Solar heating system for geological trans-seasonal heat accumulation

Abstract

The invention discloses a solar heating system for geological trans-seasonal heat accumulation. A solar heating unit is in matched connection with a solar heat collector and a floor-heating-pipe radiant heating system respectively through pipelines. A geological heat reservoir in matched connection with the solar heating unit is buried in the earth's crust under the surface of the earth. The geological heat reservoir is composed of a heat-insulating shell, a solid heating accumulator and heat exchangers, and is arranged in a pit dug on the surface of the earth and positioned below a tundra of the earth's surface. The solid heat accumulator is wrapped and sealed by the heat-insulating shell, and the heat exchangers and a heat-exchanging working medium delivery pipeline are buried in the solid heat accumulator. The heat-exchanging working medium delivery pipeline is composed of a heat-exchanging working medium input pipeline and a heat-exchanging working medium output pipeline. A heat-exchanging working medium inlet at the first end of a geological heat-exchanging unit composed by the heat exchangers is correspondingly communicated with a heat-exchanging working medium outlet of the solar heating unit through the heat-exchanging working medium input pipeline. A heat-exchanging working medium outlet at the tail end of the geological heat-exchanging unit is correspondingly communicated with a heat-exchanging working medium inlet of the solar heating unit through the heat-exchanging working medium output pipeline. The solar heating system can convert solar energy in hot seasons into heat energy which is trans-seasonally stored for heating in heating seasons.

Description

technical field [0001] The invention relates to the technical field of solar heat utilization, in particular to a solar energy underground inter-season heat storage and heating system. Background technique [0002] Solar heating system is a new type of heating system. Compared with traditional central coal-fired gas heating and widely used water ground source heat pump heating, it has many advantages: sustainable energy supply, safe and reliable, no pollution, high efficiency and energy saving, Low running cost. The main disadvantages of the existing solar water tank heat storage heating system are as follows: [0003] 1. The heat storage time is short, and the solar energy resources of the year cannot be fully utilized—①The main reasons for the short heat storage time of the water tank are: First, the heat loss of the water tank heat storage in the atmospheric environment is very large. At present, domestic and foreign The developed solar heating system uses a water tank ...

AI Technical Summary

Problems solved by technology

[0003] 1. The heat storage time is short, and the solar energy resources of the year cannot be fully utilized—①The main reasons for the short heat storage time of the water tank are: First, the heat loss of the water tank heat storage in the atmospheric environment is very large. At present, domestic and foreign The developed solar heating system uses a water tank as a heat storage device, and uses water as a heat storage material to store heat. ℃~60℃), and the outdoor ambient temperature in winter is low (for example, in severe cold areas, the lowest can reach about -30℃), even if the heat preservation measures are taken for the water tank mining area, the heat loss stored in the water tank will still remain due to the large temperature difference. It is very large, and the solar heat energy that can be used for effective heating is very little; second, the water tank can only store heat for a short time, but not for a long time. The ambient temperature is low, because the heat loss of the water tank in the atmospheric environment is very large, in a short period of time, the heat storage temperature in the water tank will be greatly reduced, so that it cannot reach the heating temperature (such as 35 ℃ ~ 40 ℃), especially In continuous cloudy, rainy and snowy weather, the heat storage and heating system of solar water tanks will completely lose the ability to heat buildings; third, the water tanks are small in size and store less heat, and the heating heat demand of buildings in winter is very large, such as energy-saving building heat The load (that is, the heat required for building heating per square meter per hour at the specified outdoor temperature) is about 130MJ to 150MJ / ㎡ of heat supply, and the building needs about 2340MJ to 2700MJ / ㎡ of heat supply per square meter on a design day. In the coldest month, buildings per square meter need about 70200MJ-81000MJ / ㎡ of heat supply. For a building (group) of 10,000㎡ or tens of thousands of square meters, it is necessary to build a large volume of water tanks for heat storage and heating is unrealistic

②Summer solar energy cannot be effectively used, and only winter solar energy can be used for heating. The solar radiation in summer is about 2 to 3 times that of winter solar radiation. Since the heat storage time of the solar water tank heat storage heating system is very short (generally only a few days) ), it is impossible to store sufficient solar energy resources in summer for heating in winter, and the solar radiant energy in winter is much smaller than that in summer, and encountering cloudy, rainy and snowy days will cause the entire solar heating system to be unusable

[0004] 2. More lighting area is needed, and the limitation is larger - due to the small heat storage time of the water tank and the short heat storage time, in winter, in order to collect more solar energy, it is necessary to configure enough lighting area to collect more solar heat energy. It can meet the heat demand of building heating. First, it causes high cost. Second, in the actual construction process, there is not enough space on the roof of the building for large-area installation of collector arrays, and the actual use is very limited.

[0005] 3. The total heat balance of the system cannot be realized - due to the short heat storage time and small heat storage time of the water tank, the heat it can store can often only meet the heating needs of the building for a few hours to a few days at most, especially in severe cold areas. The heating time in winter is long (such as 4320 hours), and the heating heat required is also large. The use of solar water tank heat storage heating system cannot meet the heating needs of buildings.

[0006] 4. The dynamic heat balance of the system cannot be realized—①The winter temperature is inversely proportional to the solar radiation, and the winter temperature change is also inversely proportional to the solar radiation. Especially in severe cold regions, the relationship between temperature and sunlight has the following laws: 1. The lower the temperature, the smaller the amount of solar radiation; the second is cloudy and snowy weather, the temperature is lower and there is no sunlight; the third is that the temperature is very low at night and there is no sunlight; the fourth is that the temperature is low in the morning, with less sunlight, and the temperature is slightly higher at noon , much sunshine

②The dynamic heat balance of building heating cannot be realized. In cold regions, especially severe cold regions, the heating heat demand of buildings in winter is directly proportional to the outdoor temperature, while the heating heat demand is inversely proportional to the solar radiation. The existing solar water tank heat storage heating The heat storage time of the water tank used in the system is short, the heat storage capacity is small, and the dynamic imbalance caused by temperature changes, solar radiation changes, and heating heat demand changes cannot be adjusted, and the dynamic heat balance of building heating in the pointer sense cannot be realized.

[0007] 5. In cold areas and severe cold areas, the heating demand of buildings cannot be met—in cold areas, the rigid demand for indoor heating of buildings in winter must be ensured, and the existing solar water tank heat storage heating system cannot meet the heating required for the entire heating season Generally speaking, if there are no other auxiliary measures (such as auxiliary electric heating, coal or oil heating, etc.), the solar water tank heat storage heating system cannot be used in cold areas, especially in severe cold areas, let alone To meet the heating needs of large buildings or building groups (residential buildings)

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