JPS60164177A - Solar heat collecting device - Google Patents

Abstract

PURPOSE:To enable to realize the highly efficient heat collection by a method wherein an independent heat pump circuit having a condenser in a hot water storage tank is jointly provided with a solar heat collecting device and the running and stop of a compressor are controlled by the liquid level in a return pipe. CONSTITUTION:Because the circulating power of a loop type heat pipe develops during no insolation, the level of working liquid in a return pipe becomes lower, resulting in causing a float 8 in a liquid receiving tank 7 to issue a signal representing the float being at the lower position. A compressor is set to start its running under the above-mentioned case, resulting in enabling to collect heat by utilizing the heat pump circuit mainly by employing the air as a heat source.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a solar water heater having both a loop heat pipe action and a heat pump action.The present invention relates to the structure of a conventional example and its problems. , as shown in FIG. 1, a heat collector 1, a heat exchanger 3 installed inside a hot water storage tack 2 provided above the heat collector 1, an outgoing pipe 4, and an O/main pipe 5. The circuit was constructed as a closed circuit, the pressure inside the circuit was reduced, and a working fluid 6 as a latent heat medium was sealed. In this configuration, when there is solar radiation, the solar heat received by the collector 1 is transferred to the hot water tank 2 and warms the water 7 inside, or when there is no solar radiation, i (h + sky) had the problem that it could not be used because the temperature did not rise at all.

OBJECT OF THE INVENTION The present invention solves such conventional problems.When there is no sunlight, or when there is sunlight but the temperature inside the hot water storage tank becomes high, the heat pump is used to collect heat from the air, and By obtaining start/stop signals for heat pump operation using a liquid level detection means in which a float is suspended in the working fluid provided in the loop heat pipe circuit, heat pump operation can be performed easily and with high reliability. The purpose is to switch between heat pipe operation and heat pipe operation.

Structure of the Invention In order to achieve this object, the present invention mainly consists of a heat collector that collects solar heat and a heat exchanger installed in a hot water storage tank provided above the heat collector in a loop-type heat pipe. The above-mentioned heat exchanger or a separate heat exchanger is installed in the hot water storage tank to mainly collect atmospheric heat using a heat pump circuit and then condense the heat transfer medium, and the heat exchanger or a separate heat exchanger is installed in the middle of the main pipe at a position higher than the heat collector. The liquid level detection means detects changes in the magnetic field of a float containing a magnetic material inserted inside the float and a float provided outside. It consists of two parts: a coil or reed switch, a float movable area, and a fence provided at the bottom.

With this configuration, when solar radiation is large, solar heat is collected by the loop heat pipe, heat is transferred from the collector to the heat exchanger, and the condensate is guided to the lower part of the collector through the source tube. In this case, the liquid level in the return pipe, if the loop type heat pipe is working, will be compared to the state when it is not working,
In order to obtain circulation force, the liquid must rise, resulting in an obvious difference in liquid level height. In this case, the float of the liquid level detector floats and sends a signal to the controller due to changes in the magnetic field. Therefore, when the liquid level inside the refractory is high, solar heat collection is occurring and the heat pump does not operate, but when there is no sunlight or the temperature inside the hot water storage tank rises, the loop heat pipe is activated. If not, the liquid level in the return pipe will be equal to the liquid level in the heat collector, and the float in the liquid level detector will fall to the bottom. In that case, a signal will be sent to start the compressor in the heat pump circuit. It is possible to collect atmospheric heat by operating a heat pump.

Description of examples An embodiment of the present invention will be described below with reference to FIG.

In Fig. 2, 1 is a heat collector that mainly collects solar heat, 2 is a hot water storage tank located above the heat collector 1, and has a condensing heat exchanger 3 installed inside. The tube 5 constitutes a closed circuit. After evacuation, the closed circuit is filled with a working fluid 6, which is a latent heat medium, to the extent that it approximately fills the entire heat collector. In addition, in the middle of the raw tube 5, the height is the same as the top of the heat collector,
Alternatively, a liquid receiving tank 7 is provided at a high position, and a float 8 is disposed inside the tank 7. Further, the float includes a magnetic material in whole or in part, and the specific gravity of the entire float 8 is configured to be smaller than the specific gravity of the hydraulic fluid. On the other hand, a coil 9 or a reed switch that detects changes in the magnetic field is installed outside the liquid receiving tank 7, so the float moves up and down according to changes in the liquid level. A signal for starting and stopping the compressor 10 can be issued via the controller 12. Moreover, net-like fences 16 are provided at the upper and lower parts of the movable range of the float 8 in the liquid receiving tank 7, so that the float 8 cannot pass through.

In the above configuration, when the amount of solar radiation is large, or when the temperature difference between the surface temperature of the heat collector and the water temperature in the hot water storage tank is large, solar heat is absorbed in the heat collector, and the working fluid 6 inside is It evaporates and becomes a scum, which passes through the outgoing pipe 4 and is led to the heat exchanger in the hot water storage tank 2. When cooled in the hot water storage tank 2, the waste in the heat exchanger condenses and liquefies, flows down the heat exchanger tilted in one direction, passes through the raw pipe 5 and the liquid receiving tank 7, and reaches the 1z section of the heat collector. I am guided. ) When the solar radiation is large, or when the temperature difference between the surface temperature of the heat collector and the water temperature in the hot water storage tank 2 is large, the loop is operated as a heat pipe and the source is used to obtain the circulating force of the working fluid. The amount of liquid in the pipe 5 increases, and therefore the level of the working liquid in the liquid receiving tank 7 formed in a part of the recess changes depending on the amount of solar radiation.

As in the above embodiment, the t♀ child 8 is provided inside the liquid receiving tank 7, and this signal is generated by floating when solar radiation exceeding a certain daily amount is obtained. The operation of the compressor 10 of the heat pump circuit can be stopped via the controller 12, and when there is sunlight, heat can be collected by the heat collector without power. In addition, when there is no sunlight, or when the temperature difference between the surface temperature of the heat collector 1 and the water temperature in the hot water storage tank 2 is small, the circulating force of the loop heat pipe is not generated, so the working fluid in the return pipe is The liquid level height becomes low, and therefore the float 8 in the liquid receiving chamber emits a signal indicating that it is located downward. In this case, by starting the operation of the compressor 10 of the heat pump circuit, heat can be collected using the heat pump circuit mainly from the air heat source. In this way, the present invention provides a liquid level detection part in a part of the original pipe of the loop type heat pipe, and furthermore, the float is placed directly in the working liquid, so the working liquid level can be detected reliably. Because it is vacuumed, there is no generation of oxide scale, and there are also fences on the top and bottom of the float to act as a filter, ensuring long-term operation and ensuring heat pump operation using highly reliable means. Next, another embodiment of the liquid receiving tank 7 is shown in FIG. 3.

In Fig. 3, reference numeral 4 (11116) is constituted by a pawl portion 16 that protrudes into the inside of the liquid receiving tank.It also restricts only the second and lower positions of the float 8 without blocking the passage of the working liquid. However, other configurations including this embodiment may be used.

Further, the evaporator 13 and condenser 14 of the heat pump circuit in this embodiment are completely independent of the evaporator 1 and condenser 3 of the loop heat pipe circuit, and the expansion valve 15 constitutes the heat pump circuit. However, as another example,
Either or both of the evaporator and condenser may be a common system.

Effects of the Invention As described above, the solar heat collector of the present invention provides the following effects.

(1) Reliable detection is possible because the solar heat collection state is directly detected by a float provided in the liquid in the return pipe of the loop heat pipe.

(2) Since the float is placed in a closed circuit filled with hydraulic fluid after being evacuated, there is no fear of oxidized scale, etc., and stable operation over a long period of time is guaranteed.

(3) At the top and bottom of the float, there are fences that restrict the movement range and provide a filter effect to prevent foreign matter from entering.
Long-term reliability can be ensured.

(4) Since fences are provided at the top and bottom of the float, there is no risk of blocking the float or the circuit during the vacuuming process of the loop heat pipe.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional solar heat collecting device, Fig. 2 is a block diagram showing one embodiment of the solar heat collecting device of the present invention, and Fig. 3 is a sectional view showing another embodiment of the liquid receiving tank. It is. 1... Heat collector, 2... Hot water storage tank, 3 ・
Heat exchanger, 4...Outgoing pipe, 5...Main pipe, 6.
... Hydraulic fluid, 8... Float, 9-... Coil or reed switch 1o ... Compressor, 16...
・Paulownia. Figure 1

Claims (1)

[Claims] A heat collector that evaporates a working fluid as a latent heat medium mainly by solar heat; a hot water storage tank located above the heat collector and containing a condensing heat exchanger; and a connection between the heat collector and the heat exchanger. an outgoing pipe and a main pipe constituting a closed circuit, the heat exchanger or a separate heat exchanger that condenses a latent heat medium after collecting mainly atmospheric heat in the hot water storage tank; It consists of a liquid level detecting means for starting and stopping the compressor in the heat pump circuit provided inside the heat pump circuit, and the liquid level detecting means includes a float containing a magnetic material inserted inside the float and a magnetic field change provided outside. A solar heat collecting device comprising a coil or reed switch that detects the temperature of the float, and fences provided at the upper and lower parts of the float movable range.