Publications

Nov, 2025

Journal

Enhancing Heat Pump Water Heater Performance with Embedded Phase Change Materials Thermal Energy Storage: First Hour Rating Improvement and Demand Response Operation

The increasing global emphasis on energy efficiency and sustainability has put heat pump water heaters (HPWHs) in the spotlight as an energy-efficient alternative to traditional water heating systems. However, their widespread adoption is limited by challenges such as insufficient First Hour Rating (FHR), suboptimal control mechanisms, and limited flexibility for demand re…

Aug, 2025

Journal

Benefits of Dual Fuel Heat Pump Grid-responsive Control: A Model-based Control Optimization Approach Using Building and Equipment Co-simulation

Conventional dual fuel heat pumps lack the intelligent control mechanisms to efficiently manage the switch between heat pump and furnace, leading to sub-optimal energy usage and, in some cases, increased operating costs. To resolve this gap, this study applies optimized control on hybrid heat pumps. With a focus on equipment control strategies, we compare the performances…

Dec, 2024

Journal

Energy dataset of Frontier supercomputer for waste heat recovery

The Hewlett Packard Enterprise–Cray EX Frontier is the world’s first and fastest exascale supercomputer, hosted at the Oak Ridge Leadership Computing Facility in Tennessee, United States. Frontier is a significant electricity consumer, drawing 8–30 MW; this massive energy demand produces significant waste heat, requiring extensive cooling measures. Although harnessing this…

Nov, 2024

Journal

Demonstration of the carbon capture with building make-up air unit

Building-integrated carbon capture technology has the potential to reduce the cost of CO2 capture while improving indoor air quality (IAQ). To promote the adoption of CO2 capture in a building environment, this study investigated the possibility of integrating carbon capture technology with an existing rooftop make-up air unit (MAU) system to trap CO2. Here, a modular comp…

Nov, 2024

ORNL Report

CRADA NFE-23-09719 Final Report – Residential Cold Climate Heat Pump Technology Challenge (Bosch)

Nov, 2024

ORNL Report

CRADA NFE-23-09578 Final Report – Residential Cold Climate Heat Pump Technology Challenge (York International (JCI))

Oct, 2024

ORNL Report

CRADA NFE-23-09836 Final Report – Isothermal Compressor Computational Fluid Dynamics Simulations – Lambda Design

Sep, 2024

ORNL Report

CRADA NFE-22-09213 Final Report – Residential Cold Climate Heat Pump Technology Challenge (Trane)

Sep, 2024

ORNL Report

CRADA NFE-22-09374 Final Report – Residential Cold Climate Heat Pump Technology Challenge (Rheem)

Aug, 2024

ORNL Report

CRADA NFE-22-09321 Final Report – Isothermal Compressor Computational Fluid Dynamics Simulations

Aug, 2024

ORNL Report

Liquid piston with spray cooling near-isothermal compressor

Jun, 2024

Journal

A multifunctional rooftop unit for direct air capture

Direct air capture (DAC), which captures CO2 from ambient air, is a critical technology to reduce greenhouse gases in the atmosphere in order to avoid climate disasters. Due to the relatively low concentration of CO2 (400 ppm), a large amount of air needs to be moved through DAC devices, which requires lots of energy. Currently, DAC technologies are deployed mainly in cent…