is supplied from the heat source unit 33 to the heat medium feed pipe 8.
After reaching the heat exchanger 4 via the opening and closing valve 3 and heating the heat exchanger 4, the heat exchanger 4 returns to the heat source device 33 via the heat medium return pipe 9.
And the hot water flows from the water supply pipe 10 to the heat exchanger 4,
Then, after the temperature is raised, the hot water is supplied through the mixing valve 17 and the hot water supply pipe 18.

At this time, the control unit 13 executes the heat retention control program PRG1 shown in FIG.
4 is operated to keep hot water warm. That is, at step S1 of the heat retention control program PRG1, it is determined whether or not the heat exchanger unit 7 is operating. If it is determined that the heat exchanger unit 7 is operating, the heat source unit 33 The heat medium has already circulated between the exchanger unit 7 and
Since it is considered that the temperature t1 of the heat exchanger 4 has exceeded the predetermined minimum reference temperature t3 (for example, t3 = 30 ° C.), the process proceeds to step S2 of the heat retention control program PRG1, and normal operation control is performed.

On the other hand, if it is determined that the heat exchanger unit 7 is not operating, the discriminator 34 is instructed to execute a heat retaining operation. In response to this, the discriminator 34 sets the temperature thermistor 1 in step S3 of the heat retention control program PRG1.
2, the temperature t1 of the heat exchanger 4 is detected, and in step S4 of the heat retention control program PRG1, the temperature t1 is detected.
Is lower than or equal to the minimum reference temperature t3. As a result, when it is determined that the temperature t1 of the heat exchanger 4 exceeds the minimum reference temperature t3, the heat retention control program PRG
Returning to step S3 of step 1, if it is determined that the temperature t1 of the heat exchanger 4 is equal to or lower than the minimum reference temperature t3, the process proceeds to step S5 of the heat retention control program PRG1 to output a valve opening command signal. Then, the on-off valve 3 opens, and the heat medium starts to circulate between the heat source unit 33 and the heat exchanger unit 7, so that
Hot water in the heat exchanger 4 is heated and maintained at a predetermined temperature or higher. Therefore, hot water can be immediately supplied at the time of use, and comfort is excellent.

Further, the discriminator 34 enters step S6 of the heat retention control program PRG1 and enters the temperature thermistor 12
After the temperature t2 of the heat exchanger 4 is detected, it is determined in step S7 of the heat retention control program PRG1 whether the temperature t2 is equal to or higher than a predetermined maximum reference temperature t4 (for example, t4 = 35 ° C.). As a result, when it is determined that the temperature t2 of the heat exchanger 4 is lower than the maximum reference temperature t4, the process returns to step S6 of the heat retention control program PRG1, and the temperature t2 of the heat exchanger 4 is higher than the maximum reference temperature t4. If it is determined that there is, a step S8 of the heat retention control program PRG1 is entered, and a valve closing command signal is output. Then, the on-off valve 3 is closed, and the heat source unit 33 and the heat exchanger unit 7 are closed.
Then, the circulation of the heat medium between the heat treatment and the heat treatment ends, so that wasteful heating can be prevented, and the economy can be improved.

In the above embodiment, the case where the discriminator 34 operates in response to a signal from the control unit 13 has been described. However, operating means such as a discrimination switch are provided separately from the control unit 13. By this operation means, the discriminator 3
By manually operating 4, it is possible to cope with a case where hot water is not required, such as in summer, and it is possible to contribute to energy saving. At this time, this operation means
If provided on an operation panel on which various switches are provided, operability and convenience are excellent.

[0018]

As described above, according to the present invention, a heat exchanger provided with a heat exchanger to which a heat medium is supplied from a heat source device via a heat medium feed pipe, and an open / close valve provided on the heat medium feed pipe. In the unit, a temperature measuring means such as a temperature thermistor for measuring the temperature of the heat exchanger, and a temperature detected by the temperature measuring means is compared with a minimum reference temperature and a maximum reference temperature. A discriminator that issues a valve opening command signal for the on-off valve and issues a valve closing command signal for the on-off valve when the temperature is equal to or higher than the maximum reference temperature, and determines the temperature of hot water in the heat exchanger by heating with a heat medium. Since the temperature of the heat exchanger is maintained at or above the temperature, the heat medium is circulated when the temperature of the heat exchanger is equal to or lower than the minimum reference temperature, and is circulated when the temperature of the heat exchanger is equal to or higher than the maximum reference temperature. By stopping, It is possible to provide a heat exchange unit which enables immediate hot water at the time of use while preventing spoiled heating.

Further, according to the present invention, since the operating means for operating the discriminator is provided, it is possible to provide a heat exchange unit which can contribute to energy saving in addition to the above-mentioned effects.

Further, according to the present invention, since the operation means is arranged on the operation panel, it is possible to provide a heat exchange unit which is excellent in operability and convenience in addition to the effects described above.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a heating facility.

FIG. 2 is a piping diagram showing one embodiment of the heat exchange unit according to the present invention.

FIG. 3 is a flowchart illustrating an example of a heat retention control program.

[Explanation of symbols]

 3 Opening / closing valve 4 Heat exchanger 7 Heat exchanger unit 8 Heat medium feed pipe 12 Temperature thermistor (temperature measuring means) 33 Heat source unit 34 Discriminator t1, t2 Heat exchanger temperature t3: minimum reference temperature t4: maximum reference temperature

Claims (3)

[Claims] 1. A heat exchange unit comprising a heat exchanger to which a heat medium is supplied from a heat source device via a heat medium feed pipe, and wherein an open / close valve is provided in the heat medium feed pipe, wherein the temperature of the heat exchanger is measured. Temperature measuring means, and a temperature detected by the temperature measuring means is compared with a minimum reference temperature and a maximum reference temperature. When, a discriminator that issues a valve closing command signal of the on-off valve is provided,
A heat exchange unit, wherein the temperature of hot water in the heat exchanger is maintained at a predetermined temperature or higher by heating with a heat medium. 2. The heat exchange unit according to claim 1, further comprising operating means for operating the discriminator. 3. The heat exchange unit according to claim 2, wherein the operation means is provided on the operation panel.