Absorption heat pumps/chillers and liquid desiccant dehumidification systems are heat-moisture cycles with heat and moisture transport and conversion processes. However, previous studies mainly focused on the external performance and processes of the absorption systems. This paper provides an insight into the internal moisture transport process of the system and analyzes it from a prospective of a cycle. By considering the hygroscopic solution constraint, the expression of the ideal coefficient of performance is more precise and an ideal heat-moisture cycle working between two moisture sources at constant pressure is developed based on the analysis of the absorption chiller, which may guide the improvement of actual systems.
Keywords heat pumps, absorption chiller, coefficient of performance, heat and mass transfer, ideal heat-moisture cycle, hygroscopic solution