Ultra-low temperature convective radiation heating system based on porous adobe heat storage

Abstract

The invention relates to a porous adobe heat storage ultralow temperature convection radiant heating system which comprises a house foundation, walls and a porous adobe heat storage ultralow temperature convection radiant heating system, wherein the porous adobe heat storage ultralow temperature convection radiant heating system comprises an adobe heat storage device, a hot air duct, a cold air duct, a hot air louver and a cold air louver; the adobe heat storage device comprises a porous adobe assembly, an upper converge passage, a lower converge passage and an envelop enclosure around; the upper converge passage and the lower converge passage are arranged at two ends of a vent hole of the porous adobe assembly. The system disclosed by the invention uses air as a heat transfer medium, uses the building foundation as a heat storage space, uses porous adobes as a heat storage medium and uses low-temperature radiant heating and natural convection of cold and hot air as main heating modes.

Description

technical field [0001] The invention relates to the technical fields of energy storage and heating ventilation, in particular to an ultra-low temperature heating system which utilizes adobe to store heat and heat a room through convection and radiation. Background technique [0002] Since solar energy is intermittent and unstable, while thermal energy for building heating in winter needs to be continuous and stable, it is necessary to develop low-cost heat storage and heating technologies in the process of applying solar energy to building heating. The efficiency of the solar collector has an inverse relationship with its outlet temperature. The low-temperature heat storage heating system can effectively reduce the outlet temperature required by the solar collector and improve its conversion efficiency. At present, the commonly used low-temperature heating technology is mainly low-temperature floor radiation heating technology. This technology mainly uses the ground radiatio...

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Problems solved by technology

[0005] 1. Heat storage materials are not easy to obtain

Pebbles are used as heat storage materials. Although pebbles are cheap, for areas such as plains, deserts, and high loess sources, pebbles are not easy to obtain, and they have to be transported over long distances, so the cost is high; while using concrete as heat storage materials requires large In case of capacity heat storage, the heat storage needs a large volume and its cost is also high

[0006] 2. The shape of the heat storage body is irregular, and it is difficult to form regular stacking required for good ventilation and heat exchange

The shape of the pebble heat storage body is mostly an irregular ellipse formed randomly by water flow erosion, and the size is different. When the required heat storage body is large, it is difficult to stack a large number of them in a regular manner, and random stacking makes some areas The flow resistance is small, the air flow rate is large, and the heat storage and release effect is good. In some areas, the flow resistance is large, the air flow rate is small, and the heat storage and release effect is poor.

[0007] 3. It is difficult to store and release heat inside a solid heat storage body

The irregular elliptical shape formed by the pebble heat storage body is easy to store and release heat on the surface layer, but the heat storage and release of the internal material must pass through the heat conduction of the stone to reach the surface, and the thermal conductivity of the stone is low, generally at 2.5W / (m·K), so for large-sized pebbles, it is difficult to transfer heat from the surface of the pebbles to the center; Pebble bodies together have poor heat storage and release capacity

[0008] 4. Energy consumption during heating

When the low-temperature floor radiant heating method cannot meet the heating power requirements of the room, this technology starts the exhaust fan to directly transport the hot air in the heat storage body to the room. At this time, it needs to consume additional energy to heat the room, which increases the installation cost of the system. and heating operating costs

[0009] 5. A large temperature difference is required for effective heating

Although the low-temperature floor radiant heating technology has a lower heating temperature than ordinary radiators, it also needs to have a higher heating power when the temperature is 15°C higher than the room temperature. When the temperature is low, the heating power drops significantly, which cannot effectively guarantee the warm temperature in the room.

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