Energy efficiency is a measure of energy used for delivering a given service. Improving energy efficiency means getting more from the energy that we use. DECC - Energy Efficiency Strategy: 'The Energy Efficiency Opportunity in the UK'
  • The use of thermal screens has become common place on many edible crop nurseries. They've been shown to save large amount of energy, paying back their cost quickly. In 2005, HDC project PC 198 showed that a thermal screen could save 100 kWh/m2 p.
  • Similar to the Feed-in Tariffs for renewable electricity, the Renewable Heat Incentive (RHI) is aimed at significantly increasing the proportion of heat generated from renewable sources. It is a commitment by the government to long-term financial support, paying a fixed amount per kilowatt-hour (kWh) of heat produced over a 20-year term, adjusted each year for inflation.
  • This guide from the Horticultural Development Company (HDC) provides guidelines on all aspects of CO2 enrichment for tomato growers, including:
  • When growing greenhouse crops, it’s sometimes desirable to use a little more heat than strictly necessary to maintain adequate growing conditions. The purpose of this is to keep conditions comfortably away from those which could, for instance, trigger a disease problem.
  • Supplementary lighting can be controlled in a number of different ways, ranging from simple manual switching through to automatic control using a climate computer.
  • Because supplementary lights also produce heat, they can have a sudden impact on the temperature balance of a greenhouse when they are turned on.
  • What are the energy implications of using ‘pre-night’ or ‘drop’? ‘Pre-night’ is a technique used by some edible crop growers who believe that a rapid drop in greenhouse temperature just before sunset helps crop development.
  • In our article 'Where should you position your measuring box?', we showed how relying on a measuring box placed in the traditional position at the top of a tomato crop can give non-optimised control of the greenhouse environment and lead to wasted energy.