Dynamic Model For Small Capacity Ammonia Water Absorption Chiller
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Dynamic Model For Small Capacity Ammonia Water Absorption Chiller
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Author : Vinodh Kumar Viswanathan
language : en
Publisher:
Release Date : 2013
Dynamic Model For Small Capacity Ammonia Water Absorption Chiller written by Vinodh Kumar Viswanathan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Air conditioning categories.
Optimization of the performance of absorption systems during transient operations such as start-up and shut-down is particularly important for small-capacity chillers and heat pumps to minimize lifecycle costs. Dynamic models in the literature have been used to study responses to step changes in a single parameter, but more complex processes such as system start-up have not been studied in detail. A robust system-level model for simulating the transient behavior of an absorption chiller is developed here. Individual heat and mass exchangers are modeled using detailed segmental models. The UA-values and thermal masses of heat exchangers used in the model are representative of a practical operational chiller. Thermal masses of the heat exchangers and energy storage in the heat exchanging fluids are accounted for to achieve realistic transient simulation of the heat transfer processes in the chiller. The pressure drop due to fluid flow across the heat exchangers is considered negligible in comparison to the pressure difference between the high- and low-side components (~ 1.5 MPa). In components with significant mass transfer effects, reduced-order models are employed to decrease computational costs while also maintaining accurate system response. Mass and species storage in the cycle are modeled using storage devices. The storage devices account for expansion and contraction of the refrigerant and solution in the cycle as the system goes through start-up, shut-down, and other transient events. A counterflow falling film desorber model is employed to account for the heat and mass transfer interactions between the liquid and vapor phases, inside the desorber. The liquid film flows down counter to the rising vapor, thereby exchanging heat with the counterflowing heated coupling fluid. A segmented model is used to account for these processes, and a solver is developed for performing rapid iteration and quick estimation of unknown vapor and liquid states at the outlet of each segment of the desorber. Other components such as the rectifier, expansion valves and solution pump are modeled as quasi-steady devices. System start-up is simulated from ambient conditions, and the coupling fluid temperatures are assumed to start up to their steady-state values within the first 90 s of simulation. It is observed that the system attains steady-state in approximately 550 s. The evaporator cooling duty and COP of the chiller during steady-state are observed to be 3.41 kW and 0.60, respectively. Steady-state parameters such as flow rates, heat transfer rates and concentrations are found to match closely with results from simulations using corresponding steady-state models. Several control responses are investigated using this dynamic simulation model. System responses to step changes in the desorber coupling fluid temperature and flow rate, solution pumping rate, and valve setting are used to study the effects of several control strategies on system behavior. Results from this analysis can be used to optimize start-up and steady state performances. The model can also be used for devising and testing control strategies in commercial applications.
Exergy For A Better Environment And Improved Sustainability 2
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Author : Fethi Aloui
language : en
Publisher: Springer
Release Date : 2018-08-22
Exergy For A Better Environment And Improved Sustainability 2 written by Fethi Aloui and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-22 with Technology & Engineering categories.
This multi-disciplinary book presents the most recent advances in exergy, energy, and environmental issues. Volume 2 focuses on applications and covers current problems, future needs, and prospects in the area of energy and environment from researchers worldwide. Based on selected lectures from the Seventh International Exergy, Energy and Environmental Symposium (IEEES7-2015) and complemented by further invited contributions, this comprehensive set of contributions promote the exchange of new ideas and techniques in energy conversion and conservation in order to exchange best practices in "energetic efficiency". Applications are included that apply to the green transportation and sustainable mobility sectors, especially regarding the development of sustainable technologies for thermal comforts and green transportation vehicles. Furthermore, contributions on renewable and sustainable energy sources, strategies for energy production, and the carbon-free society constitute an important part of this book. Exergy for Better Environment and Sustainablity, Volume 2 will appeal to researchers, students, and professionals within engineering and the renewable energy fields.
Dynamic Modeling And Simulation Of Two Bed Silicagel Water Adsorption Chiller
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Author : Nasruddin
language : en
Publisher:
Release Date : 2006
Dynamic Modeling And Simulation Of Two Bed Silicagel Water Adsorption Chiller written by Nasruddin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Absorption Chillers And Heat Pumps
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Author : Keith E. Herold
language : en
Publisher: CRC Press
Release Date : 2016-04-21
Absorption Chillers And Heat Pumps written by Keith E. Herold and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-21 with Science categories.
Significantly revised and updated since its first publication in 1996, Absorption Chillers and Heat Pumps, Second Edition discusses the fundamental physics and major applications of absorption chillers. While the popularity of absorption chillers began to dwindle in the United States in the late 1990's, a shift towards sustainability, green buildin
Solar Cooling Technologies
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Author : Sotirios Karellas
language : en
Publisher: CRC Press
Release Date : 2018-10-03
Solar Cooling Technologies written by Sotirios Karellas and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-03 with Technology & Engineering categories.
Solar Cooling Technologies presents a detailed study of the potential technologies for coupling solar energy and cooling systems. Unifies all the various power based solar techniques into one book, investigates tri-generation schemes for maximization of cooling efficiency, especially for small scale applications and offers direct comparison of all possible technologies of solar cooling Includes detailed numerical investigations for potential cooling applications
Dynamic Modeling And Capacity Control Of Multiple Chiller Systems
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Author : Yang Guan
language : en
Publisher:
Release Date : 2005
Dynamic Modeling And Capacity Control Of Multiple Chiller Systems written by Yang Guan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
The Thermodynamic Modeling Of An Absorption Chiller By Verifying Ammonia Water Properties
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Author : Yong Wei Zhang
language : en
Publisher:
Release Date : 2000
The Thermodynamic Modeling Of An Absorption Chiller By Verifying Ammonia Water Properties written by Yong Wei Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Energy
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Author :
language : en
Publisher:
Release Date : 1981
Energy written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Fuel categories.
Bulletin De L Institut International Du Froid
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Author :
language : en
Publisher:
Release Date : 2009
Bulletin De L Institut International Du Froid written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Refrigeration and refrigerating machinery categories.
The Aun Seed Net Joint Regional Conference In Transportation Energy And Mechanical Manufacturing Engineering
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Author : Anh-Tuan Le
language : en
Publisher: Springer Nature
Release Date : 2022-05-31
The Aun Seed Net Joint Regional Conference In Transportation Energy And Mechanical Manufacturing Engineering written by Anh-Tuan Le and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-05-31 with Technology & Engineering categories.
This book (The AUN/SEED-Net Joint Regional Conference in Transportation, Energy, and Mechanical Manufacturing Engineering) gathers selected papers submitted to the 14th Regional Conference in Energy Engineering and the 13th Regional Conference in Mechanical Manufacturing Engineering in the fields related to intelligent equipment, automotive engineering, mechanical systems and sustainable manufacturing, renewable energy, heat and mass transfer. Under the theme of “Integration and Innovation for Sustainable Development,” This book consists of papers in the aforementioned fields presented by researchers and scientists from universities, research institutes, and industry showcasing their latest findings and discussions with an emphasis on innovations and developments in embracing the new norm, resulting from the COVID-19 pandemic.