Process integration and electrification through multiple heat pumps using a Lorenz efficiency approach
Year: 2024
Type: article
Abstract: Pinch Analysis is a well-established tool used to maximize heat recovery in an industrial process and evaluate the integration of energy conversion units such as heat pumps. This paper introduces a novel method for targeting the minimum shaft required for the electrification of industrial process employing the principles of Pinch Analysis in conjunction with the application of detailed heat pump performance curves. The proposed method deviates from conventional Pinch Analysis by dividing the traditional grand composite curve (GCC) into separate net heat sink and net heat source profiles to enable a more precise and intuitive placement of heat pumps and expansion devices exploiting the heat pockets of the GCC. Further distinguishing itself from previous methodologies, this study employs Lorenz efficiency over exergy efficiency, offering a novel perspective on the role of heat pumps in energy transfer between process streams. The effectiveness of the proposed method is demonstrated through case studies of an industrial milk evaporator and spray dryer. The optimal heat pump configuration, defined by the optimal combination sink and source temperatures, is found for both cases. The proposed method has the potential to bridge the gap between theoretical work targets and actual process and system design.
Source: Energy
Institutions: Technical University of Denmark, University of Waikato
Language: English
Subfield: Control and Systems Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,140
Awards: G3219503836, G6528957610
OpenAlex ID: W4403063943