Analysis of chemical heat pumps (CHPs): Basic concepts and numerical model description

Mbaye, M.; Aidoun, Zine; Val'kov, V. D.; Legault, A.

doi:10.1016/s1359-4311(97)00027-6

Cited by 43 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sources of low temperature heat are industrial heat waste, solar energy, dryer exhaust, geothermal energy, etc. 49 The working principle of CHP comprises adsorption/synthesis/production and desorption/regeneration/decomposition. The synthesis stage is the cold production stage, which is followed by the regeneration stage, during which decomposition takes place.…”

Section: Chemical Heat Pump Drying Systemmentioning

confidence: 99%

A review on opportunities for the development of heat pump drying systems in South Africa

Kivevele

Huan

2014

S. Afr. J. Sci.

View full text Add to dashboard Cite

Recently, it has been discovered that heat pump drying is an efficient method of drying for drying industries. Heat pumps deliver more heat during the drying process than the work input to the compressor. Heat pump drying is a more advanced method than the traditional South African industrial and agricultural drying methods, such as direct/indirect sunlight, wood burning, fossil fuel burning, electrical heating and diesel engine heating. Heat pump dryers provide high energy efficiency with controllable temperature, air flow and air humidity and have significant energy-saving potential. In the last decade the market for heat pump systems for water heating and space cooling/heating has grown in South Africa, but the development of heat pumps for industrial and agricultural drying is very slow. As a result of high increases in fossil fuel prices and electricity in South Africa, as well as the problem of CO 2 emissions, green energy, energy saving and energy efficiency are imperative. The development of heat pump drying systems in South Africa is an efficient way to solve energy problems in drying applications as this technology is still in its infancy. We review studies on heat pump drying and compare the methods therein with the most common methods of drying in South Africa.

show abstract

Section: Chemical Heat Pump Drying Systemmentioning

confidence: 99%

A review on opportunities for the development of heat pump drying systems in South Africa

Kivevele

Huan

2014

S. Afr. J. Sci.

View full text Add to dashboard Cite

show abstract

“…No decomposition was apparent either from pH paper over the effluent of the vessel or in a color change from pink (MnCl 2 ·H 2 O) to green (MnO). The study of MnCl 2 was included in the development of many absorbents over the recent decades for thermal energy storage, [ 39,40 ] however it has heretofore been ignored in ammonia separation [ 5 ] because the importance of its unique characteristics in relation to water and ammonia has not been recognized.…”

Section: Resultsmentioning

confidence: 99%

Exceeding Single‐Pass Equilibrium with Integrated Absorption Separation for Ammonia Synthesis Using Renewable Energy—Redefining the Haber‐Bosch Loop

Smith

Torrente‐Murciano

2021

Advanced Energy Materials

View full text Add to dashboard Cite

The synthesis of ammonia through the Haber‐Bosch process has been at the foundation of the chemical industry for over 100 years, but when the energy and feedstock sources switch from fossil fuels to renewable electricity, the process needs to be reimagined. Herein, the successful integration of ammonia synthesis and separation is demonstrated in a recycle‐less process setting the foundations of green ammonia technology. The ruthenium‐based catalyst uses a nanostructured CeO2 support and Cs electronic promotion to remove hydrogen and ammonia inhibition, respectively, creating a catalyst with low‐temperature (<300 °C) activity that quickly approaches equilibrium. The absorbent uses MnCl2 to avoid the acid releasing decomposition of conventional absorbents like MgCl2, and a support of SiO2 to simultaneously enhance MnCl2 dispersion and improve stabilization. This integrated catalyst‐absorbent system reproducibly exceeds single‐pass ammonia synthesis equilibrium. Kinetic models of the catalyst and absorbent successfully predict the experimental long‐term behavior and facilitate the design of an integrated system. These results present a framework for aligning intermittent and isolated renewable energy with ammonia synthesis by decreasing capital complexity and increasing process agility—adapting to a shifting energy landscape to continue providing fertilizers with minimum CO2 penalty and pioneer energy storage.

show abstract

“…Work in our laboratory suggested that for the decomposition reaction, the rate-controlling step is the rate of heat transfer to the salt (Mbaye et al, 1998). In contrast, other numerical modeling studies (Mbaye and Aidoun, 1997) indicated that for the synthesis reaction, the rate of heat transfer to the salt did not control the rate.…”

Section: Introductionmentioning

confidence: 83%

The unsteady state overall heat transfer coefficient in a chemical heat pump reactor: the NH3–CoCl2

Aidoun

Ternan²

2004

Chemical Engineering Science

View full text Add to dashboard Cite

Analysis of chemical heat pumps (CHPs): Basic concepts and numerical model description

Cited by 43 publications

References 10 publications

A review on opportunities for the development of heat pump drying systems in South Africa

A review on opportunities for the development of heat pump drying systems in South Africa

Exceeding Single‐Pass Equilibrium with Integrated Absorption Separation for Ammonia Synthesis Using Renewable Energy—Redefining the Haber‐Bosch Loop

The unsteady state overall heat transfer coefficient in a chemical heat pump reactor: the NH3–CoCl2

Contact Info

Product

Resources

About