Infrared Heating of Greenhouses Revisited: An Experimental and Modeling Study

Kavga, Angeliki; Bontozoglou, V.; Pantelakis, Spiros

doi:10.13031/2013.29208

Cited by 12 publications

(13 citation statements)

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“…This conclusion is contradicting a previous result of the authors obtained with use of a mathematical model developed for the numerical simulation of the experimental greenhouses [13]. This divergence should probably be attributed to the model assumption that infiltration increases proportionally to the wind speed.…”

Section: Dependence Of Ir Savings On Climatic Conditionscontrasting

confidence: 86%

“…The system was an extension of that used by Kavga et al [13] with the addition of a second greenhouse of exactly the same design, dimensions, and construction as the one previously available. Details and justification of the greenhouse design, instrumentation, and operational procedures can be found in the above-mentioned article.…”

Section: Methodology: Experimental Setup and Proceduresmentioning

confidence: 99%

“…These estimates were reached by using the simulation model developed by Kavga et al [13], under the following conditions: plant canopy temperature T p = 15…”

Section: Methodology: Experimental Setup and Proceduresmentioning

confidence: 99%

“…In a previous paper the potential advantages of nighttime heating of greenhouses by modern infrared (IR) radiative sources, instead of forced hot air, have been examined by preliminary experiments and by numerical simulation [13]. Specifically, measurements of indoor and outdoor conditions during typical cold nights in central Greece were Advances in Mechanical Engineering 3 conducted in a scaled down experimental greenhouse, which operated alternatively by forced hot air and by IR heating.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Energy Needs for a Conventionally and an Infrared-Heated Greenhouse

Kavga

Alexopoulos

Bontozoglou

et al. 2012

Advances in Mechanical Engineering

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Infrared (IR) heating as alternative to forced air heating has been studied experimentally for 70 days in two identical, smallscale, experimental greenhouses. The two heating options were implemented with four IR electric lamps and an electric forced air heater correspondingly. The microclimate in the greenhouses was monitored with thermocouples. Parameters characterizing the outdoors macroclimate were also monitored. Lettuce was used as the test crop, and the two heating systems were operated automatically to maintain a suitable reference temperature at the canopy. The investigation focused on night heating needs. Results indicated that the internal air temperature in the IR-heated greenhouse was always kept several degrees lower than the value targeted for the canopy. This lower temperature resulted in 43% average energy savings for the IR-heated greenhouse, compared to the conventionally heated one. A simple numerical model was used to estimate the potential energy savings in a production-scale greenhouse.

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Section: Dependence Of Ir Savings On Climatic Conditionscontrasting

confidence: 86%

Section: Methodology: Experimental Setup and Proceduresmentioning

confidence: 99%

“…These estimates were reached by using the simulation model developed by Kavga et al [13], under the following conditions: plant canopy temperature T p = 15…”

Section: Methodology: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Investigation of the Energy Needs for a Conventionally and an Infrared-Heated Greenhouse

Kavga

Alexopoulos

Bontozoglou

et al. 2012

Advances in Mechanical Engineering

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show abstract

“…This analysis is rather difficult to perform due to the absence of adequate mathematical model for greenhouse radiant heating, which takes into account the relation between thermal and mass-exchange processes occurring in it, while the heat transfer problem is rather well studied for other technological systems [21][22][23][24][25]. All mathematical models presented in literature [26][27][28][29] have some disadvantages. Some of them do not take into account mass-transfer processes, some of them present only mathematical equations without numerical solutions.…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Modeling of greenhouse radiant heating

2018

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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 seasons. 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 greenhouses 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 numerical 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 characteristics: internal air temperature, heating system thermal power and water discharge for soil watering.

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