Strategies to Improve Solar Fraction in an Adsorption Cooling System Based on Metal Organic Frameworks in Humid and Dry Climates: A Case Study for Southeast and Southwest Texas

2016 ◽  
Author(s):  
Dervis Emre Demirocak ◽  
Bharath Kumar ◽  
Yashada Kolatkar
Keyword(s):  
Cooling System ◽  
Metal Organic Framework ◽  
El Paso ◽  
South Texas ◽  
Solar Fraction ◽  
Metal Organic ◽  
Dry Climates ◽  
Adsorption Cooling System ◽  
Family House

In this study, the performance of a solar-thermal powered adsorption cooling system based on HKUST-1-water (a type of metal organic framework) working pair for a detached single story family house located in two geographically diverse areas of South Texas was investigated. Using TRNSYS, the optimal system parameters such as collector area and chiller loop mass flow rate were determined to maximize the solar fraction of the cooling system. Based on the simulation results, it is possible to obtain monthly average solar fraction value of 0.7 or above during most of the cooling season (i.e., Apr to Nov) in both locations. For the same operating parameters, solar fraction in Kingsville, TX is slightly higher than the El Paso, TX.

Performance of a Solar Thermal Adsorption Cooling System Based on Metal Organic Frameworks in Texas

2016 ◽  
Author(s):  
Dervis Emre Demirocak ◽  
M. M. Kabir
Keyword(s):  
Cooling System ◽  
Metal Organic Framework ◽  
Integrated System ◽  
Solar Thermal ◽  
Adsorption Chiller ◽  
Solar Fraction ◽  
Water Based ◽  
Metal Organic ◽  
Adsorption Cooling System ◽  
Adsorption Cycle

In this study, the performance of the basic adsorption cooling system based on a metal organic framework, HKUST-1, is investigated and compared with that of a zeolite based system. The optimal regeneration temperature to maximize the COP of the HKUST-1-water based basic adsorption cycle is presented. The solar-thermal powered adsorption chiller model running on the HKUST-1-water based basic adsorption cycle is developed and integrated into a building model (two-story house located in Kingsville, Texas) in TRNSYS. The yearly performance of the integrated system is simulated by employing the latest typical meteorological year data (TMY3) for Kingsville, Texas. The solar fraction of the solar-assisted adsorption cooling system is also presented.

Metal-Organic Frameworks vs. Buffers: Case Study of UiO-66 Stability

2020 ◽  
Author(s):  
Daniel Bůžek ◽  
Slavomír Adamec ◽  
Kamil Lang ◽  
Jan Demel
Keyword(s):  
Inductively Coupled Plasma ◽  
Buffer Capacity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Analytical Techniques ◽  
Aqueous Dispersions ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Metal Organic

<div><p>UiO-66 is a zirconium-based metal-organic framework (MOF) that has numerous applications. Our group recently determined that UiO-66 is not as inert in aqueous dispersions as previously reported in the literature. The present work therefore assessed the behaviour of UiO-66 in buffers: 2-amino-2-(hydroxymethyl)-1,3-propanediol (TRIS), 4-(2-hydroxyethyl)piperazine-1-ethane sulfonic acid (HEPES), N-ethylmorpholine (NEM) and phosphate buffer (PB), all of which are commonly used in many UiO-66 applications. High pressure liquid chromatography and inductively coupled plasma mass spectrometry were used to monitor degradation of the MOF. In each buffer, the terephthalate linker was released to some extent, with a more pronounced leaching effect in the saline forms of these buffers. The HEPES buffer was found to be the most benign, whereas NEM and PB should be avoided at any concentration as they were shown to rapidly degrade the UiO-66 framework. Low concentration TRIS buffers are also recommended, although these offer minimal buffer capacity to adjust pH. Regardless of the buffer used, rapid terephthalate release was observed, indicating that the UiO-66 was attacked immediately after mixing with the buffer. In addition, the dissolution of zirconium, observed in some cases, intensified the UiO-66 decomposition process. These results demonstrate that sensitive analytical techniques have to be used to monitor the release of MOF components so as to quantify the stabilities of these materials in liquid environments.</p></div>

Analysis on solar energy powered cooling system based on desiccant coated heat exchanger using metal-organic framework

Energy ◽  
2019 ◽  
Vol 177 ◽  
pp. 211-221 ◽  
Author(s):  
F. Xu ◽  
Z.F. Bian ◽  
T.S. Ge ◽  
Y.J. Dai ◽  
C.H. Wang ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Solar Energy ◽  
Cooling System ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Organic Framework

Metal-Organic Frameworks vs. Buffers: Case Study of UiO-66 Stability

2020 ◽  
Author(s):  
Daniel Bůžek ◽  
Slavomír Adamec ◽  
Kamil Lang ◽  
Jan Demel
Keyword(s):  
Inductively Coupled Plasma ◽  
Buffer Capacity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Analytical Techniques ◽  
Aqueous Dispersions ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Metal Organic

<div><p>UiO-66 is a zirconium-based metal-organic framework (MOF) that has numerous applications. Our group recently determined that UiO-66 is not as inert in aqueous dispersions as previously reported in the literature. The present work therefore assessed the behaviour of UiO-66 in buffers: 2-amino-2-(hydroxymethyl)-1,3-propanediol (TRIS), 4-(2-hydroxyethyl)piperazine-1-ethane sulfonic acid (HEPES), N-ethylmorpholine (NEM) and phosphate buffer (PB), all of which are commonly used in many UiO-66 applications. High pressure liquid chromatography and inductively coupled plasma mass spectrometry were used to monitor degradation of the MOF. In each buffer, the terephthalate linker was released to some extent, with a more pronounced leaching effect in the saline forms of these buffers. The HEPES buffer was found to be the most benign, whereas NEM and PB should be avoided at any concentration as they were shown to rapidly degrade the UiO-66 framework. Low concentration TRIS buffers are also recommended, although these offer minimal buffer capacity to adjust pH. Regardless of the buffer used, rapid terephthalate release was observed, indicating that the UiO-66 was attacked immediately after mixing with the buffer. In addition, the dissolution of zirconium, observed in some cases, intensified the UiO-66 decomposition process. These results demonstrate that sensitive analytical techniques have to be used to monitor the release of MOF components so as to quantify the stabilities of these materials in liquid environments.</p></div>

scholarly journals Why conductivity is not always king – physical properties governing the capacitance of 2-D Metal-Organic Framework - based EDLC supercapacitor electrodes: Ni3(HITP)2 as a case study

2021 ◽  
Author(s):  
Michal Borysiewicz ◽  
Jinhu Dou ◽  
Ivo Stassen ◽  
Mircea Dinca
Keyword(s):  
Physical Properties ◽  
Systematic Study ◽  
Metal Organic Framework ◽  
Capacitive Behavior ◽  
Metal Organic ◽  
Organic Framework

We report a systematic study on the variation of physical properties of Ni3(HITP)2 (HITP = 2,3,6,7,10,11-hexeaiminotriphenylene) in the context of their influence on the capacitive behavior of this material in...

Electronic effects of ligand substitution on metal–organic framework photocatalysts: the case study of UiO-66

2015 ◽  
Vol 17 (1) ◽  
pp. 117-121 ◽  
Author(s):  
Lijuan Shen ◽  
Ruowen Liang ◽  
Mingbu Luo ◽  
Fenfen Jing ◽  
Ling Wu
Keyword(s):  
Photocatalytic Activity ◽  
Electronic Effect ◽  
Metal Organic Framework ◽  
Ligand Substitution ◽  
Electronic Effects ◽  
Metal Organic ◽  
Organic Framework

The electronic effect of the ligand substituents greatly affects the photocatalytic activity of UiO-66, the rates obtained by different substituents are linearly correlated with their Hammett coefficients.

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