May 10, 2014
Both ground source heat pump and air source heat pump are energy-saving and environmentally friendly heating and cooling equipment systems. Both use advanced heat pump technology to convert energy, but their conversion methods are different: ground source heat pump uses soil heat to convert energy, while air source heat pump uses air source heat pump technology to convert energy, but there are still some differences between the two.
Comparison between ground source heat pump and air source heat pump:
1. Ground source heat pump heating is more energy-efficient, but it requires well digging. Installation requires the conditions for digging wells. The initial cost will be relatively high, which is suitable for villas, schools and other places.
2. Air source heat pump does not require well digging, only air is needed, and the space occupied is relatively small, which is suitable for high-rise buildings.
3. Ground source heat pump has main unit, terminal and underground buried pipe system, while air source heat pump only has main unit and terminal, which is relatively simple to operate.
4. The temperature of ground source heat pump is more stable than that of air source heat pump. Ground source heat pump uses soil heat exchange. The temperature of soil is relatively constant throughout the year, while air source heat pump uses air.
Ground source heat pump
Ground source heat pump refers to all heat pumps that use the earth as a cold and heat source, including soil heat pump (i.e. ground coupling heat pump), groundwater heat pump, surface water heat pump (including water from rivers, lakes and seas), etc. Strictly speaking, ground source heat pump belongs to a type of water source heat pump.
Advantages
1. Low heating operation cost
Ground source heat pump uses the relatively stable underground temperature throughout the year. The COP value is as high as 4 or more. When the same cooling and heating effect is produced, the ground source heat pump saves 30%-40% of electricity than general central air conditioners.
2. Energy saving and environmental protection
The indoor side is transported by chilled water, reducing the amount of refrigerant filling, thereby reducing pollution to the atmosphere; the outdoor heat exchange environment is changed from the atmosphere to the soil or water, thereby reducing atmospheric heat emissions and reducing the heat island effect. It only consumes a small amount of electricity, and will not produce carbon dioxide or other polluting gases during operation, nor will it affect the health of indoor personnel due to leakage.
Disadvantages
The initial investment of ground source heat pumps is relatively high. The initial investment of a small household ground source heat pump system is more than 100,000 yuan, and the cost of large commercial ground source heat pumps is even higher. Therefore, ground source heat pump projects are mostly used in projects with large heating areas such as residential areas and industries.
Air source heat pump
The air source heat pump is driven by electricity, using the heat in the air as a low-temperature heat source, using the compressor to do work, and exchanging heat through the air conditioner condenser or evaporator, and then extracting or releasing heat energy through the circulation system, and using the unit circulation system to transfer energy to the needs of users in the building. Compared with ground source heat pumps, which are mostly used in large heating areas, air source heat pumps are more often used in small and medium-sized heating projects of households or hundreds of meters or thousands of square meters.
Advantages
1. Wide application range
The applicable temperature range is -25 to 40℃, and it can be used all year round. It is not affected by bad weather such as cloudy, rainy, snowy and winter nights, and can be used normally.
2. Low operating cost
The energy saving effect is outstanding; compared with solar water heaters with gas, electricity and electric auxiliary heating, the cost is the lowest throughout the year.
3. Environmentally friendly products
No pollution, no combustion emissions, and no harm to the human body.
Disadvantages
1. Since the air source is a decentralized energy source, the heating speed is slow and the thermal efficiency is not very high.
2. Air source heat pump heating is prone to frost problems and is restricted by region. In an extremely low temperature environment of -30℃ or lower, there is less heat energy in the air, and the heat energy that can be converted is limited, so the working efficiency will be greatly reduced.
