JPS6228302B2 - - Google Patents

Description

[Detailed description of the invention]

[Object of the Invention] (Industrial Field of Application) The present invention relates to an apparatus for utilizing the exhaust heat of a Stirling engine, and in particular is intended to utilize the exhaust heat of the Stirling engine as a heat source for hot water supply and air conditioning. (Prior Art) Conventionally, it has been widely practiced to obtain hot water by using the exhaust heat generated when a prime mover drives a generator. The released heat is used. (Problem to be solved by the invention) However, this prime mover is an internal combustion engine, and its emitted heat is approximately constant. Therefore, in order to prevent a decrease in the engine's thermal efficiency and for other technical reasons, it is necessary to reduce the exhaust heat. The temperature of the hot water available has been limited to a relatively limited range (for example, 70°C to 80°C). Therefore, the technical problem of the present invention is to make it possible to obtain hot water over a wide range of temperatures. [Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned technical problems, the technical measures taken in the present invention are: (a) A circulation pump that discharges cooling water from a discharge port. (b) a valve device comprising an inlet, a first outlet, a second outlet, and a third outlet, the inlet communicating with the discharge port of the circulation pump via a heat radiation section that is a low temperature section of the Stirling engine; (c) the above-mentioned (d) a first heat exchanger thermally connected to a heater serving as a high temperature section of the Stirling engine and having an inlet communicating with a first outlet of the valve device; a second heat exchanger having an inlet communicating with a second outlet of the valving device and an outlet of the first heat exchanger; and (e) an outlet of the second heat exchanger and a third outlet of the valving device. a radiator including a fan having a communicating inlet and an outlet connected to an inlet of the circulation pump; the inlet of the valve device is connected to the first outlet of the valve device depending on the water temperature of the heat storage tank; , the exhaust heat utilization device for the Stirling engine is configured to communicate with either one of the second outlet and the third outlet. (Operation) The above technical means operates as follows. That is, the cooling water is distributed through (1) the circulation pump 13, the radiator 9, and the first heat exchanger 1;
4. A first system that circulates through the second heat exchanger 19 and the radiator 18, (2) Circulation pump 13, radiator 9, and second heat exchanger 1
9 and the radiator 18; (3) the circulation pump 13, the radiator 9 and the radiator 1;
a third system that circulates water in the heat storage tank;
6 is automatically activated to automatically determine which system the cooling water flows into, making it possible to obtain hot water over a wide range using exhaust heat. (Example) Hereinafter, one example of the present invention will be described based on the accompanying drawings. In the principle flow path diagram of the Stirling engine shown in FIG. A compression space 6 is defined by a compression piston 3 reciprocatably mounted therein. Working fluid such as helium, hydrogen, freon, water, etc. moves between the expansion space 5 and the compression space 6 through a heater 7 as a high temperature section, a recuperator 8 and a radiator 9 as a low temperature section. The expansion piston 1 and the compression piston 3, which move up and down with different phase differences, are connected to a crankshaft 10 that rotates integrally with a generator 11. By heating the heater 7 with flame, solar heat, or other means and radiating heat through the radiator 9 with cooling water, isothermal compression, isovolumic heating, isothermal expansion, and isovolumic cooling of the working fluid are performed. The Stirling engine serves as a prime mover and drives the generator 11. Further, if the generator 11 is operated as a motor, the Stirling engine becomes a refrigerator, and the heater 7 becomes a freezer in which freezing occurs. In such a Stirling engine, high-temperature and low-temperature exhaust heat are obtained from the heater 7 and the radiator 9, respectively. FIG. 2 shows an example of a device that effectively utilizes this exhaust heat. That is, the radiator 9 of the Stirling engine has the discharge port 1 of the circulation pump 13.
Cooling water discharged from 3a is supplied, and this cooling water exchanges heat with the working fluid and enters the inlet 1 of the valve device 16.
6a. The valve device 16 has a first outlet 1
6b, a second outlet 16c and a third outlet 16d, the first outlet 16b communicating with the inlet 14a of the first heat exchanger 14 which is thermally connected to the heater 7. The second outlet 16c of the valve device 16 and the outlet 14b of the first heat exchanger 14 are connected to the inlet 1 of the second heat exchanger 19 which is thermally connected to the water in the heat storage tank 12.
It communicates with 9a. Outlet 1 of second heat exchanger 19
9b and the third outlet 16c of the valve device 16, the bypass passage 15 communicates with the inlet 18 of the radiator 18.
a, and is in communication with the outlet 18b of the radiator 18.
is in communication with the suction port 13b of the circulation pump 13. Therefore, in the valve device 16, the heat storage tank 12
The inlet 16a is automatically switched to communicate with any one of the first outlet 16b, the second outlet 16c, and the third outlet 16d depending on the set temperature and the actual temperature corresponding to the usage of the water inside. It's becoming like that. That is, hot water at a relatively high temperature, for example, 85°C, is used as a heat source for heating or cooling in the heat storage tank 12.
When the cooling water is to be stored in the water, the valve device 16 is controlled so that the cooling water that has passed through the radiator 9 flows to the first heat exchanger 14 thermally connected to the heater 7 by operating an air conditioning switch (not shown). It's becoming like that. In this case, when the temperature of the heat storage tank 12 is less than the predetermined 85° C., the auxiliary heating burner 17 provided in the heat storage tank 12 is ignited to heat the heat storage tank 12. Next, when the temperature of the heat storage tank 12 is overheated to a predetermined temperature of 85°C or higher, the valve device 16 is switched to the bypass circuit 15 side by a thermostat or the like, and at the same time, the fan of the radiator 18 is activated to radiate the residual heat of the water temperature to the atmosphere. do. In addition, the heat storage tank 12
Until the temperature of the cooling water reaches 85°C, the cooling water is not cooled by the fan of the radiator 18 and is returned to the radiator 9 via the pump 13. Even at a high temperature of 84℃,
It has little effect on the Sterling institution. On the other hand, when trying to obtain hot water at a relatively low level, for example, 40°C, for hot water supply, the valve device 16 is controlled so that the cooling water that has passed through the radiator 9 flows directly to the heat storage tank 12. It's becoming like that. In this case, the temperature of the heat storage tank 12 is, for example, 40
℃ or more, the valve device 16 is closed to the bypass circuit 15 by a thermostat (not shown) or the like.
At the same time, the fan of the radiator 18 is activated to radiate residual heat from the water temperature to the atmosphere. Also,
When the temperature of the heat storage tank 12 drops significantly below a predetermined temperature due to the use of a large amount of hot water, for example, when it falls below 30°C, the valve device 16 switches to the first heat exchanger 14 side, and the cooling Heat the water further. Note that when the cooling water flows through the second heat exchanger 19,
All of the heat absorbed by the cooling water from the radiator 9 (or the radiator 9 and the heater 7) of the Stirling engine is released into the water in the heat storage tank 12, and the cooling water at the outlet 19b of the second heat exchanger 19 is The temperature is
Since the temperature is approximately equal to the temperature of the cooling water discharged from the discharge port 13a of the circulation pump 13, in this case, there is little need to further cool the cooling water and return it to the suction port 13b of the circulation pump 13. 18 fans are no longer in operation. Furthermore, when the temperature of the cooling water supplied to the second heat exchanger 19 becomes equal to the temperature of the heat storage tank 12 that has reached a predetermined temperature, heat is not radiated from the cooling water to the heat storage tank 12, so the cooling water remains as it is. passes through the radiator 9 at a temperature of . At this time, since the cooling water further absorbs heat from the heat radiator 9, the temperature becomes higher than before, passes through the second heat exchanger 19, and radiates heat to the heat storage tank 12. Then, the temperature of the heat storage tank 12 becomes higher than a predetermined value, and the cooling water passes through the bypass circuit 15 and is cooled by the fan of the radiator 18. An example of the above operation is summarized in Table 1.

〔Effect of the invention〕

As described above, the present invention provides: (a) a circulation pump that discharges cooling water from a discharge port; (b) an inlet, a first outlet, a second outlet, and a third outlet, the inlet being a Stirling engine. (c) an inlet that is thermally connected to a heater that is a high temperature section of the Stirling engine and communicates with a first outlet of the valve device; (d) a second heat exchanger having an inlet thermally coupled to the water in the heat storage tank and communicating with the second outlet of the valve device and the outlet of the first heat exchanger; and (e) a radiator comprising a fan, the inlet communicating with the outlet of the second heat exchanger and the third outlet of the valve device, the outlet being connected to the inlet of the circulation pump. , the inlet of the valve device communicates with any one of the first outlet, the second outlet, and the third outlet of the valve device depending on the water temperature of the heat storage tank, so that the exhaust heat utilization device of the Stirling engine was constructed. According to this configuration, the cooling water is distributed between (1) the circulation pump 13, the radiator 9, and the first heat exchanger 1;
4. A first system that circulates through the second heat exchanger 19 and the radiator 18, (2) Circulation pump 13, radiator 9, and second heat exchanger 1
9 and the radiator 18; (3) the circulation pump 13, the radiator 9 and the radiator 1;
According to the set temperature and the actual temperature of the water in the heat storage tank 2, the valve device 16 automatically operates to control which system the water flows through. Since cooling water flows automatically, hot water can be obtained over a wide range using waste heat. In addition, the cooling water flowing through the first system releases all the heat absorbed from the radiator 9 and the first heat exchanger 14 into the water in the heat storage tank 12 at the second heat exchanger 19, and The cooling water flowing through the third system completely releases the heat absorbed from the radiator 9 into the water in the heat storage tank 12 at the second heat exchanger 19, and the cooling water flowing through the third system exhausts the heat absorbed from the radiator 9 into the water in the heat storage tank 12. Since it is designed to be cooled by a fan when passing through 18, in the radiator 9,
There is a large temperature difference between the cooling water and the heat released by the Stirling engine, which increases the cooling effect in the heat radiation section of the Stirling engine.

[Brief explanation of the drawing]

Figure 1 is the principle flow path diagram of a Stirling engine.
and FIG. 2 is a flow path diagram showing an embodiment of the exhaust heat utilization device for a Stirling engine according to the present invention. 7... Heater, 9... Heat radiator, 12... Heat storage tank, 13... Circulation pump, 14... First heat exchanger, 16... Valve device, 16a... Inlet, 16b...
...first outlet, 16c...second outlet, 16d...third outlet, 18...radiator, 19...second heat exchanger.

Claims (1)

[Claims] 1 (a) A circulation pump that discharges cooling water from a discharge port; (b) An inlet, a first outlet, a second outlet, and a third outlet, and the inlet is connected to a low-temperature section of a Stirling engine. a valve device that communicates with the discharge port of the circulation pump via a barrel heat dissipation section; (c) an inlet that is thermally connected to a heater that is a high temperature section of the Stirling engine and that communicates with the first outlet of the valve device; (d) a second heat exchanger having an inlet thermally coupled to the water in the heat storage tank and communicating with the second outlet of the valve device and the outlet of the first heat exchanger; and (e) a radiator comprising a fan having an inlet communicating with the outlet of the second heat exchanger and the third outlet of the valve device, the outlet of which is connected to the inlet of the circulation pump; An exhaust heat utilization device for a Stirling engine, wherein an inlet of the device communicates with any one of a first outlet, a second outlet, and a third outlet of the valve device depending on the water temperature of the heat storage tank.