Pub Date : 2023-12-21DOI: 10.1080/17512549.2023.2295296
Sahar Ben Romdhane, Amani Amamou, Hammouda Mahjoub, N. M. Said, Abdelmajid Jemni, Z. Younsi
{"title":"Numerical study on thermal performance of a building design integrating two passive Trombe walls","authors":"Sahar Ben Romdhane, Amani Amamou, Hammouda Mahjoub, N. M. Said, Abdelmajid Jemni, Z. Younsi","doi":"10.1080/17512549.2023.2295296","DOIUrl":"https://doi.org/10.1080/17512549.2023.2295296","url":null,"abstract":"","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"25 23","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139166106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-08DOI: 10.1080/17512549.2023.2290529
S. Monika, Bhanu M. Marwaha
{"title":"Impact of courtyard on indoor thermal environment in vernacular row houses of warm and humid climate: case study of Kanyakumari, Tamil Nadu","authors":"S. Monika, Bhanu M. Marwaha","doi":"10.1080/17512549.2023.2290529","DOIUrl":"https://doi.org/10.1080/17512549.2023.2290529","url":null,"abstract":"","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"20 5","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138589790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1080/17512549.2023.2286981
Younes Bahammou, Oumayma Babaharra, M. Kouhila, Z. Tagnamas, H. Lamsyehe, A. Lamharrar, Raja Idlimam
{"title":"Capillary sorption, thermo physical characterizations and simulation study of an eco-friendly building material reinforced with Chamarrops humilis fibres","authors":"Younes Bahammou, Oumayma Babaharra, M. Kouhila, Z. Tagnamas, H. Lamsyehe, A. Lamharrar, Raja Idlimam","doi":"10.1080/17512549.2023.2286981","DOIUrl":"https://doi.org/10.1080/17512549.2023.2286981","url":null,"abstract":"","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"17 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139214393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-17DOI: 10.1080/17512549.2023.2270543
Ruiliang Yang, Libin Yang, Jin Wei
ABSTRACTThe ambient summer temperature within the spinning workshop consistently exceeds the upper limit of the comfort zone. This study aims to assess individuals’ thermal responses under various high-temperature combinations resembling those encountered in the spinning workshop. Forty students were recruited as participants and exposed to 112 state points within a controlled climate chamber. These conditions encompassed diverse high-temperature combinations, comprising four temperature levels (29 °C, 32 °C, 35 °C, and 40 °C), seven humidity levels (30%, 40%, 50%, 55%, 60%, 65%, and 70%), and four air velocity levels (0, 0.1, 0.3, and 0.5 m/s). Participants donned single-layer clothing with a thermal resistance of 0.6 clo, and their subjective evaluations were collected via questionnaires. The study confirms that the GB/T 50481 guidelines for workshop temperature appear to be reasonable, considering the low thermal expectation and adaptation of workers. However, nearly 100% of the participants deemed temperatures surpassing 38 °Cwithin the spinning workshop as unacceptable, with approximately 80% of participants categorizing it as distinctly unacceptable. Consequently, it is recommended that the GB/T 50481 standards be extended to explicitly declare temperatures above 38 °C within the spinning workshop as unacceptable. This study lays a robust foundation for forthcoming research concerning high-temperature conditions within spinning workshops.KEYWORDS: Spinning workshoppredicted mean vote (PMV)thermal sensation vote (TSV)thermal comfort vote (TCV)thermal acceptability vote (TAV) Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingWe would like to thank China National Textile and Apparel Council (No. 2021053).
{"title":"Research on the thermal environment in a climate chamber with different high-temperature combinations","authors":"Ruiliang Yang, Libin Yang, Jin Wei","doi":"10.1080/17512549.2023.2270543","DOIUrl":"https://doi.org/10.1080/17512549.2023.2270543","url":null,"abstract":"ABSTRACTThe ambient summer temperature within the spinning workshop consistently exceeds the upper limit of the comfort zone. This study aims to assess individuals’ thermal responses under various high-temperature combinations resembling those encountered in the spinning workshop. Forty students were recruited as participants and exposed to 112 state points within a controlled climate chamber. These conditions encompassed diverse high-temperature combinations, comprising four temperature levels (29 °C, 32 °C, 35 °C, and 40 °C), seven humidity levels (30%, 40%, 50%, 55%, 60%, 65%, and 70%), and four air velocity levels (0, 0.1, 0.3, and 0.5 m/s). Participants donned single-layer clothing with a thermal resistance of 0.6 clo, and their subjective evaluations were collected via questionnaires. The study confirms that the GB/T 50481 guidelines for workshop temperature appear to be reasonable, considering the low thermal expectation and adaptation of workers. However, nearly 100% of the participants deemed temperatures surpassing 38 °Cwithin the spinning workshop as unacceptable, with approximately 80% of participants categorizing it as distinctly unacceptable. Consequently, it is recommended that the GB/T 50481 standards be extended to explicitly declare temperatures above 38 °C within the spinning workshop as unacceptable. This study lays a robust foundation for forthcoming research concerning high-temperature conditions within spinning workshops.KEYWORDS: Spinning workshoppredicted mean vote (PMV)thermal sensation vote (TSV)thermal comfort vote (TCV)thermal acceptability vote (TAV) Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingWe would like to thank China National Textile and Apparel Council (No. 2021053).","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136033556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-17DOI: 10.1080/17512549.2023.2269925
Arman Ameen, Mathias Cehlin, Taghi Karimipanah
This study investigates the feasibility of using only corner impinging jet ventilation (CIJV) for heating and cooling a medium-sized office space with two occupants while maintaining adequate indoor thermal comfort and air quality compared to traditional mixing ventilation systems. This study examines what impact various outdoor temperatures, ranging from −15°C to 25°C, have on an office environment in terms of indoor thermal comfort and air quality. Three different workspace positions were evaluated. The results show that the CIJV system meets the ASHRAE thermal comfort standards for all three positions. In terms of indoor air quality, CIJV performs better than traditional mixing systems, with improved mean age of air and ACE values. This study concludes that CIJV can be used both close and far away from the supply inlets and still provide adequate indoor thermal comfort and air quality during both cooling and heating season.
{"title":"Numerical investigation of indoor thermal comfort and air quality for an office equipped with corner impinging jet ventilation","authors":"Arman Ameen, Mathias Cehlin, Taghi Karimipanah","doi":"10.1080/17512549.2023.2269925","DOIUrl":"https://doi.org/10.1080/17512549.2023.2269925","url":null,"abstract":"This study investigates the feasibility of using only corner impinging jet ventilation (CIJV) for heating and cooling a medium-sized office space with two occupants while maintaining adequate indoor thermal comfort and air quality compared to traditional mixing ventilation systems. This study examines what impact various outdoor temperatures, ranging from −15°C to 25°C, have on an office environment in terms of indoor thermal comfort and air quality. Three different workspace positions were evaluated. The results show that the CIJV system meets the ASHRAE thermal comfort standards for all three positions. In terms of indoor air quality, CIJV performs better than traditional mixing systems, with improved mean age of air and ACE values. This study concludes that CIJV can be used both close and far away from the supply inlets and still provide adequate indoor thermal comfort and air quality during both cooling and heating season.","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135994417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-11DOI: 10.1080/17512549.2023.2266464
N. Del Regno, A. Gigante, S. Ruggiero, F. Tariello, G. P. Vanoli
ABSTRACTThe characteristics of health facilities e.g. the need to operate 24 h a day, strict cleaning procedures and indoor environmental parameters made these building-type energy-intensive. The huge potential that can be exploited in terms of energy savings is evident, mainly regarding the HVAC system refurbishment. From literature emerges that there are poor systematic analyses concerning all the possible HVAC retrofit scenarios, considering solutions currently on the market or renewable sources. To fill the research gap pointed out, the present paper proposes a rigorous analysis of the possible generation subsystems available on the market that can be implemented in an HVAC retrofit for a hospital. A real case study of 88,000 m3, represented by a hospital in southern Italy, has been used. Different technologies, such as the photovoltaic system, electric heat pump, absorption heat pump driven by solar energy, cogeneration are analysed from the energy and environmental point of view, with the introduction of the Imported Energy Level Index (IELI). The best retrofit measures is the installation of an absorption heat pump driven by solar thermal collectors and cogeneration, with a primary energy saving of 20%. Considering the installation of a heat recovery unit, the saving is up to 43%.KEYWORDS: Energy savingHVAC hospital building refurbishmentcarbon dioxide emission reductionrenewable sourcesImported Energy Level Index NomenclatureCO2=Carbon dioxide emission [kgCO2/y]E=Energy [GWh/y]IELI=Imported Energy Level Index [%]PES=Primary Energy Saving [%] Greek symbolsα=Emission factor for electricity generation [gCO2/kWhel]β=Emission factors for natural gas [kgCO2/kWhEp]η=Efficiency [-], [%]Δ=Percent variation with respect to base case [%] SuperscriptAHP=Absorption Heat PumpAHU=Air Handling UnitB=BoilerBMS=Building Management SystemBS=Base CaseCHP=Combined Heat and PowerDHW=Domestic Hot WaterEHP=Electric Heat PumpE-L=Electric LoadsFC=Fan-coilfg=fed into the gridHWST=Hot Water Storage TankISPRA=Istituto Superiore per la Protezione e la Ricerca AmbientalePAC=Proposed Alternative CasePP=Power PlantPV=Photovoltaic systemR=RadiatorsSTC=Solar Thermal Collectorsuos=Used on-site Subscriptco=Coolingel=Electricp=Primary energyth=Thermal AcronymsAHP=Absorption Heat PumpAHU=Air Handling UnitB=BoilerBS=Base CaseCHP=Combined Heat and PowerDHW=Domestic Hot WaterEHP=Electric Heat PumpFC=Fan-coilHWST=Hot Water Storage TankPP=Power PlantPV=Photovoltaic systemR=RadiatorsSTC=Solar Thermal CollectorsVFD=Variable Frequency DriveVP=Variable PitchDisclosure statementNo potential conflict of interest was reported by the author(s).
摘要卫生设施的特点，如需要24小时运行，严格的清洁程序和室内环境参数，使这些建筑类型的能源密集型。在节能方面可以开发的巨大潜力是显而易见的，主要是在暖通空调系统翻新方面。从文献中可以看出，考虑到目前市场上的解决方案或可再生能源，对所有可能的暖通空调改造方案的系统分析很差。为了填补所指出的研究空白，本文建议对市场上可用于医院暖通空调改造的可能的发电子系统进行严格分析。以意大利南部一家医院为代表的88,000立方米的真实案例研究已经被使用。引入进口能源水平指数(IELI)，从能源和环境的角度分析了不同的技术，如光伏系统、电热泵、太阳能驱动的吸收式热泵、热电联产。最好的改造措施是安装由太阳能集热器和热电联产驱动的吸收式热泵，一次节能20%。考虑到安装热回收装置，节省高达43%。关键词:节能hvac医院建筑改造二氧化碳减排可再生能源进口能源水平指数命名法reco2 =二氧化碳排放量[kgCO2/y]E=能源[GWh/y]IELI=进口能源水平指数[%]PES=初级节能[%]希腊符号α=发电排放系数[gCO2/kWhel]β=天然气排放系数[kgCO2/kWhEp]η=效率[-]，[%]Δ=相对于基本情况的变化百分比[%]SuperscriptAHP=吸收式热泵pahu =空气处理机组b =锅炉erbms =建筑管理系统bs =基本情况echp =热电联产dhw =生活热水ehp =电热泵- l =电负荷sfc =风机盘管=馈入电网dhwst =热水储存罐pra =高等研究所(Istituto Superiore per la Protezione e la Ricerca AmbientalePAC=建议替代方案CasePP=发电厂pv =光伏系统r =散热器stc =太阳能集热器suos=现场使用Subscriptco=Coolingel=Electricp=Primary energth =Thermal首字缩写sahp =吸收式热泵pahu =空气处理机组b =锅炉bs =基础箱echp =热电联产dhw =家用热水ehp =电热泵fc =风机盘管hwst =热储水箱kpp =发电厂pv =光伏系统r =散热器stc =太阳能集热器svfd =变频驱动evp =变节差披露声明作者未报告潜在的利益冲突。
{"title":"Energy efficiency in hospitals: comparative analysis of different HVAC configurations","authors":"N. Del Regno, A. Gigante, S. Ruggiero, F. Tariello, G. P. Vanoli","doi":"10.1080/17512549.2023.2266464","DOIUrl":"https://doi.org/10.1080/17512549.2023.2266464","url":null,"abstract":"ABSTRACTThe characteristics of health facilities e.g. the need to operate 24 h a day, strict cleaning procedures and indoor environmental parameters made these building-type energy-intensive. The huge potential that can be exploited in terms of energy savings is evident, mainly regarding the HVAC system refurbishment. From literature emerges that there are poor systematic analyses concerning all the possible HVAC retrofit scenarios, considering solutions currently on the market or renewable sources. To fill the research gap pointed out, the present paper proposes a rigorous analysis of the possible generation subsystems available on the market that can be implemented in an HVAC retrofit for a hospital. A real case study of 88,000 m3, represented by a hospital in southern Italy, has been used. Different technologies, such as the photovoltaic system, electric heat pump, absorption heat pump driven by solar energy, cogeneration are analysed from the energy and environmental point of view, with the introduction of the Imported Energy Level Index (IELI). The best retrofit measures is the installation of an absorption heat pump driven by solar thermal collectors and cogeneration, with a primary energy saving of 20%. Considering the installation of a heat recovery unit, the saving is up to 43%.KEYWORDS: Energy savingHVAC hospital building refurbishmentcarbon dioxide emission reductionrenewable sourcesImported Energy Level Index NomenclatureCO2=Carbon dioxide emission [kgCO2/y]E=Energy [GWh/y]IELI=Imported Energy Level Index [%]PES=Primary Energy Saving [%] Greek symbolsα=Emission factor for electricity generation [gCO2/kWhel]β=Emission factors for natural gas [kgCO2/kWhEp]η=Efficiency [-], [%]Δ=Percent variation with respect to base case [%] SuperscriptAHP=Absorption Heat PumpAHU=Air Handling UnitB=BoilerBMS=Building Management SystemBS=Base CaseCHP=Combined Heat and PowerDHW=Domestic Hot WaterEHP=Electric Heat PumpE-L=Electric LoadsFC=Fan-coilfg=fed into the gridHWST=Hot Water Storage TankISPRA=Istituto Superiore per la Protezione e la Ricerca AmbientalePAC=Proposed Alternative CasePP=Power PlantPV=Photovoltaic systemR=RadiatorsSTC=Solar Thermal Collectorsuos=Used on-site Subscriptco=Coolingel=Electricp=Primary energyth=Thermal AcronymsAHP=Absorption Heat PumpAHU=Air Handling UnitB=BoilerBS=Base CaseCHP=Combined Heat and PowerDHW=Domestic Hot WaterEHP=Electric Heat PumpFC=Fan-coilHWST=Hot Water Storage TankPP=Power PlantPV=Photovoltaic systemR=RadiatorsSTC=Solar Thermal CollectorsVFD=Variable Frequency DriveVP=Variable PitchDisclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136210596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACTElectrical energy usage of commercial buildings (over 60% in the USA) is of growing concern due to its impact on the environment. To reduce it, it is necessary to identify the factors contributing to commercial building energy usage. Towards this, we studied the importance of various building features and their contributions on cooling energy, using two datasets of Commercial Building Energy Consumption Survey (CBECS) 2018 and 2012. For this, Shapash, an explainable artificial intelligence technique, was used, with Random Forest, to predict the cooling energy usage intensity (EUI). The two most important features for 2018 are cooling degree days and principal building activity, while cooling degree days and cooling percentage were for 2012 with 54.79% and 33.46% contributions of the total consumption respectively. The comparison of feature importance indicated that cooling degree days are the topmost important feature impacting cooling EUI and have a more significant contribution of 34.29% for 2018 and 19.68% for 2012. Overall, the most important features impacting cooling EUI were cooling degree days, principle building activity, cooling percentage and total hours open per week. The results from this study provide insights into the most significant factors influencing energy consumption and help in developing strategies for reducing it.KEYWORDS: Explainable artificial intelligence (XAI)Shapashcooling energy usageenergy efficiencyrandom forestCBECSfeature importance Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Identifying salient features of cooling energy usage of commercial buildings using explainable artificial intelligence","authors":"Lakmini Rangana Senarathne, Gaurav Nanda, Raji Sundararajan","doi":"10.1080/17512549.2023.2261020","DOIUrl":"https://doi.org/10.1080/17512549.2023.2261020","url":null,"abstract":"ABSTRACTElectrical energy usage of commercial buildings (over 60% in the USA) is of growing concern due to its impact on the environment. To reduce it, it is necessary to identify the factors contributing to commercial building energy usage. Towards this, we studied the importance of various building features and their contributions on cooling energy, using two datasets of Commercial Building Energy Consumption Survey (CBECS) 2018 and 2012. For this, Shapash, an explainable artificial intelligence technique, was used, with Random Forest, to predict the cooling energy usage intensity (EUI). The two most important features for 2018 are cooling degree days and principal building activity, while cooling degree days and cooling percentage were for 2012 with 54.79% and 33.46% contributions of the total consumption respectively. The comparison of feature importance indicated that cooling degree days are the topmost important feature impacting cooling EUI and have a more significant contribution of 34.29% for 2018 and 19.68% for 2012. Overall, the most important features impacting cooling EUI were cooling degree days, principle building activity, cooling percentage and total hours open per week. The results from this study provide insights into the most significant factors influencing energy consumption and help in developing strategies for reducing it.KEYWORDS: Explainable artificial intelligence (XAI)Shapashcooling energy usageenergy efficiencyrandom forestCBECSfeature importance Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136295345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACTThe current investigation examines the experimental and energy-conservation analyses of 17.5 kW cooling capacity of a ground-source heat pump (GSHP) system and an air-source air-conditioning system (ASAC) of the same cooling capacity. Using experimental data and a sensitivity technique, the thermal efficiency of both the systems were evaluated. During the experiments conducted for cooling period in June 2022, the data for six-day operation were collected and the coefficient of performance of both the systems were evaluated. Notably, the GSHP system exhibited an average cooling capacity of 10 to 15 kW, whereas the ASAC maintained a range of 9 and 13 kW. The coefficient of performance (COP) for the GSHP system was obtained as 3.8, while the ASAC system COP was 2.9. The results indicate that the use of GSHP system results in an energy-saving of 10–40% in comparison to the ASAC system. Moreover, the present study included uncertainty and propagation analyses, along with sensitivity evaluations, with the objective of identifying the most influencing parameter on the derived parameters. Sensitivity analysis indicates outlet temperature of air from the evaporator is the most influencing parameter for the performance of both the systems.KEYWORDS: Ground-source heat pumpair-source air-conditioning systemenergy-savingsuncertainty and sensitivity analysiscooling mode operation AcknowledgementsThe experimental facilities for this research were provided by the Department of Architecture and Planning at IIT Roorkee supported by the Engineering and Physics Science Research Council (EPSRC) of the United Kingdom (EP/R00861) and the Government of India (ZED-i). The author would like to express gratitude for the assistantship provided by the Ministry of Human Resources and Development, India, as well as the National Institute of Hydrology in Roorkee for supplying the weather data necessary for this research project.Credit authorship contributionShammy Kumar Sah: Data interpretation, Writing-manuscript, Writing-review and editing, Numerical analysis, Methodology, Validation. Krishnan Murugesan: Supervision, Writing-review and editing. Elangovan Rajasekar: Supervision, Writing-review and editing.Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Experimental and energy saving potential analysis of GSHP and ASAC systems using normalized sensitivity technique in cooling mode operation","authors":"Shammy Kumar Sah, Murugesan Krishnan, Rajasekar Elangovan","doi":"10.1080/17512549.2023.2263457","DOIUrl":"https://doi.org/10.1080/17512549.2023.2263457","url":null,"abstract":"ABSTRACTThe current investigation examines the experimental and energy-conservation analyses of 17.5 kW cooling capacity of a ground-source heat pump (GSHP) system and an air-source air-conditioning system (ASAC) of the same cooling capacity. Using experimental data and a sensitivity technique, the thermal efficiency of both the systems were evaluated. During the experiments conducted for cooling period in June 2022, the data for six-day operation were collected and the coefficient of performance of both the systems were evaluated. Notably, the GSHP system exhibited an average cooling capacity of 10 to 15 kW, whereas the ASAC maintained a range of 9 and 13 kW. The coefficient of performance (COP) for the GSHP system was obtained as 3.8, while the ASAC system COP was 2.9. The results indicate that the use of GSHP system results in an energy-saving of 10–40% in comparison to the ASAC system. Moreover, the present study included uncertainty and propagation analyses, along with sensitivity evaluations, with the objective of identifying the most influencing parameter on the derived parameters. Sensitivity analysis indicates outlet temperature of air from the evaporator is the most influencing parameter for the performance of both the systems.KEYWORDS: Ground-source heat pumpair-source air-conditioning systemenergy-savingsuncertainty and sensitivity analysiscooling mode operation AcknowledgementsThe experimental facilities for this research were provided by the Department of Architecture and Planning at IIT Roorkee supported by the Engineering and Physics Science Research Council (EPSRC) of the United Kingdom (EP/R00861) and the Government of India (ZED-i). The author would like to express gratitude for the assistantship provided by the Ministry of Human Resources and Development, India, as well as the National Institute of Hydrology in Roorkee for supplying the weather data necessary for this research project.Credit authorship contributionShammy Kumar Sah: Data interpretation, Writing-manuscript, Writing-review and editing, Numerical analysis, Methodology, Validation. Krishnan Murugesan: Supervision, Writing-review and editing. Elangovan Rajasekar: Supervision, Writing-review and editing.Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135345426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACTNatural ventilation is one of the main passive ways to reduce energy needs by delivering fresh air into the building without the help of mechanical systems. In this perspective, using the water bath model and particle image velocimetry, an experimental study of the relationship between fluid velocity caused by buoyancy-driven natural ventilation in a building with single-sided and cross ventilation has been conducted. A case study building with a jointed atrium has been considered for the six initial conditions tests. In the test model which has two low-level inlet openings, fluid velocity in single-sided ventilation mode was meaningfully higher than in cross-ventilation mode, ranging from 18% to 32%. In contrast, by changing the position of the windows to higher levels, cross ventilation creates a flow with 28% higher velocity. Analyzing velocity data demonstrates that, in all tests, the air change rate caused by buoyancy force in cross ventilation mode is more than in single-sided one. Furthermore, in the tests with two high-level openings acting as outlet openings, by opening both sides’ windows in the building, the air change rate increases significantly by 71.75%.KEYWORDS: Buoyancy-driven natural ventilationwater bath modelparticle image velocimetryatriumair change rate Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Experimental investigation of buoyancy-driven natural ventilation in a building with an atrium using particle image velocimetry (PIV) method","authors":"Mitra Bagheri, Danyal Ghanbari Barfeh, Maryam Karami, Shahram Delfani, Mohamadreza Hafezi","doi":"10.1080/17512549.2023.2263459","DOIUrl":"https://doi.org/10.1080/17512549.2023.2263459","url":null,"abstract":"ABSTRACTNatural ventilation is one of the main passive ways to reduce energy needs by delivering fresh air into the building without the help of mechanical systems. In this perspective, using the water bath model and particle image velocimetry, an experimental study of the relationship between fluid velocity caused by buoyancy-driven natural ventilation in a building with single-sided and cross ventilation has been conducted. A case study building with a jointed atrium has been considered for the six initial conditions tests. In the test model which has two low-level inlet openings, fluid velocity in single-sided ventilation mode was meaningfully higher than in cross-ventilation mode, ranging from 18% to 32%. In contrast, by changing the position of the windows to higher levels, cross ventilation creates a flow with 28% higher velocity. Analyzing velocity data demonstrates that, in all tests, the air change rate caused by buoyancy force in cross ventilation mode is more than in single-sided one. Furthermore, in the tests with two high-level openings acting as outlet openings, by opening both sides’ windows in the building, the air change rate increases significantly by 71.75%.KEYWORDS: Buoyancy-driven natural ventilationwater bath modelparticle image velocimetryatriumair change rate Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136279611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACTClimate chamber-based studies provide a baseline for quantifying thermal comfort. They can be used to compare real-world thermal adaptation to air temperature (Ta), relative humidity (RH) and air movement (Va). Several adaptive thermal comfort studies in subtropical regional established the role of moisture and air movement is crucial in comfort regulation. However, a baseline study in controlled environments demonstrating the combined effect of multiple environmental variable has yet to be available. In this context, this study presents the results of controlled climate-chamber-based thermal comfort experiments performed with 16 acclimatized subjects. Each subject underwent 140 test conditions covering 20–40°C Ta, 30–70% RH, and 0.25–2.0 m/s Va while performing a sedentary activity, yielding 8360 valid subjective responses. The study yielded a Tn of 29.3°C in terms of Ta, while the comfort temperature varied from 25.7 to 32.9°C (Ta). The effect of RH and Va on thermal sensation, comfort and preferences are established. An empirical reformulation of the Tropical Summer Index with thermal sensation and comfort votes is presented. A comparative analysis of the baseline thermal comfort limits with the adaptive comfort limits established by various field studies in the sub-tropical region is presented. Va requirements for just comfortable and acceptably warm conditions are presented for different Ta and RH set-points.KEYWORDS: Thermal comfortclimate chamber studythermoneutralitythermal preferenceair velocity Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research work is conducted in the Climate Simulator Lab, funded by SMILE, IIT Roorkee [grant number SMILE-100594] received by Prof. Sudhakar Subudhi, and Prof. Rajasekar Elangovan. The instrumentation used in this research is supported by the DST-EPSRC-funded Indo-UK research project on Zero Peak Energy Building Design for India (ZED-I) [grant number DST-1161-APD], received by Prof. Rajasekar Elangovan.
摘要基于气候室的研究为量化热舒适提供了基线。它们可以用来比较真实世界的热适应空气温度(Ta)，相对湿度(RH)和空气运动(Va)。一些亚热带地区的适应性热舒适研究表明，湿度和空气运动在舒适性调节中起着至关重要的作用。然而，在受控环境中进行的基线研究表明，多种环境变量的综合影响尚未得到证实。在此背景下，本研究介绍了对16名适应环境的受试者进行的基于受控气候室的热舒适实验的结果。每位受试者在进行久坐活动时接受了140个测试条件，包括20-40°C温度、30-70% RH和0.25-2.0 m/s Va，产生了8360个有效的主观反应。该研究得出的Tn (Ta)为29.3°C，而舒适温度(Ta)为25.7至32.9°C。确定了RH和Va对热感觉、舒适性和偏好的影响。提出了一种基于热感觉和舒适投票的热带夏季指数的经验公式。对基线热舒适限值与亚热带地区各种实地研究建立的适应性舒适限值进行了比较分析。对于不同的Ta和RH设定点，给出了刚刚舒适和可接受的温暖条件的Va要求。关键词:热舒适气候室研究热中性热偏好风速披露声明作者未报告潜在利益冲突。本研究工作在气候模拟器实验室进行，由SMILE和印度理工学院鲁尔基分校资助[批准号SMILE-100594]，由Sudhakar Subudhi教授和Rajasekar Elangovan教授接受。本研究中使用的仪器由科技部- epsrc资助的印度-英国研究项目“印度零峰值能耗建筑设计”(ZED-I)提供支持[批准号为DST-1161-APD]，由Rajasekar Elangovan教授接收。
{"title":"Establishing thermal comfort baseline in a sub-tropical region through a controlled climate chamber study","authors":"Krishan Upadhyay, Rajasekar Elangovan, Sudhakar Subudhi","doi":"10.1080/17512549.2023.2258884","DOIUrl":"https://doi.org/10.1080/17512549.2023.2258884","url":null,"abstract":"ABSTRACTClimate chamber-based studies provide a baseline for quantifying thermal comfort. They can be used to compare real-world thermal adaptation to air temperature (Ta), relative humidity (RH) and air movement (Va). Several adaptive thermal comfort studies in subtropical regional established the role of moisture and air movement is crucial in comfort regulation. However, a baseline study in controlled environments demonstrating the combined effect of multiple environmental variable has yet to be available. In this context, this study presents the results of controlled climate-chamber-based thermal comfort experiments performed with 16 acclimatized subjects. Each subject underwent 140 test conditions covering 20–40°C Ta, 30–70% RH, and 0.25–2.0 m/s Va while performing a sedentary activity, yielding 8360 valid subjective responses. The study yielded a Tn of 29.3°C in terms of Ta, while the comfort temperature varied from 25.7 to 32.9°C (Ta). The effect of RH and Va on thermal sensation, comfort and preferences are established. An empirical reformulation of the Tropical Summer Index with thermal sensation and comfort votes is presented. A comparative analysis of the baseline thermal comfort limits with the adaptive comfort limits established by various field studies in the sub-tropical region is presented. Va requirements for just comfortable and acceptably warm conditions are presented for different Ta and RH set-points.KEYWORDS: Thermal comfortclimate chamber studythermoneutralitythermal preferenceair velocity Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research work is conducted in the Climate Simulator Lab, funded by SMILE, IIT Roorkee [grant number SMILE-100594] received by Prof. Sudhakar Subudhi, and Prof. Rajasekar Elangovan. The instrumentation used in this research is supported by the DST-EPSRC-funded Indo-UK research project on Zero Peak Energy Building Design for India (ZED-I) [grant number DST-1161-APD], received by Prof. Rajasekar Elangovan.","PeriodicalId":46184,"journal":{"name":"Advances in Building Energy Research","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135814480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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