Extracting Work from Environmental Thermal Energy via a Process Involving Two ‘Spontaneous’ Entropy Transfers

Abstract

Previous work described an entrochemical system, an energetically closed system which spontaneously creates an internal thermal gradient. This work developed a theoretical description of such systems. The systems can be linked together to increase the overall thermal gradient. This thermal gradient may be used to enable water distillation. In this paper we complete the circle with the design of a 'spontaneous' methodology for recharging the system. We utilize a solar chimney to generate airflow over a draw solution, evaporating water and reconcentrating the solution. The reconcentrated solution is used to restore the original concentration gradient which enables the entrochemical system. We examine a device comprising three major parts: a reaction chamber, a distiller, and a solar chimney. We utilize a 6.096m tall solar chimney with a 0.74m^2 solar collector. This solar chimney enables airflow of 50.96m^3/day. A maximal evaporative capacity of 3.88L/day/m^2 results. This corresponds to an effective energy utilization of 241.4W/m^2. We measure the volumetric efficiency of the redesigned entrochemical distiller at 62.7% . This device generates a distillation rate of 0.416L/day, corresponding to an extrapolated 91.2L/m^2/day or an effective energetic utilization of 2.36kW/m^2. Such systems could be completely placed underneath an enabling solar chimney, consuming 147.6L/m^2/day of ocean water and producing 91.2L/m^2/day distilled water. This corresponds to a maximal power generation capacity of 1.823kW/m^2 when utilized in PRO with ocean water. The process naturally stores entropic potential removing daily solar irradiance limitations and enabling on-demand energy. Waste products are humidified air, which may enable precipitation, and salt crystals.



Author Information
Aaron Jacob Schwartz, Jisan Research Institute, United States
Chris Koo, Jisan Research Institute, United States
Jae Lim, Jisan Research Institute, United States
Ryan Goy, Jisan Research Institute, United States
Sophia Choi, Jisan Research Institute, United States
Sanza Kazadi, Jisan Research Institute, United States

Paper Information
Conference: ACSEE2013
Stream: Sustainability

This paper is part of the ACSEE2013 Conference Proceedings (View)
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