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Comparison of air pressure difference, air change rates, and CO2 concentrations in apartment buildings before and after energy retrofits

机译：能源改造前后公寓楼中的气压差，换气率和CO2浓度的比较

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Impacts of energy retrofits on air pressure differences across building envelope, air change rate (ACR), and indoor carbon dioxide (CO2) concentrations were studied. Measurements were performed before and after the retrofits of multi-family buildings during heating season in two Northern European countries: Finland and Lithuania. In the Finnish case buildings (Napartments = 128), pressure differences against outdoor were within national guideline values before the retrofits in 52% and after the retrofits in 42% of the buildings with mechanical exhaust ventilation system. The values were within the guidelines before the retrofits in 33% and after the retrofits in 20% in buildings with natural ventilation, correspondingly. In the Lithuanian case buildings (N-apartments = 31), pressure differences against outdoor were within the same guideline values before the retrofits in 77% and after the retrofits in 52% of the buildings. After the retrofits, higher air pressure differences and ACR, as well as lower CO2 concentrations, were observed in Finnish buildings with mechanical ventilation. On the contrary, lower air pressure differences and ACR, as well as higher CO2 concentrations, were observed in Lithuanian buildings with natural ventilation. (C) 2017 Elsevier Ltd. All rights reserved.
机译：研究了能源改造对建筑物围护结构上的气压差，空气变化率（ACR）和室内二氧化碳（CO2）浓度的影响。在两个北欧国家（芬兰和立陶宛），在供暖季节的多户建筑翻新之前和之后进行测量。在芬兰案例的建筑物（公寓= 128）中，在进行机械改造之前，对室外的压力差在52％的改造之前和42％的机械排气通风系统的改造后的国家指导值内。在自然通风的建筑物中，该值分别在改造前的33％和改造后的20％的准则之内。在立陶宛案例建筑物（N单元= 31）中，在室外进行改造之前，对77％的建筑物和在对52％进行改造之后，室外的压力差均在相同的指导值之内。改造后，在带有机械通风的芬兰建筑物中观察到较高的气压差和ACR以及较低的CO2浓度。相反，在自然通风的立陶宛建筑中，观察到较低的气压差和ACR以及较高的CO2浓度。 （C）2017 Elsevier Ltd.保留所有权利。

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