JPS60159526A - Hot-water supplier utilizing solar heat - Google Patents

Abstract

PURPOSE:To constitute the hot-water supplier utilizing solar heat, capable of supplying high-temperature heat medium by reheating it by an auxiliary heat source machine in case the heat source is insufficient by utilizing the solar heat only by a method wherein a control unit, for controlling the operations of a switching valve for mixing and a flow path switching valve by detecting the temperature of the heat medium in a hot- water reserving tank, is provided in the device. CONSTITUTION:In case hot-water supplying temperature TH is higher than a set temperature TS, the flow path switching valve 26 opens a path (d)-(h) and closes the path (d)-(e) while the switching valve 24 for mixing is switched to a mixing mode I . In this case, the path (a)-(c) of the first switching valve 24 for mixing is closed gradually and the path (b)-(c) of the same valve is opened to regulate the temperature of hot-water to the set temperature TS to discharge the hot-water. In case the hot-water supplying temperature TH is lower than the set temperature TS, the siwtching valve 24 is switched to the mixing mode II and the flow path switching valve 26 closes the path (d)-(f) and opens the path (d)-(e). In this case, the temperature of feeding water for the auxiliary heat source machine 12 is regulated by the switching valve 24 to the upper limit temperature TA and the temperature of the heat medium C is increased by the auxiliary heat source machine 12 to discharge it.

Description

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

Conventional technology> As shown in Fig. 1, in a conventional water heater using solar heat,
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 the heat medium B in this order from the upper opening of the expansion tank 2, such as propylene glycol, etc. The heating medium B is filled with antifreeze having the following components.

When the solar heat collector 5 receives sunlight, the high temperature sensor H 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. A temperature difference of more than a certain level occurs between the two.

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 is as follows: hot water sampling pipe 9 inserted into the heat storage tank 1 → hot water supply pressure pump device 10 → hot water supply piping 11 → (auxiliary heat source (12) → mixing switching valve 13 →
The heating medium C is configured to be supplied through the hot water tap 14. With this configuration, when the user sets the desired temperature on the operation panel 15 and opens the hot water taps 1, 1, the pressure switch 15a detects that the pressure is below 1 ft and operates the hot water pump 16, The heat medium C in the upper layer is sent out in order from the one with the highest temperature.

When the temperature of the heat medium C is lower than the set temperature of the mixing switching valve 13, the auxiliary heat source (12 circuits are switched off), and the auxiliary heat source (12 circuits start operating, and the low temperature heat medium C and the auxiliary heat source The heat medium reheated by the heat exchanger 12 is adjusted to a predetermined temperature by the mixing switching valve 13 and can be used from the hot water tap 14.The hot water pump 16 is controlled to automatically stop when the hot water tap 14 is closed. In addition, 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.

However, the following problems arose in the second part of the structure.

(i) If the temperature of the heating medium C is higher than the setting, the temperature cannot be adjusted during the piping, and the user mixes it with water at the hot water tap 14 to use it, but the operation is very difficult. (ii) Auxiliary heat source (if 12 is a gas instantaneous water heater, mixing switching valve 13
Although the heating medium C that is less than the set value of flows into the water heater,
Depending on the appliance, the heat resistance of the parts is low, so if used for a long period of time, the parts will deteriorate, shortening the life of the appliance, and there is also the risk of boiling. Generally, it is said that the maximum normal temperature of the parts listed in item 1 is approximately 30 to 35 degrees Celsius, and the setting is 5 () degrees Celsius.
In this case, hot water of 40 to 45°C will flow into the water heater, making it difficult to ensure the long-term life of the person.

<Purpose> In view of the above, an object of the present invention is to perform two-stage mixing and switching control, and to achieve a desired temperature when solar heat can be sufficiently utilized by combining with an auxiliary heat source device such as a gas instantaneous water heater. It is an object of the present invention to provide a hot water supply device using solar heat that can supply a high temperature heat medium by supplying a heat medium and reheating with an auxiliary heat source device when the use of solar heat alone is insufficient.

<Example> An example of the present invention will be described below with reference to FIGS. 2 and 3. Note that the same numbers as in Figure 1 (geometric parts are indicated by the same numbers)
In the hot water supply device according to the present invention, a hot water supply path 22 is connected to a hot water storage tank 21 that stores a heat medium heated by solar heat, and a supply path 23 that supplies a low temperature heat medium is connected to the hot water supply path. A mixing switching valve 24 is provided at the connection with the supply channel 23, a detour 25 is connected to the hot water supply channel 22 on the outlet side of the mixing switching valve 24, and an auxiliary heat source (12 A flow path switching valve 2G is provided at the connection portion of the hot water supply path 22 with the detour path 25 on the hot water storage tank side.・1
and a control device 27 for controlling the operation of the flow path switching valve 26.
is provided.

The mixing switching valve 24 has two inlets and one outlet.
This is a three-way valve that can adjust the opening degrees of the two artificial side channels by proportional operation in response to external signals.

The flow path switching valve 26 is a three-way valve having one inlet and two outlets, and switches between the two output flow paths in response to an external signal.

In addition, 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 that controls on/off of the heat collection pump 3 is provided.

This heat collection control circuit 8 includes a high temperature sensor I4 provided in the heat collector 5 and a low temperature sensor L provided in the lower part of the hot water storage tank 21. Further, numeral 28 in the figure is a low temperature replenishment tank, to which the replenishment path 23 is connected.

Further, the bottom of the replenishment tank 28 and the bottom of the hot water storage tank 21 are connected by a communication pipe 29, and the upper part of the replenishment tank 28 and the upper part of the hot water storage tank 21 are connected by an expansion pipe 3(). The expansion pipe 30 functions to remove air bubbles generated in the hot water storage tank 21 when the temperature rises, and at the same time absorb the expansion of the volume j.

30a is an overflow pipe.

The hot water supply path 22 is connected to the upper part of the hot water storage tank 21 via a hot water outlet pipe 31, and the hot water outlet pipe 31 is connected to the a boat of the mixing switching valve 24, and the replenishing path 23 is connected to the b port of the mixing switching valve 24. A hot water supply pump 16, a check valve 32,
The pressure switch 15a and the accumulator 33 are connected in sequence. Further, the flow path switching valve 26 is connected to the hot water supply path 22 and d.
The boat is connected to the detour 25) and the C port to the hot water supply path 22 on the hot water tap 14 side.

The control device 27 includes a temperature sensor 34 that senses the temperature of the heating medium on the northern side of the hot water storage tank 21, an operation panel 15 for setting a desired temperature, and an output signal from the sensor 34 and an operation panel 15 for setting a desired temperature. The mixing mode of the mixing switching valve 24 or the flow path switching valve 26 is determined by comparing the set temperature signal from the panel 15.
The control circuit 35 outputs a signal instructing the switching mode and 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 with reference to FIG. The user uses the operation panel 15 to set a predetermined temperature, for example, GoS. Further, the temperature T)I of the hot water sampled in the hot water storage tank 21 is detected by the temperature sensor 34. Then, as shown in FIG. 3, the hot water sampling temperature 1.11 is compared with the set temperature TS.

When the hot water sampling temperature TH and the set temperature TS are almost equal, the mixing switching valve 24 is open for a-c and closed for 1]-c, and the flow path switching valve 26 is open for d-f and quiet for d-e. becomes (switch mode (
■)). When the hot water supply faucet 14 is opened in this state, the hot water supply pressurizing pump device 1 ( ) starts operating, and desired hot water can be used from the hot water supply faucet 14 .

When the hot water sampling temperature TH is higher than the set temperature TS, the flow path switching valve 26 is in the same state as in item 1, but the mixing switching valve 24 is in the mixing mode (I). That is, the a-c passages of the first mixing switching valve 24 are sequentially closed, while the b-c passages are opened, and the hot water is adjusted to the set temperature TS and tapped.

When the hot water sampling temperature TH is lower than the set temperature TS, the mixing switching valve 24 is set to the mixing mode (old mode), and the flow path switching valve 26 is set to the a-
r is closed, and d'-e is open (switching mode (■)). That is, the mixing switching valve 24 adjusts the water supply to the auxiliary heat source device 12 to the upper limit temperature TA, and the heating medium C is heated by the auxiliary heat source device 12 and tapped.

In this embodiment, a pressure switch method is used as a control means for the hot water supply pressure pump device 10, but the present invention is not limited to this.
- Of course, a device using a switch in combination can also be used. Although the indirect heating method is shown as the heat collection method, the same effect can be achieved with a direct heating method in which the heat exchanger is eliminated and the heating medium is directly circulated.

Next, another embodiment of the present invention will be described with reference to FIGS. That is, the water heater of this example has a low-temperature operating valve 1 that opens and closes by sensing the outside temperature in a detour 25 on the hot water outlet side of the auxiliary heat source device 12.
2a is provided, and when the outside temperature drops, the operating valve 1
By opening 2a, the instrument is prevented from being damaged by freezing. The switching valve 26 is provided at the connection part of the hot water supply path 22 and the detour path 25 on the hot water tap 14 side, and the hot water supply path 22 and the d boat are connected, the detour path 25 and the C port are connected, respectively, and the hot water supply path 22 and the detour path 25 are connected to the C port.
The port is connected to the hot water supply path 22 of the hot water tap 14. Further, a flow sensor 36 is connected to the outlet side of the switching valve 26 [the opening between the boat and the hot water tap 14], and converts the presence or absence of flow from the boat into an electrical signal,
It is output to 5. The configuration of the pond is the same as in the above embodiment.

In the above configuration, during hot water supply operation, if the hot water sampling temperature T I-1 and the set temperature 'rS are almost equal, the mixing switching valve 24 is switched between a and c.
is open, 1]-0 is closed, the switching valve 26 opens d-f,
e-( is closed. If you open the hot water tap 14 in this state,
The pressure switch 15a senses a decrease in the pressure in the hot water supply path 22, and the hot water pressurizing pump device 10 starts operating, so that desired hot water can be used from the hot water tap 14.

If the hot water sampling temperature TH is higher than the set temperature TS, the switching valve 2
6 is the same state as above, but the mixing switching valve 24 is in the mixing mode (1). That is, the a-0 passages of the mixing switching valve 24 are sequentially closed, while the b-c passages are opened, and the hot water is dispensed after being adjusted to the set temperature 1'S. Such proportional operation is made possible by detecting the temperature at the outlet (C port) of the mixing switching valve 24 and performing feedback control on the mixing switching valve 24.

When the hot water sampling temperature TH is lower than the set temperature TS, the mixing switching valve 24 switches to the mixing mode (formerly), and the flow path switching valve 26 switches to the switching mode (formerly).
The upper limit temperature T A of the water supplied to the auxiliary heat source unit 12 is adjusted to below T A, the flow path switching valve 26 closes df and opens the detour 25 side, and the heating medium C with the upper limit temperature rA flows to the auxiliary heat source unit 12. The hot water temperature is raised by the hot water tap 14, and the hot water is supplied from the hot water tap 14.The hot water temperature in this case is determined by the heating capacity of the auxiliary heat source device 12, and 12 temperature adjustments are required from the auxiliary heat source.The above is the normal hot water supply state. .

Next, we will explain how to prevent freezing damage of auxiliary heat i:1112 during winter.

In this case, the hot water supply has stopped or the outside temperature is 1)
When the low temperature operating valve 12a is opened, the heat medium C in the hot water supply path 22 passes through the auxiliary heat it<ill 12 and is discharged from the low temperature operating valve 12a. When the needle is pressed, the hot water supply pressure pump device 10 starts operating when the pressure switch 15a senses the pressure drop, and at the same time, the flow sensor 3 starts operating in response to the pressure drop of the pressure switch 15a.
[; senses the presence or absence of flow in the flow path and the flow is zero), and the mixing switching valve 24 is closed for a-c and open for b-c. As a result, when the low-temperature operation valve 12a is activated, only the low-temperature heat medium C in the replenishment tank 28 is discharged, and the high-temperature heat medium C in the hot water storage tank 21 flows into the auxiliary heat & rock 12, shortening the life of the appliance. or wastefully discharged.

By the way, in the conventional device shown in FIG. 1, although freezing damage can be prevented by the action of the actuating valve 12a, the two-step control by the mixing switching valve and the flow path switching valve is not performed, so the heat generated in the hot water storage tank is prevented. The medium C will be wastefully discharged, and at the same time, the outflow of the high-temperature heat medium C will accelerate the deterioration of the auxiliary heat source.

<Effects> As is clear from the above description, the present invention provides a method in which a hot water supply path is connected to a hot water storage tank that stores a heating medium heated by solar heat, a supply path for supplying a low temperature heating medium is connected to the hot water supply path, and A mixing switching valve is provided at the connection portion of the hot water supply path with the replenishment path, a detour is connected to the hot water supply path on the outlet side of the mixing switching valve, an auxiliary heat source device is provided in the detour, and the hot water supply path A flow path switching valve is provided at the outlet side connection portion or the hot water tank side connection portion with the detour of the channel, and the operation control of the mixing switching valve and the flow path switching valve is performed by sensing the temperature of the heating medium in the hot water storage tank. It is equipped with a permanent control device.

Therefore, according to the present invention, it is possible to connect to an auxiliary heat source device including an instantaneous water heater regardless of the temperature of the hot water storage tank, and if solar heat is available, simply open the hot water tap. A heating medium at a desired temperature can be taken out, operability is extremely easy, and solar heat can be used effectively.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional water heater using solar heat, Fig. 2 is a block diagram of a water heater using solar heat showing an embodiment of the present invention, Fig. 3 is a flowchart of the hot water supply operation, and Fig. 4 is a block diagram showing a conventional water heater using solar heat. 5th block diagram of a water heater using solar heat showing another embodiment of the present invention
The figure is a flowchart of the hot water supply operation. 12: Auxiliary heat source machine, 21; Hot water storage tank, 22: Hot water supply path, 23
: Supply path, 24: Mixing switching valve, 25; Detour path, 26: Flow path switching valve, 27; Control device. Figure 4 5 Figure 3

Claims (1)

[Claims] A hot water supply path is connected to a hot water storage tank that stores a heating medium heated by solar heat, a supply path for supplying a low-temperature heating medium is connected to the hot water supply path, and a mixing switching valve is provided at a connection part of the hot water supply path with the supply path. A detour is connected to the hot water supply path on the outlet side of the mixing switching valve, an auxiliary heat source device is provided in the detour, and a connection part of the hot water supply path with the detour on the hot water outlet side or on the hot water storage tank side. A flow path switching valve is provided at the connection part, and a control device is provided for sensing the heat medium temperature in the hot water storage tank and controlling the operation of the mixing switching valve and the flow path switching valve. A water heater that uses solar heat.