Estimation of primary energy savings by using heat pumps for heating purposes in the residential sector

Bianco, Vincenzo; Scarpa, Federico; Tagliafico, Luca A.

doi:10.1016/j.applthermaleng.2016.12.058

Cited by 63 publications

(39 citation statements)

References 23 publications

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“…To evaluate the prognostic potential of the developed heat transfer model in a typical heat supply object two significantly different approaches, fig. 8, namely a traditional balance approach [21][22][23] and an approach based on a system of eqs. (1)- (4) and 7- (12), were compared.…”

Section: Resultsmentioning

confidence: 99%

Prognostic potential of free convection models for analysis of thermal conditions of heat supply objects

2018

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The article shows the results of mathematical simulation of convective turbulent heat transfer in the closed domain with heat-conducting walls and the source of heat emission. The system of equations in the model of thermal conductivity for the solid walls and Navier-Stokes equations for gas are solved. The article examines the possible versions of the calculation of the turbulent regime in the geometrically simple air region by means of conducting the simulation within the framework of algebraic models (Van Driest and Prandtl-Reichardt), and k-ε model. On the basis of the obtained results the authors made a conclusion about the possibility of applying the algebraic model of Prandtl to describe the integral characteristics of turbulent flows in the conditions of natural convection in a geometrically simple area when the air heated by the heat source is moved by the lifting force. Besides, the temperature fields for a typical real object of heat supply are simulated in the article. The values of the dimensionless heat exchange coefficient at the air-wall interface are determined. The comparative analysis of two quite significantly different approaches to determine the average temperature in the heated room, i. e. the traditional balance approach and the approach based on the considered system of partial differential equations is executed. It is concluded that the balance models of the calculation of the temperature regime can adequately describe real temperatures of heat supply objects only for very large values of the characteristic times of the processes in question.

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Section: Resultsmentioning

confidence: 99%

Prognostic potential of free convection models for analysis of thermal conditions of heat supply objects

2018

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“…Yet such a market is not sustainable from an environmental point of view. In this instance, according to EU Regulations [2,3], heat pumps come forward as an increasingly important player because they represent one of the main solutions in the direction to use more renewable energy for heating and cooling [4]. However, the application of Ground Source installations in the built environment is not well developed [5].…”

Section: Introductionmentioning

confidence: 99%

Energetic and Exergetic Analysis of Low Global Warming Potential Refrigerants as Substitutes for R410A in Ground Source Heat Pumps

et al. 2019

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In the European Union (EU), buildings are responsible for about 40% of the total final energy consumption, and 36% of the European global CO2 emissions. The European Commission released directives to push for the enhancement of the buildings energy performance and identified, beside the retrofit of the current building stock, Heating, Ventilation, and Air Conditioning (HVAC) systems as the other main way to increase renewable energy sharing and overall building energy efficiency. For this purpose, Ground Source Heat Pumps (GSHPs) represent one of the most interesting technologies to provide energy for heating, cooling, and domestic water production in residential applications, ensuring a significant reduction (e.g., up to 44% compared with air-source heat pumps) of energy consumption and the corresponding emissions. At present, GSHPs mainly employ the refrigerant R410A as the working fluid, which has a Global Warming Potential (GWP) of 2087. However, following the EU Regulation No. 517/2014 on fluorinated greenhouse gases, this high GWP refrigerant will have to be substituted for residential applications in the next years. Thus, to increase the sustainability of GSHPs, it is necessary to identify short time alternative fluids with lower GWP, before finding medium-long term solutions characterized by very low GWP. This is one of the tasks of the UE project "Most Easy, Efficient, and Low-Cost Geothermal Systems for Retrofitting Civil and Historical Buildings" (acronym GEO4CIVHIC). Here, a thorough thermodynamic analysis, based on both energy and exergy analysis, will be presented to perform a comparison between different fluids as substitutes for R410A, considered as the benchmark for GSHP applications. These fluids have been selected considering their lower flammability with respect to hydrocarbons (mainly R290), that is one of the main concerns for the companies. A parametric analysis has been performed, for a reversible GSHP cycle, at various heat source and sink conditions, with the aim to identify the fluid giving the best energetic performance and to evaluate the distribution of the irreversibilities along the cycle. Considering all these factors, R454B turned out to be the most suitable fluid to use in a ground source heat pump, working at given conditions. Special attention has been paid to the compression phase and the heat transfer in evaporator and condenser.

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“…The main purpose of these passive solutions is to make utilization of passive environmental solutions to saving energy possible (Güçyeter, Günaydın 2012;Wong, Li 2007;Chua et al 2013). Other than these, active solutions on the system side such as smart windows (Sabry et al 2014), heat pumps (Bianco et al 2017), and chilled beams (Nelson et al 2016). Occupancy demand driven controls, such as CO2 based demand control ventilation (Yang et al 2016a), occupancy state transitions based set point optimization (Yang, Becerik-Gerber 2017), occupancy diversity based HVAC system energy efficiency (Yang et al 2016b) have been investigated and implemented to save energy consumption in buildings.…”

Section: Introductionmentioning

confidence: 99%

Energy utilizability concept as a retrofitting solution selection criterion for buildings

Yang

Chong

Santamouris

et al. 2017

Journal of Civil Engineering and Management

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Retrofitting is widely explored as one of the energy conserving opportunities for existing buildings, in which both passive and active solutions are carefully evaluated. However, when different retrofitting solutions are combined and applied to a building, the total energy savings potential, which is less than the sum of the savings from applying the various individual retrofitting solutions, is considerably reduced and the synergies among the various technologies need to be understood and evaluated. In this study, the concept of utilizability is employed for the analysis of multiple energy retrofitting solutions in buildings and is defined as the ratio of energy savings derived from applying combined solutions to a building over the sum of individual energy savings from applying individual solutions. It is aimed at providing a better understanding of the combined retrofitting solutions. The sensitivity analysis on the utilizability value further provides a selection criterion for retrofitting solution selection.

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Estimation of primary energy savings by using heat pumps for heating purposes in the residential sector

Cited by 63 publications

References 23 publications

Prognostic potential of free convection models for analysis of thermal conditions of heat supply objects

Prognostic potential of free convection models for analysis of thermal conditions of heat supply objects

Energetic and Exergetic Analysis of Low Global Warming Potential Refrigerants as Substitutes for R410A in Ground Source Heat Pumps

Energy utilizability concept as a retrofitting solution selection criterion for buildings

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