Smart systems to create the optimal climatic conditions
for your crops.
We offer a variety of systems that efficiently and accurately create the ideal climatic conditions for your crops.
For many greenhouse projects, cooling is an essential requirement as a greenhouse by its very nature creates and stores heat. A variety of cooling methods can be implemented that provide a ‘best of both worlds’ scenario for the grower.
- The simplest, and most cost effective technique is by means of air exchange between the air inside the greenhouse and the atmosphere outside. This exchange is accomplished either passively through roof and side vents, or actively by operating ventilators that increase the rate of air exchange when natural air exchange is insufficient for the plant’s requirements.
Another cooling process, which increases the humidity while lowering the temperature inside the greenhouse, is adiabatic cooling. Vegtech supplies two cooling systems based on this principle.
- High-pressure fogging systems create a super-fine fog that can reduce the ambient temperature by 5-10°C. They deliver an ultra-small droplet size of as little as 10 microns at high pressure that is ideal for rooting and does not wet crop leaves.
- Pad & fan cooling systems are highly effective, and ideal for hot and dry conditions. Ventilation is forced by extracting hot air out of the greenhouse and cooling the air entering the greenhouse. These pad & fan systems make use of Munters innovative CELdek® evaporative cooling pads, that are engineered to provide maximum cooling, low pressure drop and years of reliable service.
Vegtech provides a choice of two heating options that provide uniform heat dispersal, and accurately and efficiently control temperature and humidity.
- Hot Water Method:
This heating method is partly based on direct radiation, in which parts of the plant receive direct radiation from the heating pipes. The water temperature is normally controlled by three 4-way valves, which control the ratios of hot and cold water. The system enables the establishment of a continuous temperature regime, with few fluctuations. Another advantage is that heat dispersal inside the greenhouse is uniform. Control and command are carried out by the central system computer.
- Hot Air Method:
The burner causes combustion in the burning cell. Heat thus produced is ejected and passes over the external walls of the burning cell by radiation and convection. Cold air passing over the burning cell is sucked into the greenhouse cavity, is heated and is then released through the sleeves into the greenhouse. The air circulation process is executed by a centrifugal blower, which is operated by an electric motor. Heat in the greenhouse is dispersed through a system of perforated sleeves
Shade and thermal screens are used to moderate day/night temperatures in greenhouses. They provide uniform shade and some control air movement and enhance the diffused light. Thermal Screens protect against frost and save energy in heated structures.
There are two basic types of thermal screens.
- Open screens which allows air flow through them and are usually used in structures that have roof vents that require upward movement of air and in net-houses where rain needs to pass through the screen.
- Closed screens, sometimes known as energy saving screens, are totally closed and do not allow air movement through them. These screens are usually used in heated greenhouses where energy saving is the main objective.
Vegtech also supplies and installs blackout screens for crops that require daytime manipulation.
Vegtech’s screens are designed and supplied by Alweco, one of the world’s leaders in greenhouse screen systems and a trusted Vegtech partner. Growers can choose what type of cloth they require according to their needs. Vegtech supplies cloth from Polysack-Aluminet™, Svensson or Bonar TF.