ENERGY SAVING IN GREENHOUSE ENVIRONMENT CONTROL: HEATING, COOLING, DEHUMIDIFICATION, SCREENING

C. Cornagliotto, F. Savio
Electronic climate control and regulation systems, developed with the foremost technologies and equipped with close loop control, consent to optimize the growing methodology in two main directions:
  • detection and preservation of the optimum environmental habitat and therefore improving substantially production & quality.
  • "intalligent" management of the greenhouse equipments, with the integration of various mesures produced by the appropriate transducers in different environmental conditions.

Environmental climate conditions are detected by means of accurate transducers as for: temperature, relative humidity, sun radiation, sun light intensity etc.

The electronic regulation system operates in the range established by the operator, however the sun radiation energy becames the main reference function for this control unit. User friendly keyboard and display facilitate control and programming operations.

In this paper are detailed purposes, regulation methodologies and correlations, among algorithms in order to govern and tune four typical indoor climate functions:

Heating:

  • Sunlight intensity control and consequent automatic regulation of temperature at minimun level required.
  • Sun radiation control for valuation of possible heating limitation.

Cooling:

  • Temperature limitation.
  • Evening thermal accumulation control to rise the in-house temperature during the sunset; this programmable temperature increase would be atteined at the end of sunset and hold for a suitable time to save heating energy and avoid critical environmental conditions.

Dehumidification:

  • Ventilation and heating system control to accomplish a limitation of relative humidity rate during the sunset.

Thermal insulation:

  • Shading and thermal screens opening regulation and heating system synchronization during sunrise to avoid condensate formation and quick temperature fall.

Results achieved in some significant applications will be produced with confrontation between the recorded data from an advanced electronid control system (ELFO made by SELEC AUTOMAZIONE) and the traditional "human" regulation.

Cornagliotto, C. and Savio, F. (1989). ENERGY SAVING IN GREENHOUSE ENVIRONMENT CONTROL: HEATING, COOLING, DEHUMIDIFICATION, SCREENING. Acta Hortic. 245, 482-489
DOI: 10.17660/ActaHortic.1989.245.65
https://doi.org/10.17660/ActaHortic.1989.245.65

Acta Horticulturae