JPH02146458A - Hot water feeding system - Google Patents

Abstract

PURPOSE:To enable a proper temperature to be continuously attained without modifying a mixing ratio between water and hot water by a method wherein a temperature of water to be supplied is detected, a set hot water temperature is calculated in response to the detected water temperature, the set hot water temperature is made as a set hot water temperature of the first and second hot water feeders. CONSTITUTION:A temperature of fed water is detected by a water temperature detector means 6 and inputted to a calculation means 4. The calculation means 4 may calculate a set temperature TR through calculation and output it. A hot water temperature control device 3 for the first hot water feeder 1 may control such that a hot water temperature is equal to a set hot water temperature TR from the calculation means 4. Similarly, the hot water temperature control device 12 of the second hot water feeder 10 may control it such that it becomes equal to a set temperature TR from the calculation means 4. Since the hot water temperature supplied from the second hot water feeder 10 to a faucet 17 is always equal to the set temperature TR, after setting of the mixing ratio of the faucet 17 once, the proper temperature can be attained without varying this mixing ratio after starting the hot water feeding irrespective of a presence or a non-presence of the dead water and further there is no danger of getting a fire burn.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water supply system comprising a first water heater that supplies hot water to a plurality of taps, and a second water heater provided between the taps and the first water heater. Regarding.

Conventional Techniques A conventional hot water supply system of this type has a configuration as shown in Figure 2.

That is, the first water heater 19 supplies hot water to the plurality of washers 1718, and guides the water coming in as W to the hot water storage tank 2, and heats this water with the electric heater 5 to form hot water. The temperature TRI of the stored hot water is the hot water supply temperature, and the set hot water temperature TRI set by the hot water temperature setting means 20
The hot water temperature control device 3 operates so that the temperature becomes equal to . In the hot water temperature control device 3, the controller 8 controls the electric power control means 9 to control the amount of electricity supplied to the heater 5 so that the set hot water temperature T Rl and the hot water temperature TRI in the hot water storage tank 2 detected by the hot water temperature detection means 7 are equal. By controlling the water temperature T, 4. Set hot water temperature TR
Make it equal to I. The second water heater 21 is installed near the hot water tank 17, stores hot water from the first water heater 2 in a hot water storage tank 11 with a relatively small amount of hot water, and sets the hot water temperature T2 to the hot water temperature setting means 22. The hot water temperature control device 12 controls the amount of electricity supplied to the electric heater 13 in the hot water storage tank 11 so that the hot water temperature T az becomes equal to the set hot water temperature T az .
H2 is equal to the set hot water temperature TR2, and
7 is accordingly supplied with hot water at temperature T and 12.

The hot water temperature control device 12 detects the hot water temperature T□2 from the hot water temperature detection means 14.
This is achieved by the controller 15 controlling the amount of electricity supplied to the electric heater 13 via the power control means 16 so that the water temperature is equal to the set hot water temperature TR2. With this configuration, it is possible to eliminate the so-called dead water problem that occurs in the drain 17 when the second water heater 22 is not provided. In other words, dead water is the water in the piping between the water heater and the water heater, and while the hot water supply is stopped, the temperature of the hot water in the piping decreases due to heat radiation, and eventually the temperature of the hot water in the piping decreases to almost the same as the atmospheric temperature of the piping. When hot water is turned on again after stopping the hot water supply for a long time, the water in this pipe, that is, dead water, is first supplied from the boiler to the boiler, and after this dead water runs out, hot water is supplied from the water heater. The problem arises that hot water is not immediately available even after opening. This water problem can be solved by installing a second water heater near the water heater. In other words, even if there is dead water in the piping between the first water heater and the second water heater, the second water heater converts the dead water into hot water at a temperature of TRI and supplies it to the boiler. There will be no water problem.

Problems to be Solved by the Invention However, in such a configuration, the hot water temperature setting means of the first water heater 19 and the second water heater 21 are 20, respectively.
．． 22, therefore, if the set hot water temperature TRI of the first water heater 19 is set higher than the set hot water temperature TR2 of the second water heater 21, the temperature inside the hot water storage tank 11 after the start of hot water supply is After the hot water at the temperature TR2 is supplied to the run 17, the hot water at the temperature T□ is supplied to the run 17,
The temperature of the hot water supplied to the ring 17 rises from TR The problem was that it required complicated operations such as changing the mixing ratio of hot water and hot water to obtain the appropriate temperature. There is also the problem that burns may occur if the set hot water temperature TR8 is set much higher than the set hot water temperature TR2. The set hot water temperature T, I□ of the second water heater 21 is the amount of hot water stored in the hot water storage tank 11, and the temperature of the water supplied to the hot water tank 17 is Tw.
i, QL is the amount of hot water dispensed from Callan 17, and T is the temperature of the hot water obtained by mixing the hot water from Callan 17.
Assuming WO, it is determined by the following formula.

For example, Q++ = 10f, T, , = 5°C - Qt = 3
01, T2°=30°C, TR2=80'C. For example, if the summer water temperature Ti rises to 20'C, then T = 50'C and there is no need to raise it to 80°C.In both winter and summer, there is no need to change the set hot water temperature TR2. In order to supply hot water, the temperature needs to be 80°C under the above conditions, and in the summer when 80°C is not necessary, there is waste in the hot water storage tank 11 and the piping between the second water heater and the hot water tank 17. In addition, to solve this problem, the set hot water temperature T8□ had to be changed according to the water temperature, and the user measured the water temperature and set the hot water temperature based on it. This requires a series of operations such as calculating the water temperature, operating the hot water temperature setting means 21, and setting the set value of the hot water temperature to the previously calculated value, which is virtually impossible.

In view of the above-mentioned problems, the present invention makes it possible to maintain an appropriate temperature regardless of the presence or absence of water (without manipulating the mixing ratio of water and hot water in Calan 17), without the risk of burns, and without unnecessary heat radiation loss. The purpose is to provide a hot water supply system that can suppress the occurrence of.

Means for Solving the Problems In order to achieve the above object, the present invention includes a water temperature detection means for detecting the temperature of supplied water, and a set water temperature is calculated based on the water temperature detected by the water temperature detection means. calculation means;
This set hot water temperature is used as the set hot water temperature of the first and second water heaters.

According to the above configuration, the water temperature is detected by the water temperature detection means,
The calculation means calculates the set water temperature based on this water temperature, and
And the hot water temperature of the second water heater becomes equal to the setting 1J11 calculated in this way. Therefore, the hot water temperature of the first water heater is equal to or lower than the hot water temperature of the second water heater. Furthermore, the hot water temperature of the second water heater will automatically change according to the water supply temperature.

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

In FIG. 1, reference numeral 1 denotes a first water heater, which differs from the first water heater in the conventional hot water supply system in FIG. The difference is that water temperature detection means 6 for detecting the temperature of water is added. 0 is the second water heater, which differs from the one in FIG.
The output is input as the set water temperature. The calculating means 4 calculates the set hot water temperature based on the supplied water temperature from the water temperature detecting means 6.

This calculation first calculates TR□ using equation (1), and then multiplies it by a coefficient SF of 1 or more, or adds T to a predetermined temperature to TRZ and outputs the set temperature T. Yes, these T! The operation of further multiplying or adding 12 is based on the concept of a so-called safety factor.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

The water supply temperature is detected by the water temperature detection means 6 and input to the calculation means 4. The calculation means 4 calculates the set temperature T by the calculation described above.
Calculate and output R. Hot water temperature control device 3 of first water heater 1
controls the hot water supply temperature so that it becomes equal to the set hot water temperature T from the calculation means 4. Similarly, in the hot water temperature control device I2 of the second water heater 10, the hot water temperature is set to the set temperature TR from the calculation means 4.
is controlled to be equal to . The first to the second water heater 10
Since the temperature of the hot water supplied from the water heater I is TR equal to the set temperature, the temperature of the hot water supplied from the second water heater
The temperature of the hot water supplied to 7 is always equal to the set temperature T. For this reason, regardless of the presence or absence of dead water, the degree Karan 17
Once the mixing ratio is set, the appropriate temperature can be obtained without changing the mixing ratio after water supply starts, and there is no risk of burns. Further, since the set hot water temperature T changes according to the water temperature, the hot water supply temperature in summer is automatically lower than that in winter, thereby suppressing wasteful heat radiation loss.

In the above explanation, the calculation means 4 includes the hot water temperature control device 3 of the first water heater 1 and the hot water temperature control device 12 of the second water heater 10.
The same set hot water temperature was given to the hot water temperature control device 3, but the hot water temperature set to the hot water temperature control device 3 is the value obtained by subtracting the predetermined temperature ΔTA from the setting/IJ temperature T obtained as described above, or the calculation of the safety factor. The value before applying TR2 etc.T.

It may be configured to output a value lower than . Also the first
The water heater 1 was a so-called hot water storage electric water heater type water heater, but even if it uses other energy sources such as gas oil or an instantaneous type, the present invention can be applied in the same way. It is clear that this can be done. Also, water temperature detection means 6,
Although the calculation means 4 is built into the first water heater 1, the water temperature detection means may be placed anywhere as long as the water temperature can be detected.
For example, the calculation means may be provided in the cooker 17 (the calculation means may be provided in the second water heater 10, the cooker 17, or any other suitable location).

As described in detail, the present invention provides the following effects.

(1) Once you set the mixture ratio of Karan, you can use it without changing it after that, regardless of the presence or absence of water.
Always get the right temperature.

(2) Safe with no risk of burns.

(3) Wasted heat radiation loss can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a hot water supply system according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional hot water supply system. 1...First water heater, 3...Hot water temperature side f
all devices, 4... calculation means, 6...
Water temperature detection means, 1o...Second water heater, 12.
・・・・・・Hot water temperature control device. Name of agent Patent attorney Shigetaka Awano Haka 1 person - 1 - m - Mo 1's 梠れ對, 1 @ Wari Encho 1 111 Hands Hoshi Hoshi Ina 1) 4- Shintsuru 2's 絽Separately @bedded

Claims (1)

[Claims] a first water heater that supplies hot water to a plurality of tanks, a second water heater that is provided between the first water heater and the range and that receives hot water from the first water heater, reheats it, and supplies hot water; The first water heater is equipped with a water supply temperature detection means for detecting the temperature of the water to be heated, and a calculation means for calculating and outputting a set hot water temperature based on the temperature of the water supply detected by the water supply temperature detection means. a hot water temperature control device that controls the amount of energy supplied so that the set hot water temperature from the calculation means and the hot water supply temperature are equal;
The hot water supply system includes a hot water temperature control device that controls the amount of energy supplied so that the set hot water temperature from the calculation means and the hot water supply temperature are equal.