Major Renovation

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The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform

A P Softech - One of the best experts on this subject based on the ideXlab platform.

Targo Kalamees - One of the best experts on this subject based on the ideXlab platform.

  • case study analysis of concrete large panel apartment building at pre and post low budget energy Renovation
    Journal of Civil Engineering and Management, 2016
    Co-Authors: Kalle Kuusk, Targo Kalamees, Siim Link, Simo Ilomets, Alo Mikola
    Abstract:

    AbstractThe paper presents a case study analysis of low-budget Renovation of a typical concrete large-panel apartment building. Focus is on the measurements and analyses of energy consumption, indoor climate, CO2 concentration, air leakage rate, thermal transmittance of thermal bridges, and thermal transmittance of the building envelope before and after the Renovation. Results indicate that the Renovation project was generally successful, with delivered energy need decreasing by 40% and heating energy need decreasing by 50%. However, some key problems need to be solved to achieve full energy efficiency potential of the Renovation works. Those critical problems are the performance (thermal comfort, heat recovery) of ventilation systems, thermal bridges of external wall/window jamb and economic viability. Currently, a Major Renovation is not economically viable, therefore financial assistance to the apartment owners’ associations is required to encourage them to undertake Major Renovations.

  • nZEB Retrofit of a Concrete Large Panel Apartment Building
    Energy Procedia, 2015
    Co-Authors: Kalle Kuusk, Targo Kalamees
    Abstract:

    Abstract The paper discusses energy Renovation scenarios from Major Renovation to nZEB level for apartment buildings in Estonia (cold climate). The study analyses energy usage and economic viability taking into account a possible increase in the lease income after Renovation under apartment building Renovation scenarios. Our results show that deep Renovation of old apartment buildings enables the energy performance requirements of nearly zero energy apartment buildings to be achieved. With nZEB Renovation, reductions are ca 70% in delivered energy (heating energy + electricity) need and ca 60% in primary energy need. Payback period of nZEB Renovation without increased lease income is around 30 years. In the best scenario case, the payback period of nZEB Renovation is around eight years when the increase of the annual lease income is taken into account.

  • analysis of energy economic Renovation for historic wooden apartment buildings in cold climates
    Applied Energy, 2014
    Co-Authors: Endrik Arumagi, Targo Kalamees
    Abstract:

    Buildings represent the largest sector of primary energy consumption and play a Major role in saving energy and reducing greenhouse gas emissions. Our analysis of energy consumption and potential energy savings is based on field measurements, computer simulations and economic calculations. The average primary energy consumption (PE) of wooden apartment buildings was 331 kW h/(m2 a) 83% higher than the limit 180 kW h/(m2 a) set in national regulations for apartment buildings subject to Major Renovation. The studied buildings represent a high potential for energy savings. The Renovation packages were compiled using different insulation measures, HVAC solutions and energy sources to achieve a 20–65% reduction of primary energy. For historic buildings, the Renovation solutions that concentrate on the building envelope can be problematic due to the need to preserve cultural and architectural values. Our calculation results indicate that the cost optimal PE level is around 250 kW h/(m2 a) and the point at which Renovation packages recover expenses is around a PE level of 170 kW h/(m2 a). In terms of the architectural appearance the point at which Renovation packages recover expenses is around a PE level of 210 kW h/(m2 a). We propose to set a different PE limit for historic wooden apartment buildings with an architectural appearance worth preserving.

Bahram Moshfegh - One of the best experts on this subject based on the ideXlab platform.

  • Energy use and perceived indoor environment in a Swedish multifamily building before and after Major Renovation
    Sustainability (Switzerland), 2018
    Co-Authors: Lina La Fleur, Patrik Rohdin, Bahram Moshfegh
    Abstract:

    Improved energy efficiency in the building sector is a central goal in the European Union and Renovation of buildings can significantly improve both energy efficiency and indoor environment. This paper studies the perception of indoor environment, modelled indoor climate and heat demand in a building before and after Major Renovation. The building was constructed in 1961 and renovated in 2014. Insulation of the façade and attic and new windows reduced average U-value from 0.54 to 0.29 W/m2·K. A supply and exhaust ventilation system with heat recovery replaced the old exhaust ventilation. Heat demand was reduced by 44% and maximum supplied heating power was reduced by 38.5%. An on-site questionnaire indicates that perceived thermal comfort improved after the Renovation, and the predicted percentage dissatisfied is reduced from 23% to 14% during the heating season. Overall experience with indoor environment is improved. A sensitivity analysis indicates that there is a compromise between thermal comfort and energy use in relation to window solar heat gain, internal heat generation and indoor temperature set point. Higher heat gains, although reducing energy use, can cause problems with high indoor temperatures, and higher indoor temperature might increase thermal comfort during heating season but significantly increases energy use.

Lina La Fleur - One of the best experts on this subject based on the ideXlab platform.

  • Energy use and perceived indoor environment in a Swedish multifamily building before and after Major Renovation
    Sustainability (Switzerland), 2018
    Co-Authors: Lina La Fleur, Patrik Rohdin, Bahram Moshfegh
    Abstract:

    Improved energy efficiency in the building sector is a central goal in the European Union and Renovation of buildings can significantly improve both energy efficiency and indoor environment. This paper studies the perception of indoor environment, modelled indoor climate and heat demand in a building before and after Major Renovation. The building was constructed in 1961 and renovated in 2014. Insulation of the façade and attic and new windows reduced average U-value from 0.54 to 0.29 W/m2·K. A supply and exhaust ventilation system with heat recovery replaced the old exhaust ventilation. Heat demand was reduced by 44% and maximum supplied heating power was reduced by 38.5%. An on-site questionnaire indicates that perceived thermal comfort improved after the Renovation, and the predicted percentage dissatisfied is reduced from 23% to 14% during the heating season. Overall experience with indoor environment is improved. A sensitivity analysis indicates that there is a compromise between thermal comfort and energy use in relation to window solar heat gain, internal heat generation and indoor temperature set point. Higher heat gains, although reducing energy use, can cause problems with high indoor temperatures, and higher indoor temperature might increase thermal comfort during heating season but significantly increases energy use.

Kalle Kuusk - One of the best experts on this subject based on the ideXlab platform.

  • case study analysis of concrete large panel apartment building at pre and post low budget energy Renovation
    Journal of Civil Engineering and Management, 2016
    Co-Authors: Kalle Kuusk, Targo Kalamees, Siim Link, Simo Ilomets, Alo Mikola
    Abstract:

    AbstractThe paper presents a case study analysis of low-budget Renovation of a typical concrete large-panel apartment building. Focus is on the measurements and analyses of energy consumption, indoor climate, CO2 concentration, air leakage rate, thermal transmittance of thermal bridges, and thermal transmittance of the building envelope before and after the Renovation. Results indicate that the Renovation project was generally successful, with delivered energy need decreasing by 40% and heating energy need decreasing by 50%. However, some key problems need to be solved to achieve full energy efficiency potential of the Renovation works. Those critical problems are the performance (thermal comfort, heat recovery) of ventilation systems, thermal bridges of external wall/window jamb and economic viability. Currently, a Major Renovation is not economically viable, therefore financial assistance to the apartment owners’ associations is required to encourage them to undertake Major Renovations.

  • nZEB Retrofit of a Concrete Large Panel Apartment Building
    Energy Procedia, 2015
    Co-Authors: Kalle Kuusk, Targo Kalamees
    Abstract:

    Abstract The paper discusses energy Renovation scenarios from Major Renovation to nZEB level for apartment buildings in Estonia (cold climate). The study analyses energy usage and economic viability taking into account a possible increase in the lease income after Renovation under apartment building Renovation scenarios. Our results show that deep Renovation of old apartment buildings enables the energy performance requirements of nearly zero energy apartment buildings to be achieved. With nZEB Renovation, reductions are ca 70% in delivered energy (heating energy + electricity) need and ca 60% in primary energy need. Payback period of nZEB Renovation without increased lease income is around 30 years. In the best scenario case, the payback period of nZEB Renovation is around eight years when the increase of the annual lease income is taken into account.

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