Projekte

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Development of low cost renewable cooling and heating systems for Egyptian buildings <<

Akronym NightCool
Funding Bundesministeriums für Bildung und Forschung (BMBF)
Request for Proposal Dritte Gemeinsame Bekanntmachung des Bundesministeriums für Bildung und Forschung der Bundesrepublik Deutschland und des Science and Technology Development Funds der Arabischen Republik Ägypten
Supporting Organisation DLR
HFT project director Prof. Dr. habil. Ursula Eicker
Project Staff Dr. Irina Mitina
Project partners German University in Cairo (GUC)
Duration 01.01.2015 - 31.12.2016
Project description The electrical energy demand for space cooling and thus the number of air condition split-systems in Egypt is continually increasing. In peak hours it leads sometimes to cut-offs of electricity.This project contributes to the development of low cost renewable energy supply system for heating, cooling and domestic hot water for egyptian buildings. The operating principle of the suggested energy supply system is based on the radiative cooling that take place mainly at night. The thermal fluid that circulates through an uncovered solar collector is cooled down through the long-wave heat loss towards the sky and convective heat loss. This cooled fluid can then conditionate the room air either directly or it can be stored in a tank and then used for the cooling during the day. The egyptian dry climate favours the long-wave radiation heat transfer from the solar collector towards the sky, because the sky is usually clear at night. Various uncovered and uninsulated solar collectors will be investigated in terms of their energy performance and building integration feasibility. The cooling and heating potential of the proposed system will be assessed under the Egyptian climate conditions experimentally and with help of simulations. To do this, a test rig with solar collector available on the market will be built and tested in cooling and heating mode. The project results will be transfered to agyptian students, practitioners from universities and manufacture companies during a practice-oriented workshop.
Keywords Solar Thermal, Radiative Cooling, Passiv Cooling, Low-cost technology