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Shirazi, Ali; Taylor, Robert A.; White, Stephen D.; Morrison, Graham L., E-mail: a.shirazi@unsw.edu.au2016
AbstractAbstract
[en] Highlights: • TRNSYS simulations of SHC single/multi-effect absorption chillers were conducted. • A detailed parametric study was conducted to find the optimal size of the tank. • The effect of tank heat loss on the performance of the configurations was analyzed. • The effect of beam and diffuse radiation on the solar field size was investigated. • Energy performance and economics of each plant were analyzed in various climates. - Abstract: The present work investigates the feasibility of solar heating and cooling (SHC) absorption systems based on combining three types of LiBr–H_2O absorption chillers (single-, double-, and triple-effect) with common solar thermal collectors available on the market. A single-effect chiller is coupled with evacuated tube collectors (ETCs) – SHC1. A double-effect chiller is integrated with parabolic trough collectors (PTCs), linear Fresnel micro-concentrating collectors (MCTs) and evacuated flat plate collectors (EFPCs) respectively – SHC2, SHC3, and SHC4. PTCs are employed to provide high-temperature heat to a triple-effect absorption chiller (SHC5). Although triple-effect chillers have been around for a while, this paper represents the first system-level analysis of these chillers coupled with high-temperature solar concentrating collectors for air-conditioning applications. A simulation model for each configuration is developed in a transient system simulation environment (TRNSYS 17). Furthermore, a unique, comprehensive perspective is given by investigating the impact of characteristic solar beam radiation to global radiation ratios on the techno-economic performance of the proposed SHC plants for a wide variety of climatic regions worldwide. The results of parametric study suggest that a storage volume of around 70 L/m"2 is a good choice for SHC1, while 40–50 L/m"2 storage capacity is sufficient for the other configurations (SHC2 to SHC5). The simulation results reveal that when the fraction of direct normal irradiance (DNI) is less than 50%, SHC2, SHC3, and SHC5 require larger collector area compared to SHC1, showing there is no advantage in using concentrating collector powered multi-effect chillers over solar single-effect chillers in climates with low DNI level. However, in climates with DNI fractions above 60%, the smallest solar field is achieved by SHC5, followed by SHC2. SHC4, which benefits from both relatively high COP of double-effect chiller and the diffuse component in the solar field, results in the most reasonable trade-off between energetic and economic performance of the system in a wide range of climatic conditions.
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S0196-8904(16)30014-0; Available from http://dx.doi.org/10.1016/j.enconman.2016.01.070; Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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ABSORPTION, AIR CONDITIONING, CAPACITY, COMPARATIVE EVALUATIONS, COMPUTERIZED SIMULATION, COOLING, ECONOMICS, ENERGY STORAGE, EVACUATED TUBE COLLECTORS, FLAT PLATE COLLECTORS, HEAT LOSSES, LITHIUM BROMIDES, PARABOLIC TROUGH COLLECTORS, PARAMETRIC ANALYSIS, PERFORMANCE, RADIANT FLUX DENSITY, SOLAR HEATING, SOLAR POWER PLANTS
ALKALI METAL COMPOUNDS, BROMIDES, BROMINE COMPOUNDS, CONCENTRATING COLLECTORS, ENERGY LOSSES, ENERGY TRANSFER, EQUIPMENT, EVACUATED COLLECTORS, EVALUATION, FLUX DENSITY, HALIDES, HALOGEN COMPOUNDS, HEAT TRANSFER, HEATING, LITHIUM COMPOUNDS, LITHIUM HALIDES, LOSSES, PARABOLIC COLLECTORS, POWER PLANTS, SIMULATION, SOLAR COLLECTORS, SOLAR EQUIPMENT, SORPTION, STORAGE
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