Air conditioning cold source includes natural cold source and artificial cold source. The natural cold sources are mainly tunnel air and deep well water. The deep well water can be used as the cold source of comfort air conditioning to treat air, but if the water volume is insufficient, it cannot be widely used. The tunnel air is mainly used to send the cold air in underground caves and civil air defense tunnels to the use sites for ventilation and cooling. The use of deep well water and tunnel air is characterized by energy saving and low cost. However, due to various conditions, it can not be applied anywhere.
The artificial cold source mainly uses various types of refrigerators to prepare low-temperature cold water to treat air or directly treat air. The advantage of artificial refrigeration is that it is not limited by conditions and can meet any air environment required, so it is widely used by users. Its disadvantages are large initial investment and high operation cost.
The heat source of air conditioning mainly includes independent boiler room and central heating network. The heat medium provided by the independent boiler room can be either hot water or steam, or hot water and steam can be supplied at the same time, that is, steam water dual-use boiler. The fuel used by the boiler can be coal (coal-fired boiler), oil (oil fired boiler), and gas (gas fired boiler).
