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      저자 : Nishant Modi (검색결과 2 건)
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        Thermodynamic and Economic Contrast of an Ionic Solution Operated Solar Absorption Cooling System with LiBr + H_2O Pair for a Business Building in India

        Nishant Modi,Bhargav Pandya,Jovad Hosseinpour,Majid Amidpour 대한설비공학회 2019 International Journal of Air-Conditioning and Refr Vol.27 No.4

        The current study assesses the thermo-economic performance of a H2O+[EMIM][DMP] (1-ethyl-3-methylimidazolium dimethyl phosphate) working fluid-based absorption machine coupled with various solar collectors to cater the cooling load to business building at Gandhinagar city, India. H2O+[EMIM][DMP] could be an alternative to conventional LiBr+ H2O working fluid pair of absorption machines as it can operate without problem of crystallization which is perquisite for the continuous operation of the system. A mathematical model is developed to simulate the proposed system with 10kW cooling capacity at 5∘C. The sensitivity assessment is carried out to find the effect of various parameters including heat source temperature on the coefficient of performance (COP) and exergetic efficiency for each collector case. The optimum SCOP of parabolic trough collector (PTC)-based system is 11.43% higher compared to ETC-based system, whereas the ETC-based system is 25.10% economical than the PTC-based system. Furthermore, payback period for ETC-based system is only one month higher than FPC-based system, which altogether exhibits the superiority of ETC-coupled H2O+[EMIM][DMP] absorption refrigeration system over FPC-based system.

      • KCI등재

        Performance Enhancements in LiCl-H2O and LiBr-H2O Absorption Cooling Systems through an Advanced Exergetic Analysis

        Parth Mody,Jatin Patel,Nishant Modi,Bhargav Pandya 대한설비공학회 2021 International Journal of Air-Conditioning and Refr Vol.29 No.1

        This research study compares the thermodynamic performance of 10 kW lithium chloride–water (LiCl–H2O) and lithium bromide–water (LiBr–H2O) absorption cooling systems through first and second law of thermodynamics. Further, the exergy degradations happening in each component have been split into unavoidable and avoidable exergy degradations as well as endogenous and exogenous exergy degradations through advanced exergy analysis. Pressure–temperature–concentration (P–T –X) diagrams are drafted to clarify the real, ideal, and unavoidable cycles for LiCl–H2O and LiBr–H2O absorption cycles. Moreover, this paper exhibits the sensitivity of various system components towards the generator, condenser, and absorber temperature for both pairs. Energetic observation proves that LiCl–H2O pair is 10% more efficient as compared to LiBr–H2O pair. Exergetically, LiBr–H2O cycle struggles with additional (nearly 13.45%) exergy destruction than LiCl–H2O cycle. The major contribution (around 70% to 80%) of irreversibility comes from the generator and absorber. Comprehensively, the parametric partitions of irreversibility rate in each component provide broad indications to prioritize the system components for enhancements.

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