Comparing exergy and heat pump work in distillation systems

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2025-05-21 DOI:10.1002/aic.18895

Akash Sanjay Nogaja, Mohit Tawarmalani, Rakesh Agrawal

引用次数: 0

Abstract

This study compares the exergy supplied to a distillation column with the actual energy consumption of a heat pump-assisted distillation (HPAD) system. It evaluates the reliability of exergy as a proxy for heat pump work demand in such systems. While exergy can serve as a reasonable approximation when the thermal duties of the source and sink are nearly equal, it is not a consistent indicator of heat pump work in general. To address this limitation, we propose the Minimum Heat Pump Work Model, which establishes a theoretical lower bound on the work required to operate a heat pump between a given set of heat sources and sinks. Unlike exergy, this model is based on the direct thermal interaction between the source and sink, independent of the environment. It offers more accurate predictions of heat pump work and provides useful insights for designing energy-efficient configurations in hybrid and multicomponent distillation systems.

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在蒸馏系统中比较火用和热泵的工作

本研究比较了提供给精馏塔的能量与热泵辅助蒸馏（HPAD）系统的实际能量消耗。它评估的可靠性，作为一个代理的热泵工作需求在这样的系统。虽然当源和汇的热负荷几乎相等时，用能可以作为合理的近似值，但它通常不是热泵工作的一致指标。为了解决这一限制，我们提出了最小热泵功模型，该模型建立了在给定的热源和汇之间运行热泵所需的功的理论下限。与火用不同，该模型基于源和汇之间的直接热相互作用，与环境无关。它提供了热泵工作更准确的预测，并为设计混合和多组分蒸馏系统中的节能配置提供了有用的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.