Thermodynamic sustainability assessment for residential building heating comparing different energy sources

Gojak, Milan; Bajc, Tamara

doi:10.1080/23744731.2021.1908043

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…EU member states have provided long-term renovation strategies to facilitate this [1,2]. A transition from fossil fuels to renewable energy is an important issue to be addressed [3]. One potential measure to contribute to EPBD targets is the replacement of fossil fuel-based oil heating in buildings [4,5].…”

Section: Introductionmentioning

confidence: 99%

Renovation Results of Finnish Single-Family Renovation Subsidies: Oil Boiler Replacement with Heat Pumps

et al. 2022

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Finland has approximately 150,000 oil-heated private homes. In 2020, the Finnish government launched subsidies for private homeowner energy renovations. In this study, we examine the impact of two new energy renovation subsidies, the ELY grant and the ARA grant, from an energy efficiency point of view. Data from these subsidies reveal that a typical energy renovation case is a building from the 1970s where the oil boiler is replaced with an air-to-water heat pump. With additional data from the Finnish Energy certificate registry, a reference 1970s house is constructed and modelled in the building simulation programme, IDA ICE 4.8. Combinations of several renovation measures are simulated: air-to-water heat pump, ground-source heat pump, ventilation heat recovery and improved insulation. We found that resorting mainly to air-to-water heat pumps is not the most energy-effective solution. Ground-source heat pumps deliver a more significant reduction in delivered energy, especially with additional measures on insulation and heat recovery. Ground-source heat pumps also demand slightly less power than air-to-water heat pumps. Onsite solar PV generation helps supplement part of the power needed for heat pump solutions. Subsidy policies should emphasize deep renovation, ventilation heat recovery and onsite electricity generation.

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Section: Introductionmentioning

confidence: 99%

Renovation Results of Finnish Single-Family Renovation Subsidies: Oil Boiler Replacement with Heat Pumps

et al. 2022

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“…Since we have not a direct source on the thermal energy needs of the residential building stock in Rome, the study was based on data relating to the primary energy needs of the residential building stock in Rome divided by construction period [24]. In particular, starting from the study in [8] on the morphological characteristics and thermal transmittance of each portion of the building envelope, based on the construction period, we show in table 1, for the different periods, the specific energy requirement index of primary energy for winter heating (EPi) and that of global primary energy for winter heating and DHW production (EPgl). It should be noted that the overall heating energy requirement in 2009, just over 9600 GWh / year, almost 80% is attributable to buildings built before 1976, with an evident disproportion between the number of these buildings and the related needs; in particular, compared to the current standard of less than 40 kWh / m 2 year, values close to 130 kWh / m 2 year are recorded for less efficient buildings.…”

Section: Energy Characterization Of the Residential Building Stock In...mentioning

confidence: 99%

The heat pumps for better urban air quality✰

Carella

D’Orazio

2021

Sustainable Cities and Society

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“…The study by Gojak et al [4] presents a thermodynamic sustainability assessment of various energy sources for residential buildings heating in Serbia. The authors concluded that the use of HPs, cogeneration or waste heat from thermal processes for heating implies advantages with respect to use of fossil fuels directly or for electricity production.…”

Section: Introductionmentioning

confidence: 99%

Air/Water Heat Pumps in Existing Heating and Hot Water Systems for Better Urban Air Quality and Primary Energy Savings: Scenarios of Two Italian Cities

Carella

Ferraro²,

D’Orazio

2022

Energies

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In a previous work, a significant contribution to urban air pollution, related to fuel-fired heating systems, was recorded. Thus, the replacement of existing boilers for space heating and domestic hot water (DHW) production systems with high-temperature air/water heat pumps (which can operate with radiators, the most common terminals in the existing building stock), is proposed for the improvement of the urban air quality. Scenarios of substitution within the entire residential building stock of two Italian cities, Milan and Salerno, belonging to different climate zones and with their own thermophysical characteristics, were analyzed. For each of them, the consequences of the replacement intervention on emission reduction, primary energy savings and lower CO2 production were evaluated. The results show that reduction of primary energy consumption, evaluated at design outdoor temperature and for the present generation mix, varied between 34% and 54% in Milan and between 43% and 60% in Salerno, for two values of renewable fraction in electricity generation. The reduction of CO2 production was in the range 30–52% in Milan and 39–58% in Salerno, respectively. The only unfavorable case occurred for Milan for a completely non-renewable electricity generation scenario. The replacement intervention, which implies a significant decrease of emissions of pollutants in urban areas, is unobtrusive to citizens, since the heat pumps (HPs) are coupled with current radiators, without the internal distribution system being modified.

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Thermodynamic sustainability assessment for residential building heating comparing different energy sources

Cited by 4 publications

References 33 publications

Renovation Results of Finnish Single-Family Renovation Subsidies: Oil Boiler Replacement with Heat Pumps

Renovation Results of Finnish Single-Family Renovation Subsidies: Oil Boiler Replacement with Heat Pumps

The heat pumps for better urban air quality✰

Air/Water Heat Pumps in Existing Heating and Hot Water Systems for Better Urban Air Quality and Primary Energy Savings: Scenarios of Two Italian Cities

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