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Paulina Godfrey
Energy and Environment, Engineering Operations EMEA, Hilton, Watford WD24 4QQ, UK

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Journal article
Published: 07 July 2021 in Sustainability
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In light of the recent launch of the Minimum Energy Efficiency Standard targeting the energy performance of commercial buildings, this study compares the energy performance certificates of three UK hotels generated by two different software, EDSL TAS and SBEM, both accredited by the UK government for the purpose. Upon finding the results discrepant, the study finds that the two software’s different assumptions for the air permeability rate contribute to the discrepancy. While modifying this value makes the results from the two software more aligned, further issues regarding the validation process arise. The study continues to find that the underlying issue can be found within the National Calculation Methodology’s assumption about domestic hot water consumption in hotels. These assumptions are compulsory to follow when generating a non-domestic energy performance certificate in the UK, therefore, any uncertainties within them can affect all the buildings seeking an energy performance certificate within that sector. Finally, the study discusses that, for meeting the carbon dioxide mitigation goals, it is necessary to make changes to the current procedure of energy performance certificate generating in the UK to increase its reliability.

ACS Style

Shiva Amirkhani; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook; Hooman Tahayori; Hexin Zhang. Uncertainties in Non-Domestic Energy Performance Certificate Generating in the UK. Sustainability 2021, 13, 7607 .

AMA Style

Shiva Amirkhani, Ali Bahadori-Jahromi, Anastasia Mylona, Paulina Godfrey, Darren Cook, Hooman Tahayori, Hexin Zhang. Uncertainties in Non-Domestic Energy Performance Certificate Generating in the UK. Sustainability. 2021; 13 (14):7607.

Chicago/Turabian Style

Shiva Amirkhani; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook; Hooman Tahayori; Hexin Zhang. 2021. "Uncertainties in Non-Domestic Energy Performance Certificate Generating in the UK." Sustainability 13, no. 14: 7607.

Journal article
Published: 06 May 2020 in Energies
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This paper focuses on Hilton’s proprietary sustainability performance measurement system (SPMS) called LightStay (2010–2017). It draws on the case-study method and relies on three principal sources of information: in-house documents, a questionnaire completed by users of LightStay and interviews conducted with external experts. Specifically, the paper traces the system’s evolution and highlights its distinctive features, exploring the challenges and trade-offs related to the design and workings of an SPMS in a hotel multinational. The study shows, among other things, how LightStay, using an internationally approved methodology of data collection, calculation, metrics and benchmarking, compares a hotel’s predicted and actual environmental performance. It concludes by arguing that LightStay is a holistic platform that not only integrates precise measurement of the firm’s environmental effects with its business operations and strategic goals but also acts as a repository of sustainability knowledge and a facilitator of organisational learning. Its value and originality lie in providing unique insights into the workings of a proprietary SPMS at a nonanonymised hotel company.

ACS Style

Piotr Zientara; Paulina Bohdanowicz-Godfrey; Claire Whitely; Grzegorz Maciejewski. A Case Study of LightStay (2010–2017)—Hilton’s Corporate Responsibility Management System. Energies 2020, 13, 2303 .

AMA Style

Piotr Zientara, Paulina Bohdanowicz-Godfrey, Claire Whitely, Grzegorz Maciejewski. A Case Study of LightStay (2010–2017)—Hilton’s Corporate Responsibility Management System. Energies. 2020; 13 (9):2303.

Chicago/Turabian Style

Piotr Zientara; Paulina Bohdanowicz-Godfrey; Claire Whitely; Grzegorz Maciejewski. 2020. "A Case Study of LightStay (2010–2017)—Hilton’s Corporate Responsibility Management System." Energies 13, no. 9: 2303.

Journal article
Published: 07 April 2020 in Sustainability
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In light of the recent launch of the Minimum Energy Efficiency Standard and its expected impact on the commercial buildings sector, this study investigated the impact of adding cooling systems on the annual energy consumption, carbon dioxide emissions and energy performance certificate (EPC) rating of an existing UK hotel. Thermal Analysis Software (TAS) was used to conduct the study, and the baseline model was validated against the actual data. As is the current accepted procedure in EPC generating in the UK, the cooling set points of the guest rooms were set to 25 °C, resulting in a small increase in the annual energy consumption and emission rates, but not enough to change the energy performance certificate rating. Also, it was found that an improvement in energy consumption and energy performance certificate rating of the hotel would be achieved if the new systems replaced the existing heating systems in the guest rooms. Further simulations investigated more realistic situations, in which occupants may decide to keep their rooms at cooler temperatures. The results from this round of simulations showed considerable increase in the energy consumption and emissions of the building; however, these results would not be considered in the current approved procedure for EPC generating.

ACS Style

Shiva Amirkhani; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. Impact of Adding Comfort Cooling Systems on the Energy Consumption and EPC Rating of an Existing UK Hotel. Sustainability 2020, 12, 2950 .

AMA Style

Shiva Amirkhani, Ali Bahadori-Jahromi, Anastasia Mylona, Paulina Godfrey, Darren Cook. Impact of Adding Comfort Cooling Systems on the Energy Consumption and EPC Rating of an Existing UK Hotel. Sustainability. 2020; 12 (7):2950.

Chicago/Turabian Style

Shiva Amirkhani; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. 2020. "Impact of Adding Comfort Cooling Systems on the Energy Consumption and EPC Rating of an Existing UK Hotel." Sustainability 12, no. 7: 2950.

Journal article
Published: 07 August 2019 in Sustainability
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In order to fulfil the UK government’s ambitious goal of 80% reductions in greenhouse gas emissions by 2050 compared to the levels of 1990s, unprecedented measures for improving the energy efficiency of buildings are needed. This study investigates the impact of a specific type of Low-emissivity (Low-E) window film—Thinsulate Climate Control 75—on the holistic energy consumption of an existing United Kingdom (UK) hotel building. Building modelling and energy simulation software EDSL TAS is used to conduct the study. The result of the simulations demonstrates that by applying Thinsulate films, savings in heating, cooling, and total energy consumptions are achieved by 3%, 20%, and 2.7%, respectively. Also 4.1% and 5.1% savings are achieved in annual CO2 emissions and total energy costs, respectively, while the initial costs may be an issue. This study found that application of Low-E window films results in slightly better energy performance of the hotel regarding its heating-dominant climate. The study also recommends using average annual actual energy consumption data for a time range, instead of picking a single year’s data for validating purposes.

ACS Style

Shiva Amirkhani; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. Impact of Low-E Window Films on Energy Consumption and CO2 Emissions of an Existing UK Hotel Building. Sustainability 2019, 11, 4265 .

AMA Style

Shiva Amirkhani, Ali Bahadori-Jahromi, Anastasia Mylona, Paulina Godfrey, Darren Cook. Impact of Low-E Window Films on Energy Consumption and CO2 Emissions of an Existing UK Hotel Building. Sustainability. 2019; 11 (16):4265.

Chicago/Turabian Style

Shiva Amirkhani; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. 2019. "Impact of Low-E Window Films on Energy Consumption and CO2 Emissions of an Existing UK Hotel Building." Sustainability 11, no. 16: 4265.

Journal article
Published: 15 June 2018 in Sustainability
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Several studies have highlighted Combine Heat and Power (CHP) systems to be one of the proven and reliable technologies that can improve the efficiency of heat and electricity generation. The extensive adoption of this type of technology is crucial in reducing building emissions globally and in the U.K. This work uses a dynamic simulation software to evaluate the effect of CHP on the energy performance of an existing U.K. hotel and subsequently an approach to aid in the selection of optimum CHP size. The outcome of the study indicated that CHP systems in hotel buildings can provide considerable economic and environmental benefits with either maximally-sized CHP founded on the building’s base heat demand or with reduced CHP size of more than 50% smaller than the estimated maximum size. The optimum size design can be obtained through evaluation of the relationship between the main performance parameters and their variation with CHP sizes.

ACS Style

Abdulazeez Rotimi; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. Optimum Size Selection of CHP Retrofitting in Existing UK Hotel Building. Sustainability 2018, 10, 2044 .

AMA Style

Abdulazeez Rotimi, Ali Bahadori-Jahromi, Anastasia Mylona, Paulina Godfrey, Darren Cook. Optimum Size Selection of CHP Retrofitting in Existing UK Hotel Building. Sustainability. 2018; 10 (6):2044.

Chicago/Turabian Style

Abdulazeez Rotimi; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. 2018. "Optimum Size Selection of CHP Retrofitting in Existing UK Hotel Building." Sustainability 10, no. 6: 2044.

Journal article
Published: 10 May 2018 in Energies
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In recent years there has been an increasing interest in the incorporation of distributed energy resource (DER) systems such as combined heat and power (CHP) and combined cooling, heating, and power (CCHP) in commercial building applications as they have shown considerable environmental and financial benefits when compared to conventional energy generation. This paper aims to investigate the potential energy, carbon emissions, and financial impact of the size of co/tri-generation systems on a real case scenario of an existing UK hotel. The analysis is carried out using Thermal Analysis Simulation software (TAS) and a payback methodology is adopted to carry out the financial analysis. The results show that the average percentage decrease in carbon emissions with CHP is 32% and with CCHP it is 36%. Whilst both CHP and CCHP systems increase energy consumption in the building, the costs are reduced, and a CHP system contributes to a higher percentage of cost savings and shorter payback periods. The incorporation of a CCHP system leads to lower energy consumption for a similar-sized CHP system. Further simulations under future climate projections revealed that a CCHP system outperforms a CHP system.

ACS Style

Radwa Salem; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. Comparison and Evaluation of the Potential Energy, Carbon Emissions, and Financial Impacts from the Incorporation of CHP and CCHP Systems in Existing UK Hotel Buildings. Energies 2018, 11, 1219 .

AMA Style

Radwa Salem, Ali Bahadori-Jahromi, Anastasia Mylona, Paulina Godfrey, Darren Cook. Comparison and Evaluation of the Potential Energy, Carbon Emissions, and Financial Impacts from the Incorporation of CHP and CCHP Systems in Existing UK Hotel Buildings. Energies. 2018; 11 (5):1219.

Chicago/Turabian Style

Radwa Salem; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. 2018. "Comparison and Evaluation of the Potential Energy, Carbon Emissions, and Financial Impacts from the Incorporation of CHP and CCHP Systems in Existing UK Hotel Buildings." Energies 11, no. 5: 1219.

Journal article
Published: 07 August 2017 in Sustainability
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Adverse effects of anthropogenic climate change has resulted in mitigation strategies geared towards curbing CO2 emissions. Consequently, this has increased demand for more energy efficient buildings. Considerable amounts of studies have shown the existence of a significant discrepancy between estimated energy consumption by thermal simulation software and actual building operational energy; this is referred to as a ‘performance gap’. This work presents a method of improving the energy consumption estimate in an existing non-domestic building via the use of a case study UK hotel (Hilton Reading Hotel) and Engineering Development Solutions limited (EDSL) TAS thermal simulation software. The method involves evaluating consumption estimates through plant modelling, and modifying this result by surveying the site to verify the simulation data and including estimates of unaccounted building energy use such as catering services which can be significant in hotels. The energy consumption result for this case study building gives an estimate which is within 12% of the actual building consumption data. The result also demonstrated that such models can produce energy consumption estimates that are up to 23% more accurate than building regulation compliance models and that more accurate simulation consumption estimates can be achieved by accounting for more unregulated energy uses, for example, lifts, servers and small power load.

ACS Style

Abdulazeez Rotimi; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. Estimation and Validation of Energy Consumption in UK Existing Hotel Building Using Dynamic Simulation Software. Sustainability 2017, 9, 1391 .

AMA Style

Abdulazeez Rotimi, Ali Bahadori-Jahromi, Anastasia Mylona, Paulina Godfrey, Darren Cook. Estimation and Validation of Energy Consumption in UK Existing Hotel Building Using Dynamic Simulation Software. Sustainability. 2017; 9 (8):1391.

Chicago/Turabian Style

Abdulazeez Rotimi; Ali Bahadori-Jahromi; Anastasia Mylona; Paulina Godfrey; Darren Cook. 2017. "Estimation and Validation of Energy Consumption in UK Existing Hotel Building Using Dynamic Simulation Software." Sustainability 9, no. 8: 1391.

Journal article
Published: 02 May 2017 in Sustainability
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Recently, considerable attention has justifiably been directed towards energy savings in buildings as they account for up to 20–40% of total energy consumption in developed countries. In the United Kingdom, studies have revealed that buildings’ CO2 emissions for account for at least 43% of total emissions. Window panels are a major component of the building fabric with considerable influence on the façade energy performance and are accountable for up to 60% of a building’s overall energy loss. Therefore, the thermal performance of glazing materials is an important issue within the built environment. This work evaluates the impact of solar window films on the overall energy consumption of an existing commercial building via the use of a case study U.K. hotel and TAS dynamic simulation software. The study results demonstrated that the impact of window films on the overall energy consumption of the case study hotel is approximately 2%. However, an evaluation of various overall energy consumption components showed that the window films reduce the annual total cooling energy consumption by up to 35% along with a marginal 2% increase in the annual total heating energy consumption. They can also provide overall cost and CO2 emissions savings of up to 3%.

ACS Style

Ali Bahadori-Jahromi; Abdulazeez Rotimi; Anastasia Mylona; Paulina Godfrey; Darren Cook. Impact of Window Films on the Overall Energy Consumption of Existing UK Hotel Buildings. Sustainability 2017, 9, 731 .

AMA Style

Ali Bahadori-Jahromi, Abdulazeez Rotimi, Anastasia Mylona, Paulina Godfrey, Darren Cook. Impact of Window Films on the Overall Energy Consumption of Existing UK Hotel Buildings. Sustainability. 2017; 9 (5):731.

Chicago/Turabian Style

Ali Bahadori-Jahromi; Abdulazeez Rotimi; Anastasia Mylona; Paulina Godfrey; Darren Cook. 2017. "Impact of Window Films on the Overall Energy Consumption of Existing UK Hotel Buildings." Sustainability 9, no. 5: 731.