JPS6146849A - Hot-water supplier utilizing solar heat - Google Patents

Abstract

PURPOSE:To heat promptly small amount of water by a method wherein a heat collecting circuit connected to a heat pump circuit at upper and lower positions of a heat storage tank is provided. CONSTITUTION:A compressor 1, a heat exchanger 7, a expansion valve 3 and a heat collector 4 comprise a heat pump circuit. The heat exchanger 7 is thermally and closely arranged in this circuit to a refrigerant path 8 in centre, a path of the first circulating circuit 12 and a path of the second circulating circuit 21 in both sides. These three pathes are coiled in spiral condition. The first circulating circuit is connected to the lower side and the second circulating circuit is connected to the upper side of a heat storage tank 10. The pump 22 in the second circulating circuit is controlled by the second hot-water temperature detector positioned above level from the centre of the heat storage tank, heating firstly the upper portion of the water up to the predetermined temperature secondly lower portion of water similarly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar heat utilization device that can be widely used, particularly in hot water supply equipment.

Structure of a conventional example and its problems FIG. 1 shows a conventional system. First, the heat collection circuit is compressor 1,
It is formed by connecting a heat exchanger 2, an expansion valve 3, and a heat collector 4 with piping, and sealing a refrigerant inside. Therefore, both solar heat and atmospheric heat can be collected using the refrigeration cycle. Further, the hot water supply circuit is formed by connecting a heat storage tank 5 and a circulation pump 6 with piping. The heat exchanger 2 in this case usually uses a double pipe system.

In this method, the heat collection and circulation is performed from the lower part of the heat storage tank, so that the boiling temperature characteristic is as shown in a in FIG. 2. In other words, if all the hot water in the heat storage tank 5 is used up by taking a bath at 8pm the night before, the temperature T6 of the water that will be boiled by collecting atmospheric heat by 6am the next morning is the average heat collection amount a...・・Book/h hot water temperature T22
...10, the capacity of the heat collection tank S...300, and the heat collection time...9 hours, the following equation holds true.

T6=T22+8291 In other words, it was about 28'Ct, and even for morning cooking, the optimum temperature for use was 35-45'Ct.

Therefore, in reality, the morning load was supplemented by other water heaters.

It was not practical because it could not be used as hot water.

Purpose of the Invention The present invention aims to improve the above-mentioned problems by dividing the heat storage tank into two and boiling a small amount of hot water to an appropriate temperature that can be used quickly, thereby making it possible to utilize cheap hot water heated by solar heat or atmospheric heat. The aim is to increase efficiency and improve usability.

Structure of the Invention The present invention uses a method of boiling by dividing the heat storage tank into two.
At the bottom is a first circulation circuit consisting of a first pump and a heat exchanger,
A second circulation circuit consisting of a second pump and a heat exchanger is arranged at the top, and both pumps are controlled by first and second hot water temperature detectors, respectively.

In addition, heat collection to the heat exchanger is configured to be carried out day and night by a heat collection circuit consisting of a compressor, a heat exchanger, an expansion valve, and a heat collector using a heat pump circuit using a refrigerant. There is.

Since this heat exchanger has a cylindrical shape in which three independent flat pipes are wound alternately in a helical shape, the first and second circulation circuits each act as a heat collecting circuit. The structure allows for heat exchange.

DESCRIPTION OF EMBODIMENTS Below, embodiments of the present invention will be explained with reference to the drawings.
In the figure, the heat collecting circuit is composed of an expansion valve 3, a heat collector 4, a compressor 1, and a heat exchanger 7, as in the conventional case. The heat exchanger 7 is connected to a refrigerant port 8 and a refrigerant outlet 9.

The heat storage tank 10 is of a push-up type with a water supply port 11 at the bottom and a hot water supply port 12 at the top, with lower circulation ports 13 and 14 at the bottom, and an upper circulation port 15 at a position that still divides the heat storage tank 10 into two. .16.

First inlet/outlet 17.18 of heat exchanger 7 and lower circulation inlet/outlet 1
3.14 are connected via the first pump 19 to form a first circulation circuit. A second circulation circuit is constructed between the second inlet/outlet 20.21 of the heat exchanger 7 and the upper circulation inlet/outlet 15.16 via the second pump 22. First,
The second pop 19.22 and the compressor 1 are controlled by the controller 23.
Start/stop is controlled by the first and second hot water temperature detectors 24 and 25 installed in the heat storage tank 1°.

The heat exchanger 7 is still configured using three copper pipes with a flat cross-section.

With the refrigerant passage 8 in the center, the passage 18 of the first circulation circuit and the passage 21 of the second circulation circuit are closely wound on both sides thereof in a concentric spiral shape.

To explain the operation of the embodiment of the present invention, the temperature at 10 pm is 10 t' under the same moxibustion conditions as in the conventional example.

When the second hot water temperature detector 25's OJ-''F set temperature 55 is lower than the set point, only the second circulation circuit is preferentially operated.In other words, the compressor 1 and the second pump 22 are started. The heat collector 4 collects the atmospheric heat and stores it in the upper part of the heat storage tank 10.
The temperature is increased only by 50t. Therefore, the temperature T6 detected by the second a temperature detector 25 at 6 o'clock the next morning changes with the characteristics shown in b during the night and rises to 46. That is, 600X9 T6/-□ = 46'c However, the lower water temperature T6'' at this time remains the water supply temperature of 10°C.

However, the temperature of the water used for morning cooking is 46'c.
It is enough to enjoy daily life using hot water in the bathroom, kitchen, etc.

After 6 o'clock, the temperature increases while collecting both solar heat and atmospheric heat, and around 9 o'clock, when the hot water reaches the set temperature of 55'C, the second pump 22 stops and prepares for the afternoon usage load.

Subsequently, the first pump 19 is started to boil the lower part of the heat storage tank 10 in the same way.

Therefore, the hot water temperature change of the first hot water temperature detector 24 is as shown in C. The water temperature T1a" at 6pm rises to about 36'C. When the hot water at 55 is used up for the load during bathing, it will become lukewarm, so if you reheat the bathtub a little only when taking a bath, the temperature will be appropriate. I can take a bath.

In addition, during the summer, the amount of hot water used decreases, and approximately 150 of the 300 tons of hot water is left over until the next day. At this time, the heat loss from the high-temperature remaining hot water to the atmosphere was extremely large, leading to a decrease in efficiency.

In this embodiment, in such a case, the O of the first hot water temperature detector 24 is
Setting the FF temperature to a low temperature of 20 to 30'C is very economical since there is no waste of collecting heat to compensate for heat radiation loss for several days.

Effects of the invention (1) Since the total capacity of the heat storage tank can be divided into two and the temperature of a small volume can be increased, hot water can be boiled to the appropriate temperature of 45'C in a short time. Therefore, even if you use up all the hot water the night before, you can still use the hot water for cooking the next morning, and enjoy a comfortable hot water life without having to refill it for anything other than taking a bath.

(2) If you only install a hotter bath pot, you can supply hot water every day using solar hot water for everything else, so there is no need for an auxiliary heat source such as a large boiler, and equipment costs can be reduced.

(3) Since the temperature of the upper and lower parts of the two-divided heat storage tank can be set arbitrarily, there is no heat radiation loss due to residual hot water, and the heat collection efficiency can be greatly improved.

(-Circuit switching can be performed with a single heat exchanger without complicated valve switching, etc., and a system can be provided at low cost and with fewer failures.

(5) Both circulation circuits are completely independent of the refrigerant passages.
Because it has a heavy-walled structure, even if there is a pinhole in the heat exchanger pipe, it will never flow into the hot water circuit, allowing you to use it with confidence as a complete and sanitary water heater.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional solar water heating system, and FIG. 2 is a top view and a vertical sectional view showing the operating state of the conventional system and the present invention. 1... Compressor, 3... Expansion valve, 4...
...Heat collector, 7...Heat exchanger, 10...
... Heat storage tank, 11 ... Water supply port, 12 ...
...Hot water inlet, 13.14...Lower circulation entrance,
15.16... Upper circulation entrance, 19...
...First pump, 22...Second pump, 24.
Old: 1st hot water temperature detector, 2S: 2nd hot water temperature detector. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) It consists of a heat collection circuit that uses a refrigerant, consisting of a compressor, a heat exchanger, an expansion valve, and a heat collector, and a hot water supply circuit that uses a push-up type heat storage tank with a water supply port at the bottom and a hot water supply port at the top. , a first circulation circuit is formed between a lower circulation inlet/outlet of the heat storage tank and the heat exchanger via a first pump, and a first circulation circuit is provided at a lower part of the heat storage tank to control on/off of the first pump. A second circulation circuit is formed between the upper circulation inlet and outlet of the heat storage tank and the heat exchanger via a second pump, and the start/stop control of the second pump is controlled by the hot water temperature detector. A solar heat water heater that boils the upper part of the heat storage tank to a predetermined water temperature and then boils the lower part of the heat storage tank, each of which is controlled by a second hot water temperature detector installed above the center of the heat storage tank. (2) In the heat exchanger, the refrigerant passage of the heat collecting circuit is placed in the center, and the passages of the first circulation circuit and the passage of the second circulation circuit are placed in close thermal contact with each other on both sides, and these three passages are The solar water heating device according to claim 1, which is wound in a spiral shape. (3) The solar hot water supply system according to claim 1, wherein the operating set temperature of the first hot water temperature sensor and the operating set temperature of the second hot water temperature sensor can be adjusted arbitrarily.