Marderos Ara Sayegh

• Wrocław University of Science and Technology

Share Link: https://authors.elsevier.com/c/1gdHM1HudNBqAs The possibility of unfavorable leakages, especially with infectious diseases, in heat recovery systems in airhandling units (AHU) is an essential issue. Typical configurations of AHU are analyzed in this aspect, based ontheir pressure distribution. It is shown that analyzing only for the de...

A hybrid air conditioning system, which is composed of a novel gravity-assisted heat pipe (GAHP)-based indirect evaporative cooler (IEC) and direct expansion (DX) cooling coil, is proposed and investigated here. After developing a mathematical model to describe the performance of the GAHP-based IEC, the hybrid system is evaluated during the cooling...

Swimming pools are used around the world for recreational, rehabilitation and physical activity. From an energy and environmental standpoint, grey water as a waste thermal potential of swimming pools is a valuable heat source produced continuously in extensive, measurable and large quantities. The main objective of this article is to analyse the fe...

Reducing energy consumption, increasing energy efficiency technologies and solutions, decreasing emissions are very effective tools towards EU environmental policy. The constant demand for domestic hot water (DHW) throughout the year creates great benefits for drain water heat recovery (DWHR) systems in hotels, which is the most promising and signi...

The paper examines the variability of long-wave radiation fluxes in two contrasting types of urban active surfaces – grassy surface and surface without plants (bare soil) in Wrocław (Poland) within a 12-year period (August 2007–July 2019). The study used net radiation and heat balance formulas to calculate the share of individual radiation fluxes i...

Gas preheating is a key process to prevent the formation of hydrates in gas stations. In order to ensure safe operation of nearly 900 pressure reduction stations in Poland, it is necessary to provide a significant amount of energy, estimated up to 700 TJ per year. Gas can be preheated by means of gas and electrical technologies, both of which have...

Modular composite walls are widely used in many industrial applications such as thermal applications, different kinds of heat exchangers ... etc. These structures allow to rapidly and economically divide spaces and to create separate areas. Different size and shape of a wall can be combined and connected to build permanent or temporary walls that m...

The purpose of this book is to investigate the integration potential of heat pumps into district heating (DH) networks and of the measures to remove barriers hindering their widespread implementation, to assess developed technologies and solutions, policies and trends and, to discuss the environmental consequences resulting therefrom especially for...

Currently there is increasing interest in using surface water bodies as renewable energy sources for year around or seasonal heating and cooling applications e.g. heat pumps. This paper presents the statistical analysis of average water temperature and the flow rate of the Oder River. Linear regression analysis was carried out on the base of ten ye...

The use of heat pumps in district heating is one of the most promising technologies for enhancing the efficiency of systems and for meeting the 2030 and 2050 European energy and climate targets. It is essential to assess the available data, the practice and experience of planners and engineers to determine heat pump placement, connection and operat...

Municipal solid waste (MSW) collection and disposal is one of the major problems of urban environment in most countries worldwide today. The problem of utilization of solid waste in the Northern Europe on the Kola Peninsula was raised in this article, where the ground arrangement in a subarctic zone is very special and the weather conditions are se...

Achieving thermal systems and processes which are energy efficient and of optimised design is a goal for researchers and engineers in view of rising energy costs and decreasing targets for greenhouse gas emissions. Energy efficiency is also vital if organisations are to remain competitive. Consequently, great effort is being expended on enhancing b...

The use of heat pumps in district heating is one of the most promising technologies for enhancing the efficiency of systems and for meeting the 2030 and 2050 European energy and climate targets. It is essential to assess the available data, the practice and experience of planners and engineers to determine heat pump placement, connection and operat...

В ведение. Общественный сектор производства электроэнергии и тепла ЕС (PEAHP) в основном основан на традиционном сжигании топлива и отвечает за 30% ежегодной эмиссии CO2. PEAHP играет важную роль в достижении будущего низкоуглеродного угля в ЕС. Материалы и методы. Данные о выбросах CO2 и потреблении энергии в течение двух десятилетий в ЕС были про...

There is a considerable diversity of district heating (DH) technologies, components and interaction in EU countries. The trends and developments of DH are investigated in this paper. Research of four areas related to DH systems and their interaction with: fossil fuels, renewable energy (RE) sources, energy efficiency of the systems and the impact o...

The orthotropic materials are of a great importance and interest in fields of the modern industrial technologies applications due to their hardness, their lightness and their super elasticity. During their operation period and under the effect of an external effort, these materials can be submitted to cracks or ruptures which can cause the disaster...

In recent years, the use of wickless heat pipes (thermosyphons) in heat exchangers has been on the rise, particularly in gas to gas heat recovery applications due to their reliability and the level of contingency they offer compared to conventional heat exchangers. Recent technological advances in the manufacturing processes and production of gravi...

The objective of this research is evaluating and comparing two methods of improving dehumidification in air conditioning systems. The two methods are the hybrid system: (refrigeration cycle – rotary desiccant) and the heat exchanger cycle. The impact of the desiccant performance on the hybrid system performance was studied. The impact of the heat e...

In recent years building integration of solar thermal with PV modules has become more and more popular in different countries, where national support programs have accelerated the dissemination of grid connected PV systems. The installation of a (BIPV) systems have certain advantages compared to a traditional PV or thermal system mounted in a separ...

The synchronizing of cooling loads with solar radiation intensity is an important advantage when we utilize solar energy in cooling or air conditioning in residential buildings. Practical experience confirms that appropriate design of these systems can achieve good results to use solar energy in air conditioning projects if they compared with conve...