Objective
The aim of the project is the production of quality hay in specially designed storage halls with a solar roof on four sites with different climatic conditions without the use of conventional fuel, except electricity for the blower.
In two of the four plants the first monitoring results were achieved in 1986.
SCHUSTER
The hay was dried to 8% instead of 14% thus the electrical consumption of 15,8 kWh/ (+ dried material) was higher than calculated.
KEBINGER
A particular interesting result was found during the first monitoring period : while increasing the air flow on a sunny day through the ducts under the roof, the air temperature did rise instead of fall, which means that the heat exchanging efficiency is rising more than proportional with the air flow. More investigations will follow.
The standard hall with compartments has a ground surface of 240 m2 with a usefull storage volume of 937 m3. The conventional roof of red concrete tiles with the supporting structure built as air channels is acting as solar collector (280 m2). The warm air (6 - 7 deg. C. above inlet temperature) is blown via a collecting duct to the channels on the floor of the drying and storage compartments with a total hay capacity of approximately 900 m3. The humidity of the hay is reduced from approximately 40% to 14%.
During the harvesting period of approximately 60 days an energy saving
of 29,300 KWh compared to a conventional system (Diesel engine driven blower with use of waste heat and auxiliary heating for drying) is forecasted. This figure is based on measurements on a pilot plant. The total energy saving for four standard halls is estimated at 10 TOE, taking into account the electricity consumption of the blower (7,5 - 9 KW; 4,000 KWh/y) and an efficiency of 70% for the conventional system.
The standardised storage and drying halls are installed at four different sites.
1. Schuster, Frettenhofen
2. Kebinger, Lehen
3. Rieder, Schoenau
4. Lehr und Versuchungsgut, Schleissheim
The first three are farmers the last is an agricultural institution of the Technical University Munich. The hall in Schleissheim has the double capacity of the other ones, achieved by adding more compartments.
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Programme(s)
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Coordinator
8050 Freising
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.