KR200362988Y1 - The air-conditioning and heating system used geothermal - Google Patents

Abstract

The present invention relates to a regenerative air-conditioning and heating device for horticulture using geothermal heat, which is a pollution-free ceiling energy source.

More specifically, the heat and ground heat generated by the solar soil is collected using a heat pump apparatus, transported through an evaporator, compressed, and heated to a usable temperature, and collected in a heat storage tank through a condenser. To heat the inside of the greenhouse,

On the contrary, the heat dissipation of condensation heat to the soil, the temperature is lowered, transported through an evaporator, collected in a heat storage tank, and a two-way heat pump device for cooling the inside of the greenhouse using a blower.

Description

Air-conditioning and heating system used geothermal

The present invention is to heat and heat with only 100% geothermal heat, so that horticulture is possible. The heat generated from the soil is heated by a two-way geothermal source pump, heating up the house in winter and lowering the temperature in summer. The present invention relates to a horticulture air-conditioning and heating device for cooling for cultivation.

In general, when cultivating crops in a horticultural house, the environment in the soil such as temperature, sunlight, carbon dioxide, and the like, as well as the moisture, nutrients, oxygen and proper temperature in the soil are important. Therefore, a number of equipments such as a hot air fan, a carbon dioxide generator, and an irrigation facility have been developed and used to create an optimal environment for plant crops to grow well. However, fossil fuels are mainly used as fuels, and the total amount depends on imports. As a result, the burden on farms due to the price fluctuation of crude oil is considerable, but there is insufficient development of a method for saving fuel or alternative energy.

Actually, as of 2002, 95% of the heating fuel of domestic horticulture is used as diesel, heavy oil is used by 4% and other 1%, and heating costs account for 30 ~ 37% of facility crop management costs. Silver is 20%, Netherlands is 14-15%, and Israel is 10%.

According to statistics from the Rural Development Administration in 2001, most glass greenhouses and vinyl houses in Korea mostly use the heat generated by the heating oil, and the heat of combustion of the heating oil is different from the actual heat of heat. When considering the loss and other heat loss, the heat energy that can be supplied is about 75 ~ 85%, and the heat quantity of diesel oil is about 8,700㎉ / ℓ, which is inefficient because the actual heat is only 7,360㎉ / ℓ.

In addition, there is an unreasonable use of fossil fuels for growing non-polluting agricultural products, as the concern for the health of modern people is increasing and the criteria for selecting agricultural products are becoming more stringent. Pollution-free natural alternative energy is essential, but there are no special alternatives yet, and the reality is that it uses solar, wind power, and geothermal heat as an auxiliary heat source.

Therefore, the development of a method that can be used as a primary heat source 100% as an alternative energy source, instead of using the solar energy, wind power, geothermal energy, and the like, as non-polluting ceiling energy, is urgently required.

In this invention, in order to solve the above problems in building a facility horticulture air-conditioning system using solar heat and geothermal heat as a heat source, the underground heat exchanger 10, the heat pump device 20 and the heat storage tank 30 is an important device Determine the thermal characteristics by analyzing ground temperature changes; Embedding the underground heat exchanger (10) in a suitable location; Efficiently recovering geothermal heat and solar heat storage with the underground heat exchanger; Draw heat from the ground using the heat pump apparatus 20; Heat is stored in the heat storage tank 30; It is created with the technical problem to heat and cool with the blower (40).

1 is a view schematically showing the principle of the heating and cooling device according to the present invention

2 is a graph showing the temperature change according to the change in the depth of the soil

3 is a graph showing the soil temperature at night by the experiment of the present invention

4 is a graph showing the soil temperature during the day by the experiment of the present invention

■ Explanation of the major symbols used in the main parts of the drawings ■

10: underground heat exchanger 20: heat pump device

21: Evaporator 22: Four-way valve

23 expansion valve 24 compressor

25: condenser 30: heat storage tank

40: blower 50: measuring device

60: piping

1 is a view schematically showing the principle of the heating and cooling device according to the present invention, Figure 2 is a graph showing the temperature change according to the change in the depth of the soil, Figure 3 is a graph showing the soil temperature at night by the experiment of the present invention And, Figure 4 is a graph showing the soil temperature of the day by the experiment of the present invention, the present invention will be described in detail as follows.

First, geothermal heat is described, geothermal refers to the thermal energy of the earth's soil, rocks, and the like. The characteristics of geothermal energy sources are distributed in the ground, there is little change in the state of energy resources throughout the year, and they exist everywhere in Korea and there is no big difference in the distribution. Geothermal heat can be changed for a certain period of time depending on the use, but no matter how much it is used, there is no risk of permanent depletion. In addition, geothermal heat is getting hotter toward the center of the earth, when there reaches a certain depth into the underground there is a passivation layer with little change in year-round temperature (Fig. 2). In summer, since geothermal is lower than atmospheric temperature, it can be used as a cooling energy source, and in winter, it can be used as heating energy source because it is higher than atmospheric temperature.

Geothermal energy is clean energy, and its quantity is huge, and it is very suitable as natural alternative energy because it contains infinitely low density energy as a stable and continuous heat source.

Looking at the facility horticulture air-conditioning device using the geothermal heat according to Figure 1,

1. Underground heat exchanger 10 that performs heat transfer with geothermal heat is buried at a depth of about 1m from the surface, the ground heat exchanger 10 is the heat storage and geothermal heat for the soil of the sun based on the thermal properties of the ground At the same time effectively recover.

2. Heat is transferred from the ground through the heat pump device 20 to raise the temperature of the heat medium to an acceptable level. The heat pump device 20 is configured as an evaporator 21, a four-way valve 22, an expansion valve 23, a compressor 24, and a condenser 25.

In the case of heating, the geothermal heat is collected through the evaporator 21, transported and then compressed to condense in the condenser 25 by raising the temperature of the heat medium to an acceptable level. At this time, by attaching the measuring device 50 on the evaporator side to measure the evaporator inlet and underground temperature.

In the case of cooling, on the contrary, the heat of the condenser 25 is radiated to the soil to lower the temperature of the heat medium to the extent possible to be collected in the evaporator 21 via the compressor 24.

3. The geothermal energy passing through the heat pump device 20 is collected in the heat storage tank 30 through the pipe 60 in the condenser 25 or the evaporator 21.

4. When the geothermal energy collected in the heat storage tank 30 reaches the house via the pipe 60, it is cooled and heated through the blower 40.

The ground heat exchanger 10 in the above 1 is usually more than 50 ~ 60 cm deep from the ground surface there is no fluctuation of the geothermal, it is most suitable to be buried in about 1m or more at 50 cm or more.

In general, the ground heat exchanger (10) should be buried much deeper because the surface of the soil exposed to the winter is colder than the inside, but in the case of facility horticulture, the temperature of the soil surface is higher than the inside of the soil due to the radiant heat that is accumulated by the sun. Since the heat accumulation of the soil surface is high and transferred to the inside, it is preferable to bury it to a depth of about 1m as described above in order to make full use of the surface. Too thin a landfill, on the other hand, can attract heat and lower the soil temperature, which can affect crop growth. Landfill type has the advantages of suitable closed horizontal type, low installation cost, low maintenance cost, and efficient environmental pollution.

The heat pump device 20 was previously used only for heating, but in the present invention, it is also used for cooling and heat transfer is possible, and the heating capacity is 65㎾ or more, which operates at a constant cycle, not continuous operation. It stops when the inlet temperature of the water drops below a certain temperature, and then operates when the temperature reaches a certain temperature again. In addition, in order to analyze the cycle of the heat pump device 20, a coolant flow meter is installed, and a measuring device 50 such as a temperature sensor and a pressure sensor is attached to each of the heat exchanger inlet and outlet and the compressor inlet and outlet.

The heat storage tank 30 serves as a thermal buffer with the geothermal source heat pump 20, and the fruit of the heat storage tank 30 uses water, but the temperature and the falling width of the water can be appropriately set.

The following is an example of the actual experiment using the crop as a cucumber in a plastic house as an embodiment of the present invention, and after automatically operating the heat pump apparatus 20 for about 25 days, the result data is acquired for 20 days and the data is analyzed. It is.

The room temperature was set to 15 ± 1 ℃. After sunrise, the room temperature increased sharply (more than 20 ℃) due to the large amount of solar radiation. However, the room temperature was relatively constant without the influence of outside temperature. Periodic heating was performed to maintain the temperature setting. The heating time was once 1 ~ 2 minutes, the heating time was stopped and the time until the next heating time was about 20 minutes at the beginning. . At this time, even when heating, when the heat pump 20 is operated, the temperature of the heat storage tank 30 is increased because the amount of heat generated is greater than the heating load. When the heating period is not heating temperature gradient of the heat storage tank (30) was larger than the falling gradient when the heating period, which means that the heat storage rate is faster than the heat consumed throughout the day, and enough heat to be consumed Shows that you can.

The initial temperature of heating is large, which means that the time from heating termination to reheating is relatively long, because the heat from the heat storage tank is small and the temperature of the heat storage tank is restored even with a short operating time of the heat pump for small heat consumption. The temperature difference between the geothermal water inlet and outlet through the evaporator 21 was maintained at about 2.2 ° C on average, and the flow rate of the refrigerant was also kept relatively constant.

The temperature of the soil that needs to be taken into account during the heat with the underground heat exchanger (10). The surface temperature of the soil is affected by insolation, so the temperature change is great even during the day. As shown in Figure 3, the temperature gradient according to the depth of the soil inside and outside the greenhouse can be seen to exhibit the opposite tendency except for the temperature of the outer surface. Since the outside temperature in winter is lower than the temperature in the soil, the temperature gradient for the depth has a positive value, and the temperature gradient for the depth has a negative value because the temperature in the greenhouse is higher than the soil temperature.

Figure 4 shows the temperature distribution of the soil at the time since sunrise with the largest amount of insolation 12 hours before FIG. Except for the outside air temperature, the depth of change of temperature change for 12 hours is 0.2m, and the effect of 12 hours is very small at the depth afterwards, and the surface temperature of existing heating oil used and test greenhouse is up to 0.3m. Similarly, it can be seen that there is little effect of underground heat exchanger within 0.3m of the surface.

According to the above experiment, it was possible to efficiently maintain the temperature without any problem for the cucumbers to grow properly, and to cultivate the cucumbers in a clean environment without contamination of air.

When evaluating the energy savings, the heat storage type of heat storage air-conditioning system was reduced by 73.9% compared with diesel.

As described in detail above, through the horticulture air-conditioning and heating device using the present invention geothermal,

By using only geothermal and solar heat as 100% energy sources, it saves more than 70% of energy compared to using fossil fuels, which reduces farming costs and increases farm income by securing price competitiveness for agricultural products. Unlike petroleum fuels, there is no problem of environmental pollution because there is no greenhouse gas and soot as practical use of eco-friendly energy, and it can be replaced by low-temperature crops by cooling in summer, and it has almost no deterioration in performance, so its life is semi-permanent. The cost of maintenance is low, the greenhouse is clean, environment-friendly, no pollution, cultivation is not only improved quality and efficient production, but also the endless use of the field as a clean alternative energy, the effect is a great design.

Claims (5)

In the facility horticulture air conditioning unit, An underground heat exchanger (10) for retrieving the thermal characteristics and analyzing the thermal characteristics to be embedded at an appropriate location, and simultaneously recovering the geothermal heat and solar heat storage; A heat pump device 20 which draws heat from the ground; A heat storage tank 30 for condensing the heat; A pipe 60 for moving the heat medium in the heat storage tank 30; Facility horticulture cooling and heating device using geothermal heat including a blower 40 The method of claim 1, Ground heat exchanger (10) is a horticulture air-conditioning and heating device using geothermal heat, including landfilling more than 50 cm 1m from the surface The method of claim 1, The bottom pump apparatus 20 is composed of an evaporator 21, a four-way valve 22, an expansion valve 23, a compressor 24, a condenser 25 by both heat transport, and the geothermal heat evaporator 21 during heating. Facility horticulture air-conditioning and heating equipment using geothermal heat that includes condensation in the condenser 25 by heating and transporting and compressing to raise the temperature of the heat medium to the extent possible The method of claim 1, The heat pump device 20 is composed of an evaporator 21, a four-way valve 22, an expansion valve 23, a compressor 24, a condenser 25 by both heat transport, and heats the condenser 25 during cooling. Facility horticulture air-conditioning and heating device using geothermal heat, including heat dissipation into the soil to lower the temperature of the heat medium to an acceptable level, and to allow cooling through the evaporator 21 through the compressor 24. The method according to claim 3, 4, Heat pump device 20 is installed in the refrigerant flowmeter to analyze the cycle of each component and measuring device 50 such as temperature sensor and pressure sensor at the inlet and outlet of the evaporator 21, condenser 25, compressor 24 Facility horticulture air conditioning equipment using geothermal heat comprising each