scholarly journals The Potential of Solar Air Heating in the Turkish Industrial Sector

2018 ◽  
Vol 63 (1) ◽  
pp. 57-66
Author(s):  
Balázs Bokor ◽  
Hacer Akhan ◽  
Dogan Eryener ◽  
László Kajtár
Keyword(s):  
Solar Radiation ◽  
Energy Savings ◽  
Measurement Data ◽  
Industrial Sector ◽  
Climatic Conditions ◽  
Cold Climate ◽  
Conventional Heating ◽  
Industrial Building ◽  
High Solar Radiation ◽  
Mathematical Correlation

Transpired solar collector (TSC) systems are simple solutions for the preheating of ventilation air with solar energy. Their performance is a function of several environmental factors, so the climatic conditions of the location play an important role. In this paper, the effect of different climatic zones on the thermal performance of the TSC is investigated. To exclude other sources of influence, the same reference industrial building is examined in four Turkish locations (Antalya, Istanbul, Ankara and Sivas) representing different climatic conditions. RETScreen simulation is carried out for all four regions to obtain the drop of conventional heating requirement in case absorber azimuth of 0°, 45° and 90°. To illustrate the performance, temperature rise, heating energy savings and annual solar fraction are presented. Generally, it can be stated that a location with cold climate and high solar radiation at the same time benefits most from the use of a TSC system. A mathematical correlation has been found showing the solar fraction's dependence on solar radiation and heating degree days. Finally, simulation results have been compared to a set of measurement data from an industrial building's TSC system near Istanbul.

Impact of climatic conditions on fumonisins in maize grown in Serbia

2019 ◽  
Vol 12 (2) ◽  
pp. 183-190 ◽  
Author(s):  
B. Udovicki ◽  
I. Djekic ◽  
S. Stankovic ◽  
A. Obradovic ◽  
A. Rajkovic
Keyword(s):  
Solar Radiation ◽  
Critical Parameter ◽  
Meteorological Data ◽  
Climatic Conditions ◽  
Chi Square ◽  
High Solar Radiation ◽  
Significant Difference ◽  
Chi Square Test ◽  
Low Humidity ◽  
Low Precipitation

The influence of climatic conditions on the levels of fumonisins in maize grown in Serbia was studied over eight years (2008 to 2015), investigating the possible relationship between the levels of fumonisins contamination in maize in relation to registered weather/climatic conditions. Presence of these mycotoxins in maize after harvest was evaluated based on climatic conditions within two periods: 10 days before and 10 days after 50% silking. Categories of fumonisins levels were transformed into classes. Chi-square test for association was used in analysing relationships between results of fumonisins levels and calendar years. Mann-Whitney U-test was used to compare differences between meteorological data of two subsets in years with high and low fumonisins level. There was a statistically significant association between the fumonisins levels and calendar years χ2=247.954; (P<0.05). This study identified low precipitation and low humidity combined with high solar radiation as a critical parameter combination for elevated levels of fumonisins. The statistically significant difference in relation to some of the examined parameters suggests that maize in Serbian agro-climatic conditions is more susceptible to fungal colonisation, and subsequent fumonisin production in the period of 10 days before 50% silking.

PSVIII-13 Are the heat stress days increasing in central northern Mexico?

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 425-426
Author(s):  
Rafael Rodriguez-Martinez ◽  
Jesús Salvador Rivas-Madero ◽  
Pedro Antonio Robles-Trillo ◽  
César A Meza-Herrera ◽  
Rafael Rodriguez-Venegas
Keyword(s):  
Heat Stress ◽  
Solar Radiation ◽  
Climatic Conditions ◽  
Central Mexico ◽  
North Central ◽  
Northern Mexico ◽  
Lactating Cows ◽  
High Solar Radiation ◽  
Humidity Index ◽  
Dangerous Level

Abstract The Lagunera region, located in north central Mexico (24° 01′-26° 48 ‘LN and 101° 52′-101° 52′ 104° 40′ LO), produce the 21% of the national Mexican cow’s milk despite its climatic conditions (temperatures that fluctuate between 12.7 °C in January and 28.5 °C in June, with extremes of -5 °C and 41.5 °C, in addition to high solar radiation). The Temperature Humidity Index (THI) is the most useful indicator to define if there are heat stress conditions. To identify whether the days in which THI ≥68 (considering the threshold for signs of heat stress to appear in high-producing lactating cows) are increasingly reached at least one hour a day, the information of this indicator was recorded every 10 min daily, from 5 cow farms for 6 years (2015–2020), using the DiGiTH™ application (DiGiTH Technologies, Mexico), and regressions were run to identify if there is a relationship between the years of study and the THI levels. At any level of THI (≥68), there is a tendency to increase the number of days (10.05 d per year; R2 0.37); Disaggregating the data by THI level, this trend is also observed for levels 68 to 71 and 72 to 76 THI, registering an increase of 11.33 d (R2 0.45) and 9.03 d per year (R2 0.45) respectively. At the 77 - 79 THI level there is no trend, while at the ≥80 THI level, a decrease of 5.66 d per year was registered (R2 0.79). The results suggest that in this region, the days of heat stress are increasing, except for the level ≥80 THI, which indicates that palliative measures for heat stress should be intensified, and it is necessary to identify the reason for the decrease in heat stress days at the most dangerous level for livestock.

scholarly journals Analysis of the Performance of a Passive Downdraught Evaporative Cooling System Driven by Solar Chimneys in a Residential Building by Using an Experimentally Validated TRNSYS Model

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3486
Author(s):  
Andrés Soto ◽  
Pedro Martínez ◽  
Victor M. Soto ◽  
Pedro J. Martínez
Keyword(s):  
Natural Ventilation ◽  
Energy Savings ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Residential Building ◽  
Climatic Conditions ◽  
Cold Climate ◽  
Humid Climate ◽  
Combined Model ◽  
Evaporative Cooling System

Natural ventilation, combined with a passive cooling system, can provide significant energy savings in the refrigeration of indoor spaces. The performance of these systems is highly dependent on outdoor climatic conditions. The objective of this study was to analyse the feasibility of a passive, downdraught, evaporative cooling system driven by solar chimneys in different climatic zones by using an experimentally validated simulation tool. This tool combined a ventilation model and a thermal model of the dwelling in which an empirical model of a direct evaporative system made of plastic mesh was implemented. For experimental validation of the combined model, sensors were installed in the dwelling and calibrated in the laboratory. The combined model was applied to Spanish and European cities with different climates. In the simulation, values of cooling energy per volume of air ranging between 0.53 Wh/m3 and 0.79 Wh/m3 were obtained for Alicante (hot climate with moderate humidity) and Madrid (hot and dry climate), respectively. In these locations, medium and high applicability was obtained, respectively, in comparison with Burgos (cold climate with moderate humidity) and Bilbao (cold and humid climate), which were low. The evaluation of the reference building in each location allowed establishing a classification in terms of performance, comfort and applicability for each climate.

scholarly journals The Semitransparent Photovoltaic Films for Mediterranean Greenhouse: A New Sustainable Technology

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Alvaro Marucci ◽  
Danilo Monarca ◽  
Massimo Cecchini ◽  
Andrea Colantoni ◽  
Alberto Manzo ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Climatic Conditions ◽  
Northern Europe ◽  
Visible Range ◽  
Photovoltaic Materials ◽  
Long Wave ◽  
High Solar Radiation ◽  
Mediterranean Countries ◽  
Photovoltaic Films ◽  
Long Wave Infrared

Mediterranean countries offer very favorable climatic conditions for growing plants in a protected environment: as a matter of fact, the high solar radiation allows the use of greenhouses with simple structures, covered with plastic film and without fixed installations for winter heating. They are called “Mediterranean greenhouses” and are totally different from those in Central and Northern Europe. In the photovoltaic greenhouses, the cover on the pitch facing south is usually replaced by very opaque panels. However, this solution compromises the possibility to grow plants in covered and protected environments since solar radiation availability is limited and strongly nonuniform. In order to overcome this problem, semitransparent photovoltaic materials can be used to let the solar energy, necessary for plant growth, pass into the green house. The aim of this research is to analyze the radiometric properties of innovative semitransparent flexible photovoltaic materials in order to evaluate their performances in comparison with materials commonly used in the coverage of the greenhouses. Particular attention is paid to the transmittance of these materials in the visible range and in the long wave infrared for the achievement of greenhouse effect.

scholarly journals Autonomous complex for electro-thermal heating of oil wells fed by a photovoltaic installation

2021 ◽  
Vol 266 ◽  
pp. 04006
Author(s):  
Y.E. Shklyarskiy ◽  
V.V. Starshaya
Keyword(s):  
Solar Radiation ◽  
Energy Savings ◽  
Electricity Consumption ◽  
Reducing Power ◽  
Oil Production ◽  
Electric Heating ◽  
Climatic Conditions ◽  
Total Solar Radiation ◽  
Oil Well ◽  
Solar Panels

Paraffin deposits are a serious problem causing complications in oil production. This article describes the creation of a complex operatingonphotovoltaic installations to combat paraffin deposits. The authors offer an innovative method for accurate calculation of the parameters of photovoltaic installations, taking into account changes in total solar radiation, geographical and climatic conditions, the angle of inclination of solar panels, characteristics of the power source, and oil parameters. Measurements of solar radiation are carried out on the basis of mathematical and simulation modeling in Matlab Simulink. The results of the studies confirm the adequacy of the proposed method of oil well heating. This method of electric heating has a simple design and does not require underground works and well shutdown. Thus, it will improve the efficiency of oil production, prevent the formation of paraffin deposits, and ensure energy savings by reducing power losses and electricity consumption.

scholarly journals Proposal to Refine Solar Radiation of Typical Meteorological Year Database and Evaluation on the Influence of Air-Conditioning Load

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 524
Author(s):  
Jihui Yuan ◽  
Kazuo Emura ◽  
Craig Farnham
Keyword(s):  
Solar Radiation ◽  
Air Conditioning ◽  
Energy Savings ◽  
Energy Resource ◽  
Global Solar Radiation ◽  
Resource Assessment ◽  
Weather Data ◽  
Diffuse Solar Radiation ◽  
Chinese Standard ◽  
The Impact

The Typical meteorological year (TMY) database is often used to calculate air-conditioning loads, and it directly affects the building energy savings design. Among four kinds of TMY databases in China—including Chinese Typical Year Weather (CTYW), International Weather for Energy Calculations (IWEC), Solar Wind Energy Resource Assessment (SWERA) and Chinese Standard Weather Data (CSWD)—only CSWD is measures solar radiation, and it is most used in China. However, the solar radiation of CSWD is a measured daily value, and its hourly value is separated by models. It is found that the cloud ratio (diffuse solar radiation divided by global solar radiation) of CSWD is not realistic in months of May, June and July while compared to the other sets of TMY databases. In order to obtain a more accurate cloud ratio of CSWD for air-conditioning load calculation, this study aims to propose a method of refining the cloud ratio of CSWD in Shanghai, China, using observed solar radiation and the Perez model which is a separation model of high accuracy. In addition, the impact of cloud ratio on air-conditioning load has also been discussed in this paper. It is shown that the cloud ratio can yield a significant impact on the air conditioning load.

scholarly journals Stochastic Simulation of Mould Growth Performance of Wood-Frame Building Envelopes under Climate Change: Risk Assessment and Error Estimation

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 333
Author(s):  
Lin Wang ◽  
Maurice Defo ◽  
Zhe Xiao ◽  
Hua Ge ◽  
Michael A. Lacasse
Keyword(s):  
Climate Change ◽  
Risk Assessment ◽  
Error Estimation ◽  
Ventilation Rate ◽  
Climatic Conditions ◽  
Cold Climate ◽  
Mould Growth ◽  
Frame Building ◽  
Wood Frame ◽  
Water Tightness

Previous studies have shown that the effects of climate change on building structures will increase the mould growth risk of the wood-frame building envelope in many circumstances. This risk can be controlled by wind-driven rain deflection, improving water tightness of the exterior facade, and improving cladding ventilation. However, the effectiveness of these risk mitigation strategies are subject to various uncertainties, such as the uncertainties of wall component properties and micro-climatic conditions. The objective of this paper is to apply stochastic hygrothermal simulation to evaluate the mould growth risk of a brick veneer-clad wood-frame wall with a drainage cavity under historical and future climatic conditions of Ottawa, a Canadian city located in a cold climate zone. An extensive literature review was conducted to quantify the range of stochastic variables including rain deposition factor, rain leakage moisture source, cladding ventilation rate and material properties of brick. The randomised Sobol sequence-based sampling method, one of the Randomized Quasi-Monte Carlo (RQMC) methods, was applied for risk assessment and error estimation. It was found that, under the climatic condition of Ottawa, limiting the amount of wind-driven rain to which walls are subjected is a more robust mitigation measure than improving cladding ventilation in controlling mould growth risk, the improving of water tightness of exterior façade is not as robust as wind-driven rain deflection and cladding ventilation, however, the reduction of rainwater penetration can reduce the mould growth risk at different levels of rain deposition factor and cladding ventilation rate.

scholarly journals Exposure to high solar radiation reduces self-regulated exercise intensity in the heat outdoors

2019 ◽  
Vol 199 ◽  
pp. 191-199 ◽  
Author(s):  
Hidenori Otani ◽  
Mitsuharu Kaya ◽  
Akira Tamaki ◽  
Heita Goto ◽  
Ronald J. Maughan
Keyword(s):  
Solar Radiation ◽  
Exercise Intensity ◽  
High Solar Radiation

scholarly journals Growth of plants and productivity of corn in cold climate

2019 ◽  
pp. 19-23
Author(s):  
T. K. Golovko ◽  
И. В. Далькэ ◽  
G. T. Shmorgunov ◽  
A. F. Triandafilov ◽  
A. G. Tulinov
Keyword(s):  
Komi Republic ◽  
Climatic Conditions ◽  
Matter Content ◽  
Cold Climate ◽  
Dry Matter Content ◽  
Corn Hybrids ◽  
Green Mass ◽  
Early Ripening ◽  
Rate Of Photosynthesis ◽  
Academy Of Sciences

Under conditions of a relatively cool and humid growing season in the central agro-climatic region of the Komi Republic, corn is not inferior in terms of growth rate and photosynthetic activity, traditionally cultivated under the conditions of the northern Non-Black Earth region crops. The purpose of the research is to study the possibility and prospects of growing early ripe corn hybrids in the soil and climatic conditions of the Komi Republic. Field experience was established on the basis of the Institute of Agriculture of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences in 2016-2017 on an area of 1.6 hectares. In 2016, 6 varieties of corn were studied, and in 2017, in addition to them, another 15. Thus, out of 21 varieties and hybrids, 7 varieties were selected for further study. The article presents the results of a preliminary study of the ecological testing of early-ripening hybrids of corn when cultivating them in agroclimatic conditions of the Komi Republic. The features of growth and development of corn hybrids, formation of the green mass harvest are considered. As a result of the research, the Uralskiy 150 with the best fodder characteristics was identified among the studied hybrids. Uralsky 150 formed 11-12 leaves with a specific leaf density of 0.30 g/dm2. The LAI of the cenosis was 4 m2/m2. The maximum rate of photosynthesis of the leaves was 17 mol CO /m2s. The average for two years the yield of green mass 2 of the studied variety sample and hybrids of corn was amounted to 380 centner/ha. The dry matter content in biomass did not exceed 20%, the content of crude protein reached 12%, and fiber 29%.

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