ISHS Acta Horticulturae 162: Symposium on CO2 Enrichment
GREENHOUSE HEAT BALANCE AS INFLUENCED BY CO2 -ENRICHMENT |
| Author: | Ing. K.R. Nawrocki |
| Abstract:
In horticulture, CO2 (Carbon dioxyde) is introduced into the cultivation volume of greenhouses to promote the rate of plant growth. Growth rate is dependent on temperature, light intensity and CO2 concentration. Carbon dioxyde gas is extracted from the flue gasses of the central boiler or from natural gas burners especially installed for the purpose. The present research was initiated in answer to the constantly recurring question as how much of the heat, released with CO2-enrichment, can be used for greenhouse heating. This is an important data in feasibility studies for reject heat projects or heating with alternative fuels, The useful heat released by CO2-enrichment will reduce the amount of reject heat which has to be withdrawn. Another question is whether or not the heat, which can not be used immediately, can be stored economically. In order to determine which part from CO2-enrichment is used to heat the greenhouse, it has been found necessary to make up a heat balance. The heat balance shows that the heat requirement of the greenhouse depends on the temperature difference between inside and outside, the incident daylight, the use of energy screens during the hours of darkness and the exchange of ventilation air. | |
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