JPS58145834A - Solar heat hot water feeder - Google Patents

Abstract

PURPOSE:To prevent the adhesion of fur to the internal surface of connecting pipes by a method wherein a liquid heat medium is circulated through a heat exchanger in a hot water storage tank and a heat exchanger utilizing hot water in a bathtub as a heat source. CONSTITUTION:The heat exchanger 10 provided in a hot water storage tank 2 and a solar heat collector 1 are connected by a forward pipe 4 and a backward pipe 5 and the liquid heat medium is forced to circulate through the tank 2 and the solar heat collector 1 by means of a pump 3 attached to the backward pipe 4. With the above structure, the heat exchanger 20 having its heat source derived from the hot water in a bathtub 8 is arranged parallel to the backward pipe 5 extending from the heat collector 1 to the heat exchanger 10 and a three-way valve 12 for switching the heat medium passage leading to the heat exchanger 20 to the heat medium passage leading to a communication section 5' of the backward pipe 5 is provided at the heat collector side junction of the exchanger 20 and the backward pipe 5. Further, the heat exchanger 20 is housed within a heat exchange tank 17 while the latter is connected to the bathtub 8 by an upper pipe 18 and a lower pipe 19 so that the hot water in the bathtub 8 circulates by natural convection. Accordingly, no fur or the like adheres to the internal surfaces of the connecting pipes since the liquid heat medium circulates through the heat exchangers 10 and 20.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a solar hot water supply system that utilizes the waste heat of hot water from a bathtub after an extended bath. FIG. 1 will be explained. Reference numeral 1 denotes a solar heat collector, which converts cold water supplied from a hot water tank 2 by a pump 5 into hot water and returns it to the hot water tank.

4 is an outbound pipe, 5 is a return pipe, and 6 is a cold water supply pipe (water supply) 7 is a hot water supply pipe that supplies hot water to bath II8. Nine hot water pipes are installed at the bottom of the bathtub 80, and the hot water is discharged through a heat exchanger 10 inside the hot water storage tank 2. 11 is a bypass pipe of the hot water discharge pipe 9, and a nine S side valve 1 is installed in the O hot water discharge pipe 9 between the bathtub 8 and the heat exchanger 10.
It is branched from 2. The opening and closing of the three-way valve 12 is automatically controlled based on the temperature difference between the temperatures detected by a temperature sensor 13 installed in the hot water discharge pipe 9 and a temperature sensor 14 installed in the hot water storage tank 2. In other words, the temperature of the stored hot water M is greater than or equal to the temperature of the discharged hot water (1)! (M≧11) a, the three-way valve 12 opens the bypass pipe 11 and closes the flow path to the heat exchanger 1o, and when B is much larger (Mug 1 closes the bypass pipe 11 and closes the flow path to the heat exchanger 1o) Open a flow path to.

However, the conventional water heater described above has the following drawbacks. (1) Temperature detector 13 and three-way valve 12 in the hot water drainage path
, and a heat exchanger 1o, the hot water O*Va from the bathtub may adhere to and accumulate on these, making it difficult or impossible to drain the hot water. C2) Heat exchanger 10Fi absorbs waste heat through the first passage of waste water, resulting in large size and high cost. (3) The heat exchanger 1o collects waste heat from the bathtub water, which is then discharged, so it can be reused for running water, etc. The present invention overcomes the above-mentioned drawbacks. The purpose is to provide a water heater using solar heat.

An embodiment of the invention will be described with reference to FIG.

The 10th solar heat collector installed inside the hot water tank 2 is a 1Fi solar heat collector.
The heat exchanger 10 is connected to an outgoing pipe 4 and a return pipe 5, and a hot water storage tank is formed by forcibly circulating the heat medium liquid filled inside these by means of a pump 5 provided on the outgoing pipe 4. Heat the water in 2. 6 is cold water supply pipe (water supply)
It is. 7 is a hot water supply pipe installed at the top of the hot water storage tank 2,
The bathtub 8 is connected to an auxiliary heater 15 whose heat source is waste, electricity, etc., and hot water at an appropriate temperature is supplied to the bathtub 8 through a hot water outlet pipe 16 of the auxiliary heater 15. 17d is a heat exchange tank that houses the second heat exchanger 20 inside, and is connected to the upper pipe 18 and the lower part 19,
It communicates with the bathtub 8. Both ends of the 20th heat exchanger 20 are connected to the return pipe 5 in parallel, and a three-way valve 12 is attached to the solar heat collector side of the joint with the return pipe 5. be.

Next, its effect will be explained. When recovering exhaust heat from bathtub water, the three-way valve 12 opens the flow path to the second heat exchanger 20, closes the communication portion 51 of the return pipe 5, and drives the pump 5.

The heat medium liquid that has undergone heat exchange with the hot water tank water in the first heat exchanger 10 passes through the outgoing pipe 4, the solar heat collector 1, and the return pipe 5, and enters the second heat exchanger 20 from the three-way valve 12. Heat exchanger 17
It exchanges heat with the bath water inside. When the temperature of the bathtub water in the heat exchange tank 17 decreases due to heat exchange, it sinks downward, so the upper pipe 1
Hot bath water with a high temperature flows in from B, and natural circulation of the bath water in the heat exchange tank 17 is performed. This second heat exchanger 20
(9) The heat transfer liquid returns through the first pipe 5.
0 enters the heat exchanger 10 and exchanges heat with the hot water tank water. When solar heat is collected without recovering exhaust heat from bathtub water, the flow path to the second heat exchanger 20 is closed using the three-way valve 12, and the communication portion 51 of the pipe 5 is opened to drive the pump 5. do. The heat transfer liquid enters the solar heat collector 1 through the outgoing pipe 4, absorbs solar heat, returns to the hot water tank 2 through the return pipe 5, and exchanges heat with the hot water tank water in the tenth heat exchanger 10. do.

The capacity of a typical household bathtub is 250 to 300 tons, and the water temperature is approximately 45°C. If the capacity of the hot water storage tank is 2001 and the temperature of the hot water storage is 80° C., the hot water stored in 11 points to the bathtub will be 172 or less, nb, and more than the lower half of the hot water storage tank 2 will be replaced with cold water. Recovery of waste heat from bathtub water is effectively carried out under such conditions. However, since the heat transfer fluid that exchanges heat passes through the solar heat absorption, if heat collection using the solar heat absorption is more effective than bathtub hot water waste heat recovery, then the bathtub hot water waste heat recovery is more effective. do not. Also, when the water temperature at the bottom of the hot water storage tank is higher than or equal to the water temperature in the bathtub, the waste heat (b) does not collect. Therefore, in order to control these operations, temperature detectors may be provided in each of the hot water tank, the solar heat collector, and the bathtub to detect the temperature difference, and the three-way valve 12 may be controlled. Furthermore, it is also possible to control the heat exchange cycle by timer control. Auxiliary heater 15
is used when solar heat collection is insufficient.

As described above, the solar hot water supply system of the present invention connects the first heat exchanger 1° installed in the hot water storage tank 2 and the solar heat collector 1 through the outgoing pipe 4 and the return pipe 5. , in a piping configuration in which the heat medium liquid filled inside is forcibly circulated by a pump 3 provided in the outgoing pipe 4, a return pipe from the solar heat collector 1 to the tenth heat exchanger 10; A second heat exchanger 20 using bath water as a heat source is installed in parallel with the 20th heat exchanger 20 and the return pipe 5, and the O connection part on the solar heat collector side is connected to the 20th heat exchanger 20 and the return pipe 5. , the 20th heat exchanger 20
The present invention is characterized in that a three-way valve 12 is provided to switch the flow path between the O#l path and the return pipe 5 to the communication 1ii5'. The 20th heat exchanger 20 has a heat exchange tank of 17 tC.
, the heat exchanger @17 is connected to the bathtub 8 by an upper pipe 1$ and 1pipe 19, and is configured to cause natural convection of hot water in the bathtub.

Since it has a configuration that is greater than zero emission ljI#i, it has the following effects. (1) Inside the 1st and 20th exchangers 10 and 200, there is no water shield or the like adhering to the inside of the tubes, where the heat medium IL circulates, and there is no bath water flowing into the heat exchange tank 17.
f11! Since Il can be removed by providing a filter in the upper tube 18, the hot water tIIa'j1 does not adhere to the surface of the 20th heat exchanger 20o and reduce the heat exchange efficiency. (2) Circulating the heat transfer liquid at high speed: Since it is possible to accelerate the collection of solar heat O and the recovery speed of the exhaust heat of the bathtub water, it is possible to downsize the heat exchanger. φ) After exhaust heat is recovered, it can be reused for bathtub baths, etc., which saves water. (4) Since the second heat exchanger 20 is provided in the return pipe 5 from the solar heat collector, there is no re-radiation of the recovered exhaust heat.

(5) It is possible to prevent freezing in winter by using antifreeze such as ethylene glycol as the heat transfer liquid.

The solar hot water supply device of the present invention has the above-described configuration and effects, and therefore eliminates the drawbacks of the conventional devices of this type mentioned at the beginning. It also has the nine advantages of effectively utilizing the exhaust heat from the bathtub in winter or rainy weather when solar heat is not fully utilized, and providing stable sparrow energy throughout the year.

[Brief explanation of the drawing]

Figure 1: Diagram showing the configuration of a conventional solar water heating system Figure 2 Diagram showing the configuration of an embodiment of the present invention (symbols) 1-
...Solar heat collector, 2--hot water storage tank, 3-pump, 4-outgoing pipe, 5-returning 9 pipes,

Claims (1)

[Scope of Claims] 0) A #11 heat exchanger and a solar heat collector are installed in the hot water storage cylinder and connected by an incoming pipe, a J pipe, and a K, and the inside of these O is filled with a heat medium wave. * In a piping configuration in which the water is forcibly circulated by a pump, the O return pipe from the solar heat collector to the 10th heat exchanger has a 20th A solar water heating system Q characterized in that heat exchangers are arranged in parallel and a three-way valve is installed to switch the flow path to the side O heat exchanger and the flow path to the connection part of the IIj pipe. ) The 10th @ exchanger is housed in a heat exchange tank,
The wire heat exchange tank is connected to the bathtub by an upper pipe and a lower pipe,
Scope of Claims (1) O Solar hot water supply device, in which the hot spring water is configured to undergo natural convection