European Union members seek to establish the principles of a circular economy, which is based on the efficient use of raw materials and resources. This requirement will have an impact on business and in particular on the road construction sector. Hence the need to improve the asphalt mixing plant (AMP) mixing technology utilizing as much as possible reclaimed asphalt pavement (RAP) to produce asphalt mixtures (AM) for road construction. The resources used to produce new AM in the world are endless and becoming more expensive in a time scale. The multi-cycle reuse of RAP producing AM is a priority, when thinking about of economical recycling materials usage and the saving of resources. The design and development of RAP hot recycling in-plant technologies has been in progress for approximately half a century. In high-level-economy countries, AM production currently processes on average approx. 80% of the amount of RAP using innovative techniques on AMPs. Design of various AMP, their assessment on the flexible application of innovative techniques depending on the RAP processing method, are described in this paper. In this paper different recycling technologies in AMP and their advantages and disadvantages are reviewed. The research result indicates technical possibilities hot recycling in-plant in Baltic countries. Local authorities, research institutes, road construction and road design companies could use these results in the future.
{"title":"ANALYSIS OF DESIGN AND TECHNOLOGICAL PROCESSES OF HOT RECYCLING ASPHALT MIXTURE AT BATCH ASPHALT MIXING PLANTS","authors":"Mindaugas Martišius, H. Sivilevičius","doi":"10.3846/enviro.2020.632","DOIUrl":"https://doi.org/10.3846/enviro.2020.632","url":null,"abstract":"European Union members seek to establish the principles of a circular economy, which is based on the efficient use of raw materials and resources. \u0000 This requirement will have an impact on business and in particular on the road construction sector. Hence the need to improve the asphalt mixing plant (AMP) mixing technology \u0000 utilizing as much as possible reclaimed asphalt pavement (RAP) to produce asphalt mixtures (AM) for road construction. The resources used to produce new AM in the world \u0000 are endless and becoming more expensive in a time scale. The multi-cycle reuse of RAP producing AM is a priority, when thinking about of economical recycling materials \u0000 usage and the saving of resources. The design and development of RAP hot recycling in-plant technologies has been in progress for approximately half a century. In \u0000 high-level-economy countries, AM production currently processes on average approx. 80% of the amount of RAP using innovative techniques on AMPs. Design of various AMP, \u0000 their assessment on the flexible application of innovative techniques depending on the RAP processing method, are described in this paper. In this paper different recycling \u0000 technologies in AMP and their advantages and disadvantages are reviewed. The research result indicates technical possibilities hot recycling in-plant in Baltic countries. \u0000 Local authorities, research institutes, road construction and road design companies could use these results in the future.","PeriodicalId":375773,"journal":{"name":"The 11th International Conference ENVIRONMENTAL ENGINEERING 11th ICEE SELECTED PAPERS","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126750279","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}
Modern air handling units (AHU) are increasingly finding solutions in which the main energy transformers are an air heat pump (HP) and a heat recovery exchanger (HRE). The energy conversion modes of such devices are constantly changing in accordance with the constant change on the state of the outdoor air (temperature, humidity). Flexibility, being able to respond to ever-changing ambient air parameters, is an important feature of energy transformation component mode control. The overall seasonal efficiency of the air handling unit depends on this. In this work, a thermodynamic analysis of the characteristic energy transformations of the air handling unit is performed, linking the outdoor and ventilated indoor air and HP refrigerant states, flow rates and component loads. Such parametric analysis with respect to the changing outdoor air temperature allowed to clearly reveal, through various indicators, the influence of the individual components on the operating efficiency of the air handling unit. Combinations of parameters have been obtained that enable the selection of the optimal control concept for the energy conversion mode of the components in the air handling unit (component loads, fluids state parameters and flow rates) over a wide range of outdoor air temperatures.
{"title":"ENERGY CONVERSION MODES DEPENDING ON THE OUTDOOR TEMPERATURE FOR AN AIR HANDLING UNIT WITH A HEAT PUMP","authors":"A. Frik, V. Martinaitis, Juozas Bielskus","doi":"10.3846/enviro.2020.602","DOIUrl":"https://doi.org/10.3846/enviro.2020.602","url":null,"abstract":"Modern air handling units (AHU) are increasingly finding solutions in which the main energy transformers are an air heat pump (HP) \u0000 and a heat recovery exchanger (HRE). The energy conversion modes of such devices are constantly changing in accordance with the constant change on the state \u0000 of the outdoor air (temperature, humidity). Flexibility, being able to respond to ever-changing ambient air parameters, is an important feature of energy \u0000 transformation component mode control. The overall seasonal efficiency of the air handling unit depends on this. In this work, a thermodynamic analysis of \u0000 the characteristic energy transformations of the air handling unit is performed, linking the outdoor and ventilated indoor air and HP refrigerant states, \u0000 flow rates and component loads. Such parametric analysis with respect to the changing outdoor air temperature allowed to clearly reveal, through various \u0000 indicators, the influence of the individual components on the operating efficiency of the air handling unit. Combinations of parameters have been obtained \u0000 that enable the selection of the optimal control concept for the energy conversion mode of the components in the air handling unit (component loads, fluids \u0000 state parameters and flow rates) over a wide range of outdoor air temperatures.","PeriodicalId":375773,"journal":{"name":"The 11th International Conference ENVIRONMENTAL ENGINEERING 11th ICEE SELECTED PAPERS","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128134123","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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