Pareto-optimal performance of one-bed adsorption chillers by easy-to-implement heat-flow-based control

Bau, Uwe

doi:10.1016/j.applthermaleng.2019.03.161

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…For desorption, similar control criteria have been implemented. [40] All conducted experiments are listed in Table 1. Figure 6 shows all volume flows and the inlet temperature of the adsorber and condenser (temperature triple T E,in /35/140 °C).…”

Section: The Lab-scale Adsorption Chillermentioning

confidence: 99%

“…To determine the phase times and consider the trade‐off between COP and SCP, we used the control strategy presented in Bau and Bardow. [ 40 ] The control strategy is based on measuring the heat flow in the evaporator and condenser and is, therefore, easy to implement in the experimental setup. Adsorption is terminated when the current cooling power drops below the average cooling power.…”

Section: Evaluation Of Antifreeze In An Adsorption Chillermentioning

confidence: 99%

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Water and Ethanol as Refrigerant Mixture Enabling Adsorption Cooling below 0 °C

et al. 2023

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Adsorption chillers can avoid two types of greenhouse gas emissions from conventional cooling technologies: energy‐related emissions by utilizing waste heat and refrigerant leakage‐related emissions by employing the natural refrigerant water. However, water restricts the minimal cooling temperature to its freezing point. To overcome this limitation, herein, a boiling antifreeze in adsorption chillers is proposed. For this purpose, a databank of over 12 000 molecules for suitable antifreezes is screened and ethanol is derived as the best candidate. Employing ethanol as antifreeze, the experimental feasibility in a lab‐scale adsorption chiller is demonstrated: ethanol can prevent freezing at a cooling temperature of –5 °C and, thus, extend the operating range of the adsorption chiller. Thereby, the favorable properties of water can be partially retained. Furthermore, water–ethanol mixtures to pure water at a cooling temperature of 10 °C are compared: maximal coefficient of performance (COP) and specific cooling power (SCP) decrease by 45% and 42%, respectively, when 14 mol% ethanol is used instead of pure water. Herein, the influence of ethanol on the adsorbed mass and heat transfer during evaporation are crucial. In summary, boiling antifreezes can extend the operating range of water‐based adsorption chillers below 0 °C.

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Section: The Lab-scale Adsorption Chillermentioning

confidence: 99%

Section: Evaluation Of Antifreeze In An Adsorption Chillermentioning

confidence: 99%