Temat: temperature efficiency

Skocz do pozycji: 1.

Tytuł:: Temperature efficiency of heat exchangers in air handling units
Autorzy:: Michalak, Piotr
Grygierczyk, Stanisław
Tematy:: ventilation
heat recovery
rotary heat exchanger
cross-flow heat exchanger
temperature efficiency
PN-EN 308
wentylacja
odzysk ciepła
obrotowy wymiennik ciepła
krzyżowy wymiennik ciepła
sprawność temperaturowa; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/95368.pdf Link otwiera się w nowym oknie
Opis:: In order to reduce ventilation heat loss and improve energy efficiency of low-energy buildings air-handling units (AHUs) with heat recovery are used. The article presents results of surveys performed in a passive building located in Katowice concerning the temperature efficiency of heat and cold recovery of two selected AHUs, with different heat exchangers. For this purpose the measurement data from the Building Management System (BMS) for the period 1.08.2015-31.07.2016 were used. The first unit was equipped with a rotary heat exchanger. Its average annual temperature efficiency of heat recovery was 47.2% annually. The efficiency of cold recovery amounted 52.9% on average for the warm half year. The second unit had a cross-flow exchanger. The average annual temperature efficiency of heat recovery in this device was 80.1%. The efficiency of cold recovery amounted 57.2% on average for the warm half year. Additional remarks concerning the temperature measurement in analysed units were also given.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Simulation of the efficiency of improved regenerative decentralised ventilators Vents Twin Fresh
Autorzy:: Mileikovskyi, Viktor
Vakulenko, Daria
Tematy:: heat regeneration
heat recovery
CFD
temperature coefficient of efficiency
regeneracja ciepła
odzysk ciepła
temperaturowy współczynnik sprawności; Pokaż więcej
Wydawca:: Politechnika Częstochowska
Powiązania:: https://bibliotekanauki.pl/articles/2065593.pdf Link otwiera się w nowym oknie
Opis:: The work is devoted to modelling Twin Fresh ventilator efficiency. The main aim is to simulate heat exchanged in a heat regenerator in variable conditions. The mathematical model is based on Navier-Stokes equations for laminar flow. The model is designed to achieve an adequate time for calculation and sufficient precision. The results show high efficiency of heat recovery in the order of 97.4%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The exergetic analysis for predicting of energy efficiency of the hydraulic drive systems
Prognozirovanie ehnergoeffectivnosti sistemy gidroprivoda na osnove ehksergeticheskogo analiza
Autorzy:: Yakhno, O.
Gubarev, A.
Ganpantsurova, O.
Murashhenko, A.
Tematy:: hydraulic drive
hydraulic calculation
temperature
viscosity
energy efficiency; Pokaż więcej
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:: https://bibliotekanauki.pl/articles/77647.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The impact of high temperatures on the work of a firefighter in Nomex protective gear
Autorzy:: Dwornik, Tadeusz
Binkowska, Aneta
Tematy:: Firefighters
high temperature
hyperthermia
protective gear
Nomex
efficiency; Pokaż więcej
Wydawca:: Towarzystwo Pomocy Doraźnej
Powiązania:: https://bibliotekanauki.pl/articles/13925525.pdf Link otwiera się w nowym oknie
Opis:: INTRODUCTION: For firefighters to respond effectively and safely in challenging situations, their protective gear must offer maximum protection, comfort, and ergonomics. While this gear protects against high temperatures, it can pose risks in other scenarios. Specialised attire safeguards against fires but can be perilous in localised threats, potentially life-threatening. This is associated with increased internal body temperature, causing rapid breathing, elevated heart rate, increased blood flow and pressure, substantial sweating, and loss of essential elements. The study aimed to compare physical stress levels at high and low ambient temperatures and examine the variations in measured parameters. MATERIAL AND METHODS: This study assesses how working in high temperature conditions wearing firefighter gear affects physical and psychological abilities and recovery between tasks. It evaluates participants' well-being before and after the study, years of service, protective gear comfort, fluid intake, alternatives to standard gear, and recovery time. It uses questionnaires and measurements of vital signs (body temperature, weight, blood pressure, oxygen saturation, heart rate) before and after physical exertion. RESULTS: A total of 152 participants participated in this study, with 30 during the winter season and 122 in the summer. The human body releases heat through convection, conduction, radiation, and evaporation. Maintaining normothermia is challenging at high temperatures. In summer, participants' weight increased due to sweating. After exertion, blood pressure diverged significantly, with the summer group showing a notable increase in systolic pressure, which stressed the need for hydration. Blood oxygen levels increased during exertion but normalised after rest. Pulse rates were similar at rest but significantly increased in the summer group after exertion, highlighting the importance of caution and hydration at high temperatures. CONCLUSIONS: Analysis of collected data, including medical assessments and surveys, clearly demonstrates the significant impact of working in high temperature conditions on the vital parameters of the participants. Prolonged heat exposure, primarily due to the insulating properties of specialised gear and resulting thermal discomfort, accelerates fatigue and exhaustion. This, in turn, leads to increased errors, slower responses, and potential health problems. To address this concern, the introduction of lighter uniform options, adjustments to legal regulations, and the inclusion of overheating risks in medical protocols should be considered as preventive measures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Exergy based analysis of solar air heater duct with W-shaped rib roughness on the absorber plate
Autorzy:: Patel, Sumer Singh
Lanjewar, Atul
Tematy:: solar air heater
W-shape rib
exergetic efficiency
Reynolds number
thermal efficiency
temperature rise parameter; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240081.pdf Link otwiera się w nowym oknie
Opis:: Exergy analysis is a powerful thermodynamic tool and it helps in computing the actual output of a system. It helps the researchers to optimize the roughened solar air heater design to compensate the present and also the future needs. In this study, investigation on exergetic performance evaluation of a solar air heater with W-shaped roughened absorber surface analytically by employing mathematical model and the results obtained are compared with smooth plate solar air heater under same operating conditions. The exergetic efficiency curves has been plotted as a function of different values of Reynolds number and temperature rise parameter for different roughness parameters. The maximum augmentation in the exergetic efficiency of the solar air heater with W-shaped roughened surface as compared to solar air heater with smooth surface has been obtained as 51% corresponding to the relative roughness height of 0.03375 and the rib angle of attack about 60°. Based on the exergetic efficiency the suitable design parameters of solar air heater with W-shaped roughened are determined.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Ehnergoehffektivnoe ustrojjstvo infrakrasnojj sushki vinogradnojj vyzhimki v nepreryvno dvizhushhemsja sloe
Energy efficiency unit of infrared drying of grape pomace in a continuously moving layer
Autorzy:: Zavalijj, A.
Rutenko, V.
Krivoruchko, C.
Tematy:: energy efficiency
pomace
fluid drying
temperature control
belt conveyor system; Pokaż więcej
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:: https://bibliotekanauki.pl/articles/77554.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Low temperature district heating using waste heat from biogas plant
Autorzy:: Cenian, A.
Noch, T.
Tematy:: low-temperature district-heating network
biogas installation
co-generation
energy efficiency; Pokaż więcej
Wydawca:: Gdańska Szkoła Wyższa
Powiązania:: https://bibliotekanauki.pl/articles/1190191.pdf Link otwiera się w nowym oknie
Opis:: A biogas plant can be a source of waste-heat flows with different thermal parameters. Application of such flows in local, low-temperature district-heating networks is a very attractive option for highly efficient, energetically and economically, co-generation systems applying biogas as the primary energy source.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Experimental Study of Temperature Influence on the Performance of PV/T Cell under Jordan Climate Conditions
Autorzy:: Al-Odat, Mohammed Qassim
Tematy:: PV module
electrical conversion
electrical efficiency
water cooling
cooling
cell temperature; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/2202185.pdf Link otwiera się w nowym oknie
Opis:: The electrical performance and the productivity of PV module depend on two main parameters, i.e. the radiation intensity and the cell operating temperature. The module electrical efficiency and productivity are significantly reduced as its temperature increases. Accordingly, cooling of PV modules is one of the most effective techniques to obtain higher efficiency and productivity as well as to reduce the degradation modes of PV modules due to high temperatures. This research work presents an experimental study carried out to investigate the effect of PV module cooling on the performance of PV module under Irbid city (Jordan) climate conditions. It was found that the electrical efficiency and the productivity of the PV modules were approximately enhanced by 14%. Therefore, water cooling of the PV modules is essential to enhance their performance.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Temperature-driven trade-off between mitochondrial activity and efficiency in live rotifers representing different thermal histories
Autorzy:: Burzawa, Agata
Walczyńska, Aleksandra
Sokolova, Inna M.
Potera, Katarzyna
Sokolov, Eugene P.
Opis:: Mitochondria generate up to 90% of cellular ATP, making it critical to understand how abiotic factors affect mitochondrial function under varying conditions. Using clones of the rotifer Lecane inermis with known thermal preferences, we investigated mitochondrial bioenergetic responses to four thermal regimes: standard temperature, optimal temperature, low suboptimal temperature and high suboptimal temperature. The study aimed to determine how mitochondrial parameters in intact organisms vary with temperature shifts and whether these responses differ across experimental populations. We assessed key bioenergetic parameters: routine respiration (representing overall metabolic rate), electron transport system capacity (indicative of oxidative phosphorylation potential) and proton leak rates (reflecting the energetic costs of maintaining mitochondrial membrane potential). Our results showed that populations with different thermal preferences displayed distinct mitochondrial responses to temperature changes, particularly at suboptimal temperatures. In contrast, responses were more uniform under standard and optimal conditions. Our findings demonstrated that metabolic plasticity in changing environments often involves trade-offs between mitochondrial efficiency and maintenance. By studying mitochondrial respiration at the whole-organism level, we revealed the complex temperature dependence of bioenergetic traits, providing insights beyond isolated mitochondria studies. This research highlights how a cascade of plastic responses spanning from mitochondrial responses to overall growth patterns is triggered by temperature changes, offering a valuable perspective in the context of global warming and organismal adaptation.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Vlianie temperatury okruzausej sredy na velicinu eksergeticeskogo KPD glavnogo dvigatela
The Influence of Ambient Temperature on the Efficiency Factor of Main Engine Operation
Autorzy:: Behrendt, C.
Motornyj, A.
Tematy:: EXPLO-SHIP 2004
marine power plant
main engine
efficiency factor
ambient temperature; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/359702.pdf Link otwiera się w nowym oknie
Opis:: The factor of thermal efficiency, used for the assessement of the use of heat in the diesel engine working cycles, has been based on the the first law of thermodynamics only. This paper indicates the fact that to achieve more comprehensive thermodynamic analyses it is necessary to use factors based on the two laws of thermodynamics. One such factor herein proposed is the exoergic efficiency. The method for the determination of this factor for the main engine is presented. Original relations involving the exoergic efficiency are set out. The factor depends on the ambient temperature.
Dostawca treści:: Biblioteka Nauki

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