Abstract
The thermal masses of components influence the performance of many adsorption heat pump systems. However, typically when experimental adsorption systems are reported, data on thermal mass are missing or incomplete. This work provides original measurements of the thermal masses for experimental sorption heat exchanger hardware. Much of this hardware was previously reported in the literature, but without detailed thermal mass data. The data reported in this work are the first values reported in the literature to thoroughly account for all thermal masses, including heat transfer fluid. The impact of thermal mass on system performance is also discussed, with detailed calculation left for future work. The degree to which heat transfer fluid contributes to overall effective thermal mass is also discussed, with detailed calculation left for future work. This work provides a framework for future reporting of experimental thermal masses. The utilization of this framework will enrich the data available for model validation and provide a more thorough accounting of adsorption heat pumps.
Highlights
Many adsorption systems are operated with intermittent heating and cooling of components
The measurements of the module indicated that the thermal mass (TM) of the housing plays a role since heat is transferred from the adsorber and the combined evaporator–condenser to the housing
For each heat exchanger (HX), the TMtotal, sorbent mass, and total heat exchange mass are reported. From these three raw measured values, the MR, specific TM (STM), and ceffective were calculated according to their definitions in Equations (7)–(9)
Summary
Many adsorption systems (including chemisorption systems) are operated with intermittent heating and cooling of components. The thermal mass (TM; the product of mass and specific heat capacity in units of kJ/K) of the components influences performance. Concluded from an overview of existing studies that a key challenge for adsorption systems is the Energies 2020, 13, 1150; doi:10.3390/en13051150 www.mdpi.com/journal/energies. Wittstadt et al (2017) [2] reviewed the recent development for adsorption heat exchangers and pointed out that TM affects efficiency and power density within the cyclic operation of adsorption heat pumps. Modeling of such systems requires an accounting of the TM. Limited experimental data are available that provide a full accounting of the full TM of sorption components
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