JPH06241685A - Air conditioning and hot water feeding system utilizing solar cell - Google Patents

Abstract

PURPOSE:To provide an effective utilization of electrical power generated by a solar cell without being applied as surplus energy by a method wherein a required electrical power is compared with an electrical power of a solar cell device generating at a specified day, surplus electrical power generated by the solar cell device is reversely flowed back to an electrical power company through an inverter. CONSTITUTION:A judging means confirms that a capacity of a battery 1b is sufficiently present in response to a capacity sensor 35 and calculates an electrical power value of a solar cell panel 1a generated at a specified day in response to data of an amount of sun shining got from a sun shining amount sensing sensor 36. An electrical power value of the solar cell panel 1a is compared with a requisite electrical power value. In the case that it is judged that surplus electrical power is generated at the solar cell panel 1a in reference to the result of comparison, a supplying location changing- over switch 1c is changed over in such a manner that an electrical power is flowed from the solar cell panel 1a and the power is flowed back to the electrical power supplying part B with such as arrangement as above, since the surplus electrical power is returned back to the electrical power supplying location B (electrical power company), resulting in that energy of solar cell can be effectively utilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning and hot water supply system using a solar cell that operates with electric power obtained from the solar cell.

[0002]

2. Description of the Related Art In recent years, many houses have been constructed with an air conditioning system for cooling and heating each room and a hot water supply system for supplying hot water stored in a hot water storage tank to each water supply space in a home.

By the way, the air conditioning and hot water supply system is
Normally, each is operated by commercial power, and the consumption of commercial power in general households tends to increase. As an alternative to this commercial power, a solar cell has been developed as one that can effectively use solar energy, have high energy efficiency, and can be converted into highly versatile power.

As the price of solar cells has decreased and the electromotive force per unit area and the amount of solar radiation has increased due to technological innovation in recent years, a technique for utilizing the electric power obtained from the solar cell system for an air conditioning system and a hot water supply system has been put into practical use. It has entered the stage of incarnation.

[0005]

However, the air-conditioning and hot-water supply system using the solar cell currently developed has the following problems.

First, the solar cell generates a considerable amount of electric power in a time zone when there is a sufficient amount of solar radiation, such as in the midsummer daytime. However, apart from the power supply to the hot water supply and the air conditioning system, the filling of the battery to a predetermined capacity is completed, and the electromotive force generated is stopped as the surplus energy. That is, the solar cells have not been effectively used during the time period when electric power is generated.

Secondly, the hot water storage tank used in the hot water supply system is a single tank, and in this single hot water storage tank, the water in the tank is heated to high temperature water, and the high temperature water is It is designed to be supplied to the supply side. Therefore, if the hot water in the tank does not easily rise to the predetermined temperature, the hot water supply to the supply side may have to be temporarily interrupted, and an efficient hot water supply system has not been obtained. .

The present invention has been made in view of the above circumstances, and makes effective use of the electric power generated by a solar cell generated in a time zone having a sufficient amount of solar radiation, without using it as surplus energy, and the daily hot water supply operation. It is an object of the present invention to provide an air conditioning and hot water supply system using a solar cell capable of performing normal and efficient operation.

[0009]

An air-conditioning hot water supply system using a solar cell according to the present invention comprises a solar cell unit which can obtain electric power by irradiation of sunlight, and a heat pump section which is operated by electric power supply from the solar cell unit. Two heat storage tanks for arranging the radiator and heat absorber of the heat pump in the tank to store the internal water as high temperature water and cooling water, and air conditioning for heating and cooling the room by circulating high temperature water or cooling water An air conditioning unit having a machine, a hot water storage tank in which a predetermined amount of supply water is stored in the tank, and two or more tanks are installed to absorb heat from the heat storage tank on the high temperature water side of the air conditioning unit in alternate cycles, and a solar cell A controller for related control of the unit, control of the air conditioning unit, and control of supplying heat quantity to any of a plurality of hot water storage tanks every other day, and an inverter for converting the electric power obtained from the solar cells into AC It is provided with a door.

Then, the control device predicts in advance the electric power value necessary for the operation of the air conditioning unit on the next day, compares the necessary electric power value with the electric power value of the solar cell unit generated on the day, and Based on the comparison result, a reverse power flow means is provided for causing the excess power generated by the solar cell unit to flow backward to the power company via the inverter.

[0011]

According to the air conditioning hot water supply system using the solar cell of the present invention, an energy saving air conditioning hot water supply system is provided. In the reverse flow means of the control device,
The power value necessary for the operation of the air conditioning unit on the next day is predicted in advance, and this necessary power value is compared with the power value of the solar cell unit generated on the day. Then, when the power value of the solar cell unit is large as a result of this comparison,
In a time zone desired by the electric power company (during summer daytime), the surplus electric power of the solar cell unit can be converted into an alternating current by the inverter and flow backward to the electric power company.

Further, in this system, since high temperature water is stored in two or more hot water storage tanks every other day, high temperature water can be constantly supplied to the space around the water.

[0013]

EXAMPLE An example of an air conditioning system using the solar cell of the present invention will be described with reference to FIGS. As shown in FIG. 1, the present invention is directed to a solar cell unit 1, an air conditioning unit 2 for cooling and heating indoors, a hot water supply unit 3 for supplying high-temperature water to a space around the water, a solar cell unit 1, and an air conditioning unit. 2 and the hot water supply unit 3 are related to each other, and a control device 4 controls the electromotive force obtained from the solar cell unit 1 as an alternating current.

The solar cell unit 1 includes a solar cell panel 1a installed on the roof of a house, a battery 1b charged with an electromotive force generated by the solar cell to a predetermined capacity, and a solar cell panel 1a and a battery 1b. It is configured with the supply destination changeover switch 1c provided.

The supply destination changeover switch 1c is a device for changing the flow direction of the electromotive force generated in the solar cell panel 1a to the battery 1b side or the inverter 5 side in response to an instruction signal sent from the control device 4. A backflow prevention diode (not shown) is provided between the solar cell panel 1a and the supply destination changeover switch 1c. In addition, the inverter 5 includes a supply destination changeover switch 1c.
When the electromotive force generated in the solar cell panel 1a flows due to the switching operation, the device converts the direct current into the alternating current and reversely flows the power to the power supply B. Here, the power supply B indicates a power company that supplies power to each home.

The battery 1b is composed of a lead storage battery,
The electromotive force generated in the solar cell panel 1a is charged, and the charging capacity is about twice as much as the daily power supply by the solar cell panel 1. Then, the battery 1 b supplies power to the air conditioning unit 2 via the heat pump operation switch 6.

The air conditioning unit 2 has a heat storage tank 1 in which water in the tank is heat-exchanged with the heat exchangers 7 and 8 by an apparatus main body 9 having heat exchangers 7 and 8, circulation pipes 7a and 8a, and a pump 15.
0 and 11, and the hot water or cooling water in the heat storage tanks 10 and 11 to the pipes 19a and 19b (when circulating the hot water),
It is roughly configured with circulation control valves 13 and 14 that circulate toward the air conditioner 12 installed in the room via 20a and 20b (when circulating cooling water). A heat medium such as ammonia circulates inside the apparatus body 9 to radiate heat from the heat exchanger 7 (hereinafter referred to as radiator 7), whereby the heat storage tank 10 (hereinafter referred to as heat radiation side heat storage tank 10) is operated.
The water inside rises in temperature and heat exchanger 8 (hereinafter heat absorber 8
Say ), The water inside the heat storage tank 11 (hereinafter referred to as the heat absorption side heat storage tank 11) is cooled.

The opening / closing of the circulation control valves 13 and 14 is controlled by the control signal sent from the apparatus main body 4, and the pump 15 is actuated, whereby the hot water of the heat radiation side heat storage tank 10 or the heat absorption side heat storage tank 11 of the heat absorption side heat storage tank 11 is stored. Cooling water circulates. As a result, the air conditioner 12 operates as a heating operation or a cooling operation.

Further, the hot water supply unit 3 includes two hot water storage tanks 1.
6, 17 and the heat exchangers 20 and 21 arranged inside the hot water storage tanks 16 and 17, and the pipe 2 connected to the heat exchangers 20 and 21.
2a, 22b, 23a, and 23b, and a circulation control valve 18 that circulates the high-temperature water heated in the heat radiation side heat storage tank 10 to the supply destination of either the hot water storage tank 16 or the hot water storage tank 17. The hot water storage tanks 16 and 17 have pipes 24a and 2
Water is supplied from 4b.

The circulation control valve 18 is opened / closed by a control signal sent from the control device 4, whereby hot water is transferred from the heat radiation side heat storage tank 10 to the heat exchanger 20 (or the heat exchanger 21). As it circulates, a heat exchange step (a step of raising the temperature of the water in the tank) is performed in the hot water storage tank 16 (or the hot water storage tank 17).

Here, the control device 4 sends a switching control signal to the circulation control valve 18 in alternate cycles. As a result, one hot water storage tank 16 (or hot water storage tank 1
The heat exchange step is performed in 7), and the hot water storage tank 17 (or the hot water storage tank 16) has already completed the heat exchange step the day before and has stored high-temperature water. is doing. Therefore, every other day, the hot water storage tanks 16 and 17
Since the hot water is stored in the hot water, the hot water can be constantly supplied to the space around the water, and a stabilized hot water supply system can be provided.

On the other hand, the control device 4 has a capacity sensor 35, which is composed of a voltage sensor or the like, for detecting the capacity of the battery.
And a solar cell panel 1 composed of a photo sensor, etc.
Is connected to a solar radiation amount detection sensor 36 which is installed in the vicinity of the sensor for detecting the amount of solar radiation, and a detection signal obtained from each sensor is sent in real time.
Then, the control device 4 is provided with a control means 30 that sends an operation signal to the supply destination changeover switch 1c, the heat pump operation switch 6, and the circulation control valves 13, 14, 18 based on the information obtained from the sensor. (See FIG. 2).

Here, in the control device 4, as shown in FIG. 2, the temperature data section (reverse power flow means) 31, the power predicting means (reverse power flow means) 32 for predicting the required power for the next day, and the judging means. (Reverse flow means) 33 is provided.

The temperature data section 31 has a predetermined period (for example,
It stores temperature change data (average value of outside air temperature and indoor temperature) for one year). By setting a predetermined date, the temperature change prediction data for one day can be read. ing.

Further, the power predicting means 32 reads the temperature prediction of the next day from the temperature data section 31 and refers to the temperature change of the data for one day to keep the room at a predetermined temperature as shown in FIG. Thus, the electric power value DE required for the operation of the air conditioning unit 3 is calculated.

Further, the judging means 33 is the capacitance sensor 3
5 confirms that the capacity of the battery 1b is sufficient, and based on the solar radiation amount data obtained from the solar radiation amount detection sensor 36, as shown in FIG. 4, the power value of the solar cell panel 1a generated on the day ( A power value obtained by adding SE1 and SE2) is calculated, and the power value of the solar cell panel 1a is compared with the required power value DE. When it is determined from the comparison result that the surplus power SE2 is generated in the solar cell panel 1a, a control signal is sent to the control means 30. The control means 30 sends a signal to the supply destination changeover switch 1c based on the control signal from the determination means 33, and switches the supply destination changeover switch 1c so that the electric power SE2 flows from the solar cell panel 1a to the inverter 5. Then, the electric power converted into alternating current by the inverter 5 flows backward to the electric power supply B. Here, since the electric power company (electric power supply B) is in a power shortage state during the daytime in the midsummer, it is possible to sell the electric power at a high price by causing a reverse flow in this time period (a time period desired by the electric power company).

Further, according to the comparison result, the solar cell panel 1
When it is determined that there is no excess power in a, the control signal is not sent to the supply destination changeover switch 1c, and the power supply direction of the supply destination changeover switch 1c is set to the battery 1b side.

Therefore, the judgment means 33 predicts in advance the electric power value required for the operation of the air conditioning unit 2 (including the hot water supply unit 3) on the next day, and the electric power of the solar cell unit 1 generated on the day is predicted from this necessary electric power value. When the value is large, the surplus power can be converted to AC by the inverter 5 and flow backward to the power supply B (electric power company) side, so the surplus energy generated in the solar cell unit 1 can be fully used. Has been done.

As can be easily understood from the above description, the control device 4 controls the operation of the solar cell unit 1, the air conditioning unit 2 and the hot water supply unit 3 by the control means 30, and the power prediction means 32. The temperature data section 31 is read in advance to predict the electric power value required for the operation of the air conditioning unit 2 (including the hot water supply unit 3) on the next day, and the judgment means 33 compares the electric power value with the necessary electric power value to generate a solar cell on the day When the electric power value of the unit 1 is large, the surplus electric power can be converted into an alternating current by the inverter 5 and flow backward to the electric power supply B (electric power company) side. The solar cell can be effectively used without making the generated electric power of the solar cell unit 1 into surplus energy.

In addition, since the hot water is stored in the hot water storage tanks 16 and 17 every other day in this system, it is possible to constantly supply the hot water to the space around the water and to provide a stabilized hot water supply system. You can

In this embodiment, the two hot water storage tanks 16 and 17 are installed, but the same effect can be obtained even if more hot water storage tanks are installed.

[0032]

As described above, the air-conditioning hot water supply system using the solar cell of the present invention can provide an air-conditioning hot water supply system in which energy saving is achieved, and the control device can be preliminarily provided with air conditioning for the next day. Predict the power value required for unit operation, compare this required power value with the power value of the solar cell unit occurring on the day,
On the basis of the comparison result, since the reverse power flow means for causing the excess power generated by the solar cell unit to flow backward to the power company via the inverter is provided, when the power value of the solar cell unit is large, In the time zone desired by the electric power company, the surplus electric power of the solar cell unit can be converted into an alternating current by the inverter to cause the electric power company to reverse flow. Therefore, it is possible to effectively use the solar cell system without making the electric power of the solar cell unit generated in a time zone having a sufficient amount of solar radiation into surplus energy.

Further, in this system, since high temperature water is stored in two or more hot water storage tanks every other day, it is possible to constantly supply high temperature water to the space around the water, thus providing a stabilized hot water supply system. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an air conditioning hot water supply system using a solar cell of the present invention.

FIG. 2 is a block diagram showing a control device of the present invention.

FIG. 3 is a diagram showing the electric power required to operate the air conditioning system on the next day, corresponding to time.

FIG. 4 is a diagram showing electric power generated by the solar cell system on the day corresponding to time.

[Explanation of symbols]

 1 Solar Cell Unit 2 Air Conditioning Unit 3 Hot Water Supply Unit 4 Control Device 5 Inverter 7 Heat Exchanger (Radiator) 8 Heat Exchanger (Heat Absorber) 10 Heat Storage Tank (Radiator Side) 11 Heat Storage Tank (Heat Absorber Side) 13, 14 , 18 Circulation control valve 16, 17 Hot water storage tank 30 Control means 31 Air temperature data section (reverse power flow means) 32 Electric power prediction means (reverse power flow means) 33 Judgment means (reverse power flow means) 35 Capacity sensor 36 Solar radiation detection sensor

Claims (1)

[Claims] 1. A solar cell unit that obtains electric power by irradiation of sunlight, a heat pump unit that operates by power supply from the solar cell unit, and a radiator and a heat absorber of the heat pump unit are arranged in a tank. An air conditioning unit having two heat storage tanks that store the internal water as high temperature water and cooling water and an air conditioner that heats and cools the room by circulating the high temperature water or cooling water, and a predetermined amount of water in the tank. A hot water storage tank that stores the supply water and that absorbs heat from the heat storage tank on the high-temperature water side of the air conditioning unit in alternate cycles, and controls the solar cell unit, air conditioning unit, and multiple hot water in alternate cycles. It is equipped with a controller that controls the supply of heat to one of the tanks, and an inverter that converts the electric power obtained from the solar cells into an alternating current. Predict the power value required for unit operation, compare this necessary power value with the power value of the solar cell unit occurring on the day, and based on the comparison result, the surplus generated by the solar cell unit. An air conditioning and hot water supply system using a solar cell system, comprising: a reverse flow means for reversely flowing the electric power of the above into an electric power company through the inverter.