The transition from SON - T to LED lighting provides meaning saving on free energy costs for many horticultural company , but also leads to newfangled challenges . After all , the mood in the glasshouse change under full LED , as is the grammatical case at Rose Nursery Marjoland . A Luxous 1147 FR Department of Energy screen , perpendicular lover from ClimaFlow and an extra growing tube at the top of the nursery are used to better manage the radiation , moisture balance and heat distribution .
Marjoland chiefly grows Red Naomi and nine other cut rose cultivar ( entire 20 ha ) in Waddinxveen and is look at one of the best rose growers in the Netherlands . The switch from SON - T to LED inflammation bug out twelve twelvemonth ago and is expected to be fill in next year . " We are now in full in that transition process . Now that we have been working with full light-emitting diode for a few age , we see that the mathematical product quality is increase , compared to SON - T. Twelve year ago we started with light-emitting diode as interlighting . In 2018 we start linearly on 1 ha , from 2020 we get down investing heavily in LED . We have now exchange 75 % of the SON - T lamp with dimmable LED . This transposition to full LED intend a unlike nursery climate . Hence our investment in detachment and dehumidification " , tell Daniel van den Nouweland , General Manager .
Insulate the greenhouseEnergy deliverance is one of Marjoland ’s major challenges , say the director . " It is now becoming increasingly unmortgaged that electric automobile is becoming more interesting than gas . We will be able to use the CHP engine less and less in the come ten years . It will still be interesting until 2035 , but with few and few operating hours . That is why we are also looking at how we can gradually move to 100 % full - lead . The first step is to insulate with screens , so that we can keep even more energy . In addition , undertaking is a challenge for us , the bounteous one I remember . " Marjoland-4 , a 6.8 hour angle division , will switch to full light-emitting diode before the end of this year . The energy blind has just been install . Cultivation Manager , Erwin van Adrichem : " Until then , we only had a light discharge and sun trade protection cloth . Because we desire to miss as little light as possible , we chose the Luxous 1147 FR . The light transmission is very significant to us . "
measuring sieve performanceAccording to Svensson Climate Consultant Bart Bakker , the Luxous 1147 FR is the brightest energy screen presently available . The 11 stands for 11 % light loss , the 47 for the energy rescue per centum . But are these figure in reality right ? " About 65 % of the Light Within in the Netherlands is diffuse , especially in wintertime . I think that is why you should always calculate at a silver screen textile under diffuse weather condition , that is also the moment that you close up the energy screen in the nursery . A light loss of 11 % actually never pass , because that is measured sheer . The sunlight is never vertical to a covert in the Netherlands . If we measure according to NEN standard 2675:2018 , the light loss is 18 % , because we let in the reflexion in that and you miss that reflected illumination . With diffuse brightness , the light expiration is 25 % . That is the honest story . This is natural light source , which is free . You want to get as much of it as possible . " I think that ’s why you should always choose the brightest screen . "
Using outdoor lightVan Adrichem confirms the grandness of lifelike Light Within : " We have between 300 and 360 µmol / m2.s hanging here . We illuminate all class around to guarantee a constant timbre , so also in the summer . Our LED luminaires contain violent , blue , far - ruby-red and greenish to create white . I think we are on the right side with that , but a SON - liothyronine lamp looks more like the sunlight than an LED lamp . So we find that bit of outdoor light very authoritative . If the Dominicus shines for half an hour today , everything just opens , so to speak . At the back of Marjoland-3 ( 4.8 hour angle ) we have had this screen for a year now . Not only for vim saving , but also for the climate . "
Energy preservation and climateHumidity becomes more unmanageable under LED , the Cultivation Manager keep on . For that reason , Marjoland has brought a tube up under full LED , for honorable warmth distribution . The party was also one of the first to get using perpendicular external respiration . " With the beamy heat , you may more easy remove wet . We in reality did n’t desire that surplus heat near our roots , but rather above under the trellis . We mainly purchased the ClimaFlow system for a more even clime . They are very long path , 125 beat leave and correct , in a comparatively down in the mouth greenhouse with a gutter height of 4.5 metre . Then you speedily find that you get climate differences . Thanks to the ClimaFlow system of rules , we also dared to change a Lord’s Day - tolerant cloth for an energy cloth . I would n’t defy do that without the possibility of dehumidifying or air out . "
The ClimaFlow system spend a penny crack a thing of the past , because you could close them 100 % more frequently , says Van den Nouweland . " A more even greenhouse clime is the most significant reward and indirectly , we also get the energy savings . " Van Adrichem : " We no longer leave behind gaps when the external temperature is below 16 degrees . In some geological period we go to 19 degrees . You are now simply the boss of your mood . "
Replacement of minimal tubeAccording to Dominique Blok , Account Manager of ClimaFlow , their rooter has become the permutation for the minimum tube . " The free energy you put in with a lower limit tube-shaped structure is one - off . Then you have to give vent , because you want that perpendicular atmosphere movement . We provide a nice active clime in the form of a light breeze that goes through the craw . " agree to Van den Nouweland , there is possible in upright ventilating system : " There is still some strangeness around air movement , yes . We see positive developments in that , also in the area of product . If we leave a gap , you have a difference of 5 to 6 grade in certain slant . If the blind is closed , I think the remainder is within 1 degree . With those VentilationJets you distribute the refreshed , dry air nicely and equally over the greenhouse . " Cultivation Manager , Van Adrichem agree : " The more equal your climate , the more you’re able to develop . "
New pull wireHanging the fans in the 4.5 - meter - high greenhouse was a snug call . Dave Boer , commercial director of installer Huisman : " The get-up-and-go screen had to be placed underneath in terms of installation space , there was no other agency . It was a challenge to make it set . The fans had to be integrated into it . There were also crop in the section . No damage may hap to the harvest and the people themselves must also be able to preserve working . We use special assembly trolleys for this . We have also evolve a new type of wrench wire that can handle ten prison term more screen movements . With modern concealment , much more movement is done . Being able to slice precisely is still important , but with these fans you have the luxury of having to do that much less often . "
For more information : Ludvig Svensson[email protected]www.ludvigsvensson.com
