Considering the Issue of Renovating Public Buildings With Reference to in-Kind Investigations Into Wall Heat Transfer Coefficients / Visuomeninių Pastatų Atnaujinimo Problemos Nagrinėjimas Remiantis Natūriniais Sienų Šilumos Perdavimo Koeficientų Tyrimais

Abstract

This article raises the problem of high energy consumption stimulated by heating buildings and preparing hot water. The paper shortly revises the state of renovating public buildings in Lithuania. A number of scientists devote close attention to examining various aspects of building renovation (technical regulations on constructions, subsidies provided by the state, cost-effectiveness, factors influencing building renovation, etc.). The article presents a few studies by foreign scientists, lists factors that determine public building renovation (unsatisfactory indoor air hygiene and floor temperature, indoor relative humidity, indoor air velocity, indoor carbon dioxide concentration, physical deterioration of a large building, poor aesthetic appearance of the building, etc.) and demonstrates a few practical examples. In accordance with Lithuanian design codes, a methodology for determining heat transfer coefficients in public buildings is provided. Besides, investigations into heat transfer coefficients before and after the renovation of public buildings have been conducted. A few nursery school buildings in Lithuania have been examined applying laboratory equipment before and after renovation. It was found that the wall heat transfer coefficient of properly designed and insulated buildings falls by more than 4–5 times to reach the normal value of the heat transfer coefficient (value of the heat transfer coefficient falls from 1.12 to 0.22 W/(m2·K)). A comparison of an external thermal insulation plastering composite system with an external aeration heat-insulated system has been done. The estimation has revealed that due to lower costs, better results of thermal resistance obtained using the external thermal insulation plastering composite system can produce better wall heat transfer coefficient values. The obtained results have been determined referring to better wall insulation tightness. The paper also summarizes data on heating buildings and consumption of prepared hot water before and after renovation. On the basis of the findings acquired employing the degree-day–method, public building energy consumption for heating and hot water preparation decreased from 41.30 to 43.73%. Santrauka Straipsnyje trumpai apžvelgta pastatų energinio efektyvumo problematika, visuomeninių pastatų atnaujinimo situacija Lietuvoje, pateikiami keli užsienio valstybių mokslininkų darbų, kuriuose nagrinėjama pastatų atnaujinimo tematika, pavyzdžiai. Be praktinių pavyzdžių, nurodomi veiksniai, lemiantys visuomeninės paskirties pastatų atnaujinimą. Taip pat pateikiami visuomeninės paskirties pastatų sienų šilumos perdavimo koeficientų tyrimų, atliktų naudojant laboratorinę įrangą, rezultatai, ištyrus kelis visuomeninės paskirties pastatus Lietuvoje prieš ir po pastatų atnaujinimo. Palyginta išorinė tinkuojama sudėtinė termoizoliacinė sistema su išorine vėdinamąja termoizoliacine sistema, apibendrinta nagrinėjamų pastatų sąnaudų šildyti ir karštam vandeniui ruošti ekonominė nauda prieš ir po pastatų atnaujinimo taikant dienolaipsnių metodiką.

Upgrading the Old Vernacular Building to Contemporary Norms: Multiple Criteria Approach

“…Sustainable building development is topical today and is taken into consideration by various researchers. They analyse problems related with energy efficiency and building's envelope (Ourghi et al 2007;Parasonis et al 2012;Yüksek, Esin 2013;Kazanasmaz et al 2014); building materials (Binici et al 2014;Pajchrowski et al 2014); analyse importance of buildings' modernisation (Staniūnas et al 2013;Volvačiovas et al 2013a); create strategies related with building upgrading (Volvačiovas et al 2013b;Itani et al 2013).…”

Multi-criteria Assessment Model of Technologies

“…Different characteristics of buildings were determined [3]: physical deterioration of buildings, absorption of facades, outdoor air temperature, indoor air temperature, relative humidity, floor temperature, surface (ceiling) temperature, carbon dioxide concentration, U-value. Thermovision was performed and economic calculations were made.…”

“…Potentially, the market for new high efficient technologies in the insulation sector is unlimited. Even when taking into account the diversity of insulation needs across Europe (depending, for instance, on climate specificities), all individual homes, buildings and industries could be the target of these technologies [3]. However, innovative technologies represent a small share of the total turnover of the insulation market in the European Union (around 5%).…”