Biography:

In the past Moonis R. Ally has collaborated on articles with Kashif Nawaz. One of their most recent publications is Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative studyAnalyse exergétique de moteurs fonctionnant à l'électricité et à la chaleur pour les pompes à chaleur : étude comparative exhaustive☆. Which was published in journal International Journal of Refrigeration.

More information about Moonis R. Ally research including statistics on their citations can be found on their Copernicus Academic profile page.

Moonis R. Ally's Articles: (5)

Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative studyAnalyse exergétique de moteurs fonctionnant à l'électricité et à la chaleur pour les pompes à chaleur : étude comparative exhaustive☆

Highlights•Compares electrically- and thermally-driven heat engines to drive heat pumps.•Determines which engine may be a better choice for a given application.•Detailed energy and exergy analysis to support the conclusions.•Extensive cross checks of the results from analysis.

Options for low-global-warming-potential and natural refrigerants Part 2: Performance of refrigerants and systemic irreversibilitiesOptions de frigorigènes naturels à faible potentiel de réchauffement planétaire 2nde partie: Performance des frigorigènes et irréversibilités systémiques

AbstractThere is growing interest in substituting existing refrigerants with low global warming potential (GWP) refrigerants, including naturally occurring fluids, to reduce the impact of human activities on climate change. In the Part I of the study, we examined 13 refrigerants from the perspective of the characteristic shape of their respective temperature–entropy (T–S) and the logarithm of the pressure versus inverse absolute temperature (log P vs. T−1) phase boundary. In Part 2, we are evaluating prospective low-GWP refrigerants in four distinct heat pump cycles using the First and Second Laws of thermodynamics. The essence of the study is to establish the performance of the low-GWP refrigerants when deployed in a heat pump system. Exergy analysis provides a true measure of lost work, or systemic inefficiencies, vividly quantifying areas of improvement and identifying the preferred cycle for a refrigerant. The combined knowledge of the properties of the phase boundary on either side of the critical point, and exergy analysis of prospective cycles is necessary for a better perspective on discriminating among refrigerants as hydrochlorofluorocarbons are phased out and replacement refrigerants must be found.

Exergy analysis of a two-stage ground source heat pump with a vertical bore for residential space conditioning under simulated occupancy☆

Highlights•Exergy and energy analysis of a vertical-bore ground source heat pump over a 12-month period is presented.•The ground provided more than 75% of the heating energy.•Performance metrics are presented.•Sources of systemic inefficiency are identified and prioritized using Exergy analysis.•Understanding performance metrics is vital for judicial use of renewable energy.

Predicting phase diagram of the CaCl2·H2O binary system from the BET adsorption isotherm

AbstractThe statistical mechanical description of multilayer adsorption culminating in the Brunauer–Emmet–Teller (BET) adsorption isotherm for aqueous electrolytes as developed by Ally and Braunstein [M.R. Ally and J. Braunstein, Fluid Phase Equilibria. 87 (2) (1993) 213–236] is used to predict the liquidus behavior of CaCl2·H2O across the entire composition range (from the melting point of pure water to the melting point of anhydrous calcium chloride), including possible metastable crystalline phases. The method requires as input the two BET parameters r, the statistically averaged number of adsorption sites and ɛ, the energy of adsorption of water in excess of the energy of condensation of pure water. Usually it suffices to keep r and ɛ constant, typically evaluated at 298.15 K, but in the case of CaCl2·H2O, it is found that both r and ɛ must be considered temperature dependent in order to predict the liquidus curve, eutectic and peritectic points with reasonable accuracy over the large temperature and compositional range for this binary system. The theory and methodology in this paper enables detailed predictions of liquidus curves over much wider temperature and composition ranges than that reported by an alternate method [D. Zeng, H. Zhou,W. Voigt, Fluid Phase Equilibria 253 (2007) 1–11].

Letter to EditorLetter to The Editor: Rebuttal to “Comments to the paper, Variability of absorption heat pump efficiency for domestic water heating and space heating based on time-weighted bin analysis”

AbstractThis rebuttal in the form of a letter to the Editor is prepared by the corresponding author of the paper, “Variability of absorption heat pump efficiency for domestic water heating and space heating based on time-weighted bin analysis, Applied Thermal Engineering, Volume 130, 5 February 2018, 515–527. https://orproxy.lib.utk.edu:2113/10.1016/j.applthermaleng.2017.10.142” in response to the “concerns“ sent to the Editor by Dr. Chris Keinath and Mr. Michael Garrabrant of Stone Mountain Technologies, Inc., (SMTI) Johnson City, TN.

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