This page has only limited features, please log in for full access.
Cool roofs save energy and are particularly suited for low rise buildings in hot climates. This paper presents results of potential energy savings for existing houses in two islands (Sicily and Jamaica) based on validated thermal models. It also presents the lifecycle environmental impact of the cool paint focussing on both the midpoint and endpoint impact categories and compares these with thermal insulation impact. It was found that significant net energy benefits are possible in both locations by a cool roof, more pronounced in Jamaica, which has no heating demand; savings are comparable with thermal insulation reductions. The environmental impact of cool paint is lower than a variety of thermal insulation materials with the exception of water depletion potential. The main hotspots of the cool paint are the production of the polymer followed by the production of the pigment.
Emmanuel Shittu; Valentina Stojceska; Petra Gratton; Maria Kolokotroni. Environmental impact of cool roof paint: case-study of house retrofit in two hot islands. Energy and Buildings 2020, 217, 110007 .
AMA StyleEmmanuel Shittu, Valentina Stojceska, Petra Gratton, Maria Kolokotroni. Environmental impact of cool roof paint: case-study of house retrofit in two hot islands. Energy and Buildings. 2020; 217 ():110007.
Chicago/Turabian StyleEmmanuel Shittu; Valentina Stojceska; Petra Gratton; Maria Kolokotroni. 2020. "Environmental impact of cool roof paint: case-study of house retrofit in two hot islands." Energy and Buildings 217, no. : 110007.
High Concentrator Photovoltaic Thermal (HCPV/T) systems produce both electrical and thermal energy and they are efficient in areas with high Direct Normal Irradiance (DNI). This paper estimates the lifecycle environmental impact of the HCPV/T 2000x system for both electrical and thermal functionalities. Process-based attributional method following the guidelines and framework of ISO 14044/40 was used to conduct the Life Cycle Assessment (LCA). The midpoint and endpoint impact categories were studied. It was found that the main hotspots are the production of the thermal energy system contributing with 50% and 55%, respectively, followed by the production of the tracking system with 29% and 32% and the operation and maintenance with 13% and 7%. The main contributor to the lifecycle environmental impact category indicators was found to be the raw materials acquisition/production and manufacturing of the thermal energy and tracking systems. The results indicate that the lifecycle environmental impact of the HCPV/T 2000x system is lower compared to fuel-based Combined Heat and Power (CHP) and non-Renewable Energy Sources (non-RES) systems.
Emmanuel Shittu; Maria Kolokotroni; Valentina Stojceska. Environmental Impact of the High Concentrator Photovoltaic Thermal 2000x System. Sustainability 2019, 11, 7213 .
AMA StyleEmmanuel Shittu, Maria Kolokotroni, Valentina Stojceska. Environmental Impact of the High Concentrator Photovoltaic Thermal 2000x System. Sustainability. 2019; 11 (24):7213.
Chicago/Turabian StyleEmmanuel Shittu; Maria Kolokotroni; Valentina Stojceska. 2019. "Environmental Impact of the High Concentrator Photovoltaic Thermal 2000x System." Sustainability 11, no. 24: 7213.
This paper presents the development of a model based on efficiency equations to evaluate the performance of an HCPV/T system and compares its outputs with data of an operational case-study system installed in Palermo, Italy. The model is validated with data of the operational system to show real performance. The model can evaluate (a) the electric efficiency of the InGaP/InGaAs/Ge TJ solar cell and (b) electrical and thermal power/energy production potential of one module. The model predictions are compared with experimental electric and thermal data by obtaining linear regression plots of experimental results vs. analytical results; the R2 for experimental electrical and thermal results are 0.91 and 0.87 respectively. Using the model, the evaluated average daily analytical and experimental InGaP/InGaAs/Ge TJ solar cell efficiencies are 33 % and 25 % respectively; with a maximum daily experimental value of 30 %. It was found that the annual analytical and potential (based on derived equations from experimental data) electric energy produced by one module are 158 kWh/m2/year and 144 kWh/m2/year respectively, while the annual analytical and potential thermal energy are 375 kWh/m2/year and 390 kWh/m2/year respectively.
Emmanuel Shittu; Filippo Paredes; Benedetto Schiavo; Luca Venezia; Sergio Milone; Fabio Montagnino; Maria Kolokotroni. Comparison of operational performance and analytical model of high concentrator photovoltaic thermal system at 2000 concentration ratio. E3S Web of Conferences 2019, 111, 1 .
AMA StyleEmmanuel Shittu, Filippo Paredes, Benedetto Schiavo, Luca Venezia, Sergio Milone, Fabio Montagnino, Maria Kolokotroni. Comparison of operational performance and analytical model of high concentrator photovoltaic thermal system at 2000 concentration ratio. E3S Web of Conferences. 2019; 111 ():1.
Chicago/Turabian StyleEmmanuel Shittu; Filippo Paredes; Benedetto Schiavo; Luca Venezia; Sergio Milone; Fabio Montagnino; Maria Kolokotroni. 2019. "Comparison of operational performance and analytical model of high concentrator photovoltaic thermal system at 2000 concentration ratio." E3S Web of Conferences 111, no. : 1.
Cool roofs are most effective in reducing cooling loads and alleviating overheating in locations with high solar radiation and external air temperature. This paper presents results of an experimental study of a low income house in Jamaica and a computational study in three countries around the equator: Jamaica, Northeast Brazil (Recife) and Ghana. A case-study typical of single storey houses in Jamaica was monitored before and after the installation of a cool paint on the roof; on days with average solar radiation intensity of ∼420 W/m2 and ambient air temperature of ∼28 oC, internal ceiling surface temperature is reduced by an average of 6.8 °C and internal air temperature by 2.3 °C. Monitoring results were used to calibrate successfully an EnergyPlus model; similar models were developed for Ghana and Brazil differing in size and/or construction to reflect country specific practices. Annual simulations indicate that internal ceiling surface temperatures are reduced on average by 3.2 - 5.5 oC and internal air temperatures by 0.75-1.2 oC. Cooling demand simulations (setpoint 24 oC) indicate similar annual potential savings in the three locations (∼190 kWh/m2/year) although estimated CO2 emissions reduction differ reflecting electricity generation fuels. Aging of the cool roof has an impact reducing load savings by 22-26 kWh/m2/year.
Maria Kolokotroni; Emmanuel Shittu; Thiago Santos; Lukasz Ramowski; Adeline Mollard; Kirkland Rowe; Earle Wilson; João Pereira De Brito Filho; Divine Novieto. Cool roofs: High tech low cost solution for energy efficiency and thermal comfort in low rise low income houses in high solar radiation countries. Energy and Buildings 2018, 176, 58 -70.
AMA StyleMaria Kolokotroni, Emmanuel Shittu, Thiago Santos, Lukasz Ramowski, Adeline Mollard, Kirkland Rowe, Earle Wilson, João Pereira De Brito Filho, Divine Novieto. Cool roofs: High tech low cost solution for energy efficiency and thermal comfort in low rise low income houses in high solar radiation countries. Energy and Buildings. 2018; 176 ():58-70.
Chicago/Turabian StyleMaria Kolokotroni; Emmanuel Shittu; Thiago Santos; Lukasz Ramowski; Adeline Mollard; Kirkland Rowe; Earle Wilson; João Pereira De Brito Filho; Divine Novieto. 2018. "Cool roofs: High tech low cost solution for energy efficiency and thermal comfort in low rise low income houses in high solar radiation countries." Energy and Buildings 176, no. : 58-70.