Heat Transfer Matrix, Heating and Ventilation of Greenhouses
Equations on Heat Flux-Temperature and their Applications (1)
1981 Volume 37 Issue 1 Pages 19-27
Details
1981 Volume 37 Issue 1 Pages 19-27
The stiffness matrix of the finite element method is applicated to the heat transfer of the greenhouse and the equations of heatflux-temperature are extended and improved. It is shown by the equation (5). [K], Eq. (6) and [Kαα]-1, Eq, (8) are the heat transfer matrix of the greenhouse and the heat flux-temperature matrix, respectively. The elements of the matrix [Kαα]-1, which are calculated from Eqs. (10)-(15), are heat transfer coefficients of the greenhouse. These coefficients are different from each other, by the heating position and the measuring point.
From these equations, the equivalent temperatures of the solar radiation and the atmospheric one are found [Eqs. (23) and (25)]. The overall heat transfer and heating load coefficients are also found by Eqs. (32) and (33).
Fig. 6 shows the relation between these values of the hot-air-heated glasshouse, PVC and PE houses and the temperature difference of outside and inside air. Fig. 7 also shows that on the pipe-heated glasshouse.
Required air flow rate on the ventilation is shown in Fig. 8 calculated from Eq. (41).
