When both power and cooling are required by the hospital, the customer activates the generator set. The exhaust from the generator is first directed to the exhaust and hot water absorption chiller after denitrification, serving as the primary heat source. Simultaneously, the jacket water and intercooler water enter the chiller as the secondary heat source. Cooling water is pumped to the cooling tower, where it is cooled and then returned to the absorption chiller. The chilled water produced by the chiller is distributed through a water distributor box and transported to the terminals via pumps.

When the generator set is turned off and only the direct-fired LiBr absorption chiller is operating, the chiller is powered by natural gas to provide cooling for the hospital. The flue gas produced by the direct-fired absorption chiller is discharged through a dedicated chimney. The two on-site direct-fired LiBr absorption chillers are also equipped with a heating function. Typically, both chillers provide heating in the winter and cooling in the summer. During heating mode, the main chiller unit is turned off, and the valve between the high-temperature generator (HTG) and the chiller is closed. In this mode, the absorption chiller functions as a boiler, supplying hot water to the hospital.