1,720,965 research outputs found
Analysis and optimization of PCM enhanced storage tanks for Solar Domestic Hot Water systems
Full text linkA storage device is a fundamental component to enhance the efficiency of the Solar Domestic Hot Water plants. The efficiency of the storage tanks has been investigated through simulation and optimization tools. A PCM model has been implemented in ESP-r and a new plant component has been inserted in the software database. For the type of components/plants analyzed, the improvement provided by the PCM insertion is not dramati
Multi-criteria energy and daylighting optimization for an office with fixed and moveable shading devices
Full text linkThis paper presents an optimization approach to design an external fixed shading device protecting an energy efficient office from high sun loads. The developed methodology takes into account heating, cooling and energy required for lighting appliances, along with the interaction with an internal moveable venetian blind for direct sunlight protection. The optimization process considers whole-year simulations performed with different software codes, specifically ESP-r for energy calculation and DAYSIM® for daylighting analysis, while the modeFRONTIER® tool synchronizes the simulations and drives the optimization for searching optimal solutions. The fixed shading device is a flat panel positioned parallel to the window and inclined by its horizontal axis and the optimization variables change the size, inclination and position of the device with respect to the building façade. Two exposures are considered, south and south-west, and the optimized results are reported as a Pareto front highlighting the performance of different solutions, comparing the energy and daylighting performance of the offic
DEVELOPMENT OF A STRATIFIED TANK STORAGE COMPONENT FOR ESP-R WITH EMBEDDED PHASE CHANGE MATERIAL MODULES
No full textSolar domestic hot water systems (SDHW) are very common and are considered an efficient system for exploiting the renewable energy source of the sun, for instance national Italian regulations require the adoption of SDHW systems in new buildings. Water tanks are typical components for such systems, but have a serious drawback since they require a great amount of space in buildings.
In this paper a new water tank model with embedded Phase Change Materials (PCM) modules for the ESP-r code is presented in order to assess the possibility of using reduced size water tanks with additional latent storage.
The paper describes the numerical model used to deal with phase change phenomena and the incorporation of the method into ESP-r source code. To validate the model the results of a test case have been compared with literature data. A typical SDHW system has been simulated in order to study the impact of the PCM modules inside tanks on the energy performance of the system. The results are reported using a global parameter that represents the fractional primary energy saved by using the solar system. Water temperature plots with and without PCM have been reported as well
L'Ottimizzazione per il Risparmio Energetico negli Edifici
No full textPer raggiungere gli elevati standard richiesti i progettisti possono avvalersi di nuovi strumenti presenti sul mercato. Tra questi assume sempre maggiore importanza la simulazione dinamica del sistema edificio-impianto. Diversi sono i software disponibili, sia commerciali che open-source, che consentono un'accurata analisi delle prestazioni sia degli involucri edilizi sia dell'interazione di questo con sistemi impiantistici sempre più complessi. Il vantaggio rispetto al tradizionale calcolo semistazionario su base mensile o stagionale, è quello di poter effettuare analisi orarie o suborarie che consentono di prevedere compiutamente la dinamica dell'edificio, naturalmente a spese di un tempo di calcolo maggiore e soprattutto di un impegno ed una competenza richiesta decisamente maggior
Energy, daylighting and glare interaction for an office with fixed and moveable shading devices,
No full textThis paper presents an optimization approach to design of an external fixed shading device protecting
an energy efficient office from high sun loads. The developed methodology takes into account heating,
cooling and energy required for lighting appliances, along with the interaction with an internal moveable
venetian blind for glare protection. The optimization process considers whole year simulations performed
with different software codes, specifically ESP-r for energy calculation and DAYSIM® for daylighting
analysis, while the modeFRONTIER® tool synchronizes the simulations and drives the optimization for
searching optimal solutions. The fixed shading device is a flat panel positioned parallel to the window and
inclined by its horizontal axis and the optimization variables change the size, inclination and position of
the device respect the building façade. Two exposures are considered south and south-west, the optimized
results are reported as a Pareto front highlighting the performance of different solutions, comparing the
energy and daylighting performance of the office
Genetic Optimization of a PCM Enhanced Storage Tank for Dolar Domestic Hot Water Systems
No full textIn this paper Phase Change Materials (PCM)
have been studied in order to provide guidelines
to increase the efficiency of a tank storage
system typically used in Solar Domestic Hot
Water (SDHW) plants. The work stems from
some literature results about the use of PCM in
storage tanks which highlight the scarce impact
of this technology on the overall system.
Some related studies suggest that the
introduction of PCM modules into a storage tank
may be convenient only if the system is
optimized in order to exploit the energy storage
capabilities of the material. In this process
should be taken into account different
parameters such as the complexity of the
system, the PCM characteristics and the
interaction with the climatic conditions.
In this work a PCM improved storage tank,
inserted into a typical Solar Domestic Hot Water
(SDHW) system, has been optimized using
mono and multiobjective genetic algorithms. The
optimization has been carried with the
modeFRONTIER optimization tool, while the
system plant has been analysed by means of a
modified version of the building energy
simulation code ESP-r.
In parallel with the optimization a sensitivity
analysis has been carried on in order to find out
the relation between the design parameters of
the tank (geometry, temperature of the PCM and
user behaviour) and the performance of the
system.
Thanks to the multiobjective optimization of the
system different solutions have been presented
with different rankings of the optimized
variables
Development of a Tank Storage Component for esp-r with Embedded PCM Modules
No full textSolar domestic hot water systems (SDHW) are very common and are considered an efficient system for exploiting the renewable energy source of the sun, for instance national Italian regulations require the adoption of SDHW systems in new buildings. Water tanks are typical components for such systems, but have a serious drawback since they require a great amount of space in the building.
In this paper a new water tank model for the ESP-r code is presented. Two new features have been added to an existent model: multiple coil heaters and the possibility to include Phase Change Materials (PCM) modules.
The paper describes the numerical model used to deal with phase change phenomena and the incorporation of the method into the ESP-r source code. The inputs and parameters required to describe the new component are presented as well.
To validate the model the results of a test case have been compared with literature data. A typical SDHW system has been simulated in order to study the impact of the PCM modules inside a tank on the energy performance of the system
Development of a Stratified Tank Storage Component for Esp-R with Embedded PCM Modules
No full textSolar domestic hot water systems (SDHW) are very common and are considered an efficient system for exploiting the renewable energy source of the sun, for instance national Italian regulations require the adoption of SDHW systems in new buildings. Water tanks are typical components for such systems, but have a serious drawback since they require a great amount of space in the building.
In this paper a new water tank model for the ESP-r code is presented. A new feature has been added to an existent tank model, that is the possibility to include internal Phase Change Materials (PCM) modules.
The paper describes the numerical model used to deal with phase change phenomena and the incorporation of the method into the ESP-r source code. The inputs and parameters required to describe the new component are presented as well.
To validate the model the results of a test case have been compared with literature data. A typical SDHW system has been simulated in order to study the impact of the PCM modules inside a tank on the energy performance of the system. Two tank sizes have been used to verify the impact of the modules. The results are reported using a global parameter that represents the fractional primary energy saved by using the solar system. Temperature plots with and without PCM have been reported as well
ENERGY AND DAYLIGHTING OPTIMIZATION FOR AN OFFICE WITH FIXED AND MOVEABLE SHADING DEVICES
No full textIn this paper external fixed shading device geometry is optimized in order to reduce the overall energy consumption in an office room provided with an extensive glazing and moveable Venetian blinds. The fixed shading device is a flat panel positioned parallel to the window and inclined by its horizontal axis. The energy consumption takes into account the energy required for maintaining internal conditions considering heating, cooling and electricity absorbed for artificial lighting. A multiphysic approach applying different simulation codes has been implemented along with RSM and genetic optimization algorithms
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