A Dynamic Thermal Performance Simulation Model of an Energy Conserving Greenhouse With Thermal Storage

Abstract

ABSTRACT A transient rather than steady-state analysis is required for accurate prediction, modification and control of a greenhouse thermal environment. In this study a dynamic mathematical model for predicting temperatures and moisture levels in a solar-assisted energy conserving circular (hoop) type greenhouse was developed. The greenhouse used in the development and testing of the model had added thermal mass in the form of water located under plant benches. Active and passive forms of thermal storage were investigated. Other energy conservation features incorporated in the test greenhouse included arch shutter thermal insulation applied in-between the double-layered inflated transparent plastic covers at night to reduce heat losses or heat gain. The greenhouse thermal model was programmed on a digital computer and comparisons of the greenhouse measured variables with model predictions showed a high degree of correlation.