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Experimental comparison of green facades with outdoor test cells during a hot humid season (2019)
Journal Article
Kokogiannakis, G., Darkwa, J., Badeka, S., & Li, Y. (2019). Experimental comparison of green facades with outdoor test cells during a hot humid season. Energy and Buildings, 185, 196-209. https://doi.org/10.1016/j.enbuild.2018.12.038

We used outdoor test cells during a hot humid period to analyse the surface temperatures behind the following four types of green walls: a felt layer wall; a planter boxes wall; a direct climbing plants wall, and; an indirect climbing plants wall. We... Read More about Experimental comparison of green facades with outdoor test cells during a hot humid season.

Experimental investigations into the adsorption enhancement in packed beds using Z-Annular flow configuration (2018)
Journal Article
Yeboah, S., & Darkwa, J. (2019). Experimental investigations into the adsorption enhancement in packed beds using Z-Annular flow configuration. International Journal of Thermal Sciences, 136, 121-134. https://doi.org/10.1016/j.ijthermalsci.2018.10.027

Annular packed bed structures have the potential to overcome limitations of conventional fully packed bed types by offering radial distribution of airflow within them to enhance fluid-solid contact during adsorption and also to minimize pressure drop... Read More about Experimental investigations into the adsorption enhancement in packed beds using Z-Annular flow configuration.

Nano-silicon dioxide hydrosol as surfactant for preparation of microencapsulated phase change materials for thermal energy storage in buildings (2018)
Journal Article
Su, W., Darkwa, J., & Kokogiannakis, G. (2018). Nano-silicon dioxide hydrosol as surfactant for preparation of microencapsulated phase change materials for thermal energy storage in buildings. International Journal of Low-Carbon Technologies, https://doi.org/10.1093/ijlct/cty032

Microencapsulated phase change materials (MEPCMs) have been recognized as potential energy storage materials for applications such as balancing of heating and cooling loads in buildings. However, current MEPCMs do suffer from low thermal conductivity... Read More about Nano-silicon dioxide hydrosol as surfactant for preparation of microencapsulated phase change materials for thermal energy storage in buildings.

Thermal performance of a novel helically coiled oscillating heat pipe (HCOHP) for isothermal adsorption: an experimental study (2018)
Journal Article
Yeboah, S., & Darkwa, J. (2018). Thermal performance of a novel helically coiled oscillating heat pipe (HCOHP) for isothermal adsorption: an experimental study. International Journal of Thermal Sciences, 128, https://doi.org/10.1016/j.ijthermalsci.2018.02.014

Helically Coiled Oscillating Heat Pipes (HCOHPs) have been designed and tested under laboratory conditions to investigate their potential to achieve isothermal adsorption when integrated with a cylindrical solid desiccant packed bed system. The HCOHP... Read More about Thermal performance of a novel helically coiled oscillating heat pipe (HCOHP) for isothermal adsorption: an experimental study.

Preparation of microencapsulated phase change materials (MEPCM) for thermal energy storage (2017)
Journal Article
Su, W., Darkwa, J., Kokogiannakis, G., Zhou, T., & Li, Y. (in press). Preparation of microencapsulated phase change materials (MEPCM) for thermal energy storage. Energy Procedia, 121, https://doi.org/10.1016/j.egypro.2017.07.485

Microencapsulated phase change materials (MEPCM) could be used for energy saving applications in buildings due to their relatively high energy storage capacities at constant temperature, which could passively reduce peak cooling loads in summer. In t... Read More about Preparation of microencapsulated phase change materials (MEPCM) for thermal energy storage.

Heat transfer analysis of an integrated double skin façade and phase change material blind system (2017)
Journal Article
Li, Y., Darkwa, J., & Kokogiannakis, G. (2017). Heat transfer analysis of an integrated double skin façade and phase change material blind system. Building and Environment, 125, https://doi.org/10.1016/j.buildenv.2017.08.034

In this study, the heat transfer in an integrated double skin facade (DSF) and phase change material (PCM) blind system has been theoretically analysed. Both heat transfer and airflow models with CFD methods have been developed for the integrated DSF... Read More about Heat transfer analysis of an integrated double skin façade and phase change material blind system.

Multiphase change materials for energy storage application in buildings (2017)
Journal Article
Darkwa, J., & Su, W. (2017). Multiphase change materials for energy storage application in buildings. Journal of Thermophysics and Heat Transfer, 31(4), 791-795. https://doi.org/10.2514/1.T5101

Experimental study has been carried out towards the development of a multiphase change material (MCM) by combining two fabricated microencapsulated phase change materials (MEPCM-oct and MEPCM-eic) samples. The study also covered the characterization... Read More about Multiphase change materials for energy storage application in buildings.

Review of solid–liquid phase change materials and their encapsulation technologies (2017)
Journal Article
Su, W., Darkwa, J., & Kokogiannakis, G. (2017). Review of solid–liquid phase change materials and their encapsulation technologies. Renewable and Sustainable Energy Reviews, 48, https://doi.org/10.1016/j.rser.2015.04.044

Various types of solid–liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid–liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess... Read More about Review of solid–liquid phase change materials and their encapsulation technologies.

Development of microencapsulated phase change material for solar thermal energy storage (2016)
Journal Article
Su, W., Darkwa, J., & Kokogiannakis, G. (2017). Development of microencapsulated phase change material for solar thermal energy storage. Applied Thermal Engineering, 112, https://doi.org/10.1016/j.applthermaleng.2016.11.009

In this paper a novel microencapsulated phase change material (MF-3) has been developed and tested for solar assisted hot water storage systems. Even though the morphology of the sample was affected by the type of emulsifier used for fabrication it r... Read More about Development of microencapsulated phase change material for solar thermal energy storage.

Development of a novel phase change material emulsion for cooling systems (2015)
Journal Article
Shao, J., Darkwa, J., & Kokogiannakis, G. (2016). Development of a novel phase change material emulsion for cooling systems. Renewable Energy, 87, https://doi.org/10.1016/j.renene.2015.10.050

In this paper, a novel phase change material emulsion (PCE-10) consisting of an organic PCM (RT10) and water has been developed. Its thermophysical properties such as heat of fusion, viscosity and sub-cooling temperature have been established. The ch... Read More about Development of a novel phase change material emulsion for cooling systems.

Review of phase change emulsions (PCMEs) and their applications in HVAC systems (2015)
Journal Article
Shao, J., Darkwa, J., & Kokogiannakis, G. (2015). Review of phase change emulsions (PCMEs) and their applications in HVAC systems. Energy and Buildings, 94, https://doi.org/10.1016/j.enbuild.2015.03.003

Phase change material emulsions (PCMEs) are multifunctional fluids consisting of phase change materials (PCMs) and carrier fluids. PCMEs could be potential candidates as heat transfer media in heating, ventilation and air conditioning (HVAC) systems.... Read More about Review of phase change emulsions (PCMEs) and their applications in HVAC systems.

Thermal evaluation of laminated composite phase change material gypsum board under dynamic conditions (2015)
Journal Article
Zhou, T., Darkwa, J., & Kokogiannakis, G. (2015). Thermal evaluation of laminated composite phase change material gypsum board under dynamic conditions. Renewable Energy, 78, https://doi.org/10.1016/j.renene.2015.01.025

Thermal evaluation of non-deform laminated composite phase change material (PCM) gypsum board has been carried out. The theoretical studies covered the analysis of different thicknesses of PCM layers and their corresponding heat transfer rates during... Read More about Thermal evaluation of laminated composite phase change material gypsum board under dynamic conditions.

Evaluation of thermal energy dynamics in a compacted high-conductivity phase-change material (2015)
Journal Article
Darkwa, J., Su, O., & Zhou, T. (2015). Evaluation of thermal energy dynamics in a compacted high-conductivity phase-change material. Journal of Thermophysics and Heat Transfer, 29(2), https://doi.org/10.2514/1.T3911

This study evaluates the concept of developing a nondeform phase-change energy storage material possessing higher thermal conductivity and energy storage density through a pressure compaction process. The theoretical and experimental investigations h... Read More about Evaluation of thermal energy dynamics in a compacted high-conductivity phase-change material.

Simulating Thermochromic and Heat Mirror Glazing Systems in Hot and Cold Climates (2014)
Journal Article
Kokogiannakis, G., Darkwa, J., & Aloisio, C. (2014). Simulating Thermochromic and Heat Mirror Glazing Systems in Hot and Cold Climates. Energy Procedia, 62, 22-31. https://doi.org/10.1016/j.egypro.2014.12.363

This paper investigates the potential energy requirements for heating and cooling when using a thermochromic glazing system on a highly glazed tall office building and comparisons are made with the respective performance of two heat mirror units and... Read More about Simulating Thermochromic and Heat Mirror Glazing Systems in Hot and Cold Climates.

A survey on development of energy service industry in Zhejiang China (2014)
Journal Article
Qu, Y., Wang, X. Y., & Darkwa, J. (in press). A survey on development of energy service industry in Zhejiang China. Applied Mechanics and Materials, 587-589, https://doi.org/10.4028/www.scientific.net/AMM.587-589.140

Energy service industry (ESI) has grown quickly recent year in China. A main and important role in ESI is Energy Service Company (ESCO) which engages in reducing energy consumption through retrofitting the existing facilities. This survey focuses on... Read More about A survey on development of energy service industry in Zhejiang China.

Support for the integration of green roof constructions within Chinese building energy performance policies (2013)
Journal Article
Kokogiannakis, G., & Darkwa, J. (2014). Support for the integration of green roof constructions within Chinese building energy performance policies. Energy, 65, https://doi.org/10.1016/j.energy.2013.11.076

Green roofs could act as a thermal buffer in buildings and offer potential energy savings. However, the energy benefits from green roofs are not usually properly recognised by traditional building energy regulations. Building energy regulations are t... Read More about Support for the integration of green roof constructions within Chinese building energy performance policies.

Simulating the influence of microclimatic design on mitigating the urban heat island effect in the Hangzhou metropolitan area of China (2013)
Journal Article
Shen, T., Chow, D., & Darkwa, J. (2016). Simulating the influence of microclimatic design on mitigating the urban heat island effect in the Hangzhou metropolitan area of China. International Journal of Low-Carbon Technologies, 11(1), https://doi.org/10.1093/ijlct/ctt050

There are many indications that Urban Heat Island (UHI) is a significant contributor to the increased emission of greenhouse gases due to the increase in energy consumption for cooling during summer. Hangzhou is currently the second hottest city in C... Read More about Simulating the influence of microclimatic design on mitigating the urban heat island effect in the Hangzhou metropolitan area of China.

Performance of an integrated solar absorption cooling system in a sub-tropical region (2012)
Journal Article
Darkwa, J., & Fraser, S. (2012). Performance of an integrated solar absorption cooling system in a sub-tropical region. International Journal of Low-Carbon Technologies, 7(3), https://doi.org/10.1093/ijlct/cts024

Evaluation of an integrated solar absorption cooling system located in a sub-tropical region has been carried out. Analysis of the results revealed an operational efficiency of 61% for the solar collectors at a mean differential temperature forumla o... Read More about Performance of an integrated solar absorption cooling system in a sub-tropical region.

Impact of material surface properties on building performance across a variety of climates (2012)
Journal Article
Kokogiannakis, G., Tuohy, P., & Darkwa, J. (2012). Impact of material surface properties on building performance across a variety of climates. International Journal of Low-Carbon Technologies, 7(3), https://doi.org/10.1093/ijlct/cts018

Reflective coatings have been promoted for improved energy performance of buildings and are considered in some building regulations such as the California Title 24 standard. This paper provides an analysis of the energy impact of different internal a... Read More about Impact of material surface properties on building performance across a variety of climates.