On-Site Diagnostics Of The Mechanical Ventilation In Office Buildings

Błaszczok, Monika; Król, Małgorzata; Hurnik, Maria

doi:10.21307/acee-2017-028

Cited by 9 publications

(11 citation statements)

References 9 publications

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“…The last step should be diagnostic measurements that will allow an evaluation of the operation of the system in real conditions [40]. This scenario is relatively easy to implement for mechanical ventilation and an example of such diagnostics can be found in Blaszczok et al [41]. For natural ventilation, it is quite challenging to objectively assess the quality of ventilation.…”

Section: Diagnostics Of Natural Ventilation Systemsmentioning

confidence: 99%

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

Ferdyn-Grygierek¹,

Baranowski²,

Błaszczok³

et al. 2019

Energies

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Diagnostics of natural ventilation in buildings is problematic, as the airflow rate changes considerably over time. One constant average airflow is usually assumed when calculating energy demand for a building, however, such a simplification could be fraught with considerable error. The paper describes a comprehensive methodology for the diagnostics of a natural ventilation system in a building and its practical application. Based on in situ measurements and simulations in two existing buildings (dwelling house and school) in Poland, the real values of the ventilating airflows were analyzed and resulting heat demand was compared with the design values. The pros and cons of various methods for evaluation of natural ventilation are discussed. The real airflow was determined by measurements in a ventilation grille or by a tracer gas concentration decay method. The airtightness of the buildings’ envelope was evaluated based on the fan pressurization test. The last stage entailed computer simulations of air exchange in buildings using CONTAM software. The multizone models of the buildings were calibrated and verified with existing measured data. Measured airflow in a multifamily house was small and substantially deviated from the Polish standard. In case of a school, the air flow rate amounted to an average of 10% of the required value. Calculation of the heat demand for ventilation based on the standard value of the airflow led to a considerable overestimation of this value in relation to the real consumption. In the analyzed cases, the difference was 40% for the school and 30% for the residential building.

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Section: Diagnostics Of Natural Ventilation Systemsmentioning

confidence: 99%

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

Ferdyn-Grygierek¹,

Baranowski²,

Błaszczok³

et al. 2019

Energies

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“…During carried out diagnostics it was found that the airtight windows do not have diffusers, which results in the lack of air flow in the exhaust ventilation system [4]. A detailed description of selected elements of mechanical ventilation is presented in the paper [17]. In practice there is only the natural ventilation in the building.…”

Section: Description Of the Studied Office Buildingmentioning

confidence: 99%

Estimation Of The Seasonal Demand For Cooling Based On The Short-Term Data

Bartosz

Specjał

2017

Architecture, Civil Engineering, Environment

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In accordance with the requirements of the Directive on the energy performance of buildings [1], the energy performance of a building based on measurements may be an alternative for a computational one. In practice, it is important that the method should be relatively simple, based on short-term measurements in the real object. The annual heat consumption for heating and ventilation in reference climatic conditions is the basic component of the energy performance of buildings. The annual energy consumption for cooling and ventilation in public utility and office buildings in reference climatic conditions is the additional component. A b s t r a c t The paper analyzes the possibility of using the energy signature method based on the linear regression to determine the seasonal energy demand for cooling and ventilation in the office building. The "extended" energy signature method (H-m method) was described and applied. In accordance with Standard (EN 15603) the estimation of energy consumption for cooling can be performed for a period shorter than the entire season, but data range must be appropriate to obtain the correct accuracy of the results. The presented analysis concerns the uncertainty of estimation the seasonal demand for cooling and ventilation of the building based on monthly and 14-day data. The objective was to choose the shortest possible time period in order to obtain proper accuracy. It has been shown that the H-m method cannot be used to estimate cooling demand based on short-term (monthly or 14-days) data due to unacceptable uncertainty of results.S t r e s z c z e n i e W artykule przeanalizowano możliwość zastosowania metody sygnatury energetycznej opartej na regresji liniowej do wyznaczania sezonowego zapotrzebowania na energię do chłodzenia i wentylacji w budynku biurowym. Przedstawiono i zastosowano skorygowaną metodę sygnatury energetycznej (metodę H-m). Zgodnie z normą (EN 15603) szacowanie zużycia chłodu może być wykonywane dla okresu krótszego niż cały sezon, ale zakres danych musi być odpowiedni dla uzyskania właściwej dokładności wyników. Przedstawiona analiza dotyczy niepewności szacowania sezonowego zapotrzebowania budynku na chłód na podstawie danych miesięcznych i 14-dniowych. Celem był wybór najkrótszego możliwego do zastosowania metody okresu czasu, w którym uzyskuje się odpowiednią dokładność. Wykazano, że metody H-m nie można zastosować do szacowania zapotrzebowania na chłód na podstawie danych z krótkich okresów (miesięcznych, czy 14-dniowych), ze względu na nieakceptowane niepewności uzyskanych wyników.K e y w o r d s : Cooling; Energy demand; Energy performance; Energy signature; Linear regression; Office building.

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“…As a result, there has been a need for on-site diagnostics of air conditioning installations, which should include energy efficiency assessments whether it meet the requirements of the building. [4,7,8] and in the current paper, • the on-site the diagnostics of indoor environment quality, the results are presented in [4,9], • the measurement based drawing up of energy performance certificates, the results are presented in [4,[10][11][12][13]. Full diagnostics is understood as a combination of inspection and diagnostic measurements.…”

Section: S T R E S Z C Z E N I Ementioning

confidence: 99%

“…The tested cooling sources are located in two office buildings. Brief description of the construction of the buildings and the performed thermal diagnostics of the ventilation systems in these buildings is presented in the paper [8].…”

Section: Description Of the Tested Cooling Sourcesmentioning

confidence: 99%

On-Site Thermal Diagnostics Of Cooling Sources For Air Conditioning Systems In Office Buildings

Hurnik

Błaszczok

Król

2017

Architecture, Civil Engineering, Environment

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on the energy performance of buildings introduced the obligation of regular inspection of air conditioning systems. With regard to reducing energy consumption and limiting carbon dioxide emissions, Member States shall lay down the necessary measures to establish a regular inspection of airconditioning systems of an effective rated output of more than 12 kW. Effective rated output is the maximum cooling capacity given by the manufacturer, which the unit delivers during continuous operation. The inspection shall include an assessment of the airconditioning efficiency and the sizing compared to the cooling requirements of the building.

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On-Site Diagnostics Of The Mechanical Ventilation In Office Buildings

Cited by 9 publications

References 9 publications

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

Estimation Of The Seasonal Demand For Cooling Based On The Short-Term Data

On-Site Thermal Diagnostics Of Cooling Sources For Air Conditioning Systems In Office Buildings

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