Geocooling with integrated PCM thermal energy storage in a commercial building

Khaled

Renewable and Sustainable Energy Reviews

et al. 2020

332

Sharing of renewable energy and reduction of conventional energy consumption as an attempt to ameliorate environmental issues such as global warming has become the main concern for current developing scientific engineering research. Moreover, with the drastic increase in cooling and heating requirements in the building sector worldwide, the need for suitable technology that enables improvement in thermal performance of buildings is addressed. Utilizing phase change materials (PCMs) for thermal energy storage strategies in buildings can meet the potential thermal comfort requirements when selected properly. The current research article presents an overview of different PCM cooling applications in buildings. The reviewed applications are classified into active and passive systems. A summary of the used PCMs and their respective properties are presented as well. Primary results of the studied systems are demonstrated to be efficient in reducing indoor temperature fluctuations and energy demand during cold seasons along with the capability of triggering load reduction or shifting. Highlights  A state-of-the-art review on cooling applications of PCM in buildings  Cooling PCM applications are classified as active and passive systems  PCM serves as a promising technology for energy-efficient buildings  Combining active and passive systems can be a potential step toward NZEB

Section: Geocoolingmentioning

confidence: 99%

Phase change material thermal energy storage systems for cooling applications in buildings: A review

Khaled

Renewable and Sustainable Energy Reviews

et al. 2020

332

“…Another interesting system is “geothermal free cooling”, also known as “geocooling”, in combination with TS [ 49 ]. The authors developed and validated a spherically encapsulated PCM tank model and carried out simulations within TRNSYS for a lightweight commercial building located in a Mediterranean climate.…”

Section: Review Of Thermal Storages With Pcm In Building’s Hydronimentioning

confidence: 99%

Phase-Change Materials in Hydronic Heating and Cooling Systems: A Literature Review

et al. 2020

When considering the deployment of renewable energy sources in systems, the challenge of their utilization comes from their time instability when a mismatch between production and demand occurs. With the integration of thermal storages into systems that utilize renewable energy sources, such mismatch can be evened out. The use of phase-change materials (PCMs) as thermal storage has a theoretical advantage over the sensible one because of their high latent heat that is released or accumulated during the phase-change process. Therefore, the present paper is a review of latent thermal storages in hydronic systems for heating, cooling and domestic hot water in buildings. The work aims to offer an overview on applications of latent thermal storages coupled with heat pumps and solar collectors. The review shows that phase-change materials improve the release of heat from thermal storage and can supply heat or cold at a desired temperature level for longer time periods. The PCM review ends with the results from one of the Horizon2020 research projects, where indirect electrical storage in the form of thermal storage is considered. The review is a technological outline of the current state-of-the-art technology that could serve as a knowledge base for the practical implementation of latent thermal storages. The paper ends with an overview of energy storage maturity and the objectives from different roadmaps of European bodies.

“…This enormous increase was a consequence to the growth in world's population that stimulated the evolution of economy and energy demand [1]. Buildings proved to be accumulating for the largest energy consumption quantity world-widely, with a percentage ranging between 30-40% 1 [2][3][4][5], that is expected to rise up by 2050 reaching 50% [6]. The majority of energy consumed within the building sector is directed toward heating and cooling systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Use of Enhanced Coconut Oil and Paraffin Wax Phase Change Material in Active Heating Using Advanced Modular Prototype

Khaled

Journal of Energy Storage

et al. 2021

The use of phase change materials in buildings as a thermal energy storage system gained the attention of researchers all over the world. In the current study, coconut oil bio-based PCM is macro-encapsulated with enhanced thermal conductivity containers and coupled with hydronic radiant floor heating system. The study follows experimental aspect utilizing two identical small scale modular test prototypes. Investigations are directed toward studying the effect of the active CO-PCM system under different weather conditions, effect of combining active and passive systems, effect of PCM choice/type and effect of PCM location within the active floor, on the thermal and energy storage performances. Results revealed that coupling CO-PCM to active floor, passive wall and passive roof is capable of achieving load shifting and energy savings; and is affected by the control method, weather conditions, electricity tariff policy and PCM position and type. Further discussions, conclusions and perspective recommendations are summarized within the article. Highlights Identical experimental advanced modular prototypes are designed and implemented.  Macro-encapsulation technique using enhanced thermal conductivity containers.  Thermal comfort and temperature fluctuations reduction using CO and PW PCMs.  Load shifting by combined CO-PCM applications leads to possible annual cost saving.  Positioning CO-PCM plates below heating layer ensued energy saving of 393.5 kWh.