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SUMMARYThe aim of this work is to assess the possibility and usefulness of accessing low-temperature energy using a carbon dioxide-filled two-phase thermosyphon. Various parameters, such as working fluid filling ratio, coolant mass flow rate, and temperature difference between evaporator and condenser, affect the heat transfer of thermosyphon system. In order to investigate the performance of thermosyphon system, we monitored the temperature distribution along the thermosyphon and measured input heat to evaporator section and output heat from condenser, as well. The results show that the heat transfer rate of this system increases with increasing mass flow rate and bath temperature (waste energy temperature). The results also show that the overall heat transfer coefficient increases with increasing coolant mass flow rate but decreases with increasing the temperature difference between bath and condenser section. The reason for this decrease is partly due to the decreasing of the enthalpy of vaporization of the carbon dioxide with increasing temperature.

The influence of water-soluble polymer adsorption on the flow behavior and oil recovery was investigated. This article presents results from an extensive numerical simulation performed for a two-well model in a five-spot pattern operating under polymer flood followed by waterflood. For different systems of adsorption parameters, slug sizes, and reservoir properties performances were compared in terms of cumulative recovery and water-oil ratio (WOR) at the production well.Properties of polymers and reservoir rocks such as adsorption parameters and vertical permeability heterogeneity are shown to impact the predicted recovery. Improvement in oil recovery and reduction in WOR was obtained for smaller values of adsorption parameters. Polymer flood in reservoirs with a severe permeability contrast between horizontal strata leads to lower volumetric sweep efficiency and displacement efficiency. The size of the polymer bank also affects the predicted recovery.

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