Pub Date : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398661
R. Verayiah, A. Ramasamy, H. Abidin, I. Musirin
Voltage collapse phenomenon is known to be complex and localized in nature but with a widespread effect. The ultimate effect of voltage collapse would be total system collapse which would incur high losses to utility companies. Thus, on- line monitoring of power system stability has become a vital factor for electric utility companies. One of the methods to avoid voltage collapse is to perform Under Voltage Load Shedding (UVLS). Fast Voltage Stability Index (FVSI) index is proven to be a good indicator for voltage stability in a system. This paper analyzes the correlation between FVSI and the placement of UVLS relays for a 746 test bus system. It is found from the simulations results that FVSI index can be used as an indicator for the placement of UVLS relays in a power system network.
{"title":"Under Voltage Load Shedding (UVLS) study for 746 test bus system","authors":"R. Verayiah, A. Ramasamy, H. Abidin, I. Musirin","doi":"10.1109/ICEENVIRON.2009.5398661","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398661","url":null,"abstract":"Voltage collapse phenomenon is known to be complex and localized in nature but with a widespread effect. The ultimate effect of voltage collapse would be total system collapse which would incur high losses to utility companies. Thus, on- line monitoring of power system stability has become a vital factor for electric utility companies. One of the methods to avoid voltage collapse is to perform Under Voltage Load Shedding (UVLS). Fast Voltage Stability Index (FVSI) index is proven to be a good indicator for voltage stability in a system. This paper analyzes the correlation between FVSI and the placement of UVLS relays for a 746 test bus system. It is found from the simulations results that FVSI index can be used as an indicator for the placement of UVLS relays in a power system network.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127090993","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398610
Sarveswaren Karunanithi, N. M. Din, H. Hakimie, C. Hua, R. C. Omar, Tan Choon Yee
This paper describes the development of a solar powered wireless landfill monitoring system. A remote data acquisition system was constructed for collecting data on the temperature and gas concentration in a mini landfill setup. The data acquisition setup is powered by solar power and data transmission conducted wirelessly. The system consists of temperature and methane sensors, wireless data acquisition system, solar charging system and graphical user interface via LabVIEW.
{"title":"Performance of labscale solar powered wireless landfill monitoring system","authors":"Sarveswaren Karunanithi, N. M. Din, H. Hakimie, C. Hua, R. C. Omar, Tan Choon Yee","doi":"10.1109/ICEENVIRON.2009.5398610","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398610","url":null,"abstract":"This paper describes the development of a solar powered wireless landfill monitoring system. A remote data acquisition system was constructed for collecting data on the temperature and gas concentration in a mini landfill setup. The data acquisition setup is powered by solar power and data transmission conducted wirelessly. The system consists of temperature and methane sensors, wireless data acquisition system, solar charging system and graphical user interface via LabVIEW.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128216250","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398624
D. Buttsworth
A multizone model for the thermodynamic simulation of internal combustion engines has been developed. The new, multizone model differs from earlier, related formulations in a number of important respects. A number of zones, both burned and unburned, can be tracked throughout the entire simulation. Heat transfer areas for burned and unburned zones can be specified as a function of engine geometry. Leakage of gas past piston rings can be simulated using a flow rate model driven by pressure differences. Furthermore, the injection of fuel during the compression stroke and charge stratification across the zones can also be simulated. In this paper, an overview of some of these features is provided. An initial assessment of the pressures, temperatures, and NO concentrations derived from the model is also performed by comparing results obtained from the present modeling with results from two earlier simulations.
{"title":"Multizone internal combustion engine modelling: Initial assessme of a simulation tool developed in matlab","authors":"D. Buttsworth","doi":"10.1109/ICEENVIRON.2009.5398624","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398624","url":null,"abstract":"A multizone model for the thermodynamic simulation of internal combustion engines has been developed. The new, multizone model differs from earlier, related formulations in a number of important respects. A number of zones, both burned and unburned, can be tracked throughout the entire simulation. Heat transfer areas for burned and unburned zones can be specified as a function of engine geometry. Leakage of gas past piston rings can be simulated using a flow rate model driven by pressure differences. Furthermore, the injection of fuel during the compression stroke and charge stratification across the zones can also be simulated. In this paper, an overview of some of these features is provided. An initial assessment of the pressures, temperatures, and NO concentrations derived from the model is also performed by comparing results obtained from the present modeling with results from two earlier simulations.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128476602","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398644
K. M. Chin, N. A. Hamid, K. W. See, K. Sahari
Superconducting electrical devices have been developed in various fields especially in the energy industry over a decade. Superconducting motor is one of the electrical devices that attracted the attention of engineers and researchers from the universities and industries due to its distinctive energy efficiency. This paper addresses the performance of superconducting-wound electric motor when compared with conventional copper-wound electric motor. DC synchronous single-phase series motor has been chosen as the base for development of both motors. Two prototypes of electric motor fabricated using conventional copper coils and superconducting coils were developed with similar motor type, design, dimensions, and features. The superconducting motor coils were wound using the drastically innovative Bi-2223 (DI-BSCCO) Type H wires developed by the Sumitomo Electric Industries Limited, Japan. A finite element analysis was also performed to get a clear view on flux plots of the magnetic induction. Features of the superconducting motor and the special coil frame designed to protect the superconducting wire was also presented in this paper. In addition, the torque performances for both types of motor were measured. The superconducting electric motor was found to consume lower power to produce the same output compared with the conventional copper-wound motor.
{"title":"Investigation on the performance of the DI-BSCCO superconducting electric motor","authors":"K. M. Chin, N. A. Hamid, K. W. See, K. Sahari","doi":"10.1109/ICEENVIRON.2009.5398644","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398644","url":null,"abstract":"Superconducting electrical devices have been developed in various fields especially in the energy industry over a decade. Superconducting motor is one of the electrical devices that attracted the attention of engineers and researchers from the universities and industries due to its distinctive energy efficiency. This paper addresses the performance of superconducting-wound electric motor when compared with conventional copper-wound electric motor. DC synchronous single-phase series motor has been chosen as the base for development of both motors. Two prototypes of electric motor fabricated using conventional copper coils and superconducting coils were developed with similar motor type, design, dimensions, and features. The superconducting motor coils were wound using the drastically innovative Bi-2223 (DI-BSCCO) Type H wires developed by the Sumitomo Electric Industries Limited, Japan. A finite element analysis was also performed to get a clear view on flux plots of the magnetic induction. Features of the superconducting motor and the special coil frame designed to protect the superconducting wire was also presented in this paper. In addition, the torque performances for both types of motor were measured. The superconducting electric motor was found to consume lower power to produce the same output compared with the conventional copper-wound motor.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131447581","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398640
H. Hashim, Y. R. Omar, I. Abidin, R. A. Zahidi, N. Ahmad, A. M. Ali
Heavily loaded condition may lead to power system instability either due to sudden increase in load or tripping of adjacent transmission line. When load increases, the apparent impedance decreases accordingly depending on the nature of load, similar instances can be observed during short circuit event [1, 2]. In addition, the system may also experience voltage instability originating from high power flow through the transmission line during fault and line outage condition. Hence, the ability for the system to quickly indicate possible voltage instability via fast voltage indicator is important in mitigating voltage instability from being further aggravated. Undesirable disconnection of transmission lines should also be avoided during voltage instability, while load encroachment possibilities into protective zone may cause unnecessary line isolation, which would result in cascading tripping [3, 4]. This paper presents the correlation between the apparent impedance calculated from different contingency scenario and the derived voltage indicator applied to the IEEE 30 Bus Test System.
{"title":"Weak area analysis based on the apparent impedance and voltage indices","authors":"H. Hashim, Y. R. Omar, I. Abidin, R. A. Zahidi, N. Ahmad, A. M. Ali","doi":"10.1109/ICEENVIRON.2009.5398640","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398640","url":null,"abstract":"Heavily loaded condition may lead to power system instability either due to sudden increase in load or tripping of adjacent transmission line. When load increases, the apparent impedance decreases accordingly depending on the nature of load, similar instances can be observed during short circuit event [1, 2]. In addition, the system may also experience voltage instability originating from high power flow through the transmission line during fault and line outage condition. Hence, the ability for the system to quickly indicate possible voltage instability via fast voltage indicator is important in mitigating voltage instability from being further aggravated. Undesirable disconnection of transmission lines should also be avoided during voltage instability, while load encroachment possibilities into protective zone may cause unnecessary line isolation, which would result in cascading tripping [3, 4]. This paper presents the correlation between the apparent impedance calculated from different contingency scenario and the derived voltage indicator applied to the IEEE 30 Bus Test System.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130230130","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398635
K. M. Pang, H. Ng, S. Gan
This piece of work seeks to address issues related to combustion of diesel fuel in light-duty engines, with an emphasis on bridging detailed chemical kinetics mechanism and Computational Fluid Dynamics (CFD). Numerical computation was undertaken by means of integrating CHEMKIN and FLUENT software. The computational effort was focused onto the Laminar Finite Rate model, incorporating a surrogate diesel fuel mechanism. Resulting effect on the formation of nitrogen oxides (NOx) and soot, and computational expenses-related issues are of particular interest. Three dimensional simulations were deployed and the results generated were compared against experimental output. Current 3-D simulations attained showed predictive capabilities.
{"title":"Light-duty diesel engine modelling with integrated detailed chemistry in 3-D CFD study","authors":"K. M. Pang, H. Ng, S. Gan","doi":"10.1109/ICEENVIRON.2009.5398635","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398635","url":null,"abstract":"This piece of work seeks to address issues related to combustion of diesel fuel in light-duty engines, with an emphasis on bridging detailed chemical kinetics mechanism and Computational Fluid Dynamics (CFD). Numerical computation was undertaken by means of integrating CHEMKIN and FLUENT software. The computational effort was focused onto the Laminar Finite Rate model, incorporating a surrogate diesel fuel mechanism. Resulting effect on the formation of nitrogen oxides (NOx) and soot, and computational expenses-related issues are of particular interest. Three dimensional simulations were deployed and the results generated were compared against experimental output. Current 3-D simulations attained showed predictive capabilities.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131590169","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398646
H. Hasini, M. Yusoff, N. H. Shuaib, M. H. Boosroh, M. Haniff
There are currently numerous studies on utility boilers using various in-house and commercial CFD codes. Most of the existing simulations are aimed at the flow and combustion properties inside the furnace and therefore, it usually terminates at furnace exit just downstream the re-heater section before the crossover path. On top of that, the majority of these works were based on coal-fired boiler furnace, which has completely different combustion characteristics as compared to natural gas fired boiler. This paper describes an investigation of the prediction of combustion characteristics and flow pattern in a gas-fired boiler. The emphasis is given towards the analysis of flow pattern and its distribution inside the furnace in a steady-state manner. In this investigation, the flow path is extended so that the rear pass, which normally been ignored is included in the calculation domain. Commercial CFD code, CFD ACE+ was used as a tool to carry out the analysis.
{"title":"Analysis of flow and temperature distribution in a full scale utility boiler using CFD","authors":"H. Hasini, M. Yusoff, N. H. Shuaib, M. H. Boosroh, M. Haniff","doi":"10.1109/ICEENVIRON.2009.5398646","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398646","url":null,"abstract":"There are currently numerous studies on utility boilers using various in-house and commercial CFD codes. Most of the existing simulations are aimed at the flow and combustion properties inside the furnace and therefore, it usually terminates at furnace exit just downstream the re-heater section before the crossover path. On top of that, the majority of these works were based on coal-fired boiler furnace, which has completely different combustion characteristics as compared to natural gas fired boiler. This paper describes an investigation of the prediction of combustion characteristics and flow pattern in a gas-fired boiler. The emphasis is given towards the analysis of flow pattern and its distribution inside the furnace in a steady-state manner. In this investigation, the flow path is extended so that the rear pass, which normally been ignored is included in the calculation domain. Commercial CFD code, CFD ACE+ was used as a tool to carry out the analysis.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133263647","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398616
K. M. Munisamy, M. Yusoff, Soong Peng Soon, Pang Win Cheong
In this study CFD simulation is done on two types of metallic duct design to investigate the pressure drop of flow through an elbow. The PU/PIR duct is new and fast growing integrated material of aluminum and insulation material compacted together to achieve thinner overall thickness as compared to conventional steel ducting with insulation wrapped around it. As compare with sheet metal duct fittings, PU/PIR duct fitting has numerous notches inside the duct fittings. These notches (or grooves) are necessary in the fabrication of fitting components because PU/PIR panel cannot be bent without these notches as the panel is very thick (20mm). On the other hand, sheet metal does not need these notches to be bent since it is thin (0.5∼1.2mm). This paper investigates the effect on friction loss of duct fitting with some of these notches in the air stream. A simple 90 degree elbow of 300mm×300mm duct dimension is simulated for comparison. The PU/PIR sheet metal design compared to PU/PIR duct with notch has slight difference in terms of pressure loss. It can be concluded that notches in PU/PIR duct design has negligible effect on the pressure loss but it has numerous advantages compared to conventional HVAC duct fabrication design. The detail results are discussed.
{"title":"CFD analysis onto PU/PIR fitting in rectangular duct","authors":"K. M. Munisamy, M. Yusoff, Soong Peng Soon, Pang Win Cheong","doi":"10.1109/ICEENVIRON.2009.5398616","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398616","url":null,"abstract":"In this study CFD simulation is done on two types of metallic duct design to investigate the pressure drop of flow through an elbow. The PU/PIR duct is new and fast growing integrated material of aluminum and insulation material compacted together to achieve thinner overall thickness as compared to conventional steel ducting with insulation wrapped around it. As compare with sheet metal duct fittings, PU/PIR duct fitting has numerous notches inside the duct fittings. These notches (or grooves) are necessary in the fabrication of fitting components because PU/PIR panel cannot be bent without these notches as the panel is very thick (20mm). On the other hand, sheet metal does not need these notches to be bent since it is thin (0.5∼1.2mm). This paper investigates the effect on friction loss of duct fitting with some of these notches in the air stream. A simple 90 degree elbow of 300mm×300mm duct dimension is simulated for comparison. The PU/PIR sheet metal design compared to PU/PIR duct with notch has slight difference in terms of pressure loss. It can be concluded that notches in PU/PIR duct design has negligible effect on the pressure loss but it has numerous advantages compared to conventional HVAC duct fabrication design. The detail results are discussed.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114500011","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398613
A. Fadhilah, S. Suriawati, H. Amir, Z. A. Izham, S. Mahendran
Time series analysis has been applied intensively and sophisticatedly to model and forecast many problems in the biological, physical and environmental phenomena of interest. This fact accounts for the basic engineering problem in forecasting the daily peak system load to use time series analysis. ARMA and REgARMA models are among the times series models considered. ANFIS, a hybrid model from neural network is also discussed as for comparison purposes. The main interest of the forecasts consists of three days up to five days ahead predictions for daily data. The pure autoregressive model with an order 2, or AR (2) with a MAPE value of 1.27% is found to be an appropriate model for forecasting the Malaysian peak daily load for the 3 days ahead prediction. ANFIS model gives a better MAPE value when weekends' data were excluded. Regression models with ARMA errors are found to be good models for forecasting different day types. The selection of these models is depended on the smallest value of AIC statistic and the forecasting accuracy criteria.
{"title":"Malaysian day-type load forecasting","authors":"A. Fadhilah, S. Suriawati, H. Amir, Z. A. Izham, S. Mahendran","doi":"10.1109/ICEENVIRON.2009.5398613","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398613","url":null,"abstract":"Time series analysis has been applied intensively and sophisticatedly to model and forecast many problems in the biological, physical and environmental phenomena of interest. This fact accounts for the basic engineering problem in forecasting the daily peak system load to use time series analysis. ARMA and REgARMA models are among the times series models considered. ANFIS, a hybrid model from neural network is also discussed as for comparison purposes. The main interest of the forecasts consists of three days up to five days ahead predictions for daily data. The pure autoregressive model with an order 2, or AR (2) with a MAPE value of 1.27% is found to be an appropriate model for forecasting the Malaysian peak daily load for the 3 days ahead prediction. ANFIS model gives a better MAPE value when weekends' data were excluded. Regression models with ARMA errors are found to be good models for forecasting different day types. The selection of these models is depended on the smallest value of AIC statistic and the forecasting accuracy criteria.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123440647","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 : 2009-12-01DOI: 10.1109/ICEENVIRON.2009.5398622
I. Hussein, M. A. A. Rahman, T. María
Field studies on the environmental conditions and occupant comfort were carried out in air-conditioned buildings and non air-conditioned buildings in Malaysia. The study on the air-conditioned buildings was carried out in UNITEN and for the non air-conditioned buildings in two schools, which is a primary and secondary school, and in a public waiting area in a health clinic in Johor Bahru, located in the southern region of Malaysia. The non air-conditioned buildings were mechanically ventilated by fans. The studies were made in different days from morning until noon as to get variation of temperatures, collecting a full set of objective physical measurements and subjective assessments through questionnaires. The measured environmental parameters were air temperature, relative humidity and air velocity. The subjective responses concern the judgment of the respondents about the thermal environment at the moment of measurements. The results obtained showed that majority of the respondents found that their indoor thermal conditions acceptable even though most of the thermal sensation votes (TSV) exceeded those specified by ASHRAE Standard 55 and the environmental assessments exceeded the standard. The neutral temperature and comfort range were obtained through linear regression analysis of TSV and in the Fanger's PMV model. From the subjective assessment, it was found that the occupants can accept the thermal range beyond the ASHRAE comfort zone. The neutral temperature of 24.4°C and 28.4°C for air-conditioned and non air-conditioned buildings respectively, were obtained by regression analysis of TSV on operative temperature. The acceptable range of temperature obtained by regression analysis of TSV were 23.1°C to 25.6°C for air-conditioned buildings and 26.0°C to 30.7°C for non air-conditioned buildings.
{"title":"Field studies on thermal comfort of air-conditioned and non air-conditioned buildings in Malaysia","authors":"I. Hussein, M. A. A. Rahman, T. María","doi":"10.1109/ICEENVIRON.2009.5398622","DOIUrl":"https://doi.org/10.1109/ICEENVIRON.2009.5398622","url":null,"abstract":"Field studies on the environmental conditions and occupant comfort were carried out in air-conditioned buildings and non air-conditioned buildings in Malaysia. The study on the air-conditioned buildings was carried out in UNITEN and for the non air-conditioned buildings in two schools, which is a primary and secondary school, and in a public waiting area in a health clinic in Johor Bahru, located in the southern region of Malaysia. The non air-conditioned buildings were mechanically ventilated by fans. The studies were made in different days from morning until noon as to get variation of temperatures, collecting a full set of objective physical measurements and subjective assessments through questionnaires. The measured environmental parameters were air temperature, relative humidity and air velocity. The subjective responses concern the judgment of the respondents about the thermal environment at the moment of measurements. The results obtained showed that majority of the respondents found that their indoor thermal conditions acceptable even though most of the thermal sensation votes (TSV) exceeded those specified by ASHRAE Standard 55 and the environmental assessments exceeded the standard. The neutral temperature and comfort range were obtained through linear regression analysis of TSV and in the Fanger's PMV model. From the subjective assessment, it was found that the occupants can accept the thermal range beyond the ASHRAE comfort zone. The neutral temperature of 24.4°C and 28.4°C for air-conditioned and non air-conditioned buildings respectively, were obtained by regression analysis of TSV on operative temperature. The acceptable range of temperature obtained by regression analysis of TSV were 23.1°C to 25.6°C for air-conditioned buildings and 26.0°C to 30.7°C for non air-conditioned buildings.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128470684","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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