Experimental investigation of an off-grid photovoltaic heat pump collection system with heat collecting as a core

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2024-11-24 DOI:10.1016/j.applthermaleng.2024.125004

Xiaodong Dong, Yue Liu, Zewei Pu, Lusang Zhang

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Abstract

In this study, an off-grid solar photovoltaic heat pump collection system with heat collection as a core is proposed and experimentally verified. The proposed system consists of coupled photovoltaic and heat pump (HP) systems. In the proposed design, intelligent control strategies are used to ensure that during the day, under high temperature and low humidity conditions, solar energy can be converted into thermal energy. The electricity generated by solar photovoltaic (PV) modules is used to drive an HP for heat collection with a high efficiency. By using an energy storage battery, the proposed system can temporarily store abundant solar energy in the form of electrical energy, thus supplementing the energy required by the HP when solar radiation is insufficient, which improves the PV conversion efficiency. Furthermore, an energy output ratio is introduced to characterize the off-grid photovoltaic heat pump collection system’s operational status. In practical applications, the PV module number has a significant effect on the operating time of HP systems, directly affecting the system’s comprehensive heat collection efficiency (CHCE). A test-bed set up in Lasa, Xizang, China, is used in this study, and a series of all-day experiments are performed to analyze the operational characteristics of the proposed system. This study also discusses the influence of the PV module number and the HP start-up time on the system’s CHCE value. Moreover, an analysis is conducted to determine the relationship between the PV module number and the HP start-up time. The experimental results show that the proposed system has high CHCE and good operational stability when transforming solar energy into heat. The maximum instantaneous CHCE of the proposed system can reach 93 %, and the daily CHCE can reach 72 %. This verifies that the proposed system has research and practical significance, as well as significant application potential.

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以集热为核心的离网光伏热泵收集系统的实验研究

本研究提出了一种以集热为核心的离网太阳能光伏热泵集热系统，并进行了实验验证。该系统由光伏和热泵（HP）耦合系统组成。在拟议的设计中，采用了智能控制策略，以确保在白天高温低湿的条件下，太阳能可以转化为热能。太阳能光伏（PV）模块产生的电能用于驱动 HP，以高效率收集热量。通过使用储能电池，拟议的系统可以将丰富的太阳能以电能的形式暂时储存起来，从而在太阳辐射不足时补充 HP 所需的能量，从而提高光伏转换效率。此外，还引入了能量输出比来表征离网光伏热泵收集系统的运行状态。在实际应用中，光伏组件数量对热泵系统的运行时间有很大影响，直接影响系统的综合集热效率（CHCE）。本研究利用在中国西藏拉萨建立的试验台，进行了一系列全天候实验，以分析拟议系统的运行特性。本研究还讨论了光伏组件数量和 HP 启动时间对系统 CHCE 值的影响。此外，还分析了光伏组件数量和 HP 启动时间之间的关系。实验结果表明，拟议系统在将太阳能转化为热能时具有较高的 CHCE 值和良好的运行稳定性。拟议系统的最大瞬时 CHCE 可达到 93%，日 CHCE 可达到 72%。这验证了所提系统具有研究和实用意义，以及巨大的应用潜力。

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

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.