Design Thermal Comfort in Greenhouses Environment

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Abdeen Mustafa Omer
Keyword(s):  
Carbon Dioxide ◽  
Relative Humidity ◽  
Natural Resources ◽  
Air Conditioning ◽  
Atmospheric Carbon Dioxide ◽  
Climate Science ◽  
Meteorological Conditions ◽  
Controlled Environment ◽  
Business Opportunities ◽  
Farming Industry

The move towards a de-carbonised world, driven partly by climate science and partly by the business opportunities it offers, will need the promotion of environmentally friendly alternatives, if an acceptable stabilisation level of atmospheric carbon dioxide is to be achieved. This requires the harnessing and use of natural resources that produce no air pollution or greenhouse gases and provides comfortable coexistence of human, livestock, and plants. This study reviews the energy-using technologies based on natural resources, which are available to and applicable in the farming industry. Among these are greenhouses, which are necessary for the growth of some plants (i.e., vegetables, flowers, etc.) in severe climates. However, greenhouses require some air conditioning process to control their temperature and relative humidity to suit specific plants. To achieve this, a novel air humidifier and/or dehumidifier systems using mop fans had been designed and employed in an experimental greenhouse to evaluate its performance under a controlled environment. This device helped to reduce the energy consumption of the greenhouse whilst providing a pleasant environment for the plants inside the greenhouse. The system was designed taking into account the meteorological conditions, which affect the environment inside the greenhouse. The performance of the system was monitored over a period of time by measuring the temperature and relative humidity of the greenhouse. Results of the monitoring have shown that the system was able to provide comfortable conditions (temperatures of 16- 26oC and relative humidity of 65%) suitable for the plants grown in the experimental greenhouse. It also enabled the minimisation of temperature variation and, hence, avoided the hazard of any sudden climatic change inside the greenhouse.

scholarly journals Design Thermal Comfort in Greenhouses Environment

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Abdeen Mustafa Omer
Keyword(s):  
Carbon Dioxide ◽  
Relative Humidity ◽  
Natural Resources ◽  
Air Conditioning ◽  
Atmospheric Carbon Dioxide ◽  
Climate Science ◽  
Meteorological Conditions ◽  
Controlled Environment ◽  
Business Opportunities ◽  
Farming Industry

The move towards a de-carbonised world, driven partly by climate science and partly by the business opportunities it offers, will need the promotion of environmentally friendly alternatives, if an acceptable stabilisation level of atmospheric carbon dioxide is to be achieved. This requires the harnessing and use of natural resources that produce no air pollution or greenhouse gases and provides comfortable coexistence of human, livestock, and plants. This study reviews the energy-using technologies based on natural resources, which are available to and applicable in the farming industry. Among these are greenhouses, which are necessary for the growth of some plants (i.e., vegetables, flowers, etc.) in severe climates. However, greenhouses require some air conditioning process to control their temperature and relative humidity to suit specific plants. To achieve this, a novel air humidifier and/or dehumidifier systems using mop fans had been designed and employed in an experimental greenhouse to evaluate its performance under a controlled environment. This device helped to reduce the energy consumption of the greenhouse whilst providing a pleasant environment for the plants inside the greenhouse. The system was designed taking into account the meteorological conditions, which affect the environment inside the greenhouse. The performance of the system was monitored over a period of time by measuring the temperature and relative humidity of the greenhouse. Results of the monitoring have shown that the system was able to provide comfortable conditions (temperatures of 16- 26oC and relative humidity of 65%) suitable for the plants grown in the experimental greenhouse. It also enabled the minimisation of temperature variation and, hence, avoided the hazard of any sudden climatic change inside the greenhouse.

Analytical Studies of Energy Efficiency Development of the Greenhouses

2021 ◽  
pp. 1-20
Author(s):  
Abdeen Mustafa Omer ◽  
Keyword(s):  
Carbon Dioxide ◽  
Air Pollution ◽  
Energy Efficiency ◽  
Relative Humidity ◽  
Air Conditioning ◽  
Atmospheric Carbon Dioxide ◽  
Climate Science ◽  
Meteorological Conditions ◽  
Controlled Environment ◽  
Business Opportunities

The move towards a de-carbonised world, driven partly by climate science and partly by the business opportunities it offers, will need the promotion of environmentally friendly alternatives, if an acceptable stabilisation level of atmospheric carbon dioxide is to be achieved. The use of natural resoucses that have not any air pollution or greenhouse gases and provides comfortable coexistence of human, livestock, and plants. The greenhouses require air conditioning process to control their temperature and relative humidity to suit specific plants. To achieve this goal, a novel air humidifier and/or dehumidifier systems using mop fans had been designed and employed in an experimental greenhouse to evaluate its performance under a controlled environment. The mop fan help to reduce the energy consumption of the greenhouse whilst providing a pleasant environment for the plants inside the greenhouse. The system was designed taking into account the meteorological conditions, which affect the environment inside the greenhouse. The performance of the system was monitored over a period of time by measuring the temperature and relative humidity of the greenhouse. Results of the monitoring have shown that the system was able to provide comfortable conditions (temperatures of 16-26oC and relative humidity of 65%) suitable for the plants grown in the experimental greenhouse. This device enable to minimse the temperature variation and, hence, avoided the hazard of any sudden climatic change inside the greenhouse

Ventilation with Air Conditioning in Modern Buildings

1937 ◽  
Vol 135 (1) ◽  
pp. 171-220 ◽  
Author(s):  
E. R. Dolby
Keyword(s):  
Carbon Dioxide ◽  
Relative Humidity ◽  
Air Conditioning ◽  
Ideal Condition ◽  
Special Importance ◽  
Case Examples ◽  
Air Supply ◽  
The Ideal

It is only comparatively recently that the realization of the desirability of a supply of pure air in buildings has been put into practice. In the early attempts to improve the air conditions in buildings it was thought that the mere admission of external air in sufficient quantity might suffice, but that was soon found to be inadequate. The ideal condition of the air suggested by the author is a temperature of 60 deg. F., a relative humidity of 50 per cent, and not more than 6 or 7 parts per 10,000 by volume of carbon dioxide. The air treated should also have dust, fog, and deleterious gases removed. The author describes mechanical means for air conditioning and indicates the method of calculating the amount of conditioned air required in any given case. Examples of some typical installations are also illustrated. Filters for the removal of dust are of special importance in certain industries. Dry filters are very effective, but are expensive. In most cases the use of a viscous filter suffices. The paper concludes with descriptions of various types of instruments for measuring humidity, a special type of centrifugal refrigerator for cooling the air delivered into buildings which uses dichloromethane as a refrigerant, and apparatus for ozonizing the air supply.

scholarly journals Responses of Metabolites in Soybean Shoot Apices to Changing Atmospheric Carbon Dioxide Concentrations

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Richard Sicher
Keyword(s):  
Carbon Dioxide ◽  
Atmospheric Carbon Dioxide ◽  
Controlled Environment ◽  
Carbon Dioxide Enrichment ◽  
Shoot Apices ◽  
Soybean Seedlings ◽  
Partial Pressures ◽  
Carbon Dioxide Concentrations ◽  
Reciprocal Transfer ◽  
Unidentified Metabolite

Soybean seedlings were grown in controlled environment chambers with CO2partial pressures of 38 (ambient) and 72 (elevated) Pa. Five or six shoot apices were harvested from individual 21- to 24-day-old plants. Metabolites were analyzed by gas chromatography and, out of 21 compounds, only sucrose and fructose increased in response to CO2enrichment. One unidentified metabolite, Unk-21.03 decreased up to 80% in soybean apices in response to elevated CO2. Levels of Unk-21.03 decreased progressively when atmospheric CO2partial pressures were increased from 26 to 100 Pa. Reciprocal transfer experiments showed that Unk-21.03, and sucrose in soybean apices were altered slowly over several days to changes in atmospheric CO2partial pressures. The mass spectrum of Unk-21.03 indicated that this compound likely contained both an amino and carboxyl group and was structurally related to serine and aspartate. Our findings suggested that CO2enrichment altered a small number of specific metabolites in soybean apices. This could be an important step in understanding how plant growth and development are affected by carbon dioxide enrichment.

scholarly journals Evaluation of carbon dioxide released by bread dough during proving stage

2020 ◽  
Vol 180 ◽  
pp. 03012
Author(s):  
Adriana Istudor ◽  
Gheorghe Voicu ◽  
Gheorghe Muscalu ◽  
Paula Tudor
Keyword(s):  
Carbon Dioxide ◽  
Relative Humidity ◽  
Air Conditioning ◽  
Fermentation Process ◽  
Temperature Sensors ◽  
White Bread ◽  
Automated Control ◽  
Bread Dough ◽  
Working Parameters ◽  
Small Capacity

This study presents the analysis of multiple bread dough proving processes with the purpose of establishing a correlation between the concentration of released carbon dioxide during fermentation and the working parameters (time and temperature). The testing was performed using a standard recipe for white bread dough, a small capacity prover with air conditioning unit for temperature and relative humidity regulation, CO2 and temperature sensors with data acquisition plate. In the first part are presented the results for 11 measurements of CO2 concentration for one dough piece fermentation process at varying proving temperatures. In the second part of the paper are presented the results of 4 measurements of CO2 for 9 dough pieces proving at temperatures between 30 and 39 °C, at 3°C intervals. The obtained measurements of CO2 were correlated with the volume and dimensions of the finished products. The obtained results are considered relevant for this study and for the possibility of fermentation level evaluation using the quantity of CO2 released during proving. The presented study is part of an extensive research performed for the identification of a method for automated control of working regime in industrial bread dough provers using the measurements of released CO2.

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