Abstract
Commercially available greenhouses are commonly used for provision of year-round growing of agricultural crops at protected ground. In order to provide favorable conditions for plants growth these agricultural constructions should be equipped by artificial heating systems in cold sea-sons. This work presents an overview of basic traditional and alternative heating systems which find their applications in agriculture. Advantages of application of roof radiant heating with infrared radiation sources for green-houses are discussed. It was discovered that now there is no appropriate mathematical model of greenhouse radiant heating, which takes into account both heat and mass exchange processes. Here we propose a mathematical model of radiant heating, which includes equation system of both heat and mass exchange processes for greenhouse, its enclosure and soil. The numer-ical calculations were performed for commercially available greenhouse “Farmer 7.5”. We investigated the impact of external air temperature and heat exchange rate on the following greenhouse radiant heating characteris-tics: internal air temperature, heating system thermal power and water dis-charge for soil watering.
Highlights
The considerable part of northern countries and Russian northern territory are non-favorable regions for open-ground planting
Since the heat losses through greenhouse enclose are directly proportional to external air temperature text.air, so when it decreases, the temperature of the air in the room becomes less too
The heat losses related to ventilation air, which is leaving the greenhouse are the first one to increase when heat exchange rate grows
Summary
The considerable part of northern countries and Russian northern territory are non-favorable regions for open-ground planting. This is due to specific climate conditions: long-lasting and severe winter and short, not always warm summer. The ground-protected constructions are extensively used as they artificially provide necessary conditions for plant growth. All ground-protected constructions can be divided into the following groups according to their capability of meeting the plant requirements: cold frame, greenhouse, warmed soil. In contrast to cold frames and warmed soil, greenhouses provide favorable conditions for plants growth, but protection of working people from unfavorable climatic factors [5]
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