The Improvement of Thermal Comfort and Air Quality in the Historic Assembly Hall of a University

Lipska, B.; Trzeciakiewicz, Z.; Ferdyn-Grygierek, Joanna; Popiołek, Zbigniew

doi:10.1177/1420326x11411244

Cited by 15 publications

(11 citation statements)

References 4 publications

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“…Taking into account the summer period and comparing obtained results with the values found in the literature [21][22][23][24][25][26] it can be said that the results were satisfactory. The efficiency of cold recovery was calculated for the warmer half year (IV-IX) because in cold months this mode of HVAC system operation was not used.…”

Section: The Nw4 Unitsupporting

confidence: 52%

“…It meant that air supplied to the building was warmed up by exhaust air in the heat exchanger and heat recovery might have occurred even in summer. After some time, along with the increasing external air temperature, t 11 , t 21 and t 22 became equal. Starting from this moment, the temperature of outside air supplied to the rooms (t 22 ) began to rise above the temperature of exhausted air (t 11 ).…”

Section: Maintenance Remarksmentioning

confidence: 99%

“…These were non working days and the ventilation system was switched off. It would seem that the temperature t 21 should be equal to the ambient temperature. But the temperature sensor (see Fig.…”

Section: Maintenance Remarksmentioning

confidence: 99%

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Temperature efficiency of heat exchangers in air handling units

Michalak

Grygierczyk

2019

Journal of Mechanical and Energy Engineering

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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.

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Section: The Nw4 Unitsupporting

confidence: 52%

Section: Maintenance Remarksmentioning

confidence: 99%

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Temperature efficiency of heat exchangers in air handling units

Michalak

Grygierczyk

2019

Journal of Mechanical and Energy Engineering

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“…For practical considerations, the heating unit is placed at a safe fixed height above the chicks (1 m). The air flow rate and supply temperature were determined from the CFD simulations using ANSYS Airpak, which was used by several researchers to simulate room air distribution and thermal comfort in indoor spaces where air flow is generally incompressible and of low turbulence . The commercial solver, ANSYS Airpak, solves the Navier–Stokes and energy equations:

\frac{\partial ρ}{\partial t} + \nabla . (ρ \overset{true\to}{italicv}) = 0

ρ \frac{D \vec{v}}{D t} = - \nabla p + \nabla \cdot T+f

\frac{\partial}{\partial t} (italicρE) + \nabla . ((ρE + p) \overset{true\to}{italicv}) = \nabla . (k \nabla T - \sum_{j} h_{j} {\overset{J}{true}}_{j} + (T . \overset{true\to}{italicv}))

…”

Section: Problem Formulation and Methodsmentioning

confidence: 99%

Simulation of a localized heating system for broiler brooding to improve energy performance

Mogharbel

Ghali

Ghaddar

et al. 2013

Int. J. Energy Res.

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SUMMARY The aim of this work is to evaluate the performance of an innovative localized solar‐assisted pen heating system for brooding using a 3D computational simulation model of the heated space. The warm air‐curtained pen ensures acceptable temperature, air velocity, relative humidity, and air quality that meet the ventilation and heat requirements for a typical pen of 100 chicks as recommended by the American Society of Heating Refrigeration and Air Conditioning Engineers and American Society of Agricultural and Biological Engineers. The supply flow characteristics and the simulated velocity and temperature field of the curtained region were determined such that they meet the ventilation requirements and comfort criteria. Results show that air supplied at 40°C is capable of delivering the desired microenvironment at bird level while the heat input to the unit is 685 W when outdoor temperature is −5°C. The system's energy performance was then analyzed using a prototype of 16 pens. The energy consumption of the new heating scheme consumed one third of the energy required by conventional non‐localized system. Moreover, integrating the new design with a solar system utilizing parabolic concentrators provided 72% of the power load from solar energy during a winter flock operation and 100% during other seasons. Copyright © 2013 John Wiley & Sons, Ltd.

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“…CFD is used to predict air movement, contamination dispersion, fire and smoke spread and indoor air quality and thermal comfort analysis [1,2]. In many cases, CFD predictions may replace expensive and time-consuming full-scale or model measurements, especially in the case of large enclosures, rooms of complicated geometry and rooms with high internal or solar heat gains [3]. A very detailed review of CFD applications for room air movement is given by Awbi [4].…”

Section: Introductionmentioning

confidence: 99%