scholarly journals Analysis of a greenhouse thermal performance using dynamic simulations

2019 ◽  
Vol 29 ◽  
pp. 1-15
Author(s):  
Juan Carlos Barragán-Medrano ◽  
Norma Alejandra Rodríguez Muñoz ◽  
Mario Najera-Trejo ◽  
Jorge Alberto Escobedo-Bretado ◽  
Ignacio Ramiro Martin-Domínguez ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Thermal Performance ◽  
Dynamic Simulations ◽  
Heating And Cooling ◽  
Shape Structure ◽  
Different Shapes ◽  
Operative Costs ◽  
Köppen Climate Classification ◽  
Cover Material ◽  
Selection Of

Four different shapes of a 182 m2 research greenhouse were analyzed using dynamic simulations. The thermal performance was evaluated using different cover materials at an equal floor area. In developing countries, the selection of the greenhouse shape, structure, and cover material generally is made based on the availability of the materials and considering the initial investment costs. The greenhouse is located on a cold semi-arid (BSk) climate according to the Köppen climate classification. This study aimed to determine the best choice of the greenhouse shape and cover material according to a technical-economic analysis. The analysis was conducted from a technical-economic perspective for this specific climate region. The results show the heating and cooling energy consumption for different cover materials and greenhouse shapes. The economic analysis was made to assess the investment and operative costs through the life span of the greenhouse.

A building’s thermal assessment using dynamic simulation

2016 ◽  
Vol 27 (2) ◽  
pp. 173-183 ◽  
Author(s):  
Norma A Rodríguez-Muñoz ◽  
Mario Nájera-Trejo ◽  
Olivia Alarcón-Herrera ◽  
Ignacio R Martín-Domínguez
Keyword(s):  
Dynamic Simulation ◽  
Air Conditioning ◽  
Operating Parameter ◽  
Thermal Conditions ◽  
Simulation Software ◽  
Air Cooling ◽  
Dynamic Simulations ◽  
Köppen Climate Classification ◽  
Selection Of ◽  
Storey Building

A thermal analysis of a two-storey building was made using a dynamic simulation software (TRNSYS). Thermal performance of a 2000 m2 building was examined by means of several dynamic simulations. The building is located in a region within the BS climate (steppe) according to the Köppen climate classification, where both air cooling and heating are needed to provide comfortable thermal conditions through the entire year. This weather often represents an energy saving challenge, where heat gains and heat losses need to be efficiently managed. A selection of common construction and glazing materials was implemented, and a simple but effective ventilating strategy was tested. Six thermal zones were defined in the building and a comfort temperature range was established as an operating parameter. The results show hourly mean temperatures and energy consumption due to air conditioning throughout a year.

scholarly journals Numerical Evaluation of a HVAC System Based on a High-Performance Heat Transfer Fluid

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3298
Author(s):  
Gianpiero Colangelo ◽  
Brenda Raho ◽  
Marco Milanese ◽  
Arturo de Risi
Keyword(s):  
Heat Transfer ◽  
High Performance ◽  
Cooling System ◽  
Electrical Energy ◽  
Simulation Software ◽  
Heat Transfer Fluid ◽  
Hvac System ◽  
Dynamic Simulations ◽  
Heating And Cooling ◽  
The University

Nanofluids have great potential to improve the heat transfer properties of liquids, as demonstrated by recent studies. This paper presents a novel idea of utilizing nanofluid. It analyzes the performance of a HVAC (Heating Ventilation Air Conditioning) system using a high-performance heat transfer fluid (water-glycol nanofluid with nanoparticles of Al2O3), in the university campus of Lecce, Italy. The work describes the dynamic model of the building and its heating and cooling system, realized through the simulation software TRNSYS 17. The use of heat transfer fluid inseminated by nanoparticles in a real HVAC system is an innovative application that is difficult to find in the scientific literature so far. This work focuses on comparing the efficiency of the system working with a traditional water-glycol mixture with the same system that uses Al2O3-nanofluid. The results obtained by means of the dynamic simulations have confirmed what theoretically assumed, indicating the working conditions of the HVAC system that lead to lower operating costs and higher COP and EER, guaranteeing the optimal conditions of thermo-hygrometric comfort inside the building. Finally, the results showed that the use of a nanofluid based on water-glycol mixture and alumina increases the efficiency about 10% and at the same time reduces the electrical energy consumption of the HVAC system.

scholarly journals Renewable Heating and Cooling Solutions for Buildings and Industry

Proceedings ◽  
2020 ◽  
Vol 65 (1) ◽  
pp. 16
Author(s):  
Andrea Frazzica ◽  
Régis Decorme ◽  
Marco Calderoni ◽  
Alessandra Cuneo ◽  
Zuzana Taťáková ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Heat Pump ◽  
Solar Thermal ◽  
Renewable Energy Technologies ◽  
Energy Technologies ◽  
Heating And Cooling ◽  
Common Strategy ◽  
Selection Of

This workshop brought together a selection of H2020 EU-funded projects involving experts from the biomass, geothermal, solar thermal, and heat pump sectors to discuss a common strategy for increasing the use of renewable energy technologies for heating and cooling for buildings and industry.

Thermal performance of a radiant wall heating and cooling system with pipes attached to thermally insulating bricks

2021 ◽  
pp. 111122
Author(s):  
Michal Krajčík ◽  
Martin Šimko ◽  
Ondřej Šikula ◽  
Daniel Szabó ◽  
Dušan Petráš
Keyword(s):  
Thermal Performance ◽  
Cooling System ◽  
Heating And Cooling ◽  
Wall Heating

Study on the Ground-Source Heat Pump with Properties of Thermal Dynamics Used in Heating and Air Conditioning by Economic Analysis

2012 ◽  
Vol 252 ◽  
pp. 433-437
Author(s):  
Zhi Yang Yuan
Keyword(s):  
Economic Analysis ◽  
Heat Pump ◽  
Air Conditioning ◽  
Surface Soil ◽  
Ground Source Heat Pump ◽  
Thermal Dynamics ◽  
Air Conditioning System ◽  
Economic Competitiveness ◽  
Heating And Cooling ◽  
Ground Source

The ground-source heat pump is a system which takes the shallow surface soil energy as the source of heating and cooling. The temperature of ground source is relatively stable throughout the year, which makes the ground-source heat pump have the higher operation efficiency compared with the traditional air-conditioning system.Study on the ground-source heat pump with properties of thermal dynamics used in heating and air comditioning by ecomomic analysis is still an important issue. In this paper, the ground-source heat pump and the traditional heating and air-conditioning system have been compared in terms of their economic competitiveness. Firstly, it is required to compare the ground-source heat pump with the traditional heating method in terms of the heating economy. Afterwards, it is necessary to compare the ground-source heat pump with the conventional electric refrigeration in terms of the air-conditioning economy. Finally, it is needed to conduct the comprehensive and economic analysis for the ground-source heat pump and the boilers and air conditioning, which includes four programs.

Dynamic Simulations of Thermal Performance of a Building using Various Construction Scenarios in Morocco

2017 ◽  
Author(s):  
Said Hamdaoui ◽  
Mustapha Mahdaoui ◽  
Rachid El Alaiji ◽  
Amine Allouhi ◽  
Abdelouahad Ait Msaad ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Dynamic Simulations

scholarly journals Penerapan K-Means Clustering Untuk Seleksi Frame Dominan Berbasis NTSC Pada Obyek Bergerak

2020 ◽  
Vol 7 (4) ◽  
pp. 745
Author(s):  
Rizka Indah Armianti ◽  
Achmad Fanany Onnilita Gaffar ◽  
Arief Bramanto Wicaksono Putra
Keyword(s):  
Feature Extraction ◽  
Video Data ◽  
Clustering Method ◽  
Data Frame ◽  
First Order ◽  
Feature Extraction And Selection ◽  
Different Shapes ◽  
Frame Set ◽  
Selection Of

<p class="Abstrak">Obyek dinyatakan bergerak jika terjadi perubahan posisi dimensi disetiap <em>frame</em>. Pergerakan obyek menyebabkan obyek memiliki perbedaan bentuk pola disetiap <em>frame-</em>nya. <em>Frame</em> yang memiliki pola terbaik diantara <em>frame</em> lainnya disebut <em>frame</em> dominan. Penelitian ini bertujuan untuk menyeleksi <em>frame</em> dominan dari rangkaian <em>frame</em> dengan menerapkan metode K-means <em>clustering</em> untuk memperoleh <em>centroid</em> dominan (<em>centroid</em> dengan nilai tertinggi) yang digunakan sebagai dasar seleksi <em>frame</em> dominan. Dalam menyeleksi <em>frame</em> dominan terdapat 4 tahapan utama yaitu akuisisi data, penetapan pola obyek, ekstrasi ciri dan seleksi. Data yang digunakan berupa data video yang kemudian dilakukan proses penetapan pola obyek menggunakan operasi pengolahan citra digital, dengan hasil proses berupa pola obyek RGB yang kemudian dilakukan ekstraksi ciri berbasis NTSC dengan menggunakan metode statistik orde pertama yaitu <em>Mean</em>. Data hasil ekstraksi ciri berjumlah 93 data <em>frame</em> yang selanjutnya dikelompokkan menjadi 3 <em>cluster</em> menggunakan metode K-Means. Dari hasil <em>clustering</em>, <em>centroid</em> dominan terletak pada <em>cluster</em> 3 dengan nilai <em>centroid</em> 0.0177 dan terdiri dari 41 data <em>frame</em>. Selanjutnya diukur jarak kedekatan seluruh data <em>cluster</em> 3 terhadap <em>centroid</em>, data yang memiliki jarak terdekat dengan <em>centroid</em> itulah <em>frame</em> dominan. Hasil seleksi <em>frame</em> dominan ditunjukkan pada jarak antar <em>centroid</em> dengan anggota <em>cluster</em>, dimana dari seluruh 41 data frame tiga jarak terbaik diperoleh adalah 0.0008 dan dua jarak bernilai  0.0010 yang dimiliki oleh <em>frame</em> ke-59, ke-36 dan ke-35.</p><p class="Abstrak"> </p><p class="Abstrak"><em><strong>Abstract</strong></em></p><p class="Abstract"><em>The object is declared moving if there is a change in the position of the dimensions in each frame. The movement of an object causes the object to have different shapes in each frame. The frame that has the best pattern among other frames is called the dominant frame. This study aims to select the dominant frame from the frame set by applying the K-means clustering method to obtain the dominant centroid (the highest value centroid) which is used as the basis for the selection of dominant frames. In selecting dominant frames, there are 4 main stages, namely data acquisition, determination of object patterns, feature extraction and selection. The data used in the form of video data which is then carried out the process of determining the pattern of objects using digital image processing operations, with the results of the process in the form of an RGB object pattern which is then performed NTSC-based feature extraction using the first-order statistical method, Mean. The data from feature extraction are 93 data frames which are then grouped into 3 clusters using the K-Means method. From the results of clustering, the dominant centroid is located in cluster 3 with a centroid value of 0.0177 and consists of 41 data frames. Furthermore, the proximity of all data cluster 3 to the centroid is measured, the data having the closest distance to the centroid is the dominant frame. The results of dominant frame selection are shown in the distance between centroids and cluster members, where from all 41 data frames the three best distances obtained are 0.0008, 0.0010, and 0.0010 owned by 59th, 36th and 35th frames.</em></p><p class="Abstrak"><em><strong><br /></strong></em></p><p> </p>

scholarly journals Agua, economía y territorio: nuevos enfoques de la Directiva Marco del Agua para la gestión del recurso

2020 ◽  
Vol 29 (1) ◽  
pp. 65
Author(s):  
José A. Gómez-Limón ◽  
Julia Martin-Ortega
Keyword(s):  
Economic Analysis ◽  
Economic Activities ◽  
Public Authorities ◽  
Management Plans ◽  
Water Management Plans ◽  
Development Processes ◽  
Economic Good ◽  
Effective Use ◽  
Water Uses ◽  
Selection Of

Water is a natural resource that performs different functions in development processes (satisfaction of population’s basic needs, key element for ecosystems and landscapes, input in different economic activities, etc.). Taking into account this relevance and its features as an economic good, public authorities have carried out an important role as regulators. The last milestone in this path has been the approval of the Water Framework Directive. One of the most innovative points of this European rule is the use of economic analysis for the optimisation of different water uses. However, the development of the works done for the design of the new water management plans has shown several shortcomings regarding the economic analysis of water uses, the analysis of costs recovery for water services and the selection of meassures to reach these objectives. In this sense it is necessary to strength the nexus between the policy- making and academic spheres in order to support a more rigorous and effective use of the large scientific knowledge developed in this field.

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