Energy Efficiency and Performance Limiting Effects in Thermo-Osmotic Energy Conversion from Low-Grade Heat

2017 ◽  
Vol 51 (21) ◽  
pp. 12925-12937 ◽  
Author(s):  
Anthony P. Straub ◽  
Menachem Elimelech
Keyword(s):  
Energy Efficiency ◽  
Energy Conversion ◽  
Low Grade ◽  
And Performance ◽  
Low Grade Heat

Performance Study of Waste Heat Driven Pressurized Adsorption Chiller

2013 ◽  
Vol 315 ◽  
pp. 380-384
Author(s):  
Khairul Habib
Keyword(s):  
Heat Source ◽  
Waste Heat ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Low Grade ◽  
Performance Study ◽  
Adsorption Chiller ◽  
And Performance ◽  
Low Grade Heat ◽  
Adsorption Desorption

This article presents a transient modeling and performance of a waste heat driven pressurized adsorption chiller. This innovative adsorption chiller employs pitch based activated carbon of type Maxsorb III as adsorbent and R507A as refrigerant as adsorbent-refrigerant pair. This chiller utilizes low-grade heat source to power the cycle. A parametric study has been presented where the effects of adsorption/desorption cycle time, switching time and regeneration temperature on the performance are reported in terms of cooling capacity and coefficient of performance (COP). Results indicate that the adsorption chiller is feasible even when low-temperature heat source is available.

Flexible low-grade energy utilization devices based on high-performance thermoelectric polyaniline/tellurium nanorod hybrid films

2016 ◽  
Vol 4 (9) ◽  
pp. 3554-3559 ◽  
Author(s):  
Y. Wang ◽  
S. M. Zhang ◽  
Y. Deng
Keyword(s):  
Energy Conversion ◽  
High Performance ◽  
Low Cost ◽  
Energy Utilization ◽  
Low Grade ◽  
Thermoelectric Generation ◽  
Hybrid Films ◽  
Direct Energy ◽  
Low Grade Heat ◽  
Polymer Thermoelectric

Solution based polymer thermoelectric generation technologies provide a low-cost and eco-friendly means of direct energy conversion from low-grade heat to electricity.

scholarly journals A thermodynamic platform for evaluating the energy efficiency of combined power generation and desalination plants

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Kim Choon Ng ◽  
Muhammad Burhan ◽  
Qian Chen ◽  
Doskhan Ybyraiykul ◽  
Faheem Hassan Akhtar ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Efficiency ◽  
Power Plants ◽  
Flame Temperature ◽  
Primary Energy ◽  
Low Grade ◽  
Heat Engines ◽  
Desalination Plants ◽  
Low Grade Heat ◽  
Thermal Sources

AbstractIn seawater desalination, the energy efficiency of practical processes is expressed in kWh_electricity or low-grade-heat per m3 of water produced, omitting the embedded energy quality underlying their generation processes. To avoid thermodynamic misconceptions, it is important to recognize both quality and quantity of energy consumed. An unmerited quantitative apportionment can result in inferior deployment of desalination methods. This article clarifies misapprehensions regarding seeming parity between electricity and thermal sources that are sequentially cogenerated in power plants. These processes are represented by heat engines to yield the respective maximum (Carnot) work potentials. Equivalent work from these engines are normalized individually to give a corresponding standard primary energy (QSPE), defined via a common energy platform between the adiabatic flame temperature of fuel and the surroundings. Using the QSPE platform, the energy efficiency of 60 desalination plants of assorted types, available from literature, are compared retrospectively and with respect to Thermodynamic Limit.

A CoHCF system with enhanced energy conversion efficiency for low-grade heat harvesting

2019 ◽  
Vol 7 (41) ◽  
pp. 23862-23867 ◽  
Author(s):  
Jing Jiang ◽  
Hanqing Tian ◽  
Xinrui He ◽  
Qing Zeng ◽  
Yi Niu ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Low Grade ◽  
Cobalt Hexacyanoferrate ◽  
Low Grade Heat

Cobalt hexacyanoferrate (CoHCF) materials were used for TRECs; when complexed with HCNTs they show higher heat-to-electricity conversion efficiency.

scholarly journals Thermodynamic Analysis of Kalina Based Power and Cooling Cogeneration Cycle Employed Once Through Configuration

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1536 ◽  
Author(s):  
Kyoung Hoon Kim
Keyword(s):  
Energy Efficiency ◽  
Cooling Capacity ◽  
Maximum Energy ◽  
Low Grade ◽  
Absorption Refrigeration ◽  
Kalina Cycle ◽  
Cycle System ◽  
Heat Transfers ◽  
Low Grade Heat ◽  
Cogeneration Cycle

The Kalina cycle (KC) has been considered one of the most efficient systems for harvesting low grade heat since its proposal and various modifications have been proposed. Recently, Kalina based power and cooling cogeneration cycles (KPCCCs) have attracted much attention and many studies have been conducted. In this paper, a cogeneration cycle of power and absorption refrigeration based on the Kalina cycle system 11 (KCS-11) is proposed. The cycle combines a KC and aqua-ammonia absorption refrigeration cycle (ABR) with once through configuration. Compared to the stand-alone KC, the proposed cycle showed significantly higher energy efficiency—as high as 60%—without the use of rectifier, superheater or subcooler. Parametric analysis showed that the ammonia fraction, separator pressure and source temperature have a significant impact on the system performance including mass flow rates, heat transfers, power generation, cooling capacity, energy efficiencies and optimum ammonia fraction for the maximum energy efficiency.

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