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Professor JO DARKWA's Outputs (72)

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.

The role of green roofs on reducing heating and cooling loads: a database across Chinese climates (2011)
Journal Article
Kokogiannakis, G., Tietje, A., & Darkwa, J. (2011). The role of green roofs on reducing heating and cooling loads: a database across Chinese climates. Procedia Environmental Sciences, 11(B), https://doi.org/10.1016/j.proenv.2011.12.094

This paper aims to use detailed modelling techniques and develop a database for assessing in a quick and easy way the energy performance of green roof designs across a range of Chinese climates. The focus is on heating and cooling loads by calculatin... Read More about The role of green roofs on reducing heating and cooling loads: a database across Chinese climates.

A simulation-based framework for a mapping tool that assesses the energy performance of green roofs
Presentation / Conference Contribution
Kokogiannakis, G., & Darkwa, J. A simulation-based framework for a mapping tool that assesses the energy performance of green roofs. Presented at International Congress on Informatics, Environment, Energy and Applications (IEEA 2012)

This paper presents a framework for the development of a GIS open source mapping tool that aims to disseminate a database with results of detailed simulations in order to assess in a quick and easy way the energy performance of green roof designs acr... Read More about A simulation-based framework for a mapping tool that assesses the energy performance of green roofs.