Adrian-Gabriel Ghiaus

Technical University of Civil Engineering of Bucharest · Termotehnica

The solar air heater (SAH) is the main component of solar dryers that supplies hot air to the drying chamber. Therefore, its optimization is necessary to improve the efficiency of solar dryers. In the present study, a SAH was equipped with a heat storage unit made of PCM block and then analyzed under real meteorological conditions in Eastern Morocc...

This paper presents the influence of the thermal bridges effect on heating demand in residential buildings using numerical simulation. Quantitative evaluation on temperature field is performed by means of linear heat transfer coefficient. Specific details of existing thermal bridges within the building envelope have been identified and selected for...

Highly viscous fluids (HVF) are used in food sector as raw materials (melted vegetable, animal fats) or finished products (chocolate, sorbets), in construction sector as liquid state of Phase Change Materials (PCM) used to store thermal energy inside building structure or building materials such as liquid concrete, bitumen and tar, in automotive in...

For seedlings production, healing and acclimatization are the most important processes in obtaining healthy and vigorous plants. Influence of photosynthetic photon flux density (PPFD) on a healing tunnel environmental parameters was investigated. The experiments were carried out at HORTING institute’s micro-production greenhouse using 9 alveolar tr...

The present work was focused on the experimental investigation of a double air pass solar collector which was designed and constructed at the Laboratory of Energetic and Thermal Applied of the National School of Agro-Industrial Sciences of the University of Ngaoundere. It consists of a double glazed cover with a surface of 0.47 m², an absorbent pla...

Buildings represent a large part in terms of fossil energy consumption, which depends on the great need for heating. Even if the solar absorption heat storage system is possible, the performance of this system is affected by the cycle limits and the climatic conditions. The goal of the present study is to control the thermal performance of the syst...

This paper presents the analysis of airflow distribution in an open space room by means of CFD numerical simulation having as case study a pre-certified passive house, located in Cluj-Napoca. The ventilation system comprises two rectangular inlets, located on the floor near the glazing and six exhaust grilles of circular cross section located at th...

In the civil and industrial construction engineering, the comfort of occupants is ensured by achieving appropriate microclimate conditions. The human physical comfort (thermal, visual, acoustic) is achieved when the person from an enclosure is in a state of equilibrium and is able to perform tasks with maximum possible efficiency and without any ki...

This paper presents the analysis of local air currents distribution near the inlet and outlet openings in a living room of study a pre-certified passive house located in Cluj-Napoca by CFD numerical simulation. The simulation domain is represented by an open space concept, comprising the living room and the kitchen, situated at the ground floor of...

Design optimization and evaluation of existing solar dryers can be done through numerical simulation of the complex and coupled transfer processes taking place inside drying units. Analysis of moisture concentration and relative humidity evolution of the drying air along with pressure, velocity and temperature profiles was done both inside the sola...

Solar tray drying is an effective alternative for post-harvest processing of fruits and vegetables. Product quality and uniformity of the desired final moisture content are affected by the uneven air flow and temperature distribution inside the drying chamber. The purpose of this study is to numerically evaluate the operation parameters of a new in...

The present study reports on the analysis and optimization of ventilation system inside drying kiln unit. Three-dimensional numerical solution of air flow within the drying kiln enclosure contributes to the improvement of the final product quality. The air flow field is examined in different configurations and operation conditions. Depending on the...

The paper presents technical considerations for design and construction of the experimental model for an automatic microwave drying system for construction materials. The main requests of the drying process lead to the system structure automatic control of a microwave dryer for which the aspects concerning automatic control of microwave drying proc...

Water is one of the most used liquids in industry because of its availability, negligible toxicity and chemical ability to solve almost any substance. Water is also the most common liquid that can be found in and around industrial facilities. Often it is polluted with chemical elements and is not allowed to discharge it into the environment. In fac...