Exergetic, energetic and financial evaluation of a solar driven absorption cooling system with various collector types

Bellos, Evangelos; Tzivanidis, Christos; Antonopoulos, K.A.

doi:10.1016/j.applthermaleng.2016.04.032

Cited by 162 publications

(59 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The heat exchanger efficiency is set to be 70% [21], a realistic value for usual absorption chillers. The heat loss coefficient from the tank to the environment is selected to be 0.5 W/m 2 K [18], which means an insulated tank. This heat loss coefficient includes convection and radiation losses.…”

Section: System Description and Assumptionsmentioning

confidence: 99%

“…The systems are examined energetically and exegetically in order to present a more detailed analysis. The optimization parameter is the heat source temperature, the temperature of hot water in the generator inlet, a methodology that has been also followed in many studies [15,17,18]. The suitable selection of heat source temperature maximizes the exergetic efficiency of the system and minimizes the demanded solar field area.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exergetic and energetic comparison of LiCl-H 2 O and LiBr-H 2 O working pairs in a solar absorption cooling system

Bellos

Tzivanidis

Antonopoulos

2016

Energy Conversion and Management

Self Cite

View full text Add to dashboard Cite

Section: System Description and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exergetic and energetic comparison of LiCl-H 2 O and LiBr-H 2 O working pairs in a solar absorption cooling system

Bellos

Tzivanidis

Antonopoulos

2016

Energy Conversion and Management

Self Cite

View full text Add to dashboard Cite

“…The working pair in this cycle is LiBr-H 2 O and the refrigerant is water/steam. A weak solution of low pressure (state point 1a) leaves the absorber and enters in the solution pump where its pressure is increased (state point 12a) with a relatively low electricity input which can be neglected [26,27] in the total system investigation. The next device in the system is the solution heat exchanger where the weak solution is warmed to state point 2a, while the strong solution from the generator (state point 4a) is cooled up to state point 45a.…”

Section: The Examined Configurationmentioning

confidence: 99%

Optimization of a Solar-Driven Trigeneration System with Nanofluid-Based Parabolic Trough Collectors

Bellos

Tzivanidis

2017

Energies

Self Cite

View full text Add to dashboard Cite

Abstract:The objective of this work was to optimize and to evaluate a solar-driven trigeneration system which operates with nanofluid-based parabolic trough collectors. The trigeneration system includes an organic Rankine cycle (ORC) and an absorption heat pump operating with LiBr-H 2 O which is powered by the rejected heat of the ORC. Toluene, n-octane, Octamethyltrisiloxane (MDM) and cyclohexane are the examined working fluids in the ORC. The use of CuO and Al 2 O 3 nanoparticles in the Syltherm 800 (base fluid) is investigated in the solar field loop. The analysis is performed with Engineering Equation Solver (EES) under steady state conditions in order to give the emphasis in the exergetic optimization of the system. Except for the different working fluid investigation, the system is optimized by examining three basic operating parameters in all the cases. The pressure in the turbine inlet, the temperature in the ORC condenser and the nanofluid concentration are the optimization variables. According to the final results, the combination of toluene in the ORC with the CuO nanofluid is the optimum choice. The global maximum exergetic efficiency is 24.66% with pressure ratio is equal to 0.7605, heat rejection temperature 113.7 • C and CuO concentration 4.35%.

show abstract

“…The overall exergetic efficiency of the solar cooling system ranged from 0.3% to 1.8% depending on the period of the year and on the weather conditions. A similar study was performed by Bellos et al [44]. By a simplified thermodynamic model of the absorption chiller considering generator, air water and absorber at constant temperature, they found that the exergy efficiency of the chiller varied from 26% to 36% depending on the boundary conditions (hot, cold and chilled streams temperatures).…”

Section: Introductionmentioning

confidence: 72%

“…However, when fluid temperature variation is considered exergy efficiency dramatically decreases [45]. In this study [44] solar collector exergetic efficiency varies from 2% to 3% whereas the overall system exergetic efficiency ranged from 3% to 5.5%.…”

Section: Introductionmentioning

confidence: 99%

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Calise

Libertini

Vicidomini

2016

Entropy

View full text Add to dashboard Cite

This paper presents a detailed exergetic analysis of a novel high-temperature Solar Assisted Combined Cycle (SACC) power plant. The system includes a solar field consisting of innovative high-temperature flat plate evacuated solar thermal collectors, a double stage LiBr-H 2 O absorption chiller, pumps, heat exchangers, storage tanks, mixers, diverters, controllers and a simple single-pressure Combined Cycle (CC) power plant. Here, a high temperature solar cooling system is coupled with a conventional combined cycle, in order to pre-cool gas turbine inlet air in order to enhance system efficiency and electrical capacity. In this paper, the system is analyzed from an exergetic point of view, on the basis of an energy-economic model presented in a recent work, where the obtained main results show that SACC exhibits a higher electrical production and efficiency with respect to the conventional CC. The system performance is evaluated by a dynamic simulation, where detailed simulation models are implemented for all the components included in the system. In addition, for all the components and for the system as whole, energy and exergy balances are implemented in order to calculate the magnitude of the irreversibilities within the system. In fact, exergy analysis is used in order to assess: exergy destructions and exergetic efficiencies. Such parameters are used in order to evaluate the magnitude of the irreversibilities in the system and to identify the sources of such irreversibilities. Exergetic efficiencies and exergy destructions are dynamically calculated for the 1-year operation of the system. Similarly, exergetic results are also integrated on weekly and yearly bases in order to evaluate the corresponding irreversibilities. The results showed that the components of the Joule cycle (combustor, turbine and compressor) are the major sources of irreversibilities. System overall exergetic efficiency was around 48%. Average weekly solar collector exergetic efficiency ranged from 6.5% to 14.5%, significantly increasing during the summer season. Conversely, absorption chiller exergy efficiency varies from 7.7% to 20.2%, being higher during the winter season. Combustor exergy efficiency is stably close to 68%, whereas the exergy efficiencies of the remaining components are higher than 80%.

show abstract

Exergetic, energetic and financial evaluation of a solar driven absorption cooling system with various collector types

Cited by 162 publications

References 30 publications

Exergetic and energetic comparison of LiCl-H 2 O and LiBr-H 2 O working pairs in a solar absorption cooling system

Exergetic and energetic comparison of LiCl-H 2 O and LiBr-H 2 O working pairs in a solar absorption cooling system

Optimization of a Solar-Driven Trigeneration System with Nanofluid-Based Parabolic Trough Collectors

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Contact Info

Product

Resources

About