1. Steam fired absorption unit: Steam is used as the driving energy. According to the working steam grade, can also be divided into single-effect and double-effect type.
2. Direct fired absorption unit : Generally oil, gas and other combustible substances as fuel. Not only can refrigeration, but also for heating and the provision of domestic hot water. Direct fired absorption units according to different fuels can be divided into: fuel type, gas type, dual-fuel type: dual-fuel type can be a machine to use two types of fuel, divided into light oil gas type and heavy oil gas type.
3. Hot water fired absorption unit: LiBr absorption units that use hot water as a heat source. Usually industrial waste heat, waste heat, geothermal hot water, solar hot water as a heat source, according to the temperature of the heat source can be divided into single-effect type and double-effect type.
4. Solar fired absorption unit: energy is obtained from solar collectors and used to heat the solution in the LiBr absorption unit generator for refrigeration cycle.