Greener Greenhouses (download)

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Greener Greenhouses

Over the last 50 years, there has been enormous expansion in the use of greenhouses worldwide. Much of this growth has taken place in countries such as Australia, where the climate is very different from that in Northern Europe, where the earliest developments in modern greenhouse design and operation first took place.

In recent years, there have been significant advances in the improvement of greenhouse environments, specifically in greenhouse design, covering materials and environmental control technologies. Energy efficiency for heating, ventilation and cooling, and climate control systems that provide growing environments that accord with the plants’ optimum environmental conditions, are now important considerations.

Climate variability, extreme levels of solar radiation and relative humidity present particular problems for Australian greenhouse growers who are, at the same time, experiencing an increasing demand for the production of high quality vegetable, flower and ornamental plants at competitive prices.

Greener Greenhouses is the result of years of research and experience by the author in the field of greenhouse construction, design and technology. Presenting practical advice to help growers identify and attain optimum growing conditions in the greenhouse, the authoratative text is an essential handbook for greenhouse growers located in warm countries.

e-Book 2016
Format – PDF (press quality) – Pages 136
(Also available in large format printed edition)
ISBN 0-9586735-9-4

(Upon purchase, download this e-Book directly from ‘Track Your Order’.)

CONTENTS

FOREWORD

BACK TO BASICS

  • Greenhouse Origins
  • Why have a greenhouse?
  • How a greenhouse works
  • Plants and their environment
  • Temperature
  • Humidity
  • Solar radiation
  • Carbon dioxide
  • Air movement

COMPARISON OF VARIOUS DESIGNS

  • Gable roof glasshouses
  • Curved roof greenhouses
  • Sawtooth and skillion
  • Gothic arch

GREENHOUSE COVERING MATERIALS

  • The sun, solar radiation and its effects
  • Greenhouse covering materials & how they react to radiation
  • Glass and the ‘greenhouse effect’
  • Plastic covering materials

GREENHOUSE VENTILATION & COOLING

  • Greenhouse overheating and ventilation
  • The ventilation rate
  • Buoyancy
  • Types of ventilator
  • Screened ventilators
  • Shading
  • Thermal/shade screens
  • Evaporative cooling
  • The psychrometric chart
  • Evaporative cooling systems
  • Packaged evaporative coolers
  • Fan and pad systems
  • Poly duct systems
  • Evaporative cooler control
  • Evaporative pads, performance and system maintenance

GREENHOUSE HEATING

  • Ventilation and air leakage
  • Heat loss through the covering material
  • Convection from the inside air to the cover
  • Condensation
  • Thermal radiation
  • Heat loss from the cover to the outside
  • Convective heat loss to the outside
  • Thermal radiation heat loss to the outside
  • Heat loss to the floor
  • Overall heat loss
  • Greenhouse heating fuels
  • Piped hot water or steam
  • Greenhouse space heating
  • Underbench heating
  • Greenhouse floor heating systems
  • Water flow rates in heating systems
  • Flow rates for heat distribution
  • Flow rates for air flushing
  • Friction losses in pipe systems
  • Flooded floor heating systems
  • Hot air systems
  • Free discharge systems
  • Propagation bench heating
  • Electric heating cables
  • Mineral insulated metal sheathed heating cables
  • PVC insulated copper cables
  • Installation of heating cables
  • Hot water heating for propagation
  • A final word on greenhouse heating

ALTERNATIVE SOURCES OF HEAT

  • Hot water from waste heat or thermal hot water
  • Solar ponds
  • Heat pumps
  • Wind energy
  • Infrared heating

SOLAR GREENHOUSES

  • Solar air heaters
  • Energy storage
  • Rock pile charging
  • Design volume
  • Solar greenhouse configurations
  • External free standing
  • Under-bench rock piles
  • Fan selection
  • Capacity
  • Pressure drop
  • Solar hot water systems
  • Concentrating collectors
  • Passive systems
  • Passive storage using drums of water
  • Passive storage using water and polyethylene tubes
  • Energy storage using Phase Change Materials (PCMs)

CLIMATE CONTROL

  • Single step on/off control
  • Multi-step on/off control
  • Proportional control
  • Modulating control for hot water systems
  • Limitations of conventional control systems
  • Sophisticated control system for maximum accuracy
  • Computer control
  • Sensors

CONSERVING ENERGY

  • Convective heat loss
  • Double poly covers
  • Rigid twin-wall materials
  • Thermal radiation
  • Air filtration or leakage
  • Overall heat loss
  • Temperature distribution
  • Proper placement of heat
  • Selective setting of thermostats
  • Wind breaks
  • Greenhouse surface area
  • Thermal/shade screens
  • Economic considerations

SMALL GREENHOUSES

  • Heating
  • Ventilation and cooling
  • Solar options

WATERING AND MISTING SYSTEMS

  • Overhead sprays
  • Pot watering
  • Misting systems for propagation benches
  • Misting sprays
  • Mist controllers
  • Time controllers
  • Balance arm mist controller
  • Electronic artificial leaf sensor controller
  • Radiant energy sensing controllers
  • Solenoid valves

ARTIFICIAL LIGHTING

GENERAL INDEX

Price: $19.95
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