JPH0387562A - Storage type hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To avoid excessive heating by a method wherein a water level sensor and a temperature sensor are equipped in a hot water storage tank, a load completion signal input device is provided as well, and heat source operation time for tomorrow is estimated according to the residual hot-water heat storage amount detected by the water level sensor and the temperature sensor when the load completion signal is input. CONSTITUTION:When a user inputs a load completion signal by a load completion signal input device 10, a water temperature sensor 13 detects supply water temperature TW, a temperature sensor 3 detects the hot-water temperature in a hot-water storage tank 1, a water level sensor 8 detects the water level in the hot-water storage tank 1, and a residual hot-water amount arithmetic device 14 calculates the residual hot-water heat storage amount QT. Simultaneously, an outside temperature sensor 12 calculates a heating capacity factor C, and the operation period for tomorrow T(h) is obtained. The operation period T(h) is input to a timer circuit 18 and compared with the cumulative operation period of a heat pump 2, and the heat pump 2 is operated for T hours on the following day to accumulate heat. When the operation period of the heat pump for tomorrow is corrected according to the outside temperature or the user's load consumption, a correcting factor B is obtained by an outside temperature sensor 16 and a consumed load input device 11 respectively through correcting circuits 16 and 17, and the heat collection operation period T for tomorrow is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot water storage type water heater, and more particularly to a hot water storage type water heater that determines the next day's operating time according to the amount of heat stored in the hot water storage tank.

(Prior Art) The present inventors, in Japanese Patent Application No. 63-211880,
A first temperature sensor that detects the temperature of water heading to the hot water storage tank, a second temperature sensor that detects the temperature of hot water in the hot water storage tank, a flow rate sensor that detects the amount of hot water coming out of the hot water storage tank, and a hot water storage in the hot water storage tank. A water level sensor is provided to detect the amount of heat used, and the amount of heat used is calculated from the detected values of the first temperature sensor, the second temperature sensor, and the flow rate sensor. We have proposed a hot water storage type water heater that stops operating when the sum of the amount of heat storage calculated from the values detected by a temperature sensor and a water level sensor exceeds a set value. In other words, when the sum of the amount of heat used in the morning and the amount of heat stored in the hot water storage tank in the evening exceeds a set value, this hot water storage type water heater stops the heating operation from now on and eliminates waste. This prevents heating operation and does not interfere with the use of hot water at night.

(Problems to be Solved by the Invention) However, in this hot water storage type water heater, the components, devices, and controls are complicated, such as calculating the amount of heat used in the morning. For example, even if the amount of hot water used after evening is small, heating operation is performed at the set amount, so extra heating operation is performed.Furthermore, even if there is a large amount of hot water remaining on day There is no connection with the operation, and there is a possibility that an extra heating operation will be performed again the next day.

(Object of the Invention) The present invention was devised in view of the problems of the conventional devices, and provides a hot water storage type water heater that does not require much extra heating operation and is easy to configure and control. The purpose is to provide

(Means for Solving the Problems) According to the present invention, water is gradually supplied to the hot water tank while the heating source is operated, thereby maintaining the temperature of the hot water in the hot water tank within a predetermined temperature range. In a hot water storage type water heater that gradually increases the amount of hot water, the hot water storage tank is provided with a water level sensor and a temperature sensor, and a load termination signal is inputted when the use of hot water for - days is finished. A signal input device is provided, and when this load end signal is input, the operation time of the heating source for the next day is calculated based on the amount of heat storage of the remaining hot water detected by the water level sensor and the temperature sensor, and the operation time of the heating source is calculated for the next day only. A hot water storage type hot water supply device is provided which is characterized in that it performs heat collecting operation on the next day, thereby achieving the above object.

(Function) According to the above configuration, when the use of hot water for - days is finished, the amount of heat storage of the remaining hot water in the hot water storage tank is detected, and the amount of heat storage of the remaining hot water is determined according to the amount of heat storage of the remaining hot water, for example. If there is a large amount, the operation time will be shortened the next day, and if the residual hot water storage amount is small, the operation time will be lengthened the next day. Since the heat collection operation is performed according to the usage situation of the user, there is no need for unnecessary operation.

(Implementation N) Hereinafter, the present invention will be explained in detail based on the accompanying drawings.

FIG. 1 is a schematic diagram showing an embodiment of a hot water storage type water heater according to the present invention, where l is a hot water storage tank, 2 is a heat pump as a heating source, and 3 is a temperature sensor.

The hot water storage tank 1 is configured such that a heat insulating material is interposed between the hot water storage tank and the casing so that the hot water in the hot water storage tank can be kept warm.

In the hot water storage tank 1, a heating circuit Il@4 in which a circulation pump 4a is installed is provided in a heat exchange relationship with the condenser 2b of the heat pump 2.

The heat pump 2 as the heat source is mainly composed of a compressor 2a, a condenser 2b, an expansion valve 2c, and an evaporator 2d. The heat pump 2 uses, for example, a non-azeotropic mixed refrigerant.

The temperature sensor 3 is composed of a thermistor, a thermostat, or the like.

A hot water supply port 5 for supplying water into the hot water tank 1 is provided in the upper part of the hot water storage tank l, and the water supply port 5 has a water supply control valve 6 and a water supply port 5 when the hot water storage tank 1 is filled with water. A pole tap 7 is provided to stop the water supply from the water supply port 5.

The water supply control valve 6 is constituted by a flow rate control valve that can supply water into the hot water tank 1 by varying the amount of water by varying the valve opening degree.

A water level sensor 8 is provided near the bottom of the hot water tank 1 to detect the water level within the hot water tank 1. The water level sensor 8 is composed of, for example, a diaphragm type pressure sensor.

Further, in FIG. 1, reference numeral 9 denotes a control device for adjusting the opening degree of the water supply control valve 6 based on the temperature sensed value of the temperature sensor 3;
13 is a load end signal input device through which the user inputs a load end signal when the hot water has been used for one day; and 13 is a temperature sensor for detecting the water supply temperature.

The basic operation of the hot water storage type water heater configured as described above will be explained.

First, the water level in the hot water tank 1 detected by the water level sensor 8 is compared with a preset minimum water level. If the water level in the hot water storage tank 1 is below the minimum water level, the water supply control valve 6 is opened by a control signal from the control device 9 based on the detection signal of the water level sensor 8, and water is supplied until the water level in the hot water storage 11J1 reaches the minimum water level or higher.

If the water level in the hot water storage tank 1 is higher than the lowest water level, the temperature value of the temperature sensor 3 is read, and if the water level is higher than the boiling temperature, the operation of the heat pump 4a is stopped. If it is lower than that, the operation of the heat pump 2 and the circulation pump 4a is started or continued, and the water supply control valve 6 is opened so that the temperature sensed value of the temperature sensor 3 falls within the available set temperature range. Continue water supply while correcting the temperature.

Note that P I DIIIm or the like is applied to this correction.

Next, the operation after the use (load) of hot water for -day is completed will be explained based on FIG. 2.

First, when the user inputs a load end signal using the load end signal input device 110, the water temperature sensor 13 indicates the water supply temperature TV, and the temperature sensor 3 indicates the hot water storage I! 1 and the water level of the hot water storage tank 1 are detected by the water level sensor 8, and the remaining hot water amount calculation device 14 calculates the remaining hot water heat storage amount of 0. At the same time, the heating capacity coefficient C is calculated by the outside temperature sensor 12, and the next day's operating time T<h> is determined. This is input into the timer circuit 18 and compared with the operation integrated value of the heat pump, and the heat pump 2 is operated for T hours on the next day to collect heat.

In addition, when correcting the operation time of the heat pump on the next day based on the outside temperature or the user's load usage amount, the correction coefficient B is determined by the outside temperature sensor 12 and the usage load input device 11 through the respective correction circuits 16 and 17. Then, the heat collection operation time T for the next day is corrected.

In this manner, by correcting the operation time of the heat pump for the next day according to the outside temperature, it is possible to accurately store a predetermined amount of hot water at a predetermined temperature at a predetermined time on the next day, regardless of the season or the like.

In addition, by correcting the operation time of the heat pump for the next day according to the user's load usage, wasteful heat collection operation can be avoided.

In addition, if you forget to input the load input device 11, Q, =O
You may drive after determining that.

(Effects of the Invention) As described above, according to the hot water storage type water heater according to the present invention,
A water level sensor and a temperature sensor are provided in the hot water storage tank, and a load end signal input device is provided to input a load end signal when -day's worth of hot water usage is completed, and when this load end signal is input, Since the operation time for the next day is determined by the amount of residual hot water heat storage detected by the water level sensor and temperature sensor, there is almost no need for extra heating operation, resulting in significantly less heat loss, and the structure and control are simple. A simple hot water storage type water heater can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a hot water storage type water heater according to the present invention, and FIG. 2 is a block diagram for explaining the operation. 1, hot water tank 2, heating source 3, temperature sensor 8, water level sensor

Claims (3)

[Claims] (1) A hot water storage type water heater that gradually increases the amount of hot water while maintaining the temperature of the hot water in the hot water tank within a predetermined temperature range by gradually supplying water to the hot water tank while operating the heating source. In addition to providing a water level sensor and a temperature sensor in the hot water storage tank, a load end signal input device is provided to which a load end signal is input when one day's worth of hot water usage is completed, and this load end signal is input. The hot water storage method is characterized in that the operation time of the heating source for the next day is calculated based on the residual hot water heat storage amount detected by the water level sensor and the temperature sensor, and the heat collecting operation is performed for the calculated operation time on the next day. Water heater. (2) The hot water storage type water heater according to claim (1), further comprising a temperature sensor for detecting outside temperature, and correcting the next day's heat collection operation time according to the outside temperature detected by the temperature sensor. . (3) Claim (1) or (1) wherein a usage load input device is provided so that the user can set the amount of heat to be used for the next day.
The hot water storage type hot water supply device according to 2).