Greenhouse heating
Bio Green electric heaters have been designed
for greenhouses and conservatories.
The technology that we have developed ensures that the temperature is maintained reliably at a reasonable level with no energy-wasting temperature peaks in the greenhouse. The energy savings that are made are not due to half-hearted heating but to sensible use of the available energy.
Heating a greenhouse – the challenge
To keep a greenhouse frost-free, the temperature must remain above 0°C even in the corners. If the current of air does not reach there, then the temperature on the heater has to be really high, however, then a large proportion of the warmth goes up into the gable of the greenhouse, where it is not needed, while the corners may still dip down to minus temperatures.
(see Diagram 1)
Diagram 1: Traditional system: High input temperature, little circulation, the heat rises and cold corners remain.
This is an unsatisfactory state of affairs,because heating energy is being wasted. In addition, there may be a significant temperature difference between when the heater switches on and off, especially with cheaper thermostats.
This means if the thermostat has a switching differential of, for example, 6°C then the greenhouse has to be heated up to 8°C if it is not to fall below the frost-free limit of +2°C before the heating switches on again automatically (see Diagram 2 & 3).
Diagram 2: BioGreen greenhouse heating: Lower input temperature and high
ventilation ensures even heat distribution.
Diagram 3: Control curve for a cheap thermostat with a large temperature
differntial.
Bio Green heaters avoid this unnecessary heating up by keeping the switching differential to a minimum, as can be seen from Diagram 4.
Diagram 4: Control curve for a high quality thermostat with a small tempera-
ture differential.
This results in significant energy savings. This is why we as greenhouse specialists have developed a range of heaters which offer important advantages: High ventilation rate up to 460 m3/h .
The fan setting
By using the fan setting, all the air in the greenhouse can be circulated even in the
summer season. With the window open and the fan on, the greenhouse can be cooled down. Air circulation in the summer is also necessary for the pollination of many flowers.