Which condition increases the efficiency of lithium bromide absorption systems?

Lowering the humidity in the evaporator enhances the efficiency of lithium bromide absorption systems because it helps to improve the effectiveness of the evaporation process. In lithium bromide systems, the evaporator is where the refrigerant absorbs heat by evaporating at low pressure, and this process is significantly influenced by the moisture content in the air.

When the humidity is lower, the amount of water vapor present is reduced, allowing the lithium bromide solution to absorb more heat from the system, effectively increasing the cooling capacity. A lower humidity level directly correlates with a greater temperature differential, which leads to improved system performance. High humidity can lead to the saturation of the air with moisture, reducing the refrigerant's ability to absorb heat and lowering the overall efficiency of the system.

Thus, maintaining lower humidity levels facilitates better heat exchange within the evaporator, directly contributing to the overall efficiency of the absorption refrigeration process.