Greenhouse construction company Certhon is working firmly on a new 3.3 - hectare nursery for Phalaenopsis nursery Opti - flor in Monster , The Netherlands . one-half of the greenhouse is dedicated to the warm cultivation phase , which operates at 28 ° C . Numerous measures have been implemented to aggregate consummate growing condition with limited heat input , with combat-ready ventilation from Van Dijk Heating ’s AVS system playing a key role .
The design of the new nursery was cautiously considered , as Phalaenopsis is an energy - hungry harvest , and energy cost are presently high . Until 2027 , when the new refinement site is set to unite to the Vogelaar geothermal heat source , a fuse heat and power organization will leave the necessary gamey - mark hotness .
" With a compounding of geothermal vigour , heat ticker , and rut / cold-blooded storage in aquifers , we can sustainably meet our heating needs , " explain Rens van Antwerpen of Opti - flor . As a cultivation and energy manager , he has extended experience with technological innovation , in which the company is once again pushing boundaries . " In the fond incision , additional heating mental ability is needed to boost low - level oestrus efficiently to 28 ° C greenhouse temperature . We also want effective melodic phrase circulation , vapour , and dehumidification , especially under shut screen . "
radical - gamey - spec greenhouseThe roof features Geysir mellow - diffusing ( 45 % hortiscatter ) , low - e AR trash ( Geysir ) overstep with a movable outside screen for summer cooling and blending . The external paries are made of insulate sandwich panels . Beneath the cap are three movable energy - saving and blackout screen .
" The greenhouse itself is fairly straightforward , but very well equipped , " Van Antwerpen add . " The vents are suit with insect screens . This also calls for a high capacity for internal recirculation and ventilation via the AVS units . We now have 36 of these along the external rampart for an domain of 1.5 hectare . "
Jim van Zeijl ( left ) and Rens van Antwerpen near one of the 36 AVS units that are all-important for efficient clime control condition in Opti - flor ’s new greenhouse complex
Air movement gain a uttermost of 16.8 m³/m²/hour , with an input of up to 7.5 m³/m²/hour . " We by choice choose for a high capacity than in our R&D greenhouse , which also has AVS social unit . They perform well , but we ’ve typeset the bar higher for ourselves , and it ’s also more efficient not to execute the system at full power . This keeps us elastic and in ascendence in all situations . "
Extensive discussions and calculationsSuch a complex setup and ambitious goals need all-embracing discussions and calculations . The greenhouse building society , the client , and AVS supplier Van Dijk Heating worked closely together on this .
" These task are exciting because of their sheer complexness , " allege Joek van der Zeeuw , who was involved on behalf of Van Dijk Heating . " They really allow you to showcase your capability . Rens arrange out his priorities and limits in terms of control very intelligibly . The AVS system was dimension ground on those . "
speedy dryingA key requirement was that the harvest should dry quickly after watering . As the pipe heating essentially only turn to the need for upward draught and moist assimilation , drying and dehumidification are handle by the AVS units . This is mainly achieve through interior atmosphere circulation . When needed , drier and cool outside air is mixed in and brought up to greenhouse temperature inside the unit of measurement . The fans and air statistical distribution hoses do the rest .
Before structure began , Van Antwerpen explained the relationship between climate ascendance and product caliber to Certhon CEO John van der Sande
Cascade heatingThe heating system is designed through shower ascendance . " This result in high energy efficiency through maximal cooling system of the heating water , " explains Jim van Zeijl on behalf of Certhon . " The vacuum tube heating plant organization is divided into an upper and lower meshing . The upper meshwork is feed in with high - degree heat . The mixing groups are fit with an additional commixture valve , tolerate the yield water from the upper grid to be used for the lower grid . The same principle is applied to the AVS organisation ; return urine from the humble internet is used as a supply for the AVS cabinet leave in a humble return key temperature in the transport pipeline circuit . If necessary , hot weewee is first add up to bring the air up to greenhouse temperature . In this way , you achieve the greatest potential cooling down of the append geothermal rut .
" This system requires exact control of the valve positions and the fan speed of the AVS unit of measurement , " adds Van der Zeeuw . " We use standard Modbus protocols for this , which are both precise and reliable . "
Getting startedEarly August 2025 the raw glasshouse will be ready for use . Until then , it is a work in progress for Certhon and other declarer . " The builder are give birth a toughened time with all the bad weather , but they ’re doing a great problem , " Van Antwerpen handler says . " It ’s a exclusive right to work in such an amazing greenhouse and hopefully push a few more boundaries . It will never be perfect , but so far we ’ve managed to make progress in every new greenhouse . I ’m sure-footed that will happen in this one too . "
For more information : Van Dijk heating+31(0)30 656 38 44[email protected]www.vandijkheating.com
