A new simulation approach of air source heat pump adopting the holistic process distributed parameter method and hybrid PID-bisection control algorithm

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-10-01 DOI:10.1016/j.tsep.2024.102957

Wenquan Hu , Guangcai Gong , Xiang Chen , Pei Peng , Xiwen Huang , Fuyu Zhou , Bolin Li , Riming Liu , Bin Qin

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引用次数: 0

Abstract

Air source heat pump (ASHP) faces problems of performance deterioration when operating at low ambient temperature due to the low compression ratio, high discharge temperature, frost accumulation, etc., and may even become nonfunctional at sub-zero-centigrade ambient temperature, requiring attention and tools for studying. This paper proposed a kind of holistic process distributed parameter simulation approach of ASHP system adopting the hybrid PID-bisection (PID: proportional-integral-derivative) control algorithm. Main components of the ASHP are modeled with the distributed parameter method. An adiabatic compression model of two-phase fluid based on thermodynamics is proposed. The PID-bisection control algorithm and variable speed integral PID & bisection control algorithm are proposed and applied to iterative computation of the model. A single/two-stage compression ASHP with an intercooler is simulated by this approach. The average deviation of simulation results of the model from experimental data is not more than 7 %, and the maximum deviation is not more than 18 %. For simulation of single-stage compression mode, the maximum error is not more than 4%. For simulation of two-stage compression mode under low-evaporating-temperature operating conditions, the maximum error is not more than 4 %. Computational speed of the ASHP model is significantly improved by using the PID-bisection control algorithm, and could be further accelerated by using the variable speed integral PID & bisection control algorithm. The proposed simulation approach is not only effective in sophisticated simulation of performance of single-stage and two-stage compression ASHP, but also potential for research on the optimization of the ASHP in cold regions.

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采用整体过程分布参数法和混合 PID 分段控制算法的空气源热泵新仿真方法

空气源热泵（ASHP）在低环境温度下运行时，由于压缩比低、排气温度高、积霜等原因，面临着性能下降的问题，在零摄氏度以下的环境温度下甚至可能无法运行，需要引起重视并借助相关工具进行研究。本文提出了一种 ASHP 系统的整体过程分布式参数仿真方法，采用混合 PID 分段（PID：比例-积分-派生）控制算法。ASHP 的主要组件采用分布式参数法建模。提出了基于热力学的两相流体绝热压缩模型。提出了 PID 分段控制算法和变速积分 PID & 分段控制算法，并将其应用于模型的迭代计算。通过这种方法模拟了带有中间冷却器的单级/两级压缩 ASHP。模型模拟结果与实验数据的平均偏差不超过 7%，最大偏差不超过 18%。对于单级压缩模式的模拟，最大误差不超过 4%。在低蒸发温度运行条件下模拟双级压缩模式时，最大误差不超过 4%。使用 PID 分段控制算法可显著提高 ASHP 模型的计算速度，使用变速积分 PID & 分段控制算法可进一步加快计算速度。所提出的仿真方法不仅能有效地对单级和双级压缩式 ASHP 的性能进行精密仿真，而且对寒冷地区 ASHP 的优化研究也很有潜力。

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

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.