Browsing by Author "Han, Jianbo"

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A comprehensive review on building integrated phase change floors with phase change materials for energy storage and indoor environment control
(2024-09-15) Wang, Tianyu; Wang, Haichao; Wang, Anqing; Lahdelma, Risto; Wang, Gang; Han, Jianbo
A2 Katsausartikkeli tieteellisessä aikakauslehdessä
Phase change floor (PCF) integrated with phase change materials (PCMs) can achieve latent heat storage, reduce system energy consumption, and improve indoor thermal comfort. Many studies have conducted extensive work from various perspectives with the continuous advancement in research on PCF. Therefore, a review of the relevant research on PCF is provided. It categorizes PCF based on its applications and integration methods. The PCMs used for PCFs are summarized in more detail, including thermophysical parameters and some mechanical properties. The influence of structural optimization design on the performance of PCFs is emphasized. Studies on PCF operating conditions, control strategies, and climate suitability are also described. The numerous evaluation parameters for PCFs are sorted out from three perspectives: thermal comfort, energy and economy. Common experimental and simulation methods for PCF have also received attention. The review makes it evident that the phase change temperature, thermal conductivity, and latent heat of PCMs are crucial factors influencing the performance of PCFs. The distinctive structural design can significantly enhance heat transfer and realize the use of PCFs in both winter and summer. Appropriate operating conditions and control strategies represent effective means of enhancing indoor thermal comfort and improving operating economics. The given reference ranges for PCM thermophysical properties, structural dimensions, and various operating parameters can also be utilized as a guide for engineering design. Additionally, the review also points out the challenges faced in PCF research and provides prospects for future research.
Heat-power peak shaving and wind power accommodation of combined heat and power plant with thermal energy storage and electric heat pump
(2023-12-01) Wang, Haichao; Han, Jianbo; Zhang, Ruoyu; Sun, Mingyi; Sun, Zongyu; Hua, Pengmin; Xie, Zichan; Wang, Hai; Abdollahi, Elnaz; Lahdelma, Risto; Granlund, Katja; Teppo, Esa
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Wind power curtailment becomes a major problem in many countries. The wind accommodation mechanisms and energy saving potentials for the combined heat and power plant with thermal energy storage, electric heat pump and both should be evaluated more systematically and accurately to accommodate more wind power. Heat-power peak shaving capacities for thermal energy storage, electric heat pump and both are analyzed using a graphical method, while the operation strategy is proposed to maximize wind accommodation. A simulation model for wind power accommodation considering the energy balances and constraints of all production units is developed based on EnergyPRO. A regional energy supply system in Jilin Province, China is selected as the case study, where the influences of different peak shaving technologies and their parameters on the wind accommodation and energy saving are studied. The wind curtailment ratio is reduced from 20.31% to 13.04% and 7.51% with thermal energy storage and electric heat pump respectively, and it is further reduced to 4.21% with both. Systems with electric heat pump can save energy from 1.1% to 5.8% with different parameters of the peak shaving devices. It was found that electric heat pump has better accommodation capability than that of thermal energy storage. Wind accommodation can be improved by adding thermal energy storage to electric heat pump, but the effect gradually decreases as the storage size increases. Electric heat pump can increase the system's energy efficiency, but it is not always energy efficient by adding thermal energy storage to electric heat pump. In fact, thermal energy storage should not be too large, otherwise the system's energy efficiency will be reduced.