Numerical Analysis of the Effect of Ground Dampness on Heat Transfer between Greenhouse and Ground

Abstract

This paper deals with the problem of the influence of ground dampness on heat exchange between greenhouse and ground. The effect of humidity on the distribution of ground temperature fields was analyzed. The analysis was performed based on the analytical numerical method in the WUFI®plus software. The computational tool was used after a validation process. Research and simulations were conducted on the example of a real single-span greenhouse located in Southern Poland. The results of indoor and outdoor air temperature measurements were used to determine the boundary conditions, while the measured ground temperatures were used to compare with the results of theoretical calculations. Three variants were used for calculation analysis, assuming different levels of ground dampness. Analysis of the test results showed that during the summer period, dry ground provides 8% more thermal energy to the interior of the greenhouse than the damp ground, and provides 30% more thermal energy than wet ground. In the transition period (autumn/spring), the ground temperature fields are arranged parallel to the floor level, while the heat flux is directed from the ground to the interior of the greenhouse, regardless of the ground dampness level. During this period, the ground temperature ranges from 4.0 °C to 13.0 °C. Beneficial effect of dry ground, which contributes to maintaining an almost constant temperature under the greenhouse floor, was found in winter.

Optimisation of Building Green Performances Using Vertical Greening Systems: A Case Study in Changzhou, China

“…In order to minimize the potential impact of the interaction between the building greening system and the ground [41,42], a comparison of the rooms in group B on the first floor is not included in this section. Analysis of the thermal inertia involved a comparison of the thermal indicators for A1 (without a VGS) and A2 (with VGS) in group A on the second floor.…”

Interaction between a Cyclically Heated Building and the Ground, for Selected Locations in Europe

“…However, agricultural buildings require constant broadening of knowledge in this area. The nature of this phenomenon is influenced by a number of factors, such as the purpose of the building, the material and construction solutions used, soil and water conditions, and the way the building is used [12][13][14]. The location, which determines the nature of geographical climatic factors, is also very important for the course of interaction between the building and the external environment [15,16].…”