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Increasing the <i>COP</i> of a refrigeration cycle in natural gas liquefaction process using refrigerant blends of Propane-NH<sub>3</sub>, Propane-SO<sub>2</sub> and Propane-CO<sub>2</sub>.

Heliyon · 2020 · PMC7452394 · PMID 32904166

Europe PMCDOI
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The sentences

an increasing trendno p-value reported
The COP of the ammonia-propane mixture shows an increasing trend for the mole fraction up to 60%.

also in 63,971 other papers

a decreasing trendno p-value reported
The COP of the carbon dioxide-propane mixture shows a decreasing trend for all mole fractions.

also in 47,180 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.