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Contenido archivado el 2022-12-27

ENVIRONMENTAL CONTROL FOR GREENHOUSES EQUIPPED WITH A SHORT TERM ROCK BED THERMAL STORAGE

Objetivo

Aim :
- Recuperation of solar energy.
- Reduction of the air infiltration rate
- Prevention of overheating and air-stratification.
- Deshumidification in pebble bed.
- Optimization and implementation of an optimal control strategy.
From the installed project and the following measurements, following conclusions can be taken :
* the surface of the collector unit can be enlarged up to +/- 400 m2.
* the rock bed can be reduced with 50% but by holding about the same passing section.
* the debit of the ventilator can stay unchanged, but may possible be executed with 1 speed.
With this basis, a new study can be made with following characteristics :
* The construction based on a standard 12,80 m greenhouse with a surface of 413 m2
dimensions : 12.80 m wide x 32.30 m long
gutter height : 4.20 m
* The greenhouse will be equipped with benches, type rolling benches. Two benches will be fixed and under these benches we'll put the rock bed.
* The rock bed has a section of about 2 m wide and 1 m high and will be digged in for 40 cm. The bed has a U-form with leg length of 6 m and an air chamber in front of the two legs.
The total stone contents is 25.2 m3 porphyry.
* The debit of air will become 4500 m3/hour.
* The sun collectors are perforated air channels diameter 3500 mm, painted in black.
* The ventilation group will be equipped with a heating battery as volume heating if there was no suffisant storage.
* The benches will be equipped with a low temperature heating circuit at the bottom of the benches.
The proposed execution has following advantages :
* The rock bed will be placed for the largest part upper ground, by this means it isn't necessary to make an expensive watertight cellar.
An execution with insulated sandwich pannels, or a space in masonry (executed by the customer) is sufficient. This gives a real advantage about the price level.
* The air group will be placed under the benches. By this way there will be no shadow.
* The incorporated heating battery allows to work without the traditionally heating tubes, so that the collector tubes don't cause "supplementary" shadow in the greenhouse.
A ware-house operating at a setpoint of 12 deg. C will be constructed, equipped with a short term thermal rock-bed storage. Black painted airconditioning ducts are placed in the ridges of the ware-house above the thermal screens. Those low cost air collectors operate together with the thermal screens, and with the ventilation control. Four storage units are placed in the soil of the greenhouse. The air system is a closed loop system using only inside air. When the operation mode changes (charge - discharge) there is flow inversion in the storage. Part of the classical (water) heating system is replaced by an air heating system.
Floor area : 1120 m2 volume : 3349 m3
Collector area : 126 m2 storage : 192 m3 (4 units)
2 fans : max. 2 x 7000 m3/h at 2 x 900 Pa (2 x 2000 Watt)
min. 2 X 3500 m3/h at 2 x 240 Pa (2 x 275 Watt)
heat loss coefficient : 9337 W/deg. C heat injection potential HRS = 50000 Watt maximum heat removal potential HRS : 62000 Watt
Air collectors operate (storage) when external horizontal radiation succeeds 225 W /m2.
The air collectors involve an extra air-temperature increase which fully compensates the exploitation cost electrical consumption of the fans).
The heat demand is 30 : lower than in a convetional system.
The heating cost is 40 : lower than in a conventional system.
The operation hours are 28 : lower than in a conventional system.

Ámbito científico (EuroSciVoc)

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Coordinador

SERRES DEFORCHE NV
Aportación de la UE
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Dirección
GENTSEHEERWEG 108
8700 IZEGEM
Bélgica

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