CULTIVATIONTIPS DELPHY Energy consumption and risk By Jan Gielen
Climate & Energy Specialist Delphy Mushrooms
j.gielen@
delphy.nl
Photo: Jan Gielen
of infection at cook-out A lot of energy is consumed to cook-out a full growing room. To save costs, many different variations of cook-out are applied in practice, some of which reach, or even cross, the borders of potential infection risk. Based on measurements performed on five farms, cook-out consumes around 130 m3 gas per growing cycle/100 m2. This equals about 55 % of the total gas consumption! Spore pressure measurements were also taken to determine the potential risk of infection with the various methods of cook-out. As many spores are left behind on compost residues, cook-out is only effective when combined with meticulous cleaning. Some spores can still be found on the floor (which remains a little colder) after cook-out for six hours at 60 °C. No spores were found after cook-out for six hours at 65 °C. This leads to the conclusion that effective cook-out is achieved at 65 °C for six hours. In that case, the growing room is free of infection. The grower decides whether cook-out is done in a full or empty room, depending on the pressure of diseases and infections on the farm, the duration of the growing cycle and any requirements imposed by legislation.
Table energy saving, infection free methods of cook-out compared with six hours cook-out in a full room at 70 °C
Cook-out methods
minimum 6 hours compost 70 °C full minimum 6 hours compost 65 °C full minimum 6 hours air 70 °C empty minimum 6 hours air 65 °C empty
Approx. gas consumption 130 m3/100m2 growing surface 113 m3/100m2 growing surface
% energy saving reference 13%
73.5 m3/100m2 growing surface 43% 64.7 m3/100m2 growing surface 50%
Summary energy saving possibilities cook-out: • More limited cook-out if infection risk permits (see cook-out methods table). • If possible, wait a few hours before starting cool-down. • Do not set fan speed too high (e.g. 10 % higher than during pinheading). • If steam boiler is in continual use, flue gas condenser will quickly become profitable.
Rectification
An error occurred in Jan Gielen’s tip in Mushroom Business 75 (‘stable climate’). Please read ‘valves’ instead of ‘inlets’ or ‘air inlets’.
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