ISHS Acta Horticulturae 162: Symposium on CO2 Enrichment
A TECHNICAL AND ECONOMICAL EVALUATION OF A CHARCOAL-BASED COMBUSTION SYSTEM FOR CO2-ENRICHMENT |
| Authors: | S. Rustad, T. Olsen, P. Thoresen |
| DOI: | 10.17660/ActaHortic.1984.162.20 |
| Abstract:
Seasonal daylight CO2-enrichment of the greenhouse atmosphere has become internationally accepted as a means of increasing the quality and yield of various plant cultures. Due to Norway's long heating seasons without need for ventilation cooling, CO2-enrichment is here feasible for extended periods of the year. Liquid bottled CO2 dominates over exhaust gas from propane and kerosene burners as a gas source in most Norwegian applications, because of the latter's unreliability with regard to critical pollution levels. A charcoal-fuelled burner with very stable and complete combustion has been developed by NDRE in cooperation with the Agricultural University of Norway (NLH), The University of Oslo (UiO) and The Norwegian Institute of Technology (SINTEF). Polution levels (0.5 ppm NOx and 1 ppm CO in diluted flue gas containing 1500 ppm CO2) seem to be low enough for many greenhouse applications, and the system is economically interesting, both because of the low cost of CO2 (NOK 0.70 per kg) and the associated heat production (3.0 kwh per kg CO2) which may be fully utilized throughout the heating season. If alternative cooling schemes are chosen instead of the normal ventilation procedures, extended use of CO2-enrichment should also be possible well into the warm season. With a 12-hour heat storage capacity, a combined CO2- and heat-producing system could then be optimally used for daytime CO2-enrichment and nighttime heating. | |
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