The mechanical way of pollination of the flowers.

Motivation:
All over the world, harmful insects are combated with pesticide poisons, with beneficial insects, with traps and with the denial of their entry inside greenhouses with insect-proof nets. All over the world pollination is implemented with hormones and bumblebees. Results of these methods are extensive costs and serious side effects.

Aim of the proposed project:
A mechanical application for cleaning greenhouses and a combined mechanical application for pollinating flowers.
Expansion of the basic idea:
The proposed project aims at the development of a vehicle that will roam autonomously using a liquid-gas powered generator inside the greenhouse, with the assistance of sensors and utilizing a map of the greenhouse it will follow every night. During its movement: 1) the forward part of the vehicle will blow with an appropriately strong air current each plant from the roots to its top, with the result of forcing insects to flight and thee pollen to float and 2) at the back of the vehicle a suitable light concentrates the insects which with the assistance of a suction vent, traps and stores insects in water container.

During his movement:
1) From its front, it blows with a suitably strong air stream every plant from the root to the top, causing the insects to fly and at the same time the pollen is suspended and
2) At the rear of the vehicle a suitable light gathers the insects, which, with the help of an absorber, sucks them and stores them in a bucket of water.

Geothermal Greenhouse

  • The system has been introduced to the Greek market by the company since 1981
  • Significant experience in specialties and construction philosophy
  • The principle of operation is based on spraying water between the two plastic covers
  • The creation of 5 insulation layers of cover in extreme weather conditions helps to maintain proper conditions inside the greenhouse (7 ° C indoor temperature)
(Σχέδια της εταιρείας από το 1981)

What has changed since 1981 to date?

The research developed by the company, combined with the improvement of building materials, has led to an improved greenhouse issue. The parameters constituting the greenhouse disadvantages have been improved or eliminated:

1. Increased shading conditions due to double skeleton and double plastic

2.The ventilation issues

3.High Construction Cost

Βελτιωμένη έκδοση του θερμοκηπίου που δοκιμάστηκε στο ΑΠΘ

Απουσία 2ου σκελετού
Δυνατότητα αερισμού με πλαϊνά ανοίγματα

Improved plastic compared to 3 decades ago – permeability was about 65% and now reaches 90%

Schematic form of today’s version of the geothermal greenhouse without the presence of the 2nd skeleton

 

Temperature setting in double cover:

  • Inner plastic cover
  • Water film layer
  • The air layer
  • Ice layer
  • External plastic cover

They prevent the heat from escaping, acting as an insulator and an obstacle in the outgoing without artificial heating radiation

Trapping of the thermal radiation when the temperature is particularly low due to the strong contribution of the ice layer – as the cold increases, the ice thickness increases, keeping the temperature indoors up to 7oC for external -20oC

Saving compared to typical greenhouse construction of 80%

Construction details

Τρόπος φουσκώματος πλαστικών
Γραμμή μπεκ στον κορφιά
Αεραντλία για φούσκωμα των πλαστικών

Pictures of the system in operation

Ice formation

General description of the system

The proposed system aims at covering a multitude of greenhouse needs, both during the wintertime and the summertime. The goal is to maintain the most optimal possible conditions inside a greenhouse, so as to maximize production and to extent the farming season. The system requires the construction of a chamber that is an extension of the greenhouse, as seen in Figure 1. The basic construction elements of the chamber are:

A)The basic frame

B)External window with wet panel

C)Internal window between the chamber and the greenhouse

D)Dehumidification surface

The dynamic – functional elements of the system are mentioned separately in every function bellow.

Functions

  1. The system functions examined are:
    1. Ventilation in combination with the already existing roof openings
    2. Cooling with the assistance of the wet panel system and forced circulation
    3. Dehumidification of the greenhouse air through water vapor condensation
      Heating by hot air distribution in the area as a supplementary mode

Cooling function

Cooling is achieved with the help of forced air circulation through the fans and the activation of the wet panel system with the opening of the outer window, as exhibited in Figure 3..

Dehumidification function

The climate formation functions (heating, cooling, and ventilation) and also the crop itself (plant transpiration phenomenon and vaporization) can lead to relevant humidity rise in the greenhouse. With a simple construction, an array of pipes mounted on a steel plate and through which pipes water is circulated from outdoors water tanks, the condensation of water vapor on the pipes’ exterior is possible. In Figure 4, this operation is summarily shown.

Heating function

The construction of the extra chamber and the mentioned equipment (fans, perforated air duct, etc.) enables the inexpensive forming of a heating system that can function complementary to the already existing system. The depiction of the operating principle is shown in Figure 5.

Comparison of greenhouse temperatures