The underlying research is a joint effort between Cairo University and the Technical University of Berlin to develop technologies and strategies for sustainable pesticide-free agriculture using saline or brackish water. A conventional greenhouse is connected with vertical, glass-covered air tubes functioning as a solar chimney. This can be done as a common method either on open fields or in open greenhouses. The decentralization of heat and water supply opens the possibility of residential areas where greenhouses fed with low quality water grey water and brackish water could be used to produce distilled water as well as heat and fruits. The goal for the development of the "Watergy" technology described in this paper is to provide an economical absorption system for both competitive solar seasonal heat accumulation and for solar cooling, with consideration also for water efficiency. There is a fan that blows air out of the greenhouse. A specific problematic wastewater in coastal areas is coming from the fish industry, as it increases the total salinity of urban wastewater, thus making it problematic for reuse in irrigation. Finally, the dimensioning of the system model determines the required land areas for sustainable supply and shows that the system configuration has features of a carbon-absorbing city and thus exceeds the concept of a zero-emission city.
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Within this essentially closed system, greenhouse plants and fermentation micro organisms supply each other with oxygen and carbon dioxide.
Watergy project: Towards a rational use of water in greenhouse agriculture and sustainable architecture Artikel. In the feedback duct, air is strongly cooled by a large heat exchanger, causing it to fall.
It can be condensed and stored under normal pressure. The drainage from these filters can be used for irrigation water supply of the new generation greenhouses.
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|Saline water can be used in the greenhouses for evaporative cooling in a way, that also the condensed water yield is increased. International Society for Horticultural Science, 45 The heat accumulator stores chilled water to run the cooling function the following day.
In SSFon the other hand, low cost materials like wood-chips, reed-straw or agricultural by-products can be processed.
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Due to the low-temperature characteristics of the relevant systems and services, detailed simulations are required to approve the functioning and viability of the new technology. Finally, a simple air to air heat exchanger can be placed at the upper outlet of the greenhouse system to cool down the hot and humid air and to force condensation. Using this approach, the agricultural control mechanisms for growing and processing regenerative raw materials could be radically changed.
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The project contemplates the development of two prototypes: one application for arid climates in Southern Europe with an emphasis on water production in the context of greenhouse horticulture, and another for temperate Central European climate focused on heat and water production for sustainable architecture.
In a second compartment along a mountain slope, the growing air temperatures can be used to evporate more seawater from ponds, that can be placed within several terraces.
Geyer, Philipp; Buchholz, Martin Parametric systems modeling for sustainable energy and resource flows in buildings and their urban environment Artikel Automation in Construction, 22S. Experiences in cultivation inside the watergy prototype of a closed greenhouse for semi-arid regions Konferenz. It is an open system with a linear air flow.
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|The decentralization of heat and water supply opens the possibility of residential areas where greenhouses fed with low quality water grey water and brackish water could be used to produce distilled water as well as heat and fruits.
Insufficient waste water treatment is also the base for groundwater contamination and related problems with diseases.
Absorption systems are also considered a base technology for solar cooling applications. The main energy source for greenhouse heating is the composting of organic waste in the fermen tation unit.
Strikewith a similar crop grown simultaneously in an open greenhouse. Several lab scale experiments and a m2 prototype were built in Egypt to optimize the process and answer research questions.