SUPPLEMENT ENCLOSURE & SAFETY SOLUTIONS Commercial salad growers box clever
Spelsberg electrical enclosures have been used in a high tech environmental control system for a commercial greenhouse operated by one of the largest salad growers in the UK. Salad growers need state of the art energy
efficiency, lighting and climate control throughout their massive commercial greenhouses. The electrical systems are therefore huge, often linking multiple greenhouses via an interconnected control system. CambridgeHOK, the UK’s leading
manufacturer of commercial greenhouses, has designed, installed and commissioned the infrastructure surrounding four 5.5MW Rolls Royce engines that are used in a combined heat and power (CHP) plant for a major grower on the Isle of Wight. The project was centred on the need to modernise facilities, mainly to ensure energy efficiency but also to improve control and ensure the equipment and technology were premium so that safety and reliability were world-class. It involved the demolition of existing facilities and the building of two new CHP energy centres that serves the massive 27 Hectare (270,000 square metres or 67 Acres) of glasshouses. The new energy centre is home to the latest CHP technology, represented by four Rolls Royce gensets or gas engines, each producing 5,605kW
of electrical power and 6,415kW of heat. State of the art equipment is used throughout, including electrical enclosures from Spelsberg made from high performance engineering plastic. These bring benefits such as more stable internal temperatures, high strength, reduced corrosion and – because they are visible – smart appearance. Electricity produced is
fed into the local grid, while the extracted heat from the exhaust gases and the engine cooling systems will be used
to heat the greenhouses. Further, after cleaning, the engine exhaust gases are injected into the greenhouses to increase the ambient carbon dioxide content in order to promote plant growth. CambridgeHOK selected Spelsberg to supply all the electrical enclosures and junction boxes required for the electrical and control systems. Spelsberg enclosures are easy to install and have good access for fitting the electrical components. Most of the enclosures installed in the greenhouse are Spelsberg GTi and B Box models. The GTi enclosures are a popular choice for situations where requirements for moisture protection are high. They are made from high- grade polycarbonate, so represent a corrosion-free
alternative to steel boxes, and they are designed to be flexible and easily adapted to the requirements of the application system. Thanks to their modular design and open sides, they can be expanded or connected to adjacent GTi’s – without the need for snapping away side walls. In fact they are always a favourite with installers, because they can be reconfigured at short notice if the system design changes during installation. The Spelsberg B Box design incorporates raised
terminals, which makes installation quick and easy and also helps keep the wiring orderly and easily checked. The box’s mounting is designed so that it is always secure; this is particularly useful in commercial greenhouses where operatives tend to focus on the crop yet work in close proximity to electrical systems, so an insecure fitting could represent a significant risk. Further enhancing the robustness of the fitting, B Boxes have eight M20 threaded cable entries that do not require an extra lock nut. Also the wire clamping technique is inherently space saving and there is a condensation opening on each side wall. Helping CambridgeHOK maintain its project schedule, the B Box can be assembled without tools. Once erected it is completely watertight, a critical attribute considering the need for regular crop irrigation. It is made of a halogen- free thermoplastic so can be used in almost all environments.
Spelsberg
www.spelsberg.co.uk
S12
JUNE 2016 | DESIGN SOLUTIONS: SUPPLEMENT
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