Exergy analysis of renewable energy-based climatisation systems for buildings: A critical view

Torio, Herena; Angelotti, Adriana; Schmidt, Dietrich

doi:10.1016/j.enbuild.2008.10.006

Cited by 168 publications

(88 citation statements)

References 51 publications

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“…the boundary method that includes solar radiation and heat extracted from the ground). Readers are advised to consult Torío et al (2009) and Torío and Schmidt (2010) for more information about these methods.…”

Section: Overall Performancementioning

confidence: 99%

“…Instead, it is reframed as how useful are the units of energy in versus how useful are the units of energy out. Two comprehensive reviews on exergy analyses of the built environment, by Torío et al (2009) and Hepbasli (2012), identify the fact that exergy can be used to show what influence a modification of the process or the components has on the overall performance of the energy system. This potential can be better observed through the exergy method rather than through energy balances.…”

Section: Introductionmentioning

confidence: 99%

“…Exergy is the maximum work potential in an interaction between a system and its surrounding environment; if the system is in equilibrium with the environment, the exergy of the system is null (Hepbasli, 2012;Torío, Angelotti, & Schmidt, 2009). While energy is the most common approach to measure work, exergy offers information about the quality of the energy and whether it could be better exploited.…”

Section: Introductionmentioning

confidence: 99%

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Energy and exergy analysis of prosumers in hybrid energy grids

Delgado

Cao

Hasan

et al. 2017

Building Research & Information

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Surplus energy can be a recurrent phenomenon in zero-energy buildings (ZEBs) with onsite generation systems, usually resulting in the export of excess electricity. Yet, converting electricity into heat and exporting it could improve the overall energy balance. This study analyses the energy and exergy performance of a Finnish nearly zero-energy building (nZEB) as a heat and electricity prosumer, and proposes alternative energy topologies to improve energy and exergy levels, primary energy demand and CO 2 emissions. The results show that increasing the installed capacity of the photovoltaic systems would lead to zero energy, exergy, emissions and a balance of primary energy. However, by instead using the surplus electricity to drive a heat pump and export heat, the currently installed capacity would lead to a net energy export of over 4000 kWh/a. Thus, energy conversion could significantly enhance the contribution from heat and electricity prosumers to smart energy grids, though not without affecting other criteria. Two management strategies arise: favouring heat export improves the net energy and CO 2 emissions reduction but lessens the net exergy, while favouring electricity export improves the net exergy and primary energy reduction. The findings highlight that energy conversion can enhance nZEB performance and its exchange with hybrid grids.

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Section: Overall Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy and exergy analysis of prosumers in hybrid energy grids

Delgado

Cao

Hasan

et al. 2017

Building Research & Information

View full text Add to dashboard Cite

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“…The equations to incorporate this were based on a comprehensive review of exergy analysis for renewable-based systems undertaken by Torío et.al [46] and described in the calculation method in Appendix A.…”

Section: Exergy Analysis Of Renewable Systemsmentioning

confidence: 99%

An exergoeconomic-based parametric study to examine the effects of active and passive energy retrofit strategies for buildings

Kerdan

Raslan

Ruyssevelt

et al. 2016

Energy and Buildings

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The paper describes a systematic framework that uses exergoeconomic theory integrated into 'building energy retrofit' (BER) design. An exergoeconomic module, based on the SPECO method, has been embedded into 'EXRETOpt', a recently developed retrofit-oriented exergy simulation tool based on EnergyPlus. Both active and passive technologies were analysed using two calibrated archetype non-domestic buildings as case studies (an office and a primary school). A novel cost-benefit indicator which accounts for building exergy destruction cost, retrofit annual capital cost, and project annual revenue is presented. This indicator is employed to account for best exergoeconomic performance technologies and to further develop deep BER packages. Compared to typical practice, exergoeconomics combined with cost-benefit provides a powerful tool for exploration and design improvement of building energy systems. In both cases, final product cost for heating and cooling processes were substantially reduced. In addition, the office case presented improvements in energy use by 67%, CO2 emissions by 53%, thermal comfort by 22%, exergy destructions by 42%, and the overall building exergy efficiency was improved from 14.8% to 20.0%. The school case presented similar results with an improvement of building exergy efficiency from 8.2% to 11.1%, and the potential to generate income due to current government incentives.

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“…The impetus for this seemingly strange idea of supplying heat to the outside of a building came from the combination of research into low exergy systems [1][2][3][4][5][6], combined with a desire for high performance facades without excessive thickness. Based on the awareness of the disadvantages of very thick passive house walls [7], along with the need for thin renovation options, the ALEGIS concept was developed.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Use of Renewable Ground Heat for Insulation in Low Exergy Building Systems

Meggers¹,

Baldini

Leibundgut

2012

Energies

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Ground heat is a renewable resource that is readily available for buildings in cool climates, but its relatively low temperature requires the use of a heat pump to extract it for heating. We developed a system that uses low temperature ground heat directly in a building wall to reduce transmission heat losses. The Active Low Exergy Geothermal Insulation Systems (ALEGIS) minimizes exergy demand and maximizes the use of renewable geothermal heat from the ground. A fluid is pumped into a small pipe network in an external layer of a wall construction that is linked to a ground heat source. This decouples the building from the outside temperature, therefore eliminating large peak demands and reducing the primary energy demand. Our steady-state analysis shows that at a design temperature of −10 °C the 6 cm thick active insulation system has equivalent performance to 11 cm of passive insulation. Our comparison of heating performance of a building with our active insulation system versus a building with static insulation of the same thickness shows a 15% reduction in annual electricity demand, and thus exergy input. We present an overview of the operation and analysis of our low exergy concept and its modeled performance.

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Exergy analysis of renewable energy-based climatisation systems for buildings: A critical view

Cited by 168 publications

References 51 publications

Energy and exergy analysis of prosumers in hybrid energy grids

Energy and exergy analysis of prosumers in hybrid energy grids

An exergoeconomic-based parametric study to examine the effects of active and passive energy retrofit strategies for buildings

An Innovative Use of Renewable Ground Heat for Insulation in Low Exergy Building Systems

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