scholarly journals ALTERNATYVIŲ VĖDINIMO SISTEMŲ IR MIKROKLIMATO TYRIMAI GYVENAMAJAME NAME / INVESTIGATION OF ALTERNATIVE VENTILATION SYSTEMS AND INDOOR CLIMATE IN LIVING HOUSE

2018 ◽  
Vol 10 (0) ◽  
pp. 1-6
Author(s):  
Rokas Petrašiūnas ◽  
Artur Rogoža ◽  
Violeta Misevičiūtė
Keyword(s):  
Energy Efficiency ◽  
Life Cycle Analysis ◽  
Ventilation System ◽  
Sick Building Syndrome ◽  
Primary Energy ◽  
Indoor Climate ◽  
Operation Costs ◽  
Sick Building ◽  
Residential House ◽  
Ventilation Systems

The purpose of the study was to determine which ventilation system centralized or decentralized in viewpoint of economic, energy and comfort is more advantageous in an individual residential house. The relevance of the work is related to the increasing energy efficiency requirements for newly built buildings and the resulting problems of the sick building syndrome due to insufficient ventilation of the rooms. The installation and operation costs of systems were identified. The Life Cycle Analysis (LCA) method was applied to estimate the amount of pollutants and primary energy consumed throughout the lifetime of ventilation systems. Measurements of indoor climate parameters were made; the results compared with the hygiene norms valid in Lithuania. The results of the analysis showed that the decentralized ventilation system is the most advantageous for economic and environmental impacts, but centralized ventilation system ensuring a better indoor climate. Santrauka Tyrimo tikslas buvo nustatyti, kokia vėdinimo sistema – centralizuota ar decentralizuota – ekonominiu, energiniu bei komforto požiūriu yra pranašesnė individualiame gyvenamajame name. Darbo aktualumas susijęs su didėjančiais energinio efektyvumo reikalavimais naujai statomiems pastatams ir iš to kylančiomis ligoto pastato sindromo problemomis dėl nepakankamo patalpų vėdinimo. Darbe buvo nustatyti sistemų įrengimo bei eksploatavimo kaštai, pritaikytas gyvavimo ciklo analizės (GCA) metodas, kuriuo įvertinti susidarančių teršalų bei suvartotos pirminės energijos kiekiai per visą vėdinimo sistemų gyvavimo laiką, atlikti patalpų mikroklimato rodiklių matavimai, o gauti rezultatai palyginti su Lietuvoje galiojančiomis higienos normomis. Išanalizavus rezultatus nustatyta, kad ekonominiu ir poveikio aplinkai požiūriais pranašesnė yra decentralizuota vėdinimo sistema, tačiau geresnį patalpų mikroklimatą užtikrina centralizuota vėdinimo sistema.

scholarly journals Heat Recovery Ventilation Systems and their Physical Quantification

2021 ◽  
Vol 1203 (2) ◽  
pp. 022045
Author(s):  
Boris Bielek ◽  
Daniel Szabó ◽  
Josip Klem ◽  
Roman Grolmus
Keyword(s):  
Energy Efficiency ◽  
Heat Recovery ◽  
Ventilation System ◽  
Co2 Concentration ◽  
High Energy ◽  
Operating Conditions ◽  
Indoor Climate ◽  
Measurement Results ◽  
Ventilation Systems

Abstract The essence of ventilation is the exchange of air in the room for fresh outside air. At the same time ventilation is a factor that can significantly affect the energy efficiency of a building. Hygienic requirements for ventilation of interiors of buildings in the context of increasing the energy efficiency of buildings lead to the transformation of unregulated ventilation by infiltration to regulated ventilation systems with heat recovery. The regulated ventilation system makes it possible to optimize the ventilation intensity on the basis of a stimulus from the room user or automatically on the basis of sensors monitoring the quality of the indoor climate (temperature and relative humidity, CO2 concentration in the air, etc.). In addition, if we use a ventilation system with heat recovery from the exhaust air to preheat the fresh supply air to the room, we can achieve high energy efficiency of the building by meeting the hygienic criteria of the indoor climate. The article describes heat recovery ventilation systems and their basic conceptual solutions applied in the modern architecture. The heat exchange between the hot exhaust air and the cold supply air in the winter takes place in heat recovery ventilation units in the heat exchanger. The efficiency of heat recovery defines how much heat we can transfer from the exhaust air to the fresh air in the heat recovery exchanger. The article analyses individual factors influencing the efficiency of heat recovery. Due to the fact that the manufacturers of heat recovery ventilation units declare in their brochures or websites the values of the maximum efficiencies of their products, we were interested in their real efficiencies under normal operating conditions. Therefore, we subjected to experimental research in a large climate chamber a product from the German manufacturer Lunos, namely a specific type of decentralized heat recovery unit Lunos Nexxt E. The article describes the methodology of laboratory experiment, used experimental basis, brings and analyses measurement results and calculates real efficiency of the subject heat recovery in accordance with STN EN 13 141. In the end it compares measured values with the values from the manufacturer.

scholarly journals Implementation of an algorithm for determining the effectiveness of ventilation and energy efficiency in industrial ventilation systems

2019 ◽  
Vol 111 ◽  
pp. 06038
Author(s):  
Marius Adam ◽  
Olga Bancea ◽  
Ioan Aschilean
Keyword(s):  
Energy Efficiency ◽  
Air Quality ◽  
Ventilation System ◽  
Source Control ◽  
Indoor Climate ◽  
Night Time ◽  
Industrial Ventilation ◽  
Ventilation Efficiency ◽  
Ventilation Rates ◽  
Ventilation Systems

The requirements for good indoor air quality and energy efficiency have often been considered to conflict with each other, however, buildings with low energy consumption in Europe seem to have also a lower rate of building related health symptoms. The paper aims to develop a succession of necessary operations, an algorithm, for the determination of ventilation efficiency and energy efficiency in industrial ventilation systems, starting from a general model that will be developed according to the particularities of the industrial ventilation system. These systems are important as they are related both to energy cost and indoor climate management as well as to the health of the occupants. The stages of algorithm development will include: source control and efficient removal of contaminants, proper location of fresh air intakes, cleaning of intake air, efficient air distribution in rooms with improved ventilation efficiency, heat recovery from exhaust air, night time ventilation cooling, ventilation rates control by air quality, correct balancing of air flows and controlling the indoor climate locally.

scholarly journals P.1.30 Assessment of sick building syndrome among employees in the commercial centers in Niš, serbia

2019 ◽  
Vol 76 (Suppl 1) ◽  
pp. A85.2-A85
Author(s):  
Bojana Miladinovic ◽  
Maja Nikolic ◽  
Aleksandra Stankovic ◽  
Sci Visa Tasic
Keyword(s):  
Logistic Regression ◽  
Room Temperature ◽  
Ventilation System ◽  
Sick Building Syndrome ◽  
Binary Logistic Regression ◽  
Static Electricity ◽  
Cross Sectional ◽  
Quality Of Working Life ◽  
Dry Air ◽  
Sick Building

Sick Building Syndrome (SBS) is a diseases associated with indoor air quality accompanied with various nonspecific symptoms that occur in the occupants of a building. This syndrome has been the subject of serious scientific investigation in the past years, but there are not enough studies in transition countries.The aim of this study was to investigate the symptoms of the syndrome among employees in the commercial centers in Niš, Serbia.MethodsThe cross-sectional study was conducted amongst employees of two commercial centers in the city of Niš, Serbia. In this study the MM-040EA questionnaire was used with two additional questions and 1152 employed were interviewed during the period of three years. Data extracted from the questionnaires were analyzed using the chi-square test and binary logistic regression.ResultsThe prevalence of SBS was high. The most common symptoms reported by employees included high room temperature (74.9%), stuffy air (73.5%), and dry air (75.7%), while rare complaints were towards static electricity (47.3%) and low room temperature (45.2%). Binary logistic regression showed that too low room temperature (p=0.002), dry air (p=0.015), static electricity (p=0.007) and noise (p=0. 024) were the most important factors for the high symptoms score. A relatively small number of sick absence (13.4%) was found among subjects working in the investigated commercial centers.ConclusionThe high prevalence of SBS symptoms in the environment of commercial centers was almost associated with factors of unpleasant microclimate. So improvement of environmental conditions such as increasing the efficiency of the ventilation system, increasing fresh air flow in the sector and noise prevention , as well as enhancing the quality of working life will motivate the employees and increase productivity in the workplace. The occupational health care workers play an important role in educating of workers and their employers.

scholarly journals Exergy-based Control of a Dwelling Ventilation System with Heat Recovery

2019 ◽  
pp. 114-116
Author(s):  
Volodymyr Voloshchuk ◽  
Mariya Polishchuk
Keyword(s):  
Power Consumption ◽  
Heat Recovery ◽  
Operation Mode ◽  
Ventilation System ◽  
Primary Energy ◽  
Energy Sources ◽  
Annual Saving ◽  
Operating Modes ◽  
Ventilation Systems

On the base of exergy-based approach it is shownthat for the ventilation systems there are operating modes forwhich heat recovery increases exergy of fuel expended to providethe ventilation air compared to cases without bringing anyrecovery of heat and additional power consumption to drive theair flow by the fans. For the specified system, in case of switchingventilation unit to the operation mode of lower values of spentfuel exergy it is possible to provide annual saving from 5 to 15 %of the primary energy sources.

scholarly journals Smart energy management of combined ventilation systems in a nZEB

2019 ◽  
Vol 111 ◽  
pp. 01050 ◽  
Author(s):  
Javier M. Rey-Hernández ◽  
Sergio Lorenzo González ◽  
Julio F. San José-Alonso ◽  
Ana Tejero-González ◽  
Eloy Velasco-Gómez ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Management ◽  
Ventilation System ◽  
High Energy ◽  
Dynamic Monitoring ◽  
Control Technique ◽  
Automation Systems ◽  
The Impact ◽  
Ventilation Systems

The high energy consumption, attached to a high energy demand in buildings, has led the development of several research projects with the target of reducing the energy consumption in the buildings. As a result of this high consumption, the increased CO2 emissions that have been generated in recent years, have reached alarming levels, which is why it is necessary to reduce the environmental impact which we are contributing to our planet through the use of energy. The European Directive on Building Performance (EPBD 2018/844/EU), recently updated, requires new buildings to be close to the Zero Energy Buildings (nZEBs), increasing the use of renewable energies on-site, and also highlight how to get to improve the cost-effective renovation of existing buildings with the introduction of building control and automation systems ( smart systems), as well as the energy savings and increase the efficiency of energy systems, by reducing CO2 emissions. The use of new renewable energy technologies integrated in buildings, with the aim of reducing the consumption of the facilities that all nZEB buildings must have, such as the ventilation system used as an Indoor Air Quality (IAQ) control technique. In this study, the energy management of the enthalpy ventilation control system is analysed, where dynamic monitoring is going on in the building controlled through Supervisory Control And Data Acquisition (SCADA), in combination with different ventilation systems as free-cooling, heat recovery and geothermal energy of an Earth Air Heat eXchanger (EAHX), all of them as strategies implemented in a real nZEB building (LUCIA) located on the campus at the University of Valladolid, with the goal of improving energy efficiency in ventilation. In order to get this aims, monitoring data of several energy parameters (temperature, air velocity, air flow rate, enthalpy, etc.) are measurements, they allow us to perform a control of the combined ventilation systems to achieve a high IAQ and analyze an optimization of the energy efficiency of the all systems and to study of energy recovery and savings of carbon emissions that directly affect the reduction of the impact of climate change. The results achieved are the energy efficiency of the building in ventilation and optimum system operation in cooling and heating mode. In addition, by controlling the ventilation, the IAQ of the nZEB building is improved.

Sign in / Sign up

Export Citation Format

Share Document