Browsing by Author "Amini, Shahriar S"

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    A Novel Method for the Integration of a Low Temperature Direct Air Capture with an Air Source Heat Pump
    (University of Alabama Libraries, 2023) Ilojianya, Valentine Ikenna; Amini, Shahriar S
    Climate change poses a significant challenge, demanding innovative strategies for mitigation. Integrated assessment models stress the urgency of employing technology to remove carbon dioxide from the atmosphere, making Direct Air Capture (DAC) a prominent method. DAC's success relies on providing heat to release captured CO2 in its operational cycle. This study introduces a novel approach, utilizing Air Source Heat Pumps (ASHP), a well-established technology that extracts heat from the air to generate steam, facilitating CO2 capture. A critical advancement is the use of a transcritical cycle ASHP, capable of producing 100°C steam, aligning with DAC's thermal needs during regeneration. Through process modeling, an integrated ASHP and DAC system, using the sorbent TRI-PE-MCM-41 with a carbon capture rate of 1100 kg/day, is proposed. This system not only supplies thermal energy for CO2 desorption but also cools the sorbent, aligning with DAC processes. The ASHP generates steam for CO2 desorption, enhancing energy efficiency. Environmental sustainability is a priority, and low ozone depletion and low global warming potential working fluids like CO2 and Isobutane are assessed for ASHP operation. ASHPs delivering 100°C steam significantly improve DAC efficiency, reducing energy consumption in the DAC compressor and fans. This results in energy savings of 22.54% (with CO2) and 61.05% (with Isobutane) and potential cost savings of up to $40.27 per ton of captured CO2. Importantly, this integrated technology is adaptable to various sites, requiring only an electrical power supply for ASHP operation, making it an environmentally responsible solution. The study also explores the feasibility of using photovoltaic panels to meet the electricity needs of the ASHP.