Which situation would cause the strong liquor in the absorber to decrease?

The situation where a decrease in the evaporator load causes the strong liquor in the absorber to decrease is tied to the operational dynamics of absorption chillers or systems using strong liquor (such as a refrigerant). When the evaporator load decreases, there is less cooling demand, which means less refrigerant needs to be vaporized. As a result, there will be a lower concentration of vapor entering the absorber.

This reduced vapor flow translates to a decreased need for strong liquor to absorb the refrigerant vapor effectively. Since the primary function of the absorber is to maintain the necessary concentration of the solution by absorbing the vapor into the strong liquor, a lower evaporation demand means that less strong liquor is required to maintain system equilibrium. Consequently, the strong liquor will naturally decrease due to dilution or less strong liquor being fed into the system compared to the vapor generated.

Therefore, a decrease in the evaporator load is directly related to a decrease in the strong liquor within the absorber, as the absorptive processes adjust to the lower requirement for cooling and vapor absorption.