scholarly journals Dynamic air supply models add realism to the evaluation of control strategies in water resource recovery facilities

2018 ◽  
Vol 78 (5) ◽  
pp. 1104-1114 ◽  
Author(s):  
Pau Juan-García ◽  
Mehlika A. Kiser ◽  
Oliver Schraa ◽  
Leiv Rieger ◽  
Lluís Corominas
Keyword(s):  
Energy Consumption ◽  
Water Resource ◽  
Process Model ◽  
Energy Savings ◽  
Control Strategies ◽  
Resource Recovery ◽  
Distribution Model ◽  
Air Distribution ◽  
Oxygen Control ◽  
Dissolved Oxygen Control

Abstract This paper introduces the application of a fully dynamic air distribution model integrated with a biokinetic process model and a detailed process control model. By using a fully dynamic air distribution model, it is possible to understand the relationships between aeration equipment, control algorithms, process performance, and energy consumption, thus leading to a significantly more realistic prediction of water resource recovery facility (WRRF) performance. Consequently, this leads to an improved design of aeration control strategies and equipment. A model-based audit has been performed for the Girona WRRF with the goal of providing a more objective evaluation of energy reduction strategies. Currently, the Girona plant uses dissolved oxygen control and has been manually optimised for energy consumption. Results from a detailed integrated model show that the implementation of an ammonia-based aeration controller, a redistribution of the diffusers, and the installation of a smaller blower lead to energy savings between 12 and 21%, depending on wastewater temperature. The model supported the development of control strategies that counter the effects of current equipment limitations, such as tapered diffuser distribution, or over-sized blowers. The latter causes an intermittent aeration pattern with blowers switching on and off, increasing wear of the equipment.

SUPPLEMENTAL ENERGY SAVINGS TO AUTOMATIC DISSOLVED OXYGEN CONTROL USING OUR PROCESS

2000 ◽  
Vol 2000 (10) ◽  
pp. 847-856
Author(s):  
Rich W. DiMassimo ◽  
Caroline C. Broughton ◽  
Sun-Nan Hong ◽  
Terry J. Mah
Keyword(s):  
Dissolved Oxygen ◽  
Energy Savings ◽  
Oxygen Control ◽  
Dissolved Oxygen Control

scholarly journals Process schemes for future energy-positive water resource recovery facilities

2019 ◽  
Vol 79 (9) ◽  
pp. 1808-1820 ◽  
Author(s):  
Kimberly Solon ◽  
Mingsheng Jia ◽  
Eveline I. P. Volcke
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Water Resource ◽  
Municipal Wastewater ◽  
Energy Savings ◽  
Wastewater Treatment Plants ◽  
Resource Recovery ◽  
High Rate ◽  
Plant Performance ◽  
Municipal Wastewater Treatment

Abstract There are numerous successful studies on optimizing the performance of conventional activated sludge (CAS)-based wastewater treatment plants. However, recent studies have shown that a more significant improvement of the plant performance is achievable through integration of established technologies in novel process schemes. High-rate activated sludge system, chemically enhanced primary treatment, partial nitritation-anammox, partial nitrification-denitrification over nitrite and anaerobic digestion are integrated in two process schemes to determine to which extent energy savings and energy production can be achieved with these new process layouts compared to a CAS-based process scheme. The results presented in this paper show that there is potential for achieving future energy-positive water resource recovery facilities through novel integration of mature technologies for municipal wastewater treatment.

scholarly journals OPTIMIZATION APPLIED TO ENERGY EFFICIENCY AND THERMAL COMFORT OF BUILDINGS: BIBLIOMETRIC ANALYSIS ON TECHNIQUES AND APPLICATIONS

2018 ◽  
Vol 17 (2) ◽  
pp. 20
Author(s):  
C. F. da Silva ◽  
R. Z. Freire ◽  
N. Mendes
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Bibliometric Analysis ◽  
Energy Demand ◽  
Air Conditioning ◽  
Energy Savings ◽  
Control Strategies ◽  
Building Projects ◽  
Air Conditioning Systems ◽  
And Control

The world's energy demand has raised concerns about supply difficulties, depletion of natural resources and environmental impacts such as destruction of ozone layer, global warming, climate change, among others. Recent studies indicate that energy consumption in buildings represents more than 40% of the world's energy consumption, with more than half of that attributed to air conditioning systems. Specific regulations and control strategies for heating, ventilation and air-conditioning (HVAC) systems should provide acceptable thermal comfort and reasonable indoor air quality. The evolution of researches in these areas can be evaluated by the organization of scientific production up to now. The objective of this study is to analyze quantitatively what was produced in terms of optimization associated to both energy savings and thermal comfort in buildings. This bibliometric analysis, based on Science Direct and IEEE Xplore databases, correlates common adopted terms to quantify how optimization, especially those associated to computational intelligence, are influencing building projects where thermal comfort and energy saving are taken into account. This research assumes a sample of 76 articles, and provided a statistical evaluation considering authors identification, and both articles and journals that were more cited by researchers in this area.

scholarly journals HVAC Energy Saving Strategies for Public Buildings Based on Heat Pumps and Demand Controlled Ventilation

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5541
Author(s):  
Alessandro Franco ◽  
Lorenzo Miserocchi ◽  
Daniele Testi
Keyword(s):  
Energy Consumption ◽  
Energy Savings ◽  
Control Strategies ◽  
Residential Buildings ◽  
Heat Pumps ◽  
Air Conditioning System ◽  
Controlled Ventilation ◽  
Climatic Control ◽  
Educational Structures ◽  
Demand Controlled Ventilation

The paper analyzes and compares the perspectives for reducing the energy consumption associated to the operation of Heating Ventilation and Air Conditioning system for climatic control of large-size non-residential buildings. Three different control strategies are considered comparing the use of boiler and heat pumps as heating systems and analyzing the use of demand-controlled ventilation, operating on the effective occupancy of the building. The control strategies are applied to two different educational buildings with shapes representative of typical educational structures. The results of the analysis show how the energy consumption can be reduced up to 70%, shifting from the actual values of the energy intensity of over 300 kWh/m2 for year to values of less than 100 kWh/m2 per year. The significance of the energy savings achieved in such different buildings has led to the identification of a possible benchmark for HVAC systems in the next future years which could help reach the environmental targets in this sector.

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