JPS60159525A - Hot-water supplier utilizing solar heat - Google Patents

Abstract

PURPOSE:To constitute the hot-water supplier utilizing solar heat capable of supplying the heat medium of a desired temperature by providing a control device for controlling the operation of switching valve for mixing by detecting the temperature of the heat medium in a hot-water reserving tank. CONSTITUTION:In case the temperature TH of supplying hot-water is higher than a set temperature TS, the second switching valve 26 for mixing opens the path (d)-(f) and closes the path (e)-(f) while the first switching valve 25 for mixing closes the path (a)-(c) gradually and opens the path (b)-(c) whereby the hot- water is discharged after being regulated so as to have the set temperature TS. These proportional movements are effected through a control circuit 39B by the signal of a hot-water supplying sensor 40 in a hot-water supplying path 22. In case the temperature TH of discharging hot-water is lower than the set temperature TS, the first switching valve 25 controls to open the path (a)-(c) and close the path (b)-(c). Then the temperature of supplying hot-water may be regulated by the proportional movement of the second switching valve 26 for mixing effected by the heat medium C, whose temperature is lower than the set temperature TS, and the high-temperature heat medium C in the high-temperature supplementing tank 20.

Description

[Detailed description of the invention] Technical fields> The present invention relates to a water heater that utilizes solar heat.

<Prior art> As shown in Fig. 1, in the conventional solar water heating system,
Heat collection circuit A consists of open expansion tank 2 → heat collection pump 3 → outgoing pipe 4
→ solar heat collector 5 → return pipe 6 → heat exchanger 7 → open expansion tank 2. The circuit A is configured to circulate heat IIB in sequence.
An antifreeze solution containing propylene glycol as a component is filled as a heating medium B from the upper opening of the expansion tank 2. When the solar heat collector 5 receives sunlight, the high temperature sensor t+ installed in the heat collector 5 is heated, and the low temperature sensor L detects the temperature of the heat medium (usually water) C stored in the heat storage tank 1. During which time a difference in temperature above a certain level occurs.

Then, the heat collection pump 3 starts operating under the action of the control circuit 8, and the heat medium B repeats circulation through the heat collection circuit A, and the heat medium C in the heat storage tank is heated through the heat exchanger 7. When the temperature difference between the two sensors H and L disappears, the heat collection pump 3 stops and the heat collection operation ends.

Next, hot water supply operation will be explained. The hot water supply circuit passes through the hot water sampling pipe 9 inserted into the heat storage tank 1 → the hot water supply pressure pump device 10 → the hot water supply piping 11 → (auxiliary heat source device 12) → the mixing switching valve 13 → the hot water tap 14, and then the heating medium C is configured to be supplied with With this configuration, the user sets the desired temperature in the western-style building 15 and opens the hot water taps l and t, and then turns on the j tenka switch 15.
A senses a drop of 1 Eka and activates the hot water pump I6, and the heat from the upper layer of the heat storage tank 1, JJJ, <2, is sent out sequentially. When the temperature of the heating medium C is lower than the set temperature of the mixing switching valve 13, the circuit of the auxiliary heat source (Iku 12) is partially opened, and as a result, the auxiliary heat source (Iku 12 starts operating, and the low-temperature heating medium C and the auxiliary heat source The heat medium heated by the heat exchanger 12 is adjusted to a predetermined temperature by the mixing switching valve 1;) and can be used from the hot water tap 14. Note that the hot water pump 16 is activated when the hot water tap 14 is closed. It is controlled to stop automatically. Also, the heat medium C corresponding to the amount used is supplied to the heat storage tank 1 by a ball tap 17 and guided to the lower layer of the heat storage tank 1 through a water distribution pipe 18 to prevent mixing of hot water and water. There is.

However, the above configuration has the following problems.

(1) If the temperature of the heating medium C is higher than the setting, the temperature cannot be adjusted in the piping, and the user mixes it with water at the hot water tap 14 and uses it. It was very bothersome.

(ii) When the auxiliary heat source device 12 is a gas instantaneous water heater, the heat medium C that is less than the set value of the mixing switching valve 13 flows into the water heater, but depending on the equipment, the allowable temperature of the members is low; Therefore, if used for a long period of time, the components will deteriorate, shortening the life of the device, and there is also a risk of boiling. Generally, the maximum normal temperature of the above components is said to be approximately 30 to 35 degrees Celsius, and if the setting is 50 degrees Celsius, hot water of 40 to 45 degrees Celsius will flow into the water heater, which will ensure the long service life mentioned above. It becomes difficult.

(iii) Furthermore, the auxiliary heat source (the high temperature heat medium that has passed through 12 and the heat medium C whose temperature is lower than the set temperature) is adjusted to a flow rate according to the temperature of each by the mixing switching valve 13, but at this time, the auxiliary heat source If the flow rate passing through the combustion chamber is small, combustion may hunt or stop, resulting in the inconvenience that the desired temperature cannot be obtained.

<Purpose> In view of the above, an object of the present invention is to provide a water heater using solar heat that can supply a heat medium at a desired temperature by performing two-stage mixing switching control and combining with an auxiliary heat source device.

<Example> An example of the present invention will be described below with reference to FIG. Note that the same functional parts as in FIG. 1 are indicated by the same numbers.

That is, the water heater according to the present invention has a hot water storage tank 19 that stores a heat medium heated by solar heat, a high temperature replenishment tank 2 () that stores a high temperature heat medium heated by an auxiliary heat source (12), and a low temperature heat medium. A hot water supply path 22 is connected to the hot water storage tank 19, and a low temperature replenishment path 23 for supplying low temperature heat medium from fi21 is provided, and a hot water supply path 22 is connected to the hot water storage tank 19. A high-temperature replenishment path 24 that supplies high-temperature heat medium from the replenishment tank 20 is connected to the low-temperature replenishment path 23, respectively.
A first mixing switching valve 25 is provided at the connection between the hot water supply path 22 and the hot water supply path 22, and a second mixing switching valve 26 is provided at the connection between the high temperature replenishment path 2.1 and the hot water supply path 22. A control device 2'7 is provided for sensing the temperature of the medium and controlling the operation of the mixing switching valves 25 and 26 (i11).

Each of the mixing switching valves 25 and 26 is of three types having two inlets and one outlet, and can adjust the opening degrees of the two flow paths by proportional operation in response to an external signal.

The heat collection circuit A includes an open expansion tank 2, a heat collection pump 3,
An outgoing pipe 4, a solar heat collector 5, a return pipe 6, and a heat exchanger 7 are connected in this order, and a heat collection control circuit 8 for controlling on-off of the heat collecting pump 3 is provided.

This heat collection control circuit 8 includes a high temperature sensor F1 provided in the heat collector 5 and a low temperature sensor L provided in the lower part of the hot water storage tank 19.

Further, the bottom of the low-temperature replenishment tank 21 and the bottom of the hot water storage tank 19 are connected by a communication pipe 29, and the upper part of the low-temperature replenishment tank 21 and the upper part of the hot water storage tank 19 are connected by an expansion pipe 30.

This expansion pipe 3() has the function of removing air bubbles generated in the hot water storage tank 19 when the temperature rises and at the same time absorbing volumetric expansion. 30a is an overflow pipe.

The hot water supply path 22 is connected to the second part of the hot water storage tank 19 via a hot water outlet pipe 31, and the hot water outlet pipe 31 is connected to the a boat of the n1j-th mixing switching valve 25 and to the low temperature supply path 2.
3 are respectively connected to the I] boat of the first mixing switching valve 25,
The d port of the second mixing switching valve 26 is connected to the hot water supply path 22 on the C boat side of the first mixing switching valve 25 . The high temperature replenishment line 24 is connected to the second mixing switching valve 26 (・boat, and the r port is connected to the hot water supply pump I 6, the reversal valve 32, +
The four-way switch 10a and the accumulator 33 are connected in sequence.

A supply path 1 '7 A is provided for supplying a low temperature heat medium to the low temperature replenishment tank 21 described in 11;j, and a heating flow path 2 (l
An auxiliary heat source device 12 is arranged at A. And the heating flow path 2t, l l\ from the auxiliary heat source device 12 to the high temperature supply tank 2 ()
A hot water supply valve 37 is provided in the auxiliary heat source unit 12, and serves to temporarily store the high temperature heat medium from the auxiliary heat source unit 12. The hot water supply valve 37 is activated by the water level control circuit 3 in response to a signal from the water level sensor 38.
Opening/closing is controlled by ~.

The control device 27 includes a temperature sensor 34 that senses the temperature of the heat medium on the upper side of the hot water storage tank 19, a production board 15 for setting a desired temperature, and a hot water tap that is closer than the second mixing switching valve 26. Hot water sensor 40 that detects the hot water temperature on the 14 side
, the output signal from the temperature sensor 34 and the machining board 15
a switching valve control circuit 39 that compares the set temperature signal from the hot water sensor 40 and outputs a signal for mixing or switching the mixing switching valves 25 and 26 based on the temperature signal from the hot water sensor 40;
B, and a control circuit 39C that controls the start/stop of the hot water pump 16 based on the signal from the pressure switch 15a.

Next, hot water supply operation will be explained. The user uses the operation panel 15 to set a predetermined temperature, for example, GoS.

Further, the temperature TH of the hot water sampled in the hot water storage tank 19 is detected by the temperature sensor 34 and compared with the set temperature TS.

When the hot water sampling temperature TH and the set temperature TS are approximately equal, the first mixing switching valve 25 opens a-c and closes b-c, and the second mixing valve 26 opens d-f and e-( When the hot water supply faucet 14 is opened in this state, the hot water supply pressure pump device 10 starts operating, and the desired hot water can be used from the hot water supply faucet 14.

If the hot water sampling temperature 1'11 is higher than the set temperature '1゛S,
The second second mixing switching valve 2 [; is] in the same state as in the description, but
First, mixing switching valve 2! ), passages a to c close sequentially - force, g ( - passage opens, and the set temperature is adjusted to '1゛S and hot water is dispensed. This proportional operation is caused by the hot water supply sensor 91 () of the hot water supply path 22. 1d in the control circuit 39B
1.

When the hot water sampling temperature Tll is lower than the set temperature 1'S, the first mixing switching valve 25 is controlled so that a-c is open and l+-c is closed. Then, the temperature of the high-temperature heating medium C in the high-temperature replenishing tank 20 and the heating medium C at a drawing temperature of 1'II, which is lower than the setting i'1'8, is adjusted by proportionally operating the second mixing switching valve 26. .

Note that a certain amount of heat medium C controlled by the water level sensor 38 is stored in the high temperature replenishment tank 2 (), and when not in use, the heat medium in the tank may radiate heat and become low temperature. . However, even in that case, the amount of hot water stored in the replenishment tank 20 only needs to be maintained at a maximum level of 1 degree Celsius to prevent air from entering the high-temperature replenishment path 24. There is no problem in use.The heat collecting operation is the same as the conventional example shown in FIG.

In the above embodiment, two mixing switching valves 25 and 26 were used, but in the present invention, it is expected that the same effect can be obtained even with one four-way mixing switching valve 42 as shown in FIG. That is, it is clear that this mixing switching valve 42 can be obtained with a structure in which the C port of the first mixing switching valve 25 and the d port of the second mixing switching valve 26 of the above embodiment are connected.

Effect> As is clear from the above description, the present invention provides a hot water storage tank for storing a heat medium heated by solar heat, a high temperature replenishment tank for storing a high temperature heat medium heated by an auxiliary heat source device, and a high temperature supply tank for storing a low temperature heat medium. A low temperature replenishment tank is provided, a hot water supply path is connected to the hot water storage tank, and a low temperature heating medium from the low temperature replenishment tank is supplied to the hot water supply path.
(The low-temperature replenishment path for supplying hot water and the high-temperature replenishment path for supplying high-temperature heat medium from the high-temperature replenishment tank are respectively connected, and a mixing switching valve is provided at the connection part of each replenishment path and hot water supply path, and A control device is provided for sensing the temperature of the heating medium and controlling the operation of the mixing switching valve.

Therefore, according to the present invention, the high temperature replenishment tank, the low temperature replenishment tank, and the mixing switching valve provide the capability of discharging the heat medium at the desired temperature, and the supply of the auxiliary heat source acid and the heat medium can be performed as before. Since there is no heat exchanger that passes through the high-temperature heat medium supplied from the hot water storage tank, there is no need to consider the deterioration of part H due to the inflow of high-temperature heat medium from an auxiliary heat source such as a gas instantaneous water heater. One disappointing effect is that the flow rate of the heat medium passing through the heat medium does not fluctuate as in the conventional method, and stable combustion can be performed.

[Brief explanation of drawings]

Figure 1 shows the configuration of a conventional solar hot water heater.
FIG. 2 is a block diagram of a water heater utilizing solar heat according to one embodiment of the present invention, and FIG. 3 is a block diagram of a mixing switching valve showing another embodiment of the present invention. 12: auxiliary heat i to mi if! , Iq: hot water storage tank, 20; high temperature replenishment tank, 21: discharge temperature replenishment tank, 22: hot water supply path, 23: low temperature replenishment path, 2.1: high temperature replenishment path, 25: first/mixing switching valve, 26: first Two mixing switching valves, 42: Mixing switching valve.

Claims (1)

[Claims] A hot water storage tank that stores a heat medium heated by solar heat, a high temperature replenishment tank that stores a high temperature heat medium heated by an auxiliary heat source (or a similar source), and a low temperature replenishment tank that stores a low temperature heat medium are provided, and the hot water storage tank A hot water supply path is connected to the hot water supply path, and a low temperature replenishment path for supplying the low temperature heat medium from the low temperature replenishment tank and a high temperature replenishment path for supplying the high temperature heat medium from the high temperature replenishment tank (iii.7) are respectively connected to the hot water supply path. , a mixing switching valve is provided at the connection between each replenishment path and the hot water supply path, and a control device is provided for sensing the mixed coal of the heating medium in the hot water storage tank and controlling the operation of the mixing switching valve. A water heater that uses solar heat.