Emerging sorption pairs for heat pump applications: an overview

Saha, Bidyut Baran; Uddin, Kutub; Pal, Animesh; Thu, Kyaw

doi:10.1007/s42791-019-0010-4

Cited by 41 publications

(24 citation statements)

References 187 publications

(86 reference statements)

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“…Generally, isotherm data are correlated by applying various isotherm models where the bestfitted model is used to analyze the adsorption behavior. From the literature studies, it is found that different pairs exhibit different types of adsorption isotherms, and numerous authors had tried to get the best-fitted model for those [17]. Table 1 summarizes the different adsorption pairs with their isotherm type and the fitted model.…”

Section: Introductionmentioning

confidence: 99%

A Statistical Approach to Determine Optimal Models for IUPAC-Classified Adsorption Isotherms

et al. 2019

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Adsorption heat transformation (AHT) systems can play a major role in protecting our environment by decreasing the usage of fossil fuels and utilizing natural and alternative working fluids. The adsorption isotherm is the most important feature in characterizing an AHT system. There are eight types of International Union of Pure and Applied Chemistry (IUPAC) classified adsorption isotherms for different “adsorbent-adsorbate” pairs with numerous empirical or semi-empirical mathematical models to fit them. Researchers face difficulties in choosing the best isotherm model to describe their experimental findings as there are several models for a single type of adsorption isotherm. This study presents the optimal models for all eight types of isotherms employing several useful statistical approaches such as average error; confidence interval (CI), information criterion (ICs), and proportion tests using bootstrap sampling. Isotherm data of 13 working pairs (which include all eight types of IUPAC isotherms) for AHT applications are extracted from literature and fitted with appropriate models using two error functions. It was found that modified Brunauer–Emmet–Teller (BET) for Type-I(a) and Type-II; Tóth for Type-I(b); GAB for Type-III; Ng et al. model for Type-IV(a) and Type-IV(b); Sun and Chakraborty model for Type-V; and Yahia et al. model for Type-VI are the most appropriate as they ensure less information loss compared to other models. Moreover; the findings are affirmed using selection probability; overall; and pairwise proportion tests. The present findings are important in the rigorous analysis of isotherm data.

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Section: Introductionmentioning

confidence: 99%

A Statistical Approach to Determine Optimal Models for IUPAC-Classified Adsorption Isotherms

et al. 2019

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“…Among them, the achievable COP is remarkably lower compared to the vapor compression heat pumps dominating the market. Accordingly, several research activities are currently performed in order to overcome this limitation, especially investigating and developing advanced working pairs [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Coating Technologies for Adsorption Heat Pumps: A Review

2020

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The use of adsorbent heat pumps as heating and cooling systems is particularly relevant thanks to their ability to exploit low-grade heat (e.g., below 90 °C) from renewable energy sources and waste energy streams with prospective applications in several fields, e.g., industrial and residential. Their development began in the 20th century and is still in full evolution. The great interest in their improvement and optimization was determined by some key factors inherent to their sustainability compared to traditional refrigeration systems (e.g., low electricity consumption and the low environmental impact of the employed refrigerants). Recently, strong efforts have been dedicated to increasing the achievable heating/cooling power density of this technology through the development of innovative adsorbent coating technologies. Indeed, the deposition of thin coatings on the surface of the heat exchanger could reduce the heat transfer resistance existing on the adsorbent material side, thus increasing the overall adsorption dynamics. Three main approaches have been assessed, namely a thick consolidated bed, binder-based composite coatings and in situ directly crystallization coatings. This paper provides a brief overview of some of the main achievements related to adsorbent coating technology developments for adsorption heat pump applications.

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“…In order to increase the total energy utilization efficient, the application of thermal energy storage technologies, including sensible heat storage, latent heat storage, and chemical heat storage, have been extensively studied in the recent decades [1][2][3][4][5][6]. Chemical heat storage shows great advantages with following characteristics [3,4,6]: (1) Chemical heat storage can store and release heat with a relatively high energy density by reversible chemical reaction; (2) chemical heat storage can utilize waste heat during various temperature range by different reaction pairs and selected reaction conditions; and (3) thermal energy can be stored in chemical substances form without any heat loss. The long-term heat storage can be possible in chemical substance form; (4) the chemical heat storage can store and release heat at an arbitrary temperature depending on the reaction equilibrium temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

Lithium Hydroxide Reaction for Low Temperature Chemical Heat Storage: Hydration and Dehydration Reaction

Zeng

Kobayashi

et al. 2019

Energies

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As a key parameter of a chemical heat storage material, the hydration and dehydration reaction characteristics of lithium hydroxide (LiOH) at pure vapor condition is unclear. In this study, we focused on the hydration reaction and dehydration process of LiOH at the pure vapor condition. The pressure–temperature diagram of LiOH equilibrium was measured. The hydration and dehydration of LiOH at various conditions have been experimentally investigated. The results show that the steam diffusion can be greatly enhanced at vacuum condition. A thin layer of LiOH is uniformly dispersed in the reactor, which can greatly increase the heat transfer between the LiOH material and reactor, leading to a higher hydration reaction rate of LiOH. Furthermore, the steam pressure, reaction temperature, and the particle size of LiOH can greatly influence the hydration reaction. A maximum hydration reaction rate of 80% is obtained under the conditions of 47 °C, steam pressure of 9 kPa, and particle size of 32–40 μm. LiOH exhibits a different reaction property at the condition of pure steam without air and below atmospheric pressure. A store and reaction condition of LiOH with isolation of air is recommended when apply LiOH as a heat storage material at low temperature.

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Emerging sorption pairs for heat pump applications: an overview

Cited by 41 publications

References 187 publications

A Statistical Approach to Determine Optimal Models for IUPAC-Classified Adsorption Isotherms

A Statistical Approach to Determine Optimal Models for IUPAC-Classified Adsorption Isotherms

Recent Developments in Coating Technologies for Adsorption Heat Pumps: A Review

Lithium Hydroxide Reaction for Low Temperature Chemical Heat Storage: Hydration and Dehydration Reaction

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