VICTORIAN GLASSHOUSES

To enable modern glasshouse structures to provide accurate research data or produce optimum crop yields, mechanical services are essential as part of an integrated services installation.

Together with irrigation, thermal/blackout screens, COdistribution and control systems, the installation of heating systems should be specifically designed to achieve the required growing environment for your crop.

Heating installations are custom-made for Commercial Glasshouse Production, Garden Centres, R&D facilities for Colleges and Universities as well as, innovative systems for growing, such as vertical farms. Turnkey projects, stand-alone systems, feasibility studies, evaluation of energy requirements and use of heat recovery systems and bio-fuels all form part of the service provided. Plant production including salad crops, bedding, herbs, flowers, tropical, propagating and crops for tests and trials all require individual consideration when designing optimum heating installations.

Warm Air Heating
Used mainly where an overall ambient temperature needs to be maintained. This can be in the form of freestanding air recirculating heaters firing on natural gas, propane or light oil and can be effective where less sophisticated control is required. Units will have independent flue systems and may also be used for ventilation during summer months.

Hot Water Systems

Pipe rail systems

Generally used in the commercial production of certain salad crops (i.e. tomatoes, cucumbers, peppers, etc) and are also used with fruit crops such as strawberries. These installations provide controlled heating from pipework located at ground level in specially designed floor brackets that form a rail system. Such installations enable the user to attend to all crop management and be able to pick the produce from electrically operated trolleys running on rails between the crop rows.

Monorail systems

This installation uses pipework located at high level giving the crop radiant heat whilst maintaining clear access below, this enables crops to be transferred without obstruction. This type of system is often used in conjunction with lower temperature systems to give a higher heat output and maintain desired temperatures.

Bench and floor heating

Enables growers to provide low grade heat to roots and localised heat to plants. Heating systems may be incorporated in bench tops and in floor areas beneath the plants. This is achieved by circulating low temperature heated water in plastic pipework within the floor construction or within bench tops. (Care must be taken not to overheat and damage plant roots which can be avoided by the use of close control of the system)

Grow tube heating

This installation comprises of smaller heating tubes which are controlled independently from the main heating system. Located in close proximity to crops being grown, these tubes provide a localised heat boost and assist in the control of humidity. These tubes are usually steel, although polypropylene tube is an option for some fruit crops. Automated lifting systems are often employed where grow tubes are installed to give radiant heat over crops grown on benches.

Feed water heating

Where controlled drip feed irrigation systems are provided to crops, it is essential that this is not supplied below the required temperature as this can be detrimental to plant growth. To avoid this, you can pass water through a heat exchanger or install a heating coil in the feed-water storage tank.

Heat Generation and system options

Various heat source options are available to provide heat requirements for a modern glasshouse project, as well as several energy efficient system alternatives which can be incorporated within the design to suit individual client needs. These installations may range from small heat pumps/AD plant and renewable energy to complex CHP, Biomass boiler and large heat storage buffer tank systems for large commercial nurseries

Modern production installations will often incorporate pre-insulated underground mains, large insulated heat storage tanks with integral expansion system, monitored water treatment systems and COdistribution systems generated from in house plant room

Facilities and services offered by CambridgeHOK

  • Liaise with Clients
  • Site surveys
  • System design
  • Material specification
  • Estimating
  • Preparation of installation drawings
  • Submitting Quotations
  • Contract agreement
  • Material ordering / labour programming
  • Site supervision
  • Commissioning of installations
  • Sundry Sales
  • Modifications to existing systems
  • Assessment of Insurance Damage

Renewable Technologies
Reducing energy costs and CO2 emissions is something which is very much in the forefront of growers and developers minds, and as a leading horticultural company we have developed the expertise to offer the complete package.

Predominantly the second highest cost to the grower is energy, and with costs spiralling, it is crucial to look into alternative energy production. With the available support of the government backed Renewable Heat Incentive (RHI), growers are turning toward Bio-Boilers on a large scale.

Working closely with our partners at Energy4Growth we are able to specify and design energy solutions to meet the heat and CO2 profiles for your growing needs. With paybacks of approximately 3 years against oil and 5 years against natural gas, the RHI changes the way we think when it comes to maximising crop yield against energy costs.

With the in house expertise not only encompassing experienced M&E Engineers, but also Structural and Civil Engineers. CambridgeHOK can design and install the complete energy solutions with all of the associated services. We have worked on multiple projects including:

  • Large Scale Biomass Boilers
  • Absorption Chillers
  • Bio-Gas CHP
  • Anaerobic Digesters

Cambridge HOK are looking forward to working with growers as we together, we develop schemes to integrate new technologies with new and existing glasshouse systems.

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