Pub Date : 2004-05-01DOI: 10.1191/0143624404bt094oa
Xin-hua Xu, Shengwei Wang, Wenzhong Shi
The controllers of air-handling units (AHU) should exploit split-range sequencing control strategies to determine the most economic way to use the AHU components to maintain the outlet air temperature at the set point. The control instability during the transition regions between different control modes as well as the problems in tuning the control loop(s) involving processes of different dynamic parameters are among the major diffculties when utilizing AHU sequencing control strategies in applications. A three PIs split-range sequencing control strategy with ‘freezing’ and gain scheduling schemes (SRFG) is developed addressing these problems. ‘Freezing’ means that the PI output is xed at zero or one together with its integral term. SRFG is evaluated in various simulation tests and by comparing with conventional three PIs split-range sequencing control strategies. Test results demonstrate that SRFG strategy allows stable and robust AHU control.
{"title":"A robust sequencing control strategy for air-handling units","authors":"Xin-hua Xu, Shengwei Wang, Wenzhong Shi","doi":"10.1191/0143624404bt094oa","DOIUrl":"https://doi.org/10.1191/0143624404bt094oa","url":null,"abstract":"The controllers of air-handling units (AHU) should exploit split-range sequencing control strategies to determine the most economic way to use the AHU components to maintain the outlet air temperature at the set point. The control instability during the transition regions between different control modes as well as the problems in tuning the control loop(s) involving processes of different dynamic parameters are among the major diffculties when utilizing AHU sequencing control strategies in applications. A three PIs split-range sequencing control strategy with ‘freezing’ and gain scheduling schemes (SRFG) is developed addressing these problems. ‘Freezing’ means that the PI output is xed at zero or one together with its integral term. SRFG is evaluated in various simulation tests and by comparing with conventional three PIs split-range sequencing control strategies. Test results demonstrate that SRFG strategy allows stable and robust AHU control.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133676581","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 : 2004-05-01DOI: 10.1191/0143624404bt093oa
T. Chenvidyakarn, A. Woods
This paper investigates the control of the natural ventilation of an auditorium or other occupied open-plan space, which vents into a cold exterior through its upper opening, and into which fresh pre-cooled air is drawn through its lower opening. The occupants located at an intermediate level between the upper and lower openings act as an internal source of heat, providing upward buoyancy which drives the ventilation and draws fresh air through the pre-cooling system. These conditions produce a steady state displacement ventilation regime in which the room becomes stratified into two layers, with the transition zone dividing the upper layer of warm air from the lower layer of pre-cooled air across the occupied level. A quantitative model is developed to describe this ventilation process and to investigate the sensitivity of the system. The model is successfully tested with laboratory experiments and shows that with pre-cooled natural ventilation, both ventilation rate and the temperature in the region above and below the heat source may be controlled by the pre-cooling. The paper discusses how such pre-cooling may be manipulated to bring about ventilation and thermal comfort in the ventilated space with a view to maximizing the seasonal range for which natural ventilation is possible.
{"title":"The control of pre-cooled natural ventilation","authors":"T. Chenvidyakarn, A. Woods","doi":"10.1191/0143624404bt093oa","DOIUrl":"https://doi.org/10.1191/0143624404bt093oa","url":null,"abstract":"This paper investigates the control of the natural ventilation of an auditorium or other occupied open-plan space, which vents into a cold exterior through its upper opening, and into which fresh pre-cooled air is drawn through its lower opening. The occupants located at an intermediate level between the upper and lower openings act as an internal source of heat, providing upward buoyancy which drives the ventilation and draws fresh air through the pre-cooling system. These conditions produce a steady state displacement ventilation regime in which the room becomes stratified into two layers, with the transition zone dividing the upper layer of warm air from the lower layer of pre-cooled air across the occupied level. A quantitative model is developed to describe this ventilation process and to investigate the sensitivity of the system. The model is successfully tested with laboratory experiments and shows that with pre-cooled natural ventilation, both ventilation rate and the temperature in the region above and below the heat source may be controlled by the pre-cooling. The paper discusses how such pre-cooling may be manipulated to bring about ventilation and thermal comfort in the ventilated space with a view to maximizing the seasonal range for which natural ventilation is possible.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115584569","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 : 2004-03-16DOI: 10.1191/0143624404bt107oa
G. C. da Graça, P. Linden, P. Haves
The design for the new Federal Building for San Francisco includes an office tower that is to be naturally ventilated. Each floor is designed to be cross-ventilated, through upper windows that are controlled by the building management system. Users have control over lower level windows, which can be as much as 50% of the total openable area. There are significant differences in the performance and the control of the windward and leeward sides of the building, and separate monitoring and control strategies are determined for each side. The performance and control of the building has been designed and tested using a modified version of EnergyPlus. Results from studies with EnergyPlus and computational fluid dynamics are used in designing the control strategy. Wind-driven cross-ventilation produces a main jet through the upper openings of the building, across the ceiling from the windward to the leeward side. Below this jet, the occupied regions are subject to a recirculating airflow. Results show that temperatures within the building are predicted to be satisfactory, provided a suitable control strategy is implemented that uses night cooling in periods of hot weather. The control strategy has 10 window opening modes. EnergyPlus was extended to simulate the effects of these modes, and to assess the effects of different forms of user behaviour. The results show how user behaviour can significantly influence the building performance.
{"title":"Design and testing of a control strategy for a large, naturally ventilated office building","authors":"G. C. da Graça, P. Linden, P. Haves","doi":"10.1191/0143624404bt107oa","DOIUrl":"https://doi.org/10.1191/0143624404bt107oa","url":null,"abstract":"The design for the new Federal Building for San Francisco includes an office tower that is to be naturally ventilated. Each floor is designed to be cross-ventilated, through upper windows that are controlled by the building management system. Users have control over lower level windows, which can be as much as 50% of the total openable area. There are significant differences in the performance and the control of the windward and leeward sides of the building, and separate monitoring and control strategies are determined for each side. The performance and control of the building has been designed and tested using a modified version of EnergyPlus. Results from studies with EnergyPlus and computational fluid dynamics are used in designing the control strategy. Wind-driven cross-ventilation produces a main jet through the upper openings of the building, across the ceiling from the windward to the leeward side. Below this jet, the occupied regions are subject to a recirculating airflow. Results show that temperatures within the building are predicted to be satisfactory, provided a suitable control strategy is implemented that uses night cooling in periods of hot weather. The control strategy has 10 window opening modes. EnergyPlus was extended to simulate the effects of these modes, and to assess the effects of different forms of user behaviour. The results show how user behaviour can significantly influence the building performance.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130225027","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 : 2004-02-01DOI: 10.1191/0143624404bt088oa
J. Lebrun, C. A. Silva, F. Trebilcock, E. Winandy
This paper presents a simplified method of analysing the combined heat and mass transfer phenomena in direct and indirect contact cooling towers and evaporative condensers. The theoretical basis of the model is Merkel's theory. The cooling towers, evaporative condensers and fluid coolers are considered as members of a classical heat exchanger family, working in wet regime. Here, the air side heat and mass transfer processes are governed by the same basic process. This paper shows that a `unified' theoretical treatment may be applied to all three evaporative exchangers. The key difference in the theory for each type relates to these exchangers unique characteristic, the global heat transfer coefcient AU, or the corresponding thermal resistances of the fluids. Specific correlations for the calculation of AU or of the equivalent thermal resistances, considering the influence of the water and air flow rates entering the exchangers, are discussed. An example for each case is shown, illustrating the validation of the models with catalogue data.
{"title":"Simplified models for direct and indirect contact cooling towers and evaporative condensers","authors":"J. Lebrun, C. A. Silva, F. Trebilcock, E. Winandy","doi":"10.1191/0143624404bt088oa","DOIUrl":"https://doi.org/10.1191/0143624404bt088oa","url":null,"abstract":"This paper presents a simplified method of analysing the combined heat and mass transfer phenomena in direct and indirect contact cooling towers and evaporative condensers. The theoretical basis of the model is Merkel's theory. The cooling towers, evaporative condensers and fluid coolers are considered as members of a classical heat exchanger family, working in wet regime. Here, the air side heat and mass transfer processes are governed by the same basic process. This paper shows that a `unified' theoretical treatment may be applied to all three evaporative exchangers. The key difference in the theory for each type relates to these exchangers unique characteristic, the global heat transfer coefcient AU, or the corresponding thermal resistances of the fluids. Specific correlations for the calculation of AU or of the equivalent thermal resistances, considering the influence of the water and air flow rates entering the exchangers, are discussed. An example for each case is shown, illustrating the validation of the models with catalogue data.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"642 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131885391","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 : 2004-02-01DOI: 10.1191/0143624404bt086oa
L. Marjanovic, M. Eftekhari
In this paper the design and validation process of a supervisory control for a single-sided naturally ventilated test room is described. The controller is based on fuzzy logic reasoning and sets of linguistic rules in the form of IF-THEN rules are used. The inputs to the controller are the outside wind speed, outside and inside temperatures. The output is the position of the opening. The basis of any fuzzy rule system is the inference engine responsible for the input's fuzzi® cation, fuzzy processing of the rule base and defuzzi® cation of the output. The choice of the inference engine, starting with the selection of input and output variables and their membership functions. Three rule bases of different complexity were developed and are presented and analysed here. Validation through simulation offers possibility of testing the controller under extreme conditions regardless of physical limitations of an experimental test cell. Simulations were performed for different typical levels of input parameters and also for extreme ctitious conditions. Simulations were carefully designed to allow simultaneous comparison of different controllers' performances. Simulation results have shown that all three controllers are capable of responding to the changes in outside conditions by adjusting the opening positions. They satisfy security requirements due to strong wind and successfully, in a stable manner respond to sudden changes in wind velocity and outdoor temperature. A controller with more membership functions and therefore a larger number of IF-THEN rules was more responsive to the changes in outside conditions.
{"title":"Design and simulation of a fuzzy controller for naturally ventilated buildings","authors":"L. Marjanovic, M. Eftekhari","doi":"10.1191/0143624404bt086oa","DOIUrl":"https://doi.org/10.1191/0143624404bt086oa","url":null,"abstract":"In this paper the design and validation process of a supervisory control for a single-sided naturally ventilated test room is described. The controller is based on fuzzy logic reasoning and sets of linguistic rules in the form of IF-THEN rules are used. The inputs to the controller are the outside wind speed, outside and inside temperatures. The output is the position of the opening. The basis of any fuzzy rule system is the inference engine responsible for the input's fuzzi® cation, fuzzy processing of the rule base and defuzzi® cation of the output. The choice of the inference engine, starting with the selection of input and output variables and their membership functions. Three rule bases of different complexity were developed and are presented and analysed here. Validation through simulation offers possibility of testing the controller under extreme conditions regardless of physical limitations of an experimental test cell. Simulations were performed for different typical levels of input parameters and also for extreme ctitious conditions. Simulations were carefully designed to allow simultaneous comparison of different controllers' performances. Simulation results have shown that all three controllers are capable of responding to the changes in outside conditions by adjusting the opening positions. They satisfy security requirements due to strong wind and successfully, in a stable manner respond to sudden changes in wind velocity and outdoor temperature. A controller with more membership functions and therefore a larger number of IF-THEN rules was more responsive to the changes in outside conditions.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"313 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126484350","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 : 2004-02-01DOI: 10.1191/0143624404bt089oa
R. Buswell, J. Wright
Model-based techniques for automated condition monitoring of HVAC systems have been under development for some years. The generation of false alarms has been identified as a principal factor affecting the potential usefulness of condition monitoring in HVAC applications. Results from the application of these methods to systems installed in real buildings have highlighted the difficulty in selecting good alarm thresholds that balance robustness (lack of false alarms) and sensitivity (early detection). This paper demonstrates that this balance can be met in a transparent and analytical manner, through the application of uncertainty analysis. The paper discusses the sources of uncertainty associated with component models and system measurements. A condition monitoring scheme applied to a typical HVAC cooling coil subsystem installed in a real building is presented. Faults are artificially introduced into the system and are used in conjunction with fault-free operation to demonstrate the sensitivity and robustness of the scheme. The principle conclusions drawn by the paper consider the likely minimum magnitudes of faults that can be detected in typical HVAC systems, without false alarm generation. More broadly however, the paper demonstrates that the issue of uncertainty affects all aspects of system monitoring, modelling and control.
{"title":"Uncertainty in model-based condition monitoring","authors":"R. Buswell, J. Wright","doi":"10.1191/0143624404bt089oa","DOIUrl":"https://doi.org/10.1191/0143624404bt089oa","url":null,"abstract":"Model-based techniques for automated condition monitoring of HVAC systems have been under development for some years. The generation of false alarms has been identified as a principal factor affecting the potential usefulness of condition monitoring in HVAC applications. Results from the application of these methods to systems installed in real buildings have highlighted the difficulty in selecting good alarm thresholds that balance robustness (lack of false alarms) and sensitivity (early detection). This paper demonstrates that this balance can be met in a transparent and analytical manner, through the application of uncertainty analysis. The paper discusses the sources of uncertainty associated with component models and system measurements. A condition monitoring scheme applied to a typical HVAC cooling coil subsystem installed in a real building is presented. Faults are artificially introduced into the system and are used in conjunction with fault-free operation to demonstrate the sensitivity and robustness of the scheme. The principle conclusions drawn by the paper consider the likely minimum magnitudes of faults that can be detected in typical HVAC systems, without false alarm generation. More broadly however, the paper demonstrates that the issue of uncertainty affects all aspects of system monitoring, modelling and control.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134491535","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 : 2004-02-01DOI: 10.1191/0143624404bt087oa
T. Stuetzle, N. Blair, W. Beckman, J. Mitchell
In a solar electric generating system (SEGS), it is important to maintain a specied set point for the collector outlet temperature. Currently, a skilled plant operator adjusts the volume flow rate of the heat transfer fluid circulating through the collectors to achieve this goal. In this paper, a linear model predictive controller that approximates the behaviour of the operator and that can be used to control the plant is described. The development of the plant model and controller are presented. The performance of the controller is evaluated and the influence of the control on the gross output of the plant is examined. The use of the linear model predictive controller to control building energy systems that have signi® cant capacitance and fluid time delays is discussed.
{"title":"Use of linear predictive control for a solar electric generating system","authors":"T. Stuetzle, N. Blair, W. Beckman, J. Mitchell","doi":"10.1191/0143624404bt087oa","DOIUrl":"https://doi.org/10.1191/0143624404bt087oa","url":null,"abstract":"In a solar electric generating system (SEGS), it is important to maintain a specied set point for the collector outlet temperature. Currently, a skilled plant operator adjusts the volume flow rate of the heat transfer fluid circulating through the collectors to achieve this goal. In this paper, a linear model predictive controller that approximates the behaviour of the operator and that can be used to control the plant is described. The development of the plant model and controller are presented. The performance of the controller is evaluated and the influence of the control on the gross output of the plant is examined. The use of the linear model predictive controller to control building energy systems that have signi® cant capacitance and fluid time delays is discussed.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"409 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123539039","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 : 2004-02-01DOI: 10.1191/0143624404bt085oa
P. Riederer, D. Marchio
Room models, currently used for controller tests, assume the room air to be perfectly mixed. Considering the results of a study of temperature conditions in real rooms, equipped with different HVAC systems, a new model is developed, assuming a non-uniform temperature distribution in a room. The proposed model is based on the zonal modelling approach where the room air is divided into several sub-volumes. This approach allows taking into account various convective phenomena, which are imposed by the HVAC systems and have an impact on the test of HVAC controllers. The temperatures in the occupant zone as well as at typical sensor positions are the main outputs of the new model. The model has already been validated for different HVAC systems such as radiator, convector and fan-coil unit in heating and cooling mode. The model including a large number of correlations this paper deals with the sensitivity of the results on its main parameters. The paper starts with a general presentation of sensitivity of the main equations used in the model, followed by simulations demonstrating the impact of these parameters on the results. This sensitivity analysis is necessary to evaluate the pertinence of using virtual laboratory tests to compare controllers.
{"title":"Sensitivity analysis of a new room model integrating phenomena of air temperature distribution in controller tests","authors":"P. Riederer, D. Marchio","doi":"10.1191/0143624404bt085oa","DOIUrl":"https://doi.org/10.1191/0143624404bt085oa","url":null,"abstract":"Room models, currently used for controller tests, assume the room air to be perfectly mixed. Considering the results of a study of temperature conditions in real rooms, equipped with different HVAC systems, a new model is developed, assuming a non-uniform temperature distribution in a room. The proposed model is based on the zonal modelling approach where the room air is divided into several sub-volumes. This approach allows taking into account various convective phenomena, which are imposed by the HVAC systems and have an impact on the test of HVAC controllers. The temperatures in the occupant zone as well as at typical sensor positions are the main outputs of the new model. The model has already been validated for different HVAC systems such as radiator, convector and fan-coil unit in heating and cooling mode. The model including a large number of correlations this paper deals with the sensitivity of the results on its main parameters. The paper starts with a general presentation of sensitivity of the main equations used in the model, followed by simulations demonstrating the impact of these parameters on the results. This sensitivity analysis is necessary to evaluate the pertinence of using virtual laboratory tests to compare controllers.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127753371","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 : 2004-02-01DOI: 10.1191/0143624404bt084oa
J. Xia, E. Winandy, B. Georges, Jean Lebrun
This paper presents a testing methodology applicable to variable refrigerant flow (VRF) equipment. A test bench is presented: it consists of a set of six calorimeters, each one fully instrumented and controlled in such a way to compensate almost all combinations of sensible, latent, heating and cooling loads. This test bench is used for a three-pipe VRF system with ve indoor units and one outdoor unit. Examples of testing results are presented in the paper, in order to illustrate the methodology and also validate a simulation model. The (heating or cooling) emission of each indoor unit is identi® ed thanks to a very accurate `air’ balance inside each calorimeter. Refrigerant side (pressure and temperature) measurements are used in order to identify the refrigerant flow rate and the characteristics of the compressors (isentropic effectiveness) and of the terminal units (heat transfer coef® cients) in different regimes. Examples of global performance evaluation are also presented in the paper.
{"title":"Experimental analysis of the performances of variable refrigerant flow systems","authors":"J. Xia, E. Winandy, B. Georges, Jean Lebrun","doi":"10.1191/0143624404bt084oa","DOIUrl":"https://doi.org/10.1191/0143624404bt084oa","url":null,"abstract":"This paper presents a testing methodology applicable to variable refrigerant flow (VRF) equipment. A test bench is presented: it consists of a set of six calorimeters, each one fully instrumented and controlled in such a way to compensate almost all combinations of sensible, latent, heating and cooling loads. This test bench is used for a three-pipe VRF system with ve indoor units and one outdoor unit. Examples of testing results are presented in the paper, in order to illustrate the methodology and also validate a simulation model. The (heating or cooling) emission of each indoor unit is identi® ed thanks to a very accurate `air’ balance inside each calorimeter. Refrigerant side (pressure and temperature) measurements are used in order to identify the refrigerant flow rate and the characteristics of the compressors (isentropic effectiveness) and of the terminal units (heat transfer coef® cients) in different regimes. Examples of global performance evaluation are also presented in the paper.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"10 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133516867","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 : 2003-11-01DOI: 10.1191/0143624403bt076oa
S. Ginestet, P. Stabat, D. Marchio
The control design of open-cycle desiccant systems involves three operation modes (ventilation, evaporative cooling and desiccant cooling) and two control parameters (regeneration temperature and air‘ ow rate) to match the cooling load. Speci” c HVAC component models have been added to SIMBAD library to run in Matlab/SimulinkÒ environment. The control strategy is de” ned using State‘ owÒprogram which is a user-friendly graphical tool. The whole simulation tool is used to set an adapted control strategy. The energy consumption and performance of the desiccant system are investigated for different cases of building loads, thermal inertia and climate during the cooling period.
{"title":"Control design of open-cycle desiccant cooling systems using a graphical environment tool","authors":"S. Ginestet, P. Stabat, D. Marchio","doi":"10.1191/0143624403bt076oa","DOIUrl":"https://doi.org/10.1191/0143624403bt076oa","url":null,"abstract":"The control design of open-cycle desiccant systems involves three operation modes (ventilation, evaporative cooling and desiccant cooling) and two control parameters (regeneration temperature and air‘ ow rate) to match the cooling load. Speci” c HVAC component models have been added to SIMBAD library to run in Matlab/SimulinkÒ environment. The control strategy is de” ned using State‘ owÒprogram which is a user-friendly graphical tool. The whole simulation tool is used to set an adapted control strategy. The energy consumption and performance of the desiccant system are investigated for different cases of building loads, thermal inertia and climate during the cooling period.","PeriodicalId":272488,"journal":{"name":"Building Services Engineering Research and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131539492","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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