KR102045803B1 - Low-temperature dryer utilizing solar energy and geothermal energy - Google Patents

Abstract

Double layer glass with built-in solar cell is installed on the roof of the dryer, under the outside air is circulated, and underground heat exchanger device employing heat exchanger pipe embedded in the ground By introducing the heated hot air into the lower part of the dryer and circulating, a low-temperature dryer using economical and environmentally friendly solar heat and geothermal heat is possible, which enables high efficiency drying of crops. A horizontal auger 20 is disposed inside the low temperature dryer, and a plurality of wings 22 spirally move on the radial axis of the rotary auger 20 of the horizontal auger 20 in contact with the agricultural products to transfer the agricultural products in the transverse direction. Is formed to protrude, the horizontal auger 20 is rotated by a drive motor 24, the solar cell generator 100 is installed on the roof of the low temperature dryer, a plurality of solar cells 130 is built A glass plate 114 is installed on an upper surface of the battery module 110, and a first air flow path P1 for warming by solar heat while circulating outside air is defined between the inner upper surface of the main body and the upper guide plate 16. The second air passage P2 for circulating the air heated by the geothermal heat is defined between the inner lower surface of the main body and the lower guide plate 18, and the air heated by the geothermal heat is transferred to the second air passage P2. Underground heat to provide toward The ventilation device 200 is provided with a heat exchange pipe 210 is made of a long pipe in a zigzag form so as to obtain the heat of the ground effectively.

Description

Low-temperature dryer utilizing solar energy and geothermal energy}

The present invention relates to a low-temperature dryer using solar and geothermal heat, and more particularly, to install a double-glazed glass with a solar cell on the roof of the dryer, and to circulate by introducing outside air under the same heat exchange pipe buried in the ground By adopting the underground heat exchanger device, the hot air warmed by using natural heat of 10 ~ 35 ℃ is introduced into the lower part of the dryer and circulated, so that high efficiency drying of crops is possible, and it is economical and eco-friendly low temperature dryer using geothermal and geothermal heat. It is about.

Drying using solar heat is actively reviewed for its application to mass drying treatment of grain, food, wood, and agricultural products at relatively low temperatures due to its enormous environment and no environmental destruction, and its excellent characteristics that are environmentally friendly and require no energy cost. It is becoming.

In the case of using solar heat as a dry heat source, the direct heating method in which solar energy is directly applied to a dry object and dried, indirect heating method in which drying is performed by hot air obtained by heating air with solar energy using a collector, or solar energy By heating the working fluid can be divided into a method of heating the air through the heat exchange with the working fluid.

Republic of Korea Utility Model Publication No. 20-0442749 (Registration Date: December 01, 2008) discloses a stirring drying agricultural low temperature drying device. This low temperature drying device is configured to interlock and interlock with a plurality of stirring screws in the drying device along the vertical direction and adopt a hot water pipe and a heating coil, and to produce agricultural products such as water peppers into the dryer at low temperature in natural conditions. The structure is dried in the sun. By the way, the low temperature drying device has a problem in that the installation of the mechanical structure installed therein is complicated, energy consumption is high, and only the solar energy is used for drying the agricultural products.

In the related industry, efforts are being made to make up for the shortcomings in terms of commercialization of solar energy. One of them is the technology using geothermal energy that is attracting attention as renewable energy along with solar energy. Geothermal energy is the energy that can be cooled in summer and heated in winter by using the temperature difference between the atmosphere and the ground, and is utilized in various ways according to the temperature of the ground. It is the most efficient, environmentally friendly, and cost effective energy among the existing heating and cooling technologies. It can be said.

Republic of Korea Patent Publication No. 10-1209092 (Registration Date: November 30, 2012) discloses a heating system of a non-powered vinyl house using solar heat and geothermal heat, which is a geothermal heat storage in the basement of the vinyl tube heat storage tank A tank is installed, and a solar heat collecting pipe is installed on the ceiling, and the heated air introduced into the solar heat collecting pipe is introduced into the geothermal heat storage tank through a dehumidifying dryer connected to the pipe, and the water wall heating pipe, the heat inlet pipe, the inner tube pipe, and the outside are installed. After passing through the tube tube and the heat discharge tube, it is circulated inside the vinyl house to heat the vinyl house.

Korean Patent Laid-Open Publication No. 10-2015-0015105 (published: February 23, 2015) discloses a heat exchange system using solar heat and geothermal heat, and this system installs a fin type heat dissipation cooling pipe on a solar power panel. It is a structure that circulates cooling water through a heat pump and an underground heat exchanger.

Korean Patent Publication No. 10-1801480 (Registration Date: November 20, 2017) discloses a heating system for an agricultural house using solar heat and geothermal heat, which uses water and heat to heat the water in the heat exchange tank. The heated, warmed water warms the refrigerant passing through the evaporation coil of the heat pump, and the warmed refrigerant heats the heating water stored in the hot water tank to heat the agricultural house.

However, the above-described patents focus on heating the plastic house using solar heat and geothermal heat, and there are technical limitations to utilize them for drying agricultural products.

Korean Utility Model Registration Publication No. 20-0442749 (Registration Date: December 01, 2008)

The technical problem to be solved by the present invention is to heat the outside air using solar heat and at the same time to heat the outside air using geothermal heat and introduce the heated air into the body of the dryer to dry the agricultural products at low temperature, economical efficiency that can be dried To provide a low-temperature dryer that uses solar and geothermal heat, which is environmentally friendly and environmentally friendly.

In order to solve the above technical problem, the present invention is a low temperature dryer using solar heat and geothermal heat,

It is supported on the ground and defines a space for accommodating agricultural products therein, one side upper portion is provided with a first air inlet for introducing outside air and a first intake fan is separately installed on the front outside of the first air inlet A second heated air inlet is installed at the lower side of the side, and a second intake fan is separately installed at the front outside of the second heated air inlet. In the space, a horizontal auger is disposed horizontally along the longitudinal direction of the main body. On the radial outer surface of the rotating auger of the horizontal auger, a plurality of wings are formed to protrude in a spiral shape in contact with the agricultural product in a transverse direction, and the horizontal auger is driven at one end of the rotating shaft from the outside of the main body. Rotationally driven by a motor;

A photovoltaic device for converting solar energy into electrical energy installed on an upper surface of the main body-the photovoltaic device includes a solar cell module in which a plurality of solar cells are built, and on the upper surface of the solar cell module A glass plate is installed, and a spacer is disposed between the solar cell module and the glass plate;

Underground heat exchanger device for providing geothermally heated air toward the second heated air inlet-The underground heat exchanger device uses a heat exchanger pipe made of a long zigzag long tube to cool the ground heat effectively. Comprising a compressor, a condenser, a pressure reducer, and an evaporator to perform four processes of compression, condensation, expansion, and evaporation at a high temperature in the condenser, wherein the condenser is disposed in the heat exchanger body. Provides a low temperature dryer using and geothermal heat.

An upper guide plate is disposed horizontally along the longitudinal direction of the main body at an upper side of the main body, and a first air flow path is defined by an inner upper surface of the main body and the upper guide plate, and one side of the first air flow path. Is in communication with the first air inlet, and the first guide air inlet is formed in the upper guide plate on the other side of the first air passage, and the first air passage is formed by the first heated air inlet. It is characterized by being in communication with.

A lower guide plate is disposed horizontally along the longitudinal direction of the main body at a position below the horizontal auger within the main body, and a second air flow path is defined between the lower guide plate and the inner lower surface of the main body. One side of the second air passage communicates with the second heated air inlet, and a third heated air inlet is formed in the lower guide plate on the other side of the second air passage, and the third heated air inlet is The second air flow passage is in communication with the space.

In the upper portion of the main body, a hopper for injecting agricultural products to be dried into the main body is mounted in a region other than the glass plate, and the lower portion of the hopper communicates with the inside of the main body, and the lower portion of the hopper and the Between the upper portion of the body is characterized in that the hopper automatic opening and closing device is installed.

On the other side of the main body is provided with an agricultural product outlet for discharging the agricultural products dried in the space to the outside of the position where the second warm air inlet is installed, the agricultural product outlet and the side wall of the main body Characterized in that the outlet opening and closing device for mechanically opening and closing the outlet as needed.

One of the side walls of the main body is provided with an air outlet for circulating the space of the main body to dry the agricultural products and then discharge the air having a relatively low temperature to the outside of the main body, the second formed in the lower portion of the heat exchanger main body The first air line in the form of a pipe is disposed between the air inlet and the air outlet.

A heated air outlet is formed at an upper portion of the heat exchanger main body, and a second air line having a pipe shape is extended between the heated air outlet and the second heated air inlet.

Electrical energy generated by the operation of the photovoltaic device is characterized in that it can be provided to the drive motor, the compressor, the condenser and the evaporator as power.

The solar cell module may be replaced with a transparent solar panel (TLSC).

As mentioned above, according to the present invention, an underground heat exchanger apparatus employing a heat exchanger pipe embedded in the ground while installing a multilayer glass having a solar cell installed on the roof of a dryer and introducing and circulating outside air thereunder. By introducing the hot air warmed by using the geothermal heat of 10 ~ 35 ℃ to the inside lower part of the dryer, it is possible to efficiently dry the crops and economical. In addition, it is eco-friendly because it can be installed and operated in harmony with the surrounding environment.

1 is a view schematically showing the overall configuration of a low temperature dryer using solar and geothermal heat according to an embodiment of the present invention.

The drawings in the present application and their accompanying detailed description are directed to merely exemplary embodiments of the invention. Advantages and other features of the mechanisms and methods disclosed herein will become more apparent to those skilled in the art through a detailed description with reference to the accompanying drawings, which illustrate representative embodiments of the present invention.

Hereinafter, a low temperature dryer using solar heat and geothermal heat according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 schematically shows the overall structure of a low temperature dryer using solar and geothermal heat.

Referring to FIG. 1, a low temperature dryer using solar and geothermal heat includes a main body 10 having a lower portion supported on a ground by a plurality of pedestals 11 and defining a space S defined to receive agricultural products therein. It is provided. Inside the main body 10, a temperature sensor (not shown) and a humidity sensor (not shown) are installed.

On the upper surface of the main body 10 is disposed a solar cell module 110 of the photovoltaic device 100 for converting solar energy into electrical energy. The solar cell module 110 includes a plurality of solar cells 130, and a glass plate 114 is installed on an upper surface of the solar cell module 110. A spacer (not shown) is disposed between the solar cell module 110 and the glass plate 114.

Alternatively, the solar cell module 110 configured as described above may be replaced with a recently developed transparent solar panel (TLSC). Transparent solar panels selectively absorb only ultraviolet and near infrared wavelengths, which are invisible light, using organic molecules to convert light into electrical energy while maintaining a transparent state. The efficiency of the transparent solar panel is inferior to that of the existing solar panel, but it can be said to be sufficiently replaceable in view of the development speed of related technologies.

Light energy generated by the solar cell module 110 is provided to the consumer side via the charge controller 120, the battery 130, the inverter 140 and the main circuit breaker panel 160 of the photovoltaic device 100, wherein The inverter 140 may be electrically connected to the generator 150, and may also transmit energy generated from the generator 150 to the battery 130 as needed.

On the other hand, in the upper part of the main body 10, the hopper 12 for injecting the agricultural products to be dried into the main body 10 is mounted in a region other than the glass plate 114 is installed, the lower portion of the hopper 12 It communicates with the inside of (10). The hopper automatic opening and closing device 12a is installed between the lower part of the hopper 12 and the upper part of the main body 10.

A first air inlet 14 for introducing outside air is installed at an upper portion of one side of the main body 10, and a first intake fan 13 is separately installed at a front outer side of the first air inlet 14. The upper guide plate 16 is disposed horizontally along the longitudinal direction of the main body 10 on the inner upper side of the main body 10. The first air flow path P1 is defined by the inner upper surface of the main body 10 and the upper guide plate 16. One side of the first air passage P1 communicates with the first air inlet 14, and a first heated air inlet 15 is formed in the upper guide plate 16 at the other side of the first air passage P1. . The first air passage P1 communicates with the space S by the first heated air inlet 15. The outside air introduced through the first air inlet 14 is warmed by sunlight that passes through the glass plate 114 installed on the upper surface of the main body 10 while passing through the first air flow path P1. The heated air inlet 15 is for introducing the warmed air into the space S.

In the space S defined by the main body 10, a horizontal auger 20 is disposed horizontally along the longitudinal direction of the main body 10. On the radial outer surface of the rotating shaft 21 of the horizontal auger 20 a plurality of wings 22 for projecting the agricultural products in transverse direction in contact with the agricultural products are formed to protrude in a spiral. The horizontal auger 20 is rotationally driven by a drive motor 24 mounted to one end of the rotation shaft 21 from the outside of the main body 10.

The lower guide plate 18 is disposed horizontally along the longitudinal direction of the main body 10 at a position below the horizontal auger 20 within the main body 10. The second air flow path P2 is defined between the lower guide plate 18 and the inner lower surface of the main body 10 by the lower guide plate 18.

On the other side of the main body 10 corresponding to one side of the second air flow path P2, a second heated air inlet 34 for introducing air heated by geothermal heat by the underground heat exchanger device 200, which will be described below. ) Is installed. A second intake fan 33 is separately provided at the front outer side of the second warm air inlet 34. One side of the second air flow path P2 communicates with the second heated air inlet 34, and the third heated air inlet 35 is formed in the lower guide plate 18 on the other side of the second air flow path P2. Is formed. The second air flow path P2 communicates with the space S by the third warm air inlet 35. The warm air introduced through the second warm air inlet 34 is introduced into the space S through the third air inlet 35 after passing through the second air flow path P2.

On the other side of the main body 10, the agricultural product outlet 40 for discharging the agricultural products dried in the space (S) to the outside above the position where the second warm air inlet 34 is installed. Between the agricultural product outlet 40 and the side wall of the main body 10, the outlet opening and closing device 42 for mechanically opening and closing the agricultural product outlet 40 is provided.

One of the side walls of the main body 10 is provided with an air outlet 17 for discharging air having a relatively low temperature to the outside of the main body 10 after drying the agricultural products while circulating the space S of the main body. The air outlet 17 is in fluid communication with a second air inlet 264 formed under the heat exchanger body 260 of the underground heat exchanger device 200, which will be described below. To this end, a pipe-shaped first air line A1 is extended between the air outlet 17 and the second air inlet 264.

As described above, the underground heat exchanger apparatus 200 for providing the air heated by the geothermal heat toward the second warm air inlet 34 is to use the geothermal heat as it is. Geothermal energy is the energy that soil, groundwater, and surface water are held by solar radiation or magma heat inside the earth, and generally rises 2.5 ℃ per 100 meters of depth and maintains a constant temperature throughout the year. In addition, water temperature is used in areas with abundant groundwater, and pure geothermal heat retained by soil and rocks is used in areas where the amount of groundwater is poor or limited. Geothermal heat is divided into a natural geothermal heat and a deep geothermal heat according to the depth using the heat energy, in the present invention was configured to utilize the heat pump system using a shallow geothermal heat of 10 ~ 35 ℃ within a depth of 300m to be used for drying the agricultural products. The heat pump system uses stable geothermal heat to enable high efficiency drying and low maintenance and maintenance costs. Unlike other renewable energy generation, geothermal energy can be operated 24 hours a year without depending on the external climate, and there is no difficulty in harmonizing with buildings and high potential for high economic feasibility.

The underground heat exchanger device 200 performs four processes of compression-condensation-expansion-evaporation to transfer heat from low temperature to high temperature together with a heat exchange pipe 210 made of a long zigzag-shaped tube to effectively obtain the heat of the ground. Compressor 220 to be performed, the condenser 230, the pressure reducing valve 240 and the evaporator 250 is an expansion valve.

The working fluid heated by geothermal heat while circulating inside the heat exchange pipe 210 is compressed by the compressor 220 via the evaporator 250 and supplied to the condenser 230. The body 10 of the low temperature dryer is provided. The air discharged from the air outlet 17 formed on the side wall of the air is introduced into the heat exchanger body 260 to circulate around the condenser 230 to exchange heat with the working fluid. The warmed air is discharged to the outside through the heated air outlet 266 formed on the heat exchanger body 260. At this time, the heated air outlet 266 is fluidly connected to the second heated air inlet 34 described above via a separate second air line A2 in the form of a pipe. Accordingly, the warmed air is discharged through the heated air outlet 266 and introduced into the second air flow path P2 through the second heated air inlet 34.

The working fluid which heat-exchanged with air in the heat exchanger body 260 while circulating inside the condenser 230 flows toward the evaporator 250 via the pressure reducer 250 and then opens the heat exchange pipe 210 embedded in the ground. As it passes by, it absorbs geothermal heat from nearby soil.

The following briefly describes the operation of the low temperature dryer using the solar and geothermal heat configured as described above.

First, agricultural products to be dried are introduced into the internal space S of the main body 10 through the hopper 12 provided on the upper part of the low temperature dryer main body 10, in which case the hopper automatically installed at the lower part of the hopper 12 By operating the switchgear 12a, the degree of opening and closing of the hopper 12 is controlled as necessary.

When the agricultural product is introduced into the space S, the driving motor 24 is operated to rotate the horizontal auger 20. The injected agricultural product is agitated by the blade 22 of the horizontal auger 20, and the horizontal auger 20 is rotated. Is moved in the transverse direction along the direction of rotation.

At the same time, as described above, the solar power generator 100 and the underground heat exchanger apparatus 200 are operated to provide solar energy and geothermal energy to the main body 10. The electric energy generated by the operation of the solar cell apparatus 100 may be driven by components that require external power, such as the drive motor 24, the compressor 220, the condenser 230, the evaporator 250, and the like. Can be provided.

Operating the first intake fan 13 while operating the photovoltaic device 100 to introduce external air through the first air inlet 14 formed on one side of the main body 10 to form an inner upper surface of the main body 10. And the air is circulated through the first air flow path P1 defined by the upper guide plate 16.

At this time, the air is heated by sunlight falling down through the glass plate 114 installed on the upper surface of the main body 10, the warmed air through the first heated air inlet 15 to the inside of the main body 10 It is introduced into the space S.

Operate the second intake fan 33 while operating the underground heat exchanger device 200 to operate the underground heat exchanger device 200 through the second heated air inlet 34 formed in the lower side of the other side of the main body 10. The air heated by geothermal heat is circulated through the second air flow path P2 defined by the inner lower surface of the main body 10 and the lower guide plate 18. Air circulating through the second air flow path P2 is introduced into the space S inside the main body 10 through the third warm air inlet 35.

Air heated by solar heat and geothermal heat is introduced into the space S inside the main body 10 to dry the agricultural products at low temperature, and the air having a relatively low temperature through heat exchange with the agricultural products is the air outlet 17 and the first air. It is provided to the inside of the heat exchanger main body 260 through the second air inlet 264 of the underground heat exchanger device 200 through the air line A1 and is warmed again, and the heated air outlet 266 and the second air line A2. ) Is introduced into the space S inside the main body 10 through the second warm air inlet 34 again.

The low temperature dryer according to the present invention is configured to maintain a desired temperature and humidity preset based on a temperature and humidity detected by a temperature sensor (not shown) and a humidity sensor (not shown) installed in the main body 10. The operation of the solar cell apparatus 100, the geothermal power generator 200, and the intake fans 13 and 33 is controlled.

The agricultural products dried by this operation of the low temperature dryer are discharged to the outside through the agricultural product outlet 40 formed on the other side lower portion of the main body 10. At this time, by controlling the opening and closing degree of the agricultural product outlet 40 through the discharge opening and closing device 42 installed in the agricultural product outlet 40 is discharged to the outside when the agricultural product is dried in a desired state, the body 10 as needed Some of the warm air may be exhausted to the outside.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art may understand that various modifications and changes can be made without departing from the essential characteristics of the present invention. There will be. Therefore, the embodiments represented in the present invention are not intended to limit the technical spirit of the present invention, but to describe, and the scope of the present invention is not limited to these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas that are equivalent to or equivalent to the equivalent scope should be construed as being included in the scope of the present invention.

10 body 12: hopper
13,33: intake fan 14,264: air inlet
15, 34, 35: heated air inlet 17: air outlet
16,18: guide plate 20: horizontal auger
24: drive motor 40: agricultural product outlet
100: solar power generator 110: solar cell module
114: glass plate 200: underground heat exchanger device
210: heat exchange pipe 220: compressor
230: condenser 240: pressure reducer
250: evaporator 260: heat exchanger body
266: heated air outlet A1, A2: air line
P1, P2: Air flow path S: Space

Claims (9)

As a low temperature dryer using solar heat and geothermal heat,
Supported on the ground (G) and defines a space (S) for accommodating agricultural products therein, a first air inlet 14 for introducing outside air is provided on one side upper portion and the first air inlet 14 The first intake fan 13 is separately installed on the front outer side of the second side, and the second heated air inlet 34 is installed at the lower side of the other side, and the second intake fan 33 is located at the front outside of the second heated air inlet 34. The separately installed main body 10-in the space (S) horizontal auger 20 is disposed horizontally along the longitudinal direction of the main body 10, the radial axis of rotation 21 of the horizontal auger 20 On the outer surface is formed a plurality of wings 22 to protrude in a spiral in contact with the agricultural products in the transverse direction, the horizontal auger 20 of the rotary shaft 21 from the outside of the main body 10 Rotationally driven by a drive motor 24 mounted at one end;
Installed on the upper surface of the main body 10, the photovoltaic device 100 for converting solar energy into electrical energy-the photovoltaic device 100 is a solar cell module with a plurality of solar cells 130 built-in (110), a glass plate (114) is installed on an upper surface of the solar cell module (110), and a spacer is disposed between the solar cell module (110) and the glass plate (114);
Underground heat exchanger device 200 for providing air heated by geothermal heat toward the second warm air inlet 34-The underground heat exchanger device 200 is provided in a long zigzag shape to efficiently obtain the heat of the ground. Compressor 220, condenser 230, pressure reducer 240 and evaporator to perform four processes of compression, condensation, expansion and evaporation to transfer heat from low to high temperature together with a heat exchange pipe 210 made of a pipe And (250), wherein the condenser (230) is disposed within the heat exchanger body (260);
Electrical energy generated by the operation of the solar cell apparatus 100 is supplied to the drive motor 24, the compressor 220, the condenser 230 and the evaporator 250 by power,
Low temperature dryer using solar and geothermal heat, characterized in that. According to claim 1, wherein the upper guide plate 16 is disposed horizontally along the longitudinal direction of the main body 10 in the upper upper side of the main body 10, the inner upper surface of the main body 10 and the upper portion The first air flow path P1 is defined by the guide plate 16, one side of the first air flow path P1 communicates with the first air inlet 14, and On the other side, a first heated air inlet 15 is formed in the upper guide plate 16, and the first air flow path P1 is formed in the space S by the first heated air inlet 15. Low temperature dryer using solar and geothermal heat characterized in that the communication. The lower guide plate 18 is disposed horizontally along the longitudinal direction of the main body 10 at a position below the horizontal auger 20 in the main body 10. A second air flow path P2 is defined between the plate 18 and the inner lower surface of the main body 10, and one side of the second air flow path P2 communicates with the second warm air inlet 34. On the other side of the second air flow path (P2), the lower guide plate 18 is formed with a third heating air inlet 35, the second heating air inlet 35 by the second Air passage (P2) is a low temperature dryer using solar and geothermal heat, characterized in that in communication with the space (S). According to claim 1, wherein the hopper 12 for introducing the agricultural products to be dried into the main body 10 in the region other than the glass plate 114 is installed on the upper portion of the main body 10, The lower part of the hopper 12 communicates with the inside of the main body 10, and between the lower part of the hopper 12 and the upper part of the main body 10, a solar hopper, characterized in that the automatic opening and closing device (12a) is installed Low temperature dryer using geothermal. According to claim 1, Agricultural product outlet for discharging the agricultural products dried in the space (S) to the top of the position where the second heating air inlet 34 is installed on the other side of the main body ( 40 is installed, the outlet opening and closing device 42 for mechanically opening and closing the agricultural product outlet 40 is provided between the agricultural product outlet 40 and the side wall of the main body 10 as needed. Low temperature dryer using solar and geothermal heat. According to claim 1, One of the side walls of the main body 10 for drying the agricultural products while circulating the space (S) of the main body and the air for discharging the air having a relatively low temperature to the outside of the main body 10 The outlet 17 is formed, and the first air line A1 in the form of a pipe extends between the second air inlet 264 formed in the lower part of the heat exchanger body 260 and the air outlet 17. Low temperature dryer using solar heat and geothermal heat characterized by. The method of claim 6, wherein the heated air outlet 266 is formed on the upper portion of the heat exchanger body 260, and the pipe-shaped agent is formed between the heated air outlet 266 and the second heated air inlet (34). 2 A low temperature dryer using solar heat and geothermal heat, characterized in that the air line (A2) is extended. delete The low temperature dryer using solar and geothermal heat according to claim 1, wherein the solar cell module (110) can be replaced with a transparent solar panel (TLSC).

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