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    Wyświetlanie 1-9 z 9
    Tytuł:
    Synergetic control for HVAC system control and VAV box fault compensation
    Autorzy:
    Ettouil, Radhia
    Chabir, Karim
    Sauter, Dominique
    Abdelkrim, Mohamed Naceur
    Powiązania:
    https://bibliotekanauki.pl/articles/330250.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    HVAC system
    synergetic control
    reconfigurable control
    system HVAC
    sterowanie synergiczne
    sterowanie rekonfigurowalne
    Opis:
    Synergetic control is proposed for heating, ventilating and air-conditioning (HVAC) system control. The synergetic controller is developed using the nonlinear model of the HVAC system. Occupancy information in each zone is required in the design of the controller which offers inherent comfort according to the occupancy in the zone. The stability of the building system using the proposed control is verified through the Lyapunov approach. It is also proved that the synergetic controller is robust to external disturbances. Then, synergetic theories are used to design a reconfigurable control for damper stuck failures in variable air volume (VAV) to recover the nominal performance. Simulations are provided to validate the effectiveness of the proposed controller for a three-zone building.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 3; 555-570
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Validation of the HVAC Humming-type Noise and Vibration in Model and Vehicle System Levels
    Autorzy:
    Satar, Mohd Hafiz Abdul
    Mazlan, Ahmad Zhafran Ahmad
    Hamdan, Muhd Hidayat
    Isa, Mohd Syazwan Md
    Paiman, Muhd Abdul Rahman
    Ghapar, Mohd Zukhairi Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/1953462.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    humming noise
    HVAC system
    vibration
    compressor
    AC pipe
    Opis:
    The presence of noises in the vehicle cabin is an annoyance phenomenon which is significantly affected by the heating, ventilation, and air conditioning (HVAC) system. There are very limited studies reported on the specific type of noise characterisation and validation for both model and vehicle system levels. The present study developed a model of HVAC system that reflects the operation as in real vehicle, and the investigation of the HVAC components were carried out individually to determine which component contributes to the humming-type noise and vibration. The study was conducted under two conditions; idle speed of engine (850 rpm) and operating condition (850-1400 rpm). A ixed blower speed and full-face setting were applied throughout the experimental process. Three different sensors were used for the experiment, which are: accelerometer, tachometer, and microphone. From the results, the compressor and AC pipe components have contributed the most in generating the noise and vibration for both the model and vehicle systems. The findings also highlight that the humming-type noise and vibration were produced in the same operating frequency of 300-400 Hz and 100-300 Hz for idle and operating conditions, respectively, and this result was validated for both model and vehicle system levels.
    Źródło:
    Archives of Acoustics; 2021, 46, 2; 375-385
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Lab-scale HVAC Hissing-type Noise and Vibration Characterization with Vehicle System Validation
    Autorzy:
    Satar, Mohd Hafiz Abdul
    Mazlan, Ahmad Zhafran Ahmad
    Hamdan, Muhd Hidayat
    Isa, Mohd Syazwan Md
    Paiman, Muhd Abdul Rahman
    Ghapar, Mohd Zukhairi Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/1953472.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    hissing noise
    HVAC system
    vibration
    evaporator
    thermal expansion valve
    Opis:
    Heating, ventilation and air conditional (HVAC) system provides a cold ventilation for the comfort of the driver and passengers in a vehicle. However, the vibration induced by the HVAC contributes to a reasonable level of noise emission, and hissing is one of the critical noises. So far, the characterization of hissing noise from the vehicle is least to be reported compared to other type of noises. Hence, this paper investigates the occurrence of hissing noise from several HVAC components. A lab-scale HVAC system was developed to imitate the real-time operations of the vehicle HVAC system. Two engine conditions, namely as ambient and operating conditions, were tested at speed of 850 rpm and 850-1400 rpm, with the blower speed maintained constantly at one level. The result shows that the hissing noise from the labscale HVAC was produced at frequency range of 4000-6000 Hz. The finding also highlights that the main component contributors of noise emission are an evaporator and a thermal expansion valve. The validation with a real vehicle system showed a good consensus whereby the hissing noise was produced at the similar operating frequency ranges. Also, the hissing noise was found to be louder when in an operating condition which could be taken into consideration by the vehicle manufacturers to improve the HVAC design.
    Źródło:
    Archives of Acoustics; 2021, 46, 2; 365-373
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of adaptive multivariable Generalized Predictive Control to a HVAC system in real time
    Autorzy:
    Gulan, M.
    Salaj, M.
    Rohal’-Ilkiv, B
    Powiązania:
    https://bibliotekanauki.pl/articles/229355.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    predictive control
    multivariable systems
    constrained optimization
    HVAC system
    cascade control
    Opis:
    This paper presents the application of a Multivariable Generalized Predictive Controller (MGPC) for simultaneous temperature and humidity control in a Heating, Ventilating and Air- Conditioning (HVAC) system. The multivariable controlled process dynamics is modeled using a set of MISO models on-line identified from measured input-output process data. The controller synthesis is based on direct optimization of selected quadratic cost function with respect to amplitude and rate input constraints. Efficacy of the proposed adaptive MGPC algorithm is experimentally demonstrated on a laboratory-scale model of HVAC system. To control the airconditioning part of system the designed multivariable predictive controller is considered in a cascade dual-rate control scheme with PID auxiliary controllers.
    Źródło:
    Archives of Control Sciences; 2014, 24, 1; 67-84
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent control for HVAC devices in LCN system
    Autorzy:
    Horynski, M.
    Styla, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/792275.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    intelligent control
    intelligent electric system
    automation system
    HVAC system
    intelligent building
    LCN system
    heating
    ventilation
    air conditioning
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 1
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A statistical approach for selecting buildings for experimental measurement of HVAC needs
    Statystyczna metoda wyboru budynków badawczych na potrzeby analizy systemów HVAC
    Autorzy:
    Malinowski, P.
    Ziembicki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/396766.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    k-means method
    HVAC system performance
    energy consumption
    building characteristics
    metoda k-średnich
    systemy HVAC
    zużycie energii
    charakterystyka energetyczna budynków
    Opis:
    This article presents a statistical methodology for selecting representative buildings for experimentally evaluating the performance of HVAC systems, especially in terms of energy consumption. The proposed approach is based on the k-means method. The algorithm for this method is conceptually simple, allowing it to be easily implemented. The method can be applied to large quantities of data with unknown distributions. The method was tested using numerical experiments to determine the hourly, daily, and yearly heat values and the domestic hot water demands of residential buildings in Poland. Due to its simplicity, the proposed approach is very promising for use in engineering applications and is applicable to testing the performance of many HVAC systems.
    W artykule przedstawiono statystyczną metodę wyboru budynków reprezentatywnych pod względem charakterystyki energetycznej oraz cech wbudowanych systemów grzewczych wentylacyjnych i klimatyzacyjnych. Proponowane podejście opiera się na metodzie k-średnich. Algorytm dla tej metody jest stosunkowo prosty, co pozwala na łatwe wdrożenie i nie wymaga dużego nakładu (kosztu) obliczeniowego. Sposób ten może być stosowany dla dużych ilości danych. Metodą k-średnich badano dane pozyskane w czasie inwentaryzacji obiektów oraz w wyniku symulacji komputerowych funkcjonowania budynków, zawierające m.in. roczne wartości zapotrzebowania na ciepło (symulowane z krokiem czasowym godzinnym). Z uwagi na względną prostotę metodyki oraz uzyskane bardzo dobre wyniki, proponowane podejście jest bardzo obiecujące dla zastosowań technicznych, w tym analiz budynków pod kątem systemów HVAC.
    Źródło:
    Civil and Environmental Engineering Reports; 2017, No. 24(1); 101-118
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Systemy zarządzania informacja o budynku jako przyszłość metod komputerowego wspomagania projektowania
    Building information management systems as a future of the computer-aided design methods
    Autorzy:
    Bartkiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/362784.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Fizyki Budowli Katarzyna i Piotr Klemm
    Tematy:
    zarządzanie informacją o budynku
    projektowanie zintegrowane
    symulacja i modelowanie
    komputerowe wspomaganie projektowania
    systemy HVAC w budynkach
    information on building management
    integrated design
    simulation and modeling
    computer-aided design
    HVAC system in the building
    Opis:
    W niniejszym referacie przedstawiono stan prac nad systemami zarządzania informacją o budynku. Wskazano na duże znaczenie niniejszego podejścia na przyszłość projektowania ze szczególnym uwzględnieniem metod komputerowego wspomagania zintegrowanego projektowania bydynków.
    The future of Computer Aid Design Tools was presented in the Paper. New technology and technics of describing building structure, HVAC systems will be implemented in designer`s tool very soon. IFC Technology is good example of application of complex information management into object-oriented building structure approach.
    Źródło:
    Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 2, 2; 7-10
    1734-4891
    Pojawia się w:
    Fizyka Budowli w Teorii i Praktyce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PV/T Systems for Renewable Energy Storage: A Review
    Autorzy:
    Avijit, Mallik
    Hasan, Md. Zahid
    Powiązania:
    https://bibliotekanauki.pl/articles/1177985.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    HVAC
    PV/T System
    Solar Heat Radiation
    Solar Power
    Thermal Energy System
    Opis:
    Sunlight is converted into electricity and heat simultaneously with the help of PV thermal panels. It is examined that the efficiency of the PV/T panel is higher than the separate PV panels and solar thermal collectors’ efficiency. The electricity conversion-efficiency for a PV system is about 6% to 15% and in moreover cases 85% of the incoming solar energy is either reflected or absorbed as heat energy. Now a day’s Renewable energy has become a hot topic. The energy researchers day by day making advanced researches to make this type of system a useable one. Non-renewable sources will be approximately finished within next 100-150 years. So this type of energy is very important for everyone. Normally researches are made on producing electricity from renewable sources like sun-light, wind energy, tidal energy and etc. In this paper there is a compact review of solar photovoltaic thermal system. The performance of the solar cell decreases with the increasing of temperature. Both the electrical efficiency and the power output of PV module depend on the operating temperature. Photovoltaic thermal hybrid solar collectors, also known as hybrid PV/T systems are systems in which sunlight is converted into thermal and electrical energy both. This paper contains a combination of basic and advanced hybrid PV/T systems that are usable in Asian region.
    Źródło:
    World Scientific News; 2018, 96; 83-95
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Techno-economic Assessment of Retrofitting Heating, Ventilation, and Air Conditioning System – Case Study
    Autorzy:
    Alsalem, Yazan
    Ayadi, Osama
    Asfar, Jamil Al
    Powiązania:
    https://bibliotekanauki.pl/articles/24201603.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    retrofitting HVAC
    boiler system
    LCCA
    life cycle cost analysis
    GHG emissions
    greenhouse gas emissions
    VRF system
    variable refrigerant flow
    energy audit
    Opis:
    Retrofitting heating, ventilation, and air conditioning (HVAC) systems in existing buildings and applying energy-efficient technologies can significantly reduce energy consumption and greenhouse gases emissions. In this work, two options of HVAC retrofitting were proposed and discussed for the existing heating system of school of engineering at the University of Jordan as a case study. The experimental tests showed that only one of the three diesel boilers work normally while the other two boilers are not efficient, with actual efficiency of 25%. The first retrofitting was to upgrade the existing heating system to a liquefied petroleum gas (LPG) boiler system with estimated annual saving of 29,757 Jordanian dinar (JOD), and a payback period of 3.9 years. The second option for retrofitting was a new HVAC system for the building including heating and air conditioning with a variable refrigerant flow (VRF) system and heat pump chiller. The estimated cost showed that the VRF system was the lowest one in running cost in winter. The diesel boilers had the highest greenhouse gas emissions with an average value of 377.3 tons of CO2 per year, while LPG boilers achieved the second highest emissions of around 279 tons of CO2 per year, whereas the heat pump chiller in winter produced 199 tons of CO2 and the VRF system emitted 180 tons in winter. The LCCA economic analysis was performed for the proposed systems, showing that the LPG boilers system was more feasible than the diesel boilers system, while the VRF system was more feasible than the heat pump chiller system.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 153--168
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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