Traditional solar greenhouse wall combines the functions of heat preservation and heating. It cannot accommodate both heat storage and insulation that the heat stored in the wall is uncontrollably lost as the temperature difference between the interior and exterior increases.
Therefore, the thermal performance of solar greenhouse walls relies on composition and thickness. The proposal for appropriate wall designs has been extensively investigated through the modification of materials and structural forms, employing numerical simulation and field testing [, , , ]. Fig. 2.
It can be used to retrofit the north wall as well as be a self-contained solar water heating system, suitable for both CSGs and traditional greenhouses. In comparison with current solar heating systems, it has advantages of low cost and no occupation of outdoor or indoor land for installation of a solar collector .
A high thermal capacity north wall is essential for nighttime heating of Chinese solar greenhouses. However, thermal storage ability of the north wall using regular building materials is limited because of their slow heat conduction restricting heat transfer from wall surface to the depth.
This outcome is mainly because the soft film-constructed solar heat collection and release (SHCR) component and the top-down water flow that were adopted in these systems affected their thermal performance. Therefore, exploring a novel technology for more efficient collection and use of solar energy in greenhouses is necessary.
Retrofitting the water wall into Chinese solar greenhouses can make warm-season crop production feasible throughout winter by eliminating supplemental heating. Besides, the water wall-based system can be a self-contained solar heating system, also suitable for traditional greenhouses.
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