JPH04324057A - Controlling method for hot water storage type hat water supplying facility - Google Patents

Abstract

PURPOSE:To perform an economical operation of a boiler and to reduce a running cost by an energy conservation by previously learning a hot water supply load pattern, and automatically controlling a combustion output of the boiler according to the pattern and a present hot water storage amount. CONSTITUTION:A two-layer separation hot water storage type hot water supplying facility has a hot water reservoir 1 in which water is supplied from a lower section by a water supply tube 6 and hot water is supplied from an upper section through a hot water supply tube 3. The water is heated by a boiler 8 to become hot water, and stored in the reservoir 1 by a hot water supply tube 11. In this case, an automatic controller 13 learns and stores hot water supply load detected by hot water supply load detecting means 12 by a pattern as an aging change, and automatically so controls a combustion output of the boiler 8 according to the pattern and present hot water storage amount of the reservoir 1 as to be adapted for the pattern in an aging manner. The means 12 is so composed as to momentarily detect a flow rate of hot water from a hot water cock 2, and detects hot water storage amount 14 by providing a plurality of temperature sensors in height direction of the reservoir 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling hot water storage type hot water supply equipment.

0002

[Prior Art] As a conventional hot water storage type hot water supply system, as shown in Fig. 2 (
Those shown in A) and (B) are generally known.

First, (A) in FIG. 2 is a system that prevents the hot water in the hot water supply pipe (3) from the hot water storage tank (1) to the hot water tap (2) from cooling down before the next use. In order to do this, when the hot water is not in use, it is circulated through a return pipe (5) equipped with a pump (4) to maintain a high temperature state, and the next time the hot water is used, the hot water can be used. Water is supplied to the hot water tank (1) from a water supply pipe (6) depending on the amount of hot water used. When the temperature of the water in the hot water tank (1) falls below the set temperature of the temperature sensor (7), the boiler (8) is combusted and the pump (9) pumps the water in the hot water tank (1) to the boiler (8). ) is supplied to the hot water storage tank (
I am trying to return to 1). Further, when the temperature of the water in the hot water storage tank (1) exceeds the temperature set by the temperature sensor (7), the boiler (8) and pump (9) are stopped.

On the other hand, FIG. 2(B) shows a return pipe (5
) is not returned to the hot water storage tank (1), but is returned to the base of the hot water supply pipe (3) before the check valve (3a). However, the return pipe (5) is equipped with a heater (5a), In addition, water is supplied to the hot water tank (1) from the bottom, and water is supplied to the boiler (8) from the water supply pipe (6). Hot water and cold water are stored separately in the top and bottom, and hot water is supplied from the top. As hot water is used, the boundary between hot water and water lowers, and when the temperature sensor (7) set at an appropriate height of the hot water storage tank (1) detects a temperature below the set temperature, the boiler (8) is fired. That's what I do.

[0005]

[Problem to be Solved by the Invention] In the case shown in FIG. 2 (A), when the temperature in the hot water storage tank (1) falls below the set temperature (
(e.g. when water is supplied into the hot water storage tank (1) after hot water is used, or when low temperature hot water from the return pipe (5) gets mixed in)
, since the boiler (8) burns, it has the following disadvantages.

[0006] ■ The hot water temperature becomes unstable. ■ Heat is radiated from the hot water storage tank (1) and return piping (5) when not in use and when in use. ■ Boiler (8) ON/OFF
The efficiency is low because the number of times is large. In the case of FIG. 2(B), the above-mentioned points (1) and (2) are improved, but the disadvantage (2) is not improved.

[0007] In addition, in commercial water heating equipment, the daily hot water supply load pattern is often determined, but the conventional water heating equipment shown in FIGS.
), it does not match the load pattern and is wasteful, leading to high running costs.

The object of the present invention is to improve the above-mentioned disadvantages of conventional hot water storage type equipment.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a hot water storage tank in which water is supplied from the lower part, hot water is stored in two layers, hot water is stored in the upper part, and water is stored in the lower part, and hot water is supplied from the upper part. In hot water storage type hot water equipment equipped with a boiler that heats water taken out from the lower part of the hot water storage tank and supplies it to the upper part of the hot water storage tank, changes in hot water supply load over time are learned and memorized as a hot water supply load pattern, and this hot water supply load pattern is The combustion output of the boiler is controlled over time to suit the above pattern based on the current amount of hot water stored in the hot water storage tank.

0010

[Function] By automatically controlling the combustion output of the boiler in consideration of the current amount of hot water storage, the amount of hot water stored is minimized at the minimum load of the hot water supply load pattern, and the amount of hot water storage is maximized at the maximum load. While taking advantage of the advantages of hot water storage type water heating equipment, it eliminates waste, reduces running costs, and saves energy.

[0011]

[Example] Fig. 1 (A) is a schematic diagram of the entire hot water storage type hot water supply equipment according to the present invention, in which (1) is a hot water storage tank, (2) is a hot water tap, (3) is a hot water supply piping, ( 3a) is the check valve, (4) is the return pump, (5) is the return pipe, (5a) is the heater, (6) is the water supply pipe, (8) is the boiler, and (9) is the connection to the boiler (8). Water pump, (10) is boiler (
8), (11) is a hot water pipe that supplies hot water from the boiler (8) to the hot water storage tank (11), (12) is a hot water supply load detection means, and (13) is a hot water supply load detection means (12). The detected hot water supply load is stored as a pattern as a change over time, and the boiler (
8) shows a device that automatically controls combustion output over time.

[0012] The hot water storage tank (1) is supplied with water from the bottom through a water supply pipe (6), stores hot water in two layers on the upper side and water on the lower side, and hot water is supplied from the upper part through the hot water supply pipe (3). It is something. The hot water tap (2) is set at a desired position from the hot water pipe (3). A return pipe (5) is connected to the hot water supply pipe (3), and when the hot water is not in use, the return pump (4) circulates the hot water in the hot water supply pipe (3) to prevent it from cooling locally. .

The boiler (8) and the feed water pump (9) are automatically controlled by an automatic control device (13). The automatic control device (13) stores the hot water supply load detected by the hot water supply load detection means (12) as a pattern as a temporal change, and calculates the boiler ( 8) Automatically control combustion output over time. When the boiler (8) is being fired, the water pump (9) is also driven in conjunction.

[0014] The hot water supply load detection means (12) detects the hot water supply tap (2).
This device detects the flow rate of hot water from the hot water tap ( ) every moment.
2), or the flow rate of the hot water supply pipe (3) can be detected only when the hot water tap (2) is opened. Further, the current amount of hot water stored in the hot water storage tank (14) is detected by, for example, a plurality of temperature sensors installed in the height direction of the hot water storage tank (1).

FIG. 1(B) is an example showing the change over time in the hot water supply load, and FIG. 1(C) shows the change over time in the combustion output of the boiler (8) for such a hot water supply load. The change over time in the amount of hot water stored in the hot water tank (1) at that time is shown in FIG. 1(D). The combustion output of the boiler (8) can also be controlled in an analog way, and
It may be controlled digitally in several stages. In any case, in order to correspond to the hot water supply load pattern, the amount of hot water stored in the hot water storage tank (1) is maximized at the maximum load, and the boiler (8) is made to continue operating at the minimum combustion output even at the minimum load. It is preferable to do so. This allows, for example, to memorize changes in the daily hot water supply load over time and automatically control the combustion output of the boiler (8) based on the previous day's pattern or the average pattern over several days and the current amount of hot water storage. It is something. Note that the hot water supply load pattern is corrected periodically or when necessary.

[0016]

[Effects of the Invention] According to the present invention, the hot water supply load pattern is learned in advance and the boiler combustion output is automatically controlled based on this pattern and the current amount of hot water storage. The boiler can be operated economically to match the hot water supply load pattern while taking advantage of the
It can save energy and reduce running costs.

[Brief explanation of drawings]

FIG. 1: (A) is a schematic diagram of the entire hot water storage type hot water supply equipment according to the present invention; (B) is a graph showing an example of a hot water supply load pattern;
(C) is a graph showing an example of controlling the combustion output of the boiler according to the present invention, and (D) is a graph showing the change in the amount of hot water stored at that time.

FIGS. 2(A) and 2(B) both show schematic diagrams of the entire conventional hot water storage type hot water supply equipment.

[Explanation of symbols] 1 Hot water storage tank 2 Hot water tap 3 Hot water piping 6 Water supply pipe 8 Boiler 12 Hot water supply load detection means 13 Automatic control device 14　Hot water storage amount detection means

Claims (1)

[Claims] [Claim 1] A hot water storage tank that supplies water from the bottom, stores hot water in two layers on the top and water on the bottom, and supplies hot water from the top;
In hot water storage type hot water equipment equipped with a boiler that heats water taken out from the lower part of the hot water storage tank and supplies it to the upper part of the hot water storage tank, changes in hot water supply load over time are learned and memorized as a hot water supply load pattern, and this hot water supply load pattern and A method of controlling a hot water storage type hot water supply equipment, characterized in that the combustion output of a boiler is controlled over time to suit the above pattern based on the current amount of hot water stored in a hot water storage tank.