Optimum dynamic operation of integrated absorption-compression refrigeration cycles and thermal energy storage systems for district cooling

Alexios-Spyridon Kyriakides; Athanasios I. Papadopoulos; Sambhaji KadamMuhammad Saad KhanIbrahim HassanPanos Seferlis

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Optimum dynamic operation of integrated absorption-compression refrigeration cycles and thermal energy storage systems for district cooling

机译：Optimum dynamic operation of integrated absorption-compression refrigeration cycles and thermal energy storage systems for district cooling

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A holistic approach is presented for the systematic assessment of the steady-state and dynamic performance of integrated absorption-compression refrigeration configurations that exploit thermal energy storage (TES). Thirteen configurations are evaluated including a dual vapor compression cycle (VCR), stand-alone single and double absorption refrigeration cycles (ABR) with two different working fluids (conventional NH_3/H_2O and novel acetaldehyde/DMF mixture), and their combinations thereof (VCR-ABR in parallel or cascaded configurations). The evaluation criteria combine steady-state performance metrics such as capital and energy cost, coefficient of performance (COP) and cooling water utilization, with dynamic operation indicators such as demand satisfaction, cooling and total energy utilities during transients between different operating levels. The dynamic operation optimization variables are the energy input per hour and the share of cooling output heading to each end-user. For all combined configurations, the resulting VCR cost is significantly lower compared to the nominal case of a dual VCR. The cascaded VCR-ABR configurations exhibit 241% higher VCR COP values than the nominal case. The latter also presents an average of 8.79% higher cooling water utilization than all the alternatives. The employment of TES enables the satisfaction of higher cooling demand than the cycle's nominal cooling capacity. ABR-equipped configurations satisfy the cooling demand 16.47% more effectively than the dual VCR. The latter is attributed to the ABR ability to operate in part load when at nominal efficiency, while presenting better dynamic cooling water use. The electricity requirements are reduced by 49% and 69% in the parallel and cascaded VCR-ABR configurations, compared to the nominal case.

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《Energy conversion & management》 |2022年第10期|116209.1-116209.17|共17页
作者
Alexios-Spyridon Kyriakides; Athanasios I. Papadopoulos; Sambhaji KadamMuhammad Saad KhanIbrahim HassanPanos Seferlis;
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作者单位

Chemical Process and Energy Resources Institute, Centre for Research and Technology Hellas, 57001 Thessaloniki, Greece;

Mechanical Engineering Department, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar;

Department of Mechanical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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Vapor compression cycle; Absorption refrigeration; Combined VCR-VAR cycle; Dynamic optimization;

Optimum dynamic operation of integrated absorption-compression refrigeration cycles and thermal energy storage systems for district cooling

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