JP2006179681A - Heat supply system utilizing photovoltaic power generation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat supply system utilizing a photovoltaic power generation, in which, in particular, in an independent power supply system such as a hut, etc., a loss of power energy is restrained without charging or discharging a storage battery. <P>SOLUTION: Any or all of power generated by a solar battery in the daytime is classified into a charge portion A stored in the storage battery and a non-charge portion B not stored in the storage battery, and the power of the non-charge portion B is supplied to a cryogenic power generator via a converter and a panel board for operation in the daytime to make ice, whereby it is cool-stored as cryogenic energy and this cool-stored cryogenic energy is used for air conditioning. Further, the power of the non-charge portion B is supplied to a thermal power generator via the converter and the panel board for operation in the daytime to generate hot water, whereby it is heat-stored as thermal energy and this heat-stored thermal energy can also be used for supplying hot water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a solar power generation-use heat supply system that combines a solar power generation system and a heat supply device.

Conventionally, solar power is used to generate direct-current power from sunlight, this direct-current power is converted into alternating current by an inverter such as a power conditioner, and then output and supplied to an indoor load via a distribution board. A photovoltaic power generation system is known in which power is reversely flowed (sold) to the commercial power supply side through grid interconnection. Further, for example, Patent Document 1 discloses a technique for operating a heat pump using electric power generated by a solar cell and using the generated heat and heat and storing the heat and cold in a cold storage and heating device.
Japanese Patent Laid-Open No. 6-101931

  In an independent power supply system such as a mountain hut, electric power generated by a daytime solar cell is used, and surplus power is charged in a storage battery. When the solar cell cannot generate electricity such as in the morning or at night, the power stored in the storage battery is discharged and used. Moreover, the electric power discharged from the storage battery is supplied to the night air conditioner for operation, or the hot water supply device is supplied to make hot water.

  In such an independent power supply system, conventionally, the surplus power out of the power generated by the daytime solar cell is charged in the storage battery. The electric power charged in the storage battery is used in the morning or at night as described above, but there is a problem that the loss of electric power energy becomes large because charging / discharging is performed through the storage battery.

  The present invention is made in order to solve such a problem that has occurred in the past, and provides a heat supply system using photovoltaic power generation that can suppress loss of power energy without charging and discharging via a storage battery. For the purpose.

  As means for achieving the above-mentioned object, claim 1 of the present invention is divided into a charged part in which part or all of the electric power generated by the daytime solar battery is stored in the storage battery and a non-charged part not stored in the storage battery. The solar power generation heat supply system is characterized in that the non-charged power is supplied to a daytime refrigeration generator for ice making, and is stored as refrigeration energy, and the refrigeration energy is used for cooling. .

  Further, according to claim 2 of the present invention, a part or all of the electric power generated by the daytime solar battery is divided into a charged part that is stored in the storage battery and a non-charged part that is not stored in the storage battery. It is a heat supply system using solar power generation characterized in that heat is generated as hot energy by supplying power to a heat generator to generate hot water, and this heat energy is used for hot water supply.

  According to a third aspect of the present invention, in the heat supply system using solar power generation according to the first or second aspect, each of the cold generator and the hot generator includes a refrigeration cycle, and carbon dioxide is used as a working medium. It is used.

  According to a fourth aspect of the present invention, in the heat supply system using solar power generation according to any one of the first to third aspects, the control is divided into a charged amount accumulated in the storage battery and a non-charged amount not accumulated in the storage battery. It has a control function to operate according to the power generation amount of the solar cell.

  According to the heat supply system using solar power generation according to claim 1, instead of charging part or all of the electric power generated by the daytime solar battery to the storage battery, it is divided into a charged part and a non-charged part, Cold storage can be achieved by supplying uncharged power to the daytime cold heat generator and making ice. As a result, cold energy can be generated and cooled using the stored cold energy, and the power supplied to the cold energy generator at the time when the generated power of the solar battery is low due to cloudiness or rain or at night is charged to the storage battery. Since it is not discharged, loss of power energy can be suppressed.

  According to the heat supply system using solar power generation according to claim 2, instead of charging all or part of the electric power generated by the daytime solar battery to the storage battery, it is divided into a charged part and a non-charged part, Heat can be stored by supplying uncharged power to the daytime heat generator to generate hot water. As a result, hot water can be supplied using the stored thermal energy. Conventionally, when the generated power of the solar cell is low due to cloudy or rain, or the power supplied to the thermal generator at night is not charged / discharged to the storage battery, the power energy Loss can be suppressed.

  According to the heat supply system using solar power generation according to the third aspect, the cold heat generator and the hot heat generator each have a refrigeration cycle, and carbon dioxide is used as a working medium. And can be used safely because it is a natural refrigerant, is environmentally friendly, non-toxic and non-flammable.

  According to the heat supply system using solar power generation according to the fourth aspect of the present invention, since it has a function of controlling an operation to be divided into a charge amount stored in the storage battery and a non-charge amount not stored in the storage battery according to the power generation amount of the solar battery. When the amount of power generation is small, power is not stored, and the risk of hindering the use of the heat generator can be prevented.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a heat supply system using solar power generation according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a first embodiment of a heat supply system using solar power generation according to the present invention. FIG. 2 is an explanatory diagram for explaining power distribution by solar power generation.

In FIG. 1, 1 is a well-known solar cell, which is attached to the roof of an independent house such as a mountain hut. In this case, it is assumed that a commercial power source is not drawn into the independent house, and that the solar cell 1 is an independent power system. Reference numeral 2 denotes an exchanger that converts direct-current power generated by the solar cell 1 into alternating current, and a normal DC / AC inverter can be used. Reference numeral 3 denotes a distribution board, and AC power is supplied to the indoor load 4 and the cold heat generator 5 through the distribution board 3.
Reference numeral 6 denotes a storage battery that can charge the DC power generated by the solar battery 1 and discharge it to the converter 2.

  Conventionally, all the electric power generated by the solar battery 1 except for the electric power consumed by the indoor load 4 is charged with respect to the storage battery 6, but in the present embodiment, it is not fully charged. For example, as shown in FIG. 2, when the electric power generated by the solar cell 1 by daytime solar radiation is schematically shown by a solid mountain line and the electric power used is schematically shown by a broken waveform line, the shaded portion used mainly by the daytime indoor load 4 is shown. The electric power excluding the electric power C is divided into a charged part A and a non-charged part B, and only the charged part A is charged in the storage battery 6.

  Charged A and non-charged B may not occur on cloudy or rainy days when the amount of solar radiation is insufficient, and charged A and non-charged B increase on sunny days with a lot of solar radiation. The charged amount A and the non-charged amount B are affected by the weather of the day and do not become a fixed amount. However, when the charge A and the non-charge B are generated by the power generation by the solar battery 1, the charge A is charged to the storage battery 6 as described above. When a shortage occurs in the power used by the indoor load 4 on a cloudy or rainy day, a necessary amount of power is discharged from the storage battery 6 and supplied to the converter 2. Power is backed up by supplying AC power to the indoor load 4 via the panel 3. In addition, the power used by the indoor load 4 in the morning or at night is covered by the discharge from the storage battery 6.

  Of the charge A and the non-charge B, the non-charge B is converted into an alternating current by the exchanger 2 and supplied to the cold heat generator 5 from the distribution board 3. Although not shown, the cold heat generator 5 has a refrigeration cycle, carbon dioxide is used as a working medium, the compressor is operated by power supply, compresses the refrigerant gas to a high pressure, and cools the high-pressure refrigerant gas. The cycle of condensing, condensing the condensed refrigerant liquid to evaporate, and returning the evaporated refrigerant gas to the compressor is repeated. Then, ice is made and stored by exchanging heat with water using the heat of evaporation. As a result, the compressor can be operated during the daytime to store cold energy in the cold generator 5. Cooling can be performed by generating cold air by heat exchange using the cold energy stored.

  Since carbon dioxide is used as the working medium of the refrigeration cycle in the cold heat generating apparatus 5, the transcritical refrigeration cycle apparatus in which the high pressure side can be a supercritical pressure. When carbon dioxide is used as the working medium, the cold storage performance can be improved, and since it is a natural refrigerant, it is environmentally friendly, non-toxic and non-flammable, so it can be used safely.

  Moreover, since the power supply to the cold heat generator 5 is not charged / discharged to the storage battery 6, the capacity of the storage battery 6 can be reduced. As a result, the overall system is not increased in size, and an advantage in terms of facilities can be obtained.

  Next, a second embodiment of the heat supply system using solar power generation according to the present invention will be described. FIG. 3 is a block diagram showing the second embodiment. FIG. 4 is an explanatory diagram for explaining power distribution by solar power generation.

  In FIG. 3, 11 is a known solar cell and is attached to the roof of an independent house such as a mountain hut. In this case, it is assumed that a commercial power source is not drawn into the independent house and the solar cell 11 is an independent power system. Reference numeral 12 denotes an exchanger, which converts DC power generated by the solar battery 11 into AC, and a normal DC / AC inverter can be used. Reference numeral 13 denotes a distribution board, and AC power is supplied to the indoor load 14 and the heat generator 15 through the distribution board 13. Reference numeral 16 denotes a storage battery that can charge DC power generated by the solar battery 11 and discharge the converter 12.

  Conventionally, all of the electric power generated by the solar battery 11 except for the electric power consumed by the indoor load 14 is charged with respect to the storage battery 16, but in the present embodiment, it is not fully charged. For example, as shown in FIG. 4, when the electric power generated by the solar cell 11 by daytime solar radiation is schematically shown by a solid mountain line and the electric power used is schematically shown by a broken waveform line, the shaded portion used mainly by the daytime indoor load 14 is shown. The electric power excluding the electric power C is divided into the charged A and the non-charged B, and only the charged A is charged in the storage battery 16.

  Charged A and non-charged B may not occur on cloudy or rainy days when the amount of solar radiation is insufficient, and charged A and non-charged B increase on sunny days with a lot of solar radiation. The charged amount A and the non-charged amount B are affected by the weather of the day and do not become a fixed amount. However, when the charge A and the non-charge B are generated by the power generation by the solar battery 11, the charge A is charged to the storage battery 6 as described above. When a shortage occurs in the power used by the indoor load 14 on a cloudy or rainy day, a necessary amount of power is discharged from the storage battery 16 and supplied to the converter 12, and the power distribution from the converter 12 is performed. The indoor load 14 is supplied with AC power via the panel 13 for backup. Further, the electric power used by the indoor load 14 in the morning or at night is covered by the discharge from the storage battery 16.

  Of the charge amount A and the non-charge amount B, the non-charge amount B is converted into an alternating current by the exchanger 12 and supplied to the heat generating device 15 from the distribution board 13. Although not shown in the figure, the heat generator 15 has a refrigeration cycle, and carbon dioxide is used as a working medium. The compressor is operated by power supply to compress the refrigerant gas to a high pressure, and the high-pressure refrigerant gas is cooled. The cycle of condensing, condensing the condensed refrigerant liquid to evaporate, and returning the evaporated refrigerant gas to the compressor is repeated. And hot water is produced | generated by making it heat-exchange with water using condensing heat, and it stores in the hot water supply tank which is not shown in figure. Thereby, the compressor can be operated during the daytime to store the thermal energy in the thermal generator 5. Hot water can be supplied from the hot water supply tank using the stored thermal energy.

  Since carbon dioxide is used as the working medium for the refrigeration cycle in the heat generator 15, the transcritical refrigeration cycle apparatus can be supercritical on the high pressure side. When carbon dioxide is used as the working medium, the heat storage performance can be improved, and since it is a natural refrigerant, it is environmentally friendly, non-toxic and non-flammable, so it can be used safely.

  Further, since the power supply to the heat generator 15 is not charged or discharged to the storage battery 16, the capacity of the storage battery 16 can be reduced. As a result, the overall system is not increased in size, and an advantage in terms of facilities can be obtained.

  The present invention has a control function that operates according to the amount of power generated by the solar cell, for example, in the morning when the amount of power generated is small. Etc. can be stored so that the use of the heat generator is not hindered.

  In the first embodiment and the second embodiment, the control device (not shown) is used to control the power distribution of solar power generation, charging / discharging the storage battery, and the power supply to the cold / hot generator. Configure.

  The present invention can be effectively used as a heat supply system using solar power generation particularly in an independent power supply system such as a mountain hut.

1 is a block diagram showing a first embodiment of a heat supply system using solar power generation according to the present invention. In 1st Embodiment, it is explanatory drawing for demonstrating the electric power distribution by solar power generation. It is a block diagram which shows 2nd Embodiment of the heat supply system using photovoltaic power generation which concerns on this invention. In 2nd Embodiment, it is explanatory drawing for demonstrating the electric power distribution by solar power generation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell 2 Exchanger 3 Distribution board 4 Indoor load 5 Cold heat generator 6 Storage battery 11 Solar cell 12 Exchanger 13 Distribution board 14 Indoor load 15 Thermal generator 16 Storage battery

Claims (4)

  Dividing the electric power generated by the daytime solar battery into part of or all of the power stored in the storage battery and non-charged power not stored in the storage battery. The solar power generation heat supply system is characterized in that the cold energy is stored as refrigeration energy and is used for cooling.   Divided into a storage battery that stores part or all of the power generated by the daytime solar battery in a storage battery and a non-charged battery that cannot be stored in the storage battery. A heat supply system using photovoltaic power generation, characterized in that the thermal energy is stored as thermal energy and is used for hot water supply.   The heat supply system using solar power generation according to claim 1 or 2, wherein the cold heat generator and the hot heat generator are each provided with a refrigeration cycle, and carbon dioxide is used as a working medium.   The control function of operating the control to divide the charged amount stored in the storage battery into the non-charged amount not stored in the storage battery according to the amount of power generated by the solar cell. A heat supply system using solar power generation as described in Crab.

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