Effects of the Rock-Bed Heat Storage System on the Solar Greenhouse Microclimate

2020 ◽  
Vol 19 (6) ◽  
pp. 471-479
Author(s):  
Salah Bezari ◽  
Sidi Mohammed El Amine Bekkouche ◽  
Ahmed Benchatti ◽  
Asma Adda ◽  
Azzedine Boutelhig
Keyword(s):  
Relative Humidity ◽  
Heat Storage ◽  
Positive Impact ◽  
Storage System ◽  
Mediterranean Area ◽  
Climatic Conditions ◽  
System A ◽  
Rock Bed ◽  
Nocturnal Period

The Mediterranean area is characterized by intense radiation generating high temperatures during the day in the greenhouse and low temperatures during the night. The temperature gap problem between the daytime and the nocturnal period which characterizes the region requires the use of greenhouses with a thermal storage system. A greenhouse equipped with a sensible heat storage system using a rock-bed, was compared to a witness one, under the same climatic conditions. Measurements were performed on the microclimate parameters of both greenhouses, such as temperature and relative humidity. Our work is based on an experimental analysis of greenhouse microclimate and evaluating the evolution of temperature and relative humidity prevailing inside the greenhouse. It has been found that the system efficiency is improved due to the storing of heat in excess during the daytime. This stored energy is used during night. The main obtained results showed that the heat storage system allowed an increase in the air temperature up to 0.9℃ and a decrease of the relative humidity about 3.4% during the night compared to the witness greenhouse. The improvement in the heated greenhouse microclimate during night has a very positive impact on the quality of fruit and yield.

scholarly journals Evaluating the Impact of Starter Fertilizer on Winter Canola Grown in Oklahoma

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
M. Joy M. Abit ◽  
Katlynn Weathers ◽  
D. Brian Arnall
Keyword(s):  
Grain Yield ◽  
Nutrient Management ◽  
Climatic Conditions ◽  
Production Costs ◽  
Diammonium Phosphate ◽  
Winter Canola ◽  
System A ◽  
Management Recommendations ◽  
The Impact

Increased canola production costs and acres have driven Oklahoma (OK) farmers to ask more questions about their nutrient management recommendations in their production system. A study was conducted in 2011–2013 at Lahoma and Perkins, OK, to evaluate the effect of applying diammonium phosphate (DAP, 18-20-0:N-P-K) directly with seed on crop stand, grain yield, and grain quality of canola. In addition, the impact of proportion nitrogen (N) applied as a preplant and topdress was also evaluated. Diammonium phosphate was banded with the seed at planting at 0, 17, 34, 51, 67, and 84 kg DAP ha−1. Remaining N was applied as urea (46-0-0) either as split (40% preplant and 60% topdress) application or as topdress only. Stand count reduction of up to 71% was observed with seed-placed DAP. However, loss of stand did not impair grain yield due to canola’s ability to compensate for open areas via branching. Application of DAP of up to 84 kg ha−1 with seed may be possible; however, soil and climatic conditions should be considered when deciding how much DAP will be placed with seed. Moreover, when climatic conditions limit early season growth and favor late spring growth, applying all N at topdress (no preplant) tended to provide greater canola grain yield.

scholarly journals Modelling of an Adsorption Heat Storage System and Study of Operating and Design Conditions

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1885
Author(s):  
Sónia Ferreira ◽  
Sabine Sochard ◽  
Sylvain Serra ◽  
Frederic Marias ◽  
Jean-Michel Reneaume
Keyword(s):  
Heat Supply ◽  
Heat Storage ◽  
Physical Adsorption ◽  
Storage System ◽  
Mass Conservation ◽  
Pilot Scale ◽  
Design Parameters ◽  
Fluid Temperature ◽  
Simplified Approach ◽  
System A

An open system based on physical adsorption phenomena with humid air and zeolite 13X is herein discussed for residential heat storage purposes. A model has been developed to describe the conservation of mass and heat in the system. A simplified approach of a complete model describing both mass conservation in the macroporous and microporous domains is used based on the linear driving force (LDF) model. Local mass and heat transfer properties have been used. To describe the equilibrium, the Aranovich–Donohue isotherm model is selected. As an example, the developed model is compared and fitted to experimental data from a pilot scale system. A parametric study on operating and design parameters is given to understand their effect on the amount and/or duration of heat supply, concentration, and temperature profiles. The studied parameters are the inlet adsorbate concentration, fluid temperature, and velocity, as well as particle and zeolite crystal sizes. This analysis shows that an identification of values for the set of parameters tested can possibly suit the energy needs for a case study of domestic heat supply. Future work will focus on the optimization of these parameters.

scholarly journals Radiation of Heat in an Insulating Vacuum Layer

2017 ◽  
Vol 69 (1) ◽  
pp. 87-100
Author(s):  
Mária Minárová
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Heat Exchange ◽  
Heat Storage ◽  
Storage System ◽  
Heat Accumulation ◽  
Insulating Layer ◽  
System A ◽  
Set Up ◽  
Heat Transfer By Radiation

Abstract The paper is motivated by the previous research concerning the heat transfer in a heat accumulation device. The device had been explored, built up and tested with the aim of utilization of cheap solar energy and its storage. In this heat storage system, a vacuum-like gap between two concentric containers acts as an insulating layer, radiation being the predominant heat transfer type in the gap. The better knowledge and understanding of the heat exchange by radiation, the more effectiveness of the insulation of the layer can be reached. Heat transfer by radiation is explored in the paper, mathematical model is set up, the algorithm of non-linear transient computation is introduced, and some illustrative results of this computation are performed.

scholarly journals 463 Experimental Study on Thermal Performance of Rock Bed Heat Storage System

2005 ◽  
Vol 2005.15 (0) ◽  
pp. 552-555
Author(s):  
Jun SUZUKI ◽  
Satoru NATSUSAKA ◽  
Himsar AMBARITA ◽  
Tosio YUTA ◽  
Mayumi SATOU ◽  
...  
Keyword(s):  
Experimental Study ◽  
Thermal Performance ◽  
Heat Storage ◽  
Storage System ◽  
Rock Bed

scholarly journals Amelioration of the Performance of Glass Solar Still Using Different Absorbers in Adrar

2020 ◽  
Vol 2 (02) ◽  
pp. 137-150
Author(s):  
Bahous Nasri ◽  
Djelloul Benatiallah ◽  
Slimane Kalloum ◽  
Ali Benatiallah
Keyword(s):  
Sheet Metal ◽  
Heat Storage ◽  
Climatic Conditions ◽  
Physical Analysis ◽  
Sensible Heat ◽  
Solar Still ◽  
Quality Of Water ◽  
Heat Storage Materials ◽  
Materials Used

The present work aims at improving the performance of a glass solar still using different new absorbers (enameled sheet metal, blackened sponge, blackened gravel, clay, charcoal and quicklime) as sensible heat storage systems under the desert climatic conditions of Adrar. Most of the solar stills studied up to now are made of sheet metal with a black coating. The main disadvantage of these systems lies in their high corrosion and water contamination by the rust of the metal used and some toxic elements. Two solar stills were designed, constructed and tested in this study in order to compare the efficiencies of the different solar desalination systems. The first one is a glass solar still with sensible heat storage materials and the second one is a conventional solar still. The solar still studied was fabricated from cheap locally available glass and healthy materials. The hourly water and glass temperatures, productivity, and efficiency of the still were measured and evaluated experimentally. Moreover, a comparison between the different materials used as absorbers was carried out as well. From the results, it was observed that the system could produce 5.6 l/m²/day of fresh water; it was also found that metal was the best absorber as it exhibited the highest productivity as compared with the other absorbers. However, the maximum volume produced by the conventional solar still was only 4.88 l/m² per day. The lowest productivity, of about 1.6 l / m² /day, was observed with quicklime. In addition, physical analysis of distillate output shows that the quality of water produced is better.

scholarly journals Using Satellite-Derived Vegetation Products to Evaluate LDAS-Monde over the Euro-Mediterranean Area

2018 ◽  
Vol 10 (8) ◽  
pp. 1199 ◽  
Author(s):  
Delphine Leroux ◽  
Jean-Christophe Calvet ◽  
Simon Munier ◽  
Clément Albergel
Keyword(s):  
Land Surface ◽  
Positive Impact ◽  
Vegetation Type ◽  
Land Surface Model ◽  
Mediterranean Area ◽  
Surface Model ◽  
Area Index ◽  
Land Data Assimilation ◽  
Land Data Assimilation System

Within a global Land Data Assimilation System (LDAS-Monde), satellite-derived Surface Soil Moisture (SSM) and Leaf Area Index (LAI) products are jointly assimilated with a focus on the Euro-Mediterranean region at 0.5∘ resolution between 2007 and 2015 to improve the monitoring quality of land surface variables. These products are assimilated in the CO2 responsive version of ISBA (Interactions between Soil, Biosphere and Atmosphere) land surface model, which is able to represent the vegetation processes including the functional relationship between stomatal aperture and photosynthesis, plant growth and mortality (ISBA-A-gs). This study shows the positive impact on SSM and LAI simulations through assimilating their satellite-derived counterparts into the model. Using independent flux estimates related to vegetation dynamics (evapotranspiration, Sun-Induced Fluorescence (SIF) and Gross Primary Productivity (GPP)), it is also shown that simulated water and CO2 fluxes are improved with the assimilation. These vegetation products tend to have higher root-mean-square deviations in summer when their values are also at their highest, representing 20–35% of their absolute values. Moreover, the connection between SIF and GPP is investigated, showing a linear relationship depending on the vegetation type with correlation coefficient values larger than 0.8, which is further improved by the assimilation.

scholarly journals A Review of Balcony Impacts on the Indoor Environmental Quality of Dwellings

2020 ◽  
Vol 12 (16) ◽  
pp. 6453 ◽  
Author(s):  
Catarina Ribeiro ◽  
Nuno M. M. Ramos ◽  
Inês Flores-Colen
Keyword(s):  
Environmental Quality ◽  
Indoor Air ◽  
Positive Impact ◽  
Climatic Conditions ◽  
Indoor Environmental Quality ◽  
Visual Comfort ◽  
Acoustic Comfort ◽  
The Impact ◽  
Comprehensive Study

Balconies are an ancient architectural archetype that are being increasingly considered in multi-family buildings of high-density cities. This paper aims to provide a comprehensive review of the impacts of balcony types on the indoor environmental quality (IEQ) and energy consumption of dwellings. Of the reviewed studies, 69% were published during the last decade, making it evident that awareness of the positive impact of balcony spaces is continuously increasing. The literature review allowed us to identify three balcony spaces according to their morphology and their boundary system: open balcony (OB), glazed balcony (GB), and eliminate balcony (EB). It was concluded that these balcony types produce relevant impacts in four factors that contribute to the indoor environmental quality: thermal comfort, indoor air quality, visual comfort, and acoustic comfort. Practical design recommendations and constraints were provided according to distinct climatic conditions and building technologies. This review also explored the assessment methodologies used for the optimization of the balconies on the design process. The literature highlighted the lack of a comprehensive study about the impact of balconies in mild and Mediterranean climates, as well as the knowledge limitations concerning the balance between the impacts on IEQ factors.

scholarly journals Assessment of the Agricultural Water Use in Jericho Governorate Using Sefficiency

2020 ◽  
Vol 12 (9) ◽  
pp. 3634
Author(s):  
Nasser Tuqan ◽  
Naim Haie ◽  
Muhammad Tajuri Ahmad
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Positive Impact ◽  
Economic Value ◽  
Climatic Conditions ◽  
Agricultural Water ◽  
Agricultural Water Use ◽  
Yield Production ◽  
Use Efficiency

Addressing water use efficiency in the Middle East is challenging due to the geopolitical complexity, climatic conditions and a variety of managerial issues. Groundwater is the dominant water resource for Palestinians, while aquifers are shared with their neighbours. We assessed in this study the efficiency of the agricultural water use in Jericho, which we defined as the Water Use System (WUS), and its impact on the main source, the Eastern Aquifer Basin (EAB), using the Sustainable Efficiency (Sefficiency) method. The assessment considered the objectives’ difference between the farmers in the region and the water managers. As Sefficiency requires, the analysis also considered in addition to the quantities of the different water path types within our WUS, their quality and beneficial weights. The results highlighted efficiency improvement potentials, a substantial number of unreported abstractions and an impact of the use of chemical substances on the main source. In addition, through hypothesizing four scenarios, we demonstrated that: 1. Improving the quality of returns has a great positive impact. 2. Increasing water abstractions is not beneficial if it is not linked to an increase in yield production. 3. Precipitation rates can influence water use efficiency. 4. More careful treatment of the unwanted plants and a selection of high socio-economic value crops would enhance Sefficiency.

scholarly journals Experimental investigation on heat extraction from a rock bed heat storage system for high temperature applications

2016 ◽  
Vol 27 (2) ◽  
pp. 30 ◽  
Author(s):  
Denis Okello ◽  
Ole J Nydal ◽  
Karidewa Nyeinga ◽  
Eldad J K Banda
Keyword(s):  
Experimental Investigation ◽  
Solar Energy ◽  
Heat Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Cooking Time ◽  
Heat Extraction ◽  
Flow Conditions ◽  
Rock Bed ◽  
Air Speed

Solar energy is available in an intermittent way, and integrating an energy storage system with solar energy collection devices may promote uninterrupted supply of energy in the absence of the availability of solar energy. It has been shown that heat can be stored using rocks packed in a bed, but limited work has been reported on heat extraction from a charged rockbed. This paper reports on the heat extraction from a charged rock bed. Discharging tests were performed under different air flow conditions and initial bed temperatures. Without the blower, the discharging rate is very slow. The discharging rate can be increased, and the cooking time controlled by adjusting the air speed through the rock-bed system.

Sign in / Sign up

Export Citation Format

Share Document