Heating air conditioning unit utilizing geothermal resources

A heating air conditioning unit utilizing geothermal resources is composed of a geothermal water circulation line, a lithium bromide solution circulation line and an indoor air heating line. The lithium bromide dilute solution from the dilute solution collecting tank is driven by the dilute solution pump, sprayed on fins of the coil pipe fins and heated by the coil pipe, due to the fact that the saturated vapor pressure of the lithium bromide solution is higher than the vapor partial pressure of outdoor low-temperature gas at the moment, vapor is evaporated from the lithium bromide solution with the low concentration, and the lithium bromide solution becomes a concentrated solution; and the concentrated solution is driven by a concentrated solution pump, is sprayed on a concentrated solution wet curtain, absorbs water vapor evaporated from the geothermal water wet curtain, becomes a dilute solution, and releases absorption heat to heat air, so that the heating process is completed. The geothermal water requir