Solid-gas chemical heat pumps: Field of application and performance of the internal heat of reaction recovery process

Neveu, Pierre; Castaing, J.

doi:10.1016/0890-4332(93)90014-m

Cited by 171 publications

(68 citation statements)

References 8 publications

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“…This may be explained by the stronger mutual binding of the polar water and ammonia molecules, reducing the free volume and with that the entropy of the liquid state [25]. Figure 7 shows a collection of pT-lines of ammoniate transitions of chloride salts [11]. We extrapolated Neveu's plot to 1/T = 0, so that an apparent intersection of pT-lines around 1/T = 0 emerges, which is predicted by Trouton's rule (9) with Equation (4).…”

Section: Salt Ammoniatesmentioning

confidence: 99%

“…For instance, for the transition K 2 CO 3 ·(1 Fortunately, tables of ∆s 0 and ∆h 0 have been published for many salt hydration transitions [5,10,12], as well as for salt ammoniate transitions [11]. However, hydration states as well as ∆s 0 and ∆h 0 values of different references are sometimes contradictory, and hydration states are not always confirmed by X-ray diffraction data from, e.g., the online database of the ICDD (International Centre for Diffraction Data) [13].…”

mentioning

confidence: 99%

“…In literature, [10], pT-lines of salt hydrate transitions are often represented by the entropy and enthalpy differences ∆s 0 and ∆h 0 of the transition at reference pressure p 0 = 1 atm. The pT-line is then obtained by the relation [10,11] ln…”

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confidence: 99%

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Trouton’s Rule for Vapor Sorption in Solids

Jong

Fischer

2018

Applied Sciences

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Featured Application: A tool for the selection of the most suited material systems for (reversible) thermal heat storage with respect to the envisaged use cases. Temperatures of dehydration and rehydration are needed, as well as the heat storage density for the realization of heat batteries.Abstract: Hygroscopic salts exhibiting fast and reversible hydration are promising systems for seasonal heat storage, providing the possibility of storing excess solar energy from the warm season for later use during the cold season. For heat storage, the salt is dehydrated with the available heat, and for heat recovery, the salt is rehydrated. There are many salt hydration transitions and for selecting the most suited ones with respect to the envisaged use cases, temperatures of dehydration and rehydration are needed, as well as the heat storage density. Estimation of these properties requires entropy and enthalpy changes of the transitions. Collections of hydration entropies and enthalpies have been published, but not all data seems reliable for various reasons, and it is often hard to access original sources and experimental conditions. For the necessary data validation, we propose the use of Trouton's rule, known to hold for the evaporation of classes of fluids. Besides data validation, Trouton's rule is useful for predicting heat storage densities and vapor pressures when only the transition enthalpy is known. We discuss the validity of Trouton's rule for salt hydration and ammoniation transitions by theoretical and experimental evidence on the available extensive data collections.

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Section: Salt Ammoniatesmentioning

confidence: 99%

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confidence: 99%

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Trouton’s Rule for Vapor Sorption in Solids

Jong

Fischer

2018

Applied Sciences

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“…In the second step, by a proper change of the thermodynamic operating conditions, the transformations are reversed and the fluid flows back to the first reactor. The temperature level of the endothermal and exothermal effects can be adapted to the available source and users by a proper selection of the reactive salt and gas (Neveu et al, 1993).…”

Section: Thermochemical Processes For Transportation Of Thermal Energymentioning

confidence: 99%

Comparative assessment of processes for the transportation of thermal energy over long distances

Mazet¹,

Vallade²,

Neveu³

et al. 2012

Int. J. Thermo

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This papers deals with the transportation of thermal energy over long distances that could allow the recovery of waste heat from industrial sites. Processes involving thermochemical transformations can be relevant for such purpose as they involve the transportation of a reactive fluid at ambient temperature, and thus allow large distances between source and users. This paper aims to evaluate the performances of a thermochemical system designed for the transportation of thermal energy, and to compare it to classical processes devoted to the same purpose (involving electricity, coolant, slurry). A general method has been developed to assess the performances of all the paths of energy transportation. This paper is focused on the application of this methodology to cold utilities on the user site. The aim is to analyze the relevance of each process on the same basis. The exergy destruction in each part of these systems is analyzed and the exergy efficiencies are compared.Keywords: Thermochemical process; heat transportation over long distance; exergy. IntroductionIndustrial waste heat represents a huge amount of thermal energy, which is usually released several tens of kilometers away from potential users. The most obvious application is the recovery of this low temperature waste heat for distant heat and/or cold needs such as district heating, food-processing industry, etc. Therefore, the transportation of heat over long distances (over 10 km) represents a real scientific and technical challenge for a better and sustainable management of the energy resources.Several research projects are focused on this research area (Kugeler et al., 1975;Hoehlein et al., 1981;Zeng et al., 1992;Bach et al., 1998, Nasako et al., 1998Hasegawa et al., 1998;Liu et al., 2002;Stitou et al., 2002;Martin et al., 2006;Berthiaud et al., 2006;Le Pierrès et al., 2009; IEA-ECES-annex 18, 2010).A lot of them propose to implement a thermochemical process between the source and user sites, in order to replace the transportation of thermal energy by the transportation of an active fluid (a reactive gas for example). As the fluid is transported at ambient temperature, the thermal losses are low, and transportation over long distances can be considered.

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“…Some adsorption machines are already intoduced at the market [21][22][23][24][25][26][27]. Due to extremely high thermal conductivity conventional heat pipes are convenient to use as thermal management devices for adsorption machines like heat pumps, coolers and heat transformers.…”

Section: Two Adsorbers Heat Pumpmentioning

confidence: 99%

Application of sorption heat pumps for increasing of new power sources efficiency

Vasiliev¹,

Filatova²,

Tsitovich³

2010

Archives of Thermodynamics

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In the 21st century the way to increase the efficiency of new sources of energy is directly related with extended exploration of renewable energy. This modern tendency ensures the fuel economy needs to be realized with nature protection. The increasing of new power sources efficiency (cogeneration, trigeneration systems, fuel cells, photovoltaic systems) can be performed by application of solid sorption heat pumps, regrigerators, heat and cold accumulators, heat transformers, natural gas and hydrogen storage systems and efficient heat exchangers.

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Solid-gas chemical heat pumps: Field of application and performance of the internal heat of reaction recovery process

Cited by 171 publications

References 8 publications

Trouton’s Rule for Vapor Sorption in Solids

Trouton’s Rule for Vapor Sorption in Solids

Comparative assessment of processes for the transportation of thermal energy over long distances

Application of sorption heat pumps for increasing of new power sources efficiency

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