Energy Conservation and Storage Systems

2002 ◽  
Vol 20 (5) ◽  
pp. 391-399 ◽  
Author(s):  
Ayhan Demirbaş
Keyword(s):  
Energy Management ◽  
Thermal Energy ◽  
Waste Heat ◽  
Storage Systems ◽  
Electrical Energy ◽  
Thermal Storage ◽  
Energy Costs ◽  
Thermal Battery ◽  
Storage Technology ◽  
And Storage

In response to increasing electrical energy costs and the desire for better lad management, thermal storage technology has recently been developed. Storage of thermal energy in the form of sensible and latent heat has become an important aspect of energy management with the emphasis on efficient use and conservation of the waste heat and solar energy in industry and buildings. Thermal storage has been characterized as a kind of thermal battery.

Experimental Research of Energy Harvesting and Storage Based on Ferroelectric Materials

2012 ◽  
Vol 476-478 ◽  
pp. 1336-1340
Author(s):  
Kai Feng Li ◽  
Rong Liu ◽  
Lin Xiang Wang
Keyword(s):  
Energy Harvesting ◽  
Electromagnetic Waves ◽  
Vibrational Energy ◽  
Waste Heat ◽  
Mechanical Strain ◽  
Electrical Potential ◽  
Electrical Energy ◽  
Ferroelectric Materials ◽  
Energy Scavenging ◽  
And Storage

The concept of energy harvesting works towards developing self-powered devices that do not require replaceable power supplies. Energy scavenging devices are designed to capture the ambient energy surrounding the electronics and convert it into usable electrical energy. A number of sources of harvestable ambient energy exist, including waste heat, vibration, electromagnetic waves, wind, flowing water, and solar energy. While each of these sources of energy can be effectively used to power remote sensors, the structural and biological communities have placed an emphasis on scavenging vibrational energy with ferroelectric materials. Ferroelectric materials have a crystalline structure that provide a unique ability to convert an applied electrical potential into a mechanical strain or vice versa. Based on the properties of the material, this paper investigates the technique of power harvesting and storage.

scholarly journals Study of Hybrid PVA/MA/TEOS Pervaporation Membrane and Evaluation of Energy Requirement for Desalination by Pervaporation

2018 ◽  
Vol 15 (9) ◽  
pp. 1913 ◽  
Author(s):  
Zongli Xie ◽  
Derrick Ng ◽  
Manh Hoang ◽  
Jianhua Zhang ◽  
Stephen Gray
Keyword(s):  
Thermal Energy ◽  
Waste Heat ◽  
Energy Requirement ◽  
Electrical Power ◽  
Electrical Energy ◽  
Commercial Application ◽  
Heating And Cooling ◽  
Pervaporation Membrane ◽  
Multi Stage ◽  
Multiple Effect Distillation

Desalination by pervaporation is a membrane process that is yet to be realized for commercial application. To investigate the feasibility and viability of scaling up, a process engineering model was developed to evaluate the energy requirement based on the experimental study of a hybrid polyvinyl alcohol/maleic acid/tetraethyl orthosilicate (PVA/MA/TEOS) Pervaporation Membrane. The energy consumption includes the external heating and cooling required for the feed and permeate streams, as well as the electrical power associated with pumps for re-circulating feed and maintaining vacuum. The thermal energy requirement is significant (e.g., up to 2609 MJ/m3 of thermal energy) and is required to maintain the feed stream at 65 °C in recirculation mode. The electrical energy requirement is very small (<0.2 kWh/m3 of required at 65 °C feed temperature at steady state) with the vacuum pump contributing to the majority of the electrical energy. The energy required for the pervaporation process was also compared to other desalination processes such as Reverse Osmosis (RO), Multi-stage Flash (MSF), and Multiple Effect Distillation (MED). The electrical energy requirement for pervaporation is the lowest among these desalination technologies. However, the thermal energy needed for pervaporation is significant. Pervaporation may be attractive when the process is integrated with waste heat and heat recovery option and used in niche applications such as RO brine concentration or salt recovery.

Configurations selection maps of CO 2 -based transcritical Rankine cycle (CTRC) for thermal energy management of engine waste heat

2017 ◽  
Vol 186 ◽  
pp. 423-435 ◽  
Author(s):  
Gequn Shu ◽  
Lingfeng Shi ◽  
Hua Tian ◽  
Shuai Deng ◽  
Xiaoya Li ◽  
...  
Keyword(s):  
Energy Management ◽  
Thermal Energy ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Transcritical Rankine Cycle

Direct Thermoelectric Microgeneration Using Residual Heat of Photovoltaic System

2012 ◽  
Vol 608-609 ◽  
pp. 97-113 ◽  
Author(s):  
José Rui Camargo ◽  
Jamir Machado da Silva ◽  
Ederaldo Godoy Junior ◽  
Renan Eduardo da Silva ◽  
Luiz Eduardo Nicolini do Patrocínio Nunes ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Waste Heat ◽  
Electrical Power ◽  
Thermoelectric Module ◽  
Electrical Energy ◽  
Photovoltaic System ◽  
Prototype System ◽  
Theoretical Evaluation ◽  
Photovoltaic Panel ◽  
Influence Of Temperature

All photovoltaic panel heats up when exposed to sunlight and this heating reduces the electrical power output of the same. This work presents the use of this unwanted waste heat, converting it into thermal energy directly by means of the Seebeck effect, which is the direct conversion of thermal energy into electrical energy by means of an arrangement of semiconductor materials that when exposed to temperature gradients generate electric current. In this work emphasis was placed on the influence of temperature on generation processes involved. Thus, the theoretical evaluation, it presents the mathematical models of thermoelectric and photovoltaic systems by raising the curves of voltage, current and electric power generated, and analyses the influence of temperature in each model. To obtain the simulation curves it uses MATLAB ® 5.3, taking into account the parameters of thermoelectric modules and real photovoltaic cells. In practical evaluation, a prototype was assembled containing thermoelectric module attached to the bottom of a photovoltaic panel in order to use the heat energy absorbed by the panel. The data were stored and analyzed, where we observed the influence of temperature in both systems, validating the mathematical modeling. It is the applicability of the mathematical model given the results obtained with the prototype system.

Investigation of Reverse Thermosyphoning in an Indirect SDHW System

2009 ◽  
Author(s):  
Cynthia A. Cruickshank ◽  
Stephen J. Harrison
Keyword(s):  
Heat Exchanger ◽  
Thermal Energy ◽  
Reverse Flow ◽  
Numerical Models ◽  
Storage System ◽  
Thermal Storage ◽  
Relative Magnitude ◽  
Typical Day ◽  
Carry Over ◽  
And Storage

Thermal energy storages with thermosyphon natural convection heat exchangers have been used in solar water heating systems as a means of increasing tank stratification and eliminating the need for a second circulation pump. However, if the storage system is not carefully designed, under adverse pressure conditions, reverse thermosyphoning can result in increased thermal losses from the storage and reduced thermal performance of the system. To investigate this phenomenon, tests were conducted on a single tank and multi-tank thermal storage under controlled laboratory conditions. Energy storage rates and temperature profiles were experimentally measured during charge periods, and the effects of reverse thermosyphoning were quantified. A further aspect of this study was to empirically derive performance characteristics and to develop numerical models to predict the performance of the heat exchanger during reverse thermosyphon operation, and to quantify the relative magnitude of these effects on the energy stored during typical day-long charge periods. Results of this study show that the magnitude of the reverse flow rate depends on the pressure drop characteristics of the heat exchange loop, the system temperatures and the geometry of the heat exchanger and storage tank. In addition, the results show that in the case of a multi-tank thermal storage, the carry over of energy to the downstream thermal energy storages depend on the effectiveness of the exchangers used in the system.

scholarly journals Energy Management and Control of Photovoltaic and Storage Systems in Active Distribution Grids

2021 ◽  
pp. 1-1
Author(s):  
Lysandros Tziovani ◽  
Lenos Hadjidemetriou ◽  
Panayiotis Kolios ◽  
Alessandro Astolfi ◽  
Elias Kyriakides ◽  
...  
Keyword(s):  
Energy Management ◽  
Storage Systems ◽  
And Control ◽  
And Storage ◽  
Distribution Grids
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