JP2519714B2 - Hot water heater - Google Patents

Description

The present invention relates to a hot water heating device that uses hot water as a heat exchange medium, and more particularly to a hot water heating device with an improved hot water supply system.

(Prior Art) FIG. 5 shows a system configuration of a conventional general hot water heating device.

A main heat exchanger 3 and a backup heat exchanger 4 are sequentially provided as a primary heat exchanger for heating hot water in a closed loop hot water pipe 2 having a pump 1, and a plurality of indoor water heating units are provided at predetermined portions of the hot water pipe 2. The secondary heat exchangers 5 are connected in parallel via the hot water flow rate control valves 6, respectively.

The main heat exchanger 3 and the backup heat exchanger 4 are tubular heat exchangers, and the main heat exchanger 3 supplies hot water for heating by hot waste water supplied from a heat facility (not shown) through the hot waste water pipe 7. It is constantly heated, and the backup heat exchanger 4 is started by the steam supplied from a boiler or the like (not shown) through the steam pipe 8 when the heat equipment is stopped.

By the way, in the conventional hot water heating device, the temperature of the hot water supplied from the primary heat exchanger to the secondary heat exchanger is controlled to a constant value by the temperature control means. That is, the hot water temperature detector 9 provided in the hot water pipe 2 detects the hot water temperature, and the output signal is supplied by the signal cable 10 to the bypass flow control valve 12 of the main heat exchanger bypass pipe 11 provided in the hot water pipe 2 or the backup. Steam piping 8 to heat exchanger 4
This is fed back to the steam flow rate control valve 13 to adjust the hot water flow rate and the steam flow rate to control the hot water temperature to a constant value.

(Problems to be Solved by the Invention) In the conventional hot water type heating device, the hot water supply temperature is controlled to be constant. For example, as shown in FIG. 6, the hot water supply temperature does not change even if the outside air temperature changes. . Therefore, in order to obtain the heating effect according to the outside air temperature, the hot water supply amount to each secondary heat exchanger 5 is adjusted by the hot water flow rate adjusting valve 6 on the upstream side as shown in FIG. There is. For this reason, it is necessary to provide a large number of hot water flow control valves 6 in the hot water pipe 2, resulting in a large installation space and troublesome maintenance.

The present invention has been made in view of such circumstances, it is possible to control the hot water supply temperature according to the outside air temperature, eliminating the need to install a hot water flow control valve for each secondary heat exchanger, space efficiency and It is an object of the present invention to provide a hot water type heating device capable of improving maintainability and the like.

[Structure of Invention]

(Means for Solving Problems) The present invention relates to a hot water pipe for circulating hot water, a primary heat exchanger for heating hot water provided in the hot water pipe, and a secondary heater for indoor heating connected to the hot water pipe. In a hot water heating device having a heat exchanger, as a means for controlling the hot water supply temperature to the secondary heat exchanger, the amount of heat exchange in the primary heat exchanger is low when the outside air temperature is high, and the outside air temperature is When the temperature is low, a heat exchange amount control device for controlling the temperature in an inversely proportional manner is provided. This heat exchange amount control device bypasses the outside air temperature detector for detecting the outside air temperature and the primary heat exchanger provided in the hot water pipe. It is characterized by including a bypass pipe and a bypass flow rate control valve provided in the bypass pipe for controlling the flow rate of hot water in the bypass pipe based on an output signal from the outside air temperature detector.

(Function) The temperature of the hot water supplied to the secondary heat exchanger for heating is controlled at the primary heat exchanger portion for heating, for example, when the outside air temperature is low, and when the outside air temperature is high, it is controlled to be low. .

Therefore, it is not necessary to provide a large number of hot water flow rate control valves corresponding to the secondary heat exchanger, and it is possible to reduce the installation space and facilitate maintenance.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, a main loop heat exchanger 23 and a backup heat exchanger 24 are sequentially installed as a primary heat exchanger for heating hot water in a closed loop hot water pipe 22 having a pump 21, and the hot water pipe 22 has a predetermined size. A plurality of secondary heat exchangers 25 for indoor heating are connected in parallel to the site.

The main heat exchanger 23 and the backup heat exchanger 24 are tubular heat exchangers, and the main heat exchanger 23 constantly heats the hot water for heating by the hot waste water supplied from a heat facility (not shown) through the hot waste water pipe 26. Further, the backup heat exchanger 24 is started by the steam supplied from a boiler or the like (not shown) through the steam pipe 27 when the heat equipment is stopped.

In this device, as a means for controlling the hot water supply temperature to the secondary heat exchanger 25, heat exchange for controlling the heat exchange amount in the main heat exchanger 23 and the backup heat exchanger 24 in inverse proportion to the outside air temperature. Quantity control devices 28 and 29 are provided respectively.

The heat exchange amount control device 28 of the main heat exchanger 23 is an outside air temperature detector 30 that detects the outside air temperature, a bypass pipe 31 that is provided in the hot water pipe 22 and bypasses the primary heat exchanger 23, and this bypass pipe 31. A bypass flow rate that controls the hot water flow rate in the bypass pipe 22 based on a signal that is provided via the signal cable 32 from the outside air temperature sensor 30 and the controller 30a that sets the valve opening degree according to the detected temperature. It is constituted by the control valve 33.

Further, the heat exchange amount control device 29 of the backup heat exchanger 24
Is the outside air temperature detector 30 and the controller 30a, and the outside air temperature detector 30 and the controller 30a from the outside air temperature detector 30 and the controller 30a to the signal cable 32 provided in the steam pipe 27 for supplying steam as the primary heating medium.
And a steam flow rate control valve 34 as a primary flow rate control valve for controlling the steam flow rate based on a signal output via the.

According to such a configuration, the temperature of the hot water supplied to the secondary heat exchanger 25 during the normal heating operation using the hot drainage is the same as the temperature of the hot water exchanged in the main heat exchanger 23 and the main heat exchanger 23. Water temperature and bypass valve as a bypass flow to bypass water
It is determined by the ratio of both hot water flow rates based on the opening of 33. In this case, by the output signal from the outside air temperature detector 30, the opening degree of the bypass flow rate control valve 33 is adjusted in proportion to the outside air temperature, the bypass flow rate increases when the outside air temperature is high, and the outside air temperature is low. The bypass flow rate is reduced, and the ratio of the amount of hot water exchanged with heat is adjusted. That is, the main heat exchanger 23
The amount of heat exchange is controlled in inverse proportion to the outside air temperature, so that the hot water supply temperature is set low when the outside air temperature is high and high when the outside air temperature is low, as shown in FIG. 2, for example. .

Therefore, since the hot water supply temperature to the secondary heat exchanger 25 automatically changes according to the outside air temperature, flow rate control on the side of the secondary heat exchanger 25 becomes unnecessary, and a plurality of hot water provided in the conventional device are not required. Since the flow control valve etc. can be omitted, the installation space can be reduced and the number of maintenance and inspection points can be reduced accordingly.

If hot wastewater cannot be used, the main heat exchanger 23
Instead, the backup heat exchanger 24 is started, but in this case, the steam flow rate to be used is controlled by the steam flow rate control valve 34 that operates in response to the output signal from the outside air temperature detector 30, thereby supplying hot water. The temperature is controlled according to the outside air temperature, as in FIG.

In the above embodiment, as the primary heat exchanger, the main heat exchanger 23 using hot waste water and the backup heat exchanger using steam are used.
Although it has been configured to have two heat exchangers 24 and 24, it is also possible to have a configuration having only one heat exchanger of either type. Further, in this case, the configuration of the heat exchange amount control device can be reversed from that of the above embodiment.
FIG. 3 shows a reference example, and FIG. 4 shows an application example.

FIG. 3 shows that a primary heat exchanger 35 using warm waste water is provided, and a warm waste water flow rate adjusting valve 37 is provided in the warm waste water piping 36, and a heat exchange amount control device 38 is configured by using this warm waste water flow rate adjusting valve 37. It was done.

Further, in FIG. 4, a primary heat exchanger 39 using steam is provided, a bypass flow rate control valve 41 is provided in the bypass pipe 40, and a heat exchange flow rate control device 42 is configured using the bypass flow rate control valve 41. Is. 43 indicates a steam pipe.

In FIGS. 3 and 4, the configuration other than the above is the same as that of FIG. 1, and therefore, corresponding parts are designated by the same reference numerals and the description thereof is omitted.

The functions and effects similar to those described above can also be obtained by the ones shown in FIGS. 3 and 4.

Although a total of four configurations of the primary heat exchanger with the heat exchange flow rate control device have been described above (23, 24, 35, 39), it is needless to say that these can be used in combination in any number and arrangement.

〔The invention's effect〕

As described above, according to the present invention, the heat exchange amount control device for the primary heat exchanger controls the hot water supply temperature itself to the secondary heat exchanger according to the outside air temperature. An appropriate heating effect can be obtained without providing a hot water flow rate control valve for each exchanger, and there is an effect that space efficiency and maintainability can be improved by omitting the hot water flow rate control valve.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, FIG. 2 is a graph showing its characteristics, FIG. 3 is a system diagram showing a reference example, and FIG.
FIG. 5 is a system diagram showing another embodiment, FIG. 5 is a system diagram showing a conventional example, and FIG. 6 is a graph showing its characteristics. 22 …… Hot water piping, 23,24,35,39 …… Primary heat exchanger, 25…
… Secondary heat exchanger, 28,29,38,42 …… Heat exchange amount control device, 3
0 …… Outside temperature detector, 31,40 …… Bypass piping, 33,41
...... Bypass flow control valve

Claims (3)

(57) [Claims] 1. A hot water heating system comprising: a hot water pipe for circulating hot water; a primary heat exchanger for heating hot water provided in the hot water pipe; and a secondary heat exchanger for indoor heating connected to the hot water pipe. In the device, as a means for controlling the hot water supply temperature to the secondary heat exchanger, the amount of heat exchange in the primary heat exchanger is low when the outside air temperature is high, and high when the outside air temperature is low, and inversely proportionally. A heat exchange amount control device for controlling is provided, and this heat exchange amount control device is provided with an outside air temperature detector for detecting the outside air temperature, a bypass pipe provided in the hot water pipe and bypassing the primary heat exchanger, and this bypass pipe. And a bypass flow rate control valve for controlling the flow rate of hot water in the bypass pipe based on the output signal from the outside air temperature detector. 2. The primary heat exchanger is a heat exchanger using hot waste water or steam as a heating medium, and the heat exchange amount control device includes an outside air temperature detector for detecting an outside air temperature and the hot waste water or steam. A primary flow control valve which is provided in a heating medium supply pipe for supplying to a primary heat exchanger and which controls a flow rate of hot waste water or steam based on an output signal from the outside air temperature detector. The hot water heating device according to item 1. 3. The hot water heating apparatus according to claim 1, wherein the primary heat exchanger comprises a main heat exchanger using hot waste water as a heating medium and a backup heat exchanger using steam as a heating medium. .