Economic performance assessment of three renovated multi-family buildings with different HVAC systems

Khadra, Alaa; Hugosson, Mårten; Akander, Jan; Zhang, Xingxing

doi:10.1016/j.enbuild.2020.110275

Cited by 17 publications

(13 citation statements)

References 18 publications

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“…Since there is uncertainty in estimating future rates, the values are varied to ascertain their impact on results. The values used in this study are the same as those motivated and used in [44] (that study was performed at the same time and in approximately same geographic location). In this study, the chosen nominal discount rate is 5% and investigates rates at 4% and 6%, too.…”

Section: Categorymentioning

confidence: 99%

Low-Emissivity Window Films as an Energy Retrofit Option for a Historical Stone Building in Cold Climate

et al. 2021

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Low-emissivity (low-E) window films are designed to improve the thermal comfort and energy performance of buildings. These films can be applied to different glazing systems without having to change the whole window. This makes it possible to apply films to windows in old and historical buildings for which preservation regulations often require that windows should remain unchanged. This research aims to investigate the impacts of low-E window films on the energy performance and thermal comfort of a three-story historical stone building in the cold climate of Sweden using the simulation software “IDA ICE”. On-site measurements were taken to acquire thermal and optical properties of the windows. This research shows that the application of the low-emissivity window film on the outward-facing surface of the inner pane of the double-glazed windows helped to reduce heat loss through the windows in winter and unwanted heat gains in summer by almost 36% and 35%, respectively. This resulted in a 6% reduction in the building’s annual energy consumption for heating purposes and a reduction in the percentage of total occupant hours with thermal dissatisfaction from 14% (without the film) to 11% (with the film). However, the relatively high price of the films and low price of district heating results in a rather long payback period of around 30 years. Thus, the films seem scarcely attractive from a purely economic viewpoint, but may be warranted for energy/environmental and thermal comfort reasons.

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Section: Categorymentioning

confidence: 99%

Low-Emissivity Window Films as an Energy Retrofit Option for a Historical Stone Building in Cold Climate

et al. 2021

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“…A further aspect of electricity demand is that to reduce the space heating demand of a building, it might be necessary to install a ventilation system with heat recovery. This increases total electricity demand and affects primary energy use [66,67]. For the district multi-family building stock, changing ventilation system has not been considered.…”

Section: Discussionmentioning

confidence: 99%

Investigating Energy Use in a City District in Nordic Climate Using Energy Signature

2022

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This paper focuses on multi-family buildings in a Swedish city district, erected between 1965 and 1973, which are now in need of renovation. For the two types of multi-family buildings in the district, tower buildings and low-rise buildings, dynamic energy use is predicted by using an energy signature method. The energy signature is then used to calculate the primary energy use number of the building stock, according to calculations methods dictated by Swedish building regulations. These regulations are also used to assess which multi-family buildings are in need of renovation, based on the buildings’ primary energy use. For buildings that need energy renovations, it is simulated so that the energy use of each multi-family building complies with these same building regulations. The proposed methodology for simulating energy renovation also determines new energy signature parameters, related to building heat loss coefficient, balance temperature and domestic hot water usage. The effects of simulated renovation are displayed in a duration diagram, revealing how a large-scale renovation affects the district’s heat load in different annual periods, which affects the local district heating system. Sensitivity analysis is also performed before and after simulated energy renovation.

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“…Net Present Value method has been generally used for the various cases of energy efficiency measures, and the final result possesses in a study was 54% reduction in energy consumption by a drop of LCC by 13.5% [10] [16]. Author Khadra has used single present value and uniform present values for calculation, and a sensitive analysis is performed with a 2% inflation rate, a 3% real discount rate, and a 1% energy tariff escalation [19]. A study of total LCCA for a girdconnected PV systems ultimately results a saving of 83.97 dollars/day [15].…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of various parameters on lifecycle cost of buildings with active energy efficiency measures.

prabu

Rakesh

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The energy consumption of the building sector has heightened significantly in recent times owing to rapid global urbanization. Energy efficiency measures (EEM) may become a legal obligation for construction in years ahead. This study proposes the execution of Active Energy Efficiency Measures (AEEM) in a hospital building model evolved in energy simulation software while designed for a warm and humid environment. A series of design models were developed for the study by considering temperature set-points, HVAC star rating, and roof area for solar plant as the varying parameters. Investors have been reluctant to adopt efficiency measures attributed to the rise in their capital costs. Therefore, the study performed a Lifecycle Cost Analysis (LCCA) and payback period computations for additional investments to implement EEM. The findings are presented in the form of a correlation study between percentages of annual energy savings, life-cycle cost reductions, and additional capital investments for the implementation of AEEM. Energy conservation strategies without any additional investments to obtain a good future return are also discussed. With the combination of varying parameters, energy savings of up to 38.66% and a reduction in Lifecycle Cost (LCC) of up to 17.25% are obtained. Comparisons of design models highlight the importance of performing energy simulations and LCCA prior to actually making an investment in energy efficiency strategies.

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Economic performance assessment of three renovated multi-family buildings with different HVAC systems

Cited by 17 publications

References 18 publications

Low-Emissivity Window Films as an Energy Retrofit Option for a Historical Stone Building in Cold Climate

Low-Emissivity Window Films as an Energy Retrofit Option for a Historical Stone Building in Cold Climate

Investigating Energy Use in a City District in Nordic Climate Using Energy Signature

Influence of various parameters on lifecycle cost of buildings with active energy efficiency measures.

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