ORCID Profile
0000-0003-0402-3456
Current Organisation
University of Tasmania
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Publisher: Springer Science and Business Media LLC
Date: 30-07-2018
Publisher: ASME International
Date: 26-05-2020
DOI: 10.1115/1.4047017
Abstract: This paper evaluates the energy source temperature for novel salts based ammonia/sodium thiocyanate (NH3 + NaSCN) and ammonia/lithium nitrate (NH3 + LiNO3) absorption refrigeration systems. Minimum energy source temperature (cutoff) required to initiate the cooling, critical energy source temperature for optimized thermodynamic performance and possible maximum energy source temperature to avoid crystallization have been determined, and empirical correlations are developed to facilitate continuous operation of the system. A comparison of cutoff energy source temperature depicts that the NH3 + NaSCN pair requires averagely 6 –7 °C higher cutoff temperature compared with the NH3 + LiNO3 pair. Contradictory to this, the maximum coefficient of performance (COP) of the NH3 + NaSCN pair is 7.02% higher than that the NH3 + LiNO3 pair. However, NH3 + NaSCN pair operates in a very narrow range of energy source temperature. From the P − T − X diagram, the crystallization phenomenon is clarified and the maximum energy source temperature has been determined beyond which the system would not function due to crystallization problems. For −10 °C evaporator temperature, the energy source temperature should be controlled between 87 °C and 115 °C for the NH3 + NaSCN pair and between 80 °C and 147 °C for the NH3 + LiNO3 pair.
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 09-2022
Publisher: Springer Singapore
Date: 04-09-2019
Publisher: Springer Science and Business Media LLC
Date: 12-2019
DOI: 10.1142/S2010132519500354
Abstract: The current study assesses the thermo-economic performance of a H 2 O[Formula: see text][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. H 2 O[Formula: see text][EMIM][DMP] could be an alternative to conventional LiBr[Formula: see text]H 2 O 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 10[Formula: see text]kW 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 H 2 O[Formula: see text][EMIM][DMP] absorption refrigeration system over FPC-based system.
Publisher: Springer Science and Business Media LLC
Date: 20-02-2021
DOI: 10.1142/S2010132521500073
Abstract: This research study compares the thermodynamic performance of 10[Formula: see text]kW lithium chloride–water (LiCl–H 2 O) and lithium bromide–water (LiBr–H 2 O) 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 ([Formula: see text]–[Formula: see text]–[Formula: see text] diagrams are drafted to clarify the real, ideal, and unavoidable cycles for LiCl–H 2 O and LiBr–H 2 O 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–H 2 O pair is 10% more efficient as compared to LiBr–H 2 O pair. Exergetically, LiBr–H 2 O cycle struggles with additional (nearly 13.45%) exergy destruction than LiCl–H 2 O 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.
Publisher: Springer Science and Business Media LLC
Date: 21-05-2019
Publisher: Elsevier BV
Date: 12-2023
Publisher: ASME International
Date: 26-03-2020
DOI: 10.1115/1.4046604
Abstract: This article compares the dynamic behavior of solar-assisted novel salt-based ammonia/sodium thiocyanate (NH3 + NaSCN) and ammonia/lithium nitrate (NH3 + LiNO3) single-effect absorption refrigeration cycles. An evacuated tube collector (ETC) is attached with fully mixed hot water storage tank to power the absorption system. Variations in ambient conditions are determined for Gujarat Region of India and their effects on absorption cycles are quantified throughout the days for the months of April to September. System performance is investigated and compared on terms of coefficient of performance (COP), refrigeration capacity, efficiency and solar COP (SCOP). At same operating conditions, it is found that the NH3 + LiNO3 cycle can achieve much lower evaporator temperature (−13.1 °C) then NH3 + NaSCN cycle (−7.5 °C) and maximum possible COP for NH3 + NaSCN cycle is 0.73 and 0.68 for NH3 + LiNO3 cycle. The working limit of NH3 + LiNO3 cycle is wide ranging and narrow for NH3 + NaSCN cycle due to high crystallization possibility. SCOP varies from 0.18 to 0.43 for NH3 + NaSCN cycle and 0.17 to 0.39 for NH3 + LiNO3 cycle over the period of 6 months. Based on these findings, the suitable working cycle is justified.
Publisher: ASME International
Date: 04-04-2019
DOI: 10.1115/1.4043249
Abstract: The present study compares the thermal performance of various alternative refrigerants with conventional refrigerant operating on a vapor compression cycle with energetic, exergetic, and advanced exergetic approaches. Appropriate alternative refrigerants are selected for the analysis, and R1234yf is recommended as the best suitable refrigerant to replace the existing refrigerants. By splitting the exergy destruction into endogenous and unavoidable, endogenous and avoidable, exogenous and unavoidable, and exogenous and avoidable parts, an advanced exergy method depicts the real potentials for the improvement in the thermal system. Moreover, a traditional exergy method prefers condenser for performance improvement as it has 18.48% higher exergy destruction than evaporator, whereas the advanced exergy method proposes evaporator rather than condenser since its endogenous and avoidable destruction part is 26.38% more than condenser for R1234yf refrigerant.
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: Springer Science and Business Media LLC
Date: 11-02-2020
Publisher: Hindawi Limited
Date: 12-02-2019
DOI: 10.1002/ER.4405
Location: India
Start Date: 2020
End Date: 2024
Funder: University of Tasmania
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