New Exergetic Methodology to Promote Improvements in nZEB

Picallo-Perez, Ana; Betanzos, Juan María Hidalgo; Jose-MariaSala-Lizarraga,

doi:10.5772/intechopen.73153

Cited by 2 publications

(3 citation statements)

References 32 publications

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“…Then, the exergy method can be implemented for design and optimization purposes, particularly in buildings. As an example, in reference [8] an exergetic methodology to promote improvements in buildings' thermal systems is explained. Accordingly, exergy application is especially interesting in buildings because different quality levels of energy [9] are mixed together to cover the energy demands.…”

Section: Exergy and Buildingsmentioning

confidence: 99%

“…However, this information is not enough to calculate the costs when the system has several products, as we need guidance for allocating these costs among the different products. Thermodynamic analysis allows calculation of the efficiency of each process, as well as location of the irreversibilities, but it cannot evaluate the effect of irreversibility throughout the production process in terms of costs [8].…”

Section: Exergy and Thermoeconomicsmentioning

confidence: 99%

“…The first is currently named Energy Audits, when the aim is to locate and quantify irreversibilities and then calculate the efficiencies of equipment. In [8] there is an example of cost accounting through a renovated facility.…”

Section: Thermoeconomics In Buildingsmentioning

confidence: 99%

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Application of Thermoeconomics in HVAC Systems

2020

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In order to achieve a sustainable society, the energy consumption in buildings must be reduced. The first step toward achieving this goal is to detect their weak points and analyze the energy-saving potential. to detect the units with higher consumption and cost. Exergy is very useful for analyzing pieces of equipment, systems or entire buildings. It measures not only the quantity of energy but also its quality. If the exergy is combined with economic analysis, this gives rise to thermoeconomics, and the system can be checked systematically and optimized from the perspective of economics. In this work, exergy methods and thermoeconomic analysis were applied to a building thermal system. Due to its complexity, it is necessary to adapt some concepts to translate the exergy application from industry to buildings. The purpose of this work is to overcome these shortcomings and to deal with energy-saving actions for buildings. To this end, a thermoeconomic study of a facility that covers the heating and domestic hot water (DHW) demands of 176 dwellings in Vitoria-Gasteiz (Basque Country) using two boilers and two cogeneration engines was analyzed. The irreversibility associated with each piece of equipment was quantified, and the costs associated with resources, investment and maintenance were calculated for each flow and, consequently, for the final flows, that is, electricity (11.37 c€/kWh), heating (7.42 c€/kWh) and DHW (7.25 c€/kWh). The results prove that the boilers are the lesser efficient components (with an exergy efficiency of 15%). Moreover, it is demonstrated that micro-cogeneration engines not only save energy because they have higher exergy efficiency (36%), but they are also economically attractive, even if they require a relatively high investment. Additionally, thermoeconomic costs provide very interesting information and underscore the necessity to adapt the energy quality in between the generation and demand.

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Section: Exergy and Buildingsmentioning

confidence: 99%

Section: Exergy and Thermoeconomicsmentioning

confidence: 99%