JPH05172395A - Control method in hot-water supply equipment - Google Patents

Abstract

PURPOSE:To obtain a control method, in which no time lag is generated in the control of the temperature of hot water to be discharged when a flow rate exceeding the capacity of a hot-water supply equipment is set. CONSTITUTION:The flow rate of hot water discharged is controlled previously by a control valve 4 on the basis of the temperature of introducing water and a set temperature, and the temperature of hot water discharged is controlled at the set temperature while conducting proportional control by a bypass flow control valve 3 and a heat exchanger side flow control valve 6 at the time of actual usage. Since the whole flow rate of hot water discharged is controlled previously by the control valve 4, no time lag is generated in the control of the temperature of hot water discharged even when a flow rate exceeding capacity during usage is set, thus improving facility.

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 a hot water discharge temperature and a water amount of an instantaneous hot water heater (hereinafter referred to as "hot water heater").

[0002]

2. Description of the Related Art In the case of a water heater, when the hot water temperature is set, the controller 5 operates to maintain the hot water temperature, as shown in FIG. The mixing ratio of cold water from the bypass 2 side is controlled by the bypass flow rate control valve 3, and the total amount of tap water is simultaneously controlled by the tap water amount control valve 4.

[0003]

For this reason, the outlet water temperature is maintained at a constant level in principle, but if the opening of the outlet tap is changed during use, the amount of outlet water changes. The operation of maintaining the set temperature by adjusting the gas amount is automatically performed. However, this control range is not a problem if it is within the range of the water heater capacity (input), but if, for example, the amount of tap water is set large and the tap water temperature is set high, the capacity of the water heater Is constant,
If temperature is prioritized, the amount of tap water will not reach the target water amount, and if priority is given to water amount, the temperature will not reach the target water temperature.

Therefore, in the prior art, the temperature of the hot water is prioritized, and the total amount of hot water discharged is controlled by the control valve 4 so as to reach this temperature. Then, a time delay occurs until the set hot water is obtained, and there is a problem that the usability is poor.

An object of the present invention is to provide a control method in which the above-mentioned time delay does not occur.

[0006]

The constitution of the present invention is as follows.

An instantaneous hot water supply having a structure in which the hot water temperature from the heat exchanger side and the cold water from the bypass side is controlled by a control valve to control the hot water temperature and the total hot water amount is controlled by the hot water amount control valve. In the vessel,
The total amount of hot water output is calculated by the set temperature, and the total hot water output control valve is controlled based on this value.
A control method for a water heater that controls only the mixing ratio of hot water from the heat exchanger side and cold water from the bypass side during use with each control valve.

[0008]

EXAMPLE FIG. 1 shows an example of the present invention. Reference numeral 1 is a heat exchanger, 2 is a bypass, 3 is a bypass flow rate control valve, 4 is a whole hot water flow rate control valve, 5 is a controller, and 6 is a heat exchanger side flow rate control attached to the outlet side of the heat exchanger 1. The valve 7 is an incoming water temperature sensor.

In the above-mentioned embodiment, the controller 5 detects the inlet water temperature by the sensor 7 in advance, calculates the total outlet flow rate from this value and the set temperature, and based on this value, the entire outlet flow control valve 4 Further, the bypass flow rate control valve 3 and the heat exchanger side control valve 6 are proportionally controlled to change the mixing ratio, and the tapping temperature is automatically controlled to a set temperature (usually within ± 3 ° C).

[0010]

As described above, according to the present invention, in the water heater, the total flow rate of hot water is controlled in advance, and only the temperature control is performed by the proportional control during actual use. Therefore, the flow rate can be detected during use. Since there is no need to control the flow rate of tapping water, there is no time delay as in the conventional case. As a result, a water heater with good usability can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view of a water heater according to the present invention.

FIG. 2 is an explanatory view of a conventional water heater.

[Explanation of symbols]

 1 Heat Exchanger 2 Bypass 3 Bypass Flow Control Valve 4 Overall Hot Water Flow Control Valve 5 Controller 6 Heat Exchanger Side Flow Control Valve 7 Inlet Water Temperature Detection Sensor

Claims (1)

[Claims] 1. An instant of a structure in which the outlet water temperature is controlled by controlling a mixing ratio of hot water from the heat exchanger side and cold water from the bypass side by a control valve and the total amount of outlet water is controlled by the outlet water amount control valve. In the hot water heater, the total amount of hot water discharged is determined in advance by the incoming water temperature and the set temperature, and the total hot water discharge control valve is controlled based on this value, and the hot water from the heat exchanger side is used during use. And a control method in a water heater in which only the mixing ratio of cold water from the bypass side is controlled by each control valve.