Greenhouse Layout With Reflective Yard and Insulated Roof
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Solution Overview
Problem
Greenhouses in northern latitudes face high energy consumption due to poor thermal insulation and the need for additional lighting, as existing designs are suited for southern conditions and fail to efficiently manage light and heat in cold climates.
Innovation Solution
A greenhouse design featuring light reflecting surfaces integrated into the yard surrounding the building, which direct light efficiently into the greenhouse year-round, combined with a thermally insulated fixed ceiling and opaque north wall, and the use of solar cells and roller curtains to minimize energy loss and light pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If glass roofs and walls are used to allow sunlight entry, then light utilization is improved, but thermal insulation deteriorates leading to high energy consumption in winter
Solution Approach 1:
The greenhouse structure is segmented into transparent sections (for light entry) and opaque insulated sections (for thermal retention). The ceiling is completely opaque with high thermal insulation, while walls and partial roof areas remain transparent. This segmentation allows simultaneous optimization of light utilization and thermal insulation by assigning different functions to different parts of the structure.
Solution Approach 2:
Different parts of the greenhouse have different optical and thermal properties tailored to their specific functions. The ceiling has high thermal insulation (U-value 0.15 W/m²K) and is opaque, while selected wall and roof portions maintain transparency for light entry. The light-reflecting surfaces have specific reflectivity properties directed toward the greenhouse interior. This local differentiation of properties resolves the contradiction between light transmission and thermal retention.
2Productivity
If translucent surfaces are maximized for light entry, then photosynthesis efficiency is improved, but thermal load becomes excessive in summer
Solution Approach 1:
The transparent surface area is segmented and limited to specific orientations and locations that optimize winter light capture while minimizing summer overheating. The ceiling is completely opaque to block excessive solar radiation, while transparent walls and partial roof areas provide controlled light entry. This segmentation prevents excessive thermal load during summer while maintaining adequate light utilization for photosynthesis.
Solution Approach 2:
The greenhouse incorporates dynamic elements including movable light-reflecting surfaces and adjustable roller curtains that can modify the effective transparent area and light reflection angles according to seasonal and daily conditions. This dynamic adjustment allows the structure to adapt to changing solar angles and thermal requirements throughout the year, preventing summer overheating while maintaining winter light utilization.
3Loss of energy
If opaque roof is used for thermal insulation, then energy loss is reduced, but light reflection and utilization deteriorates
Solution Approach 1:
External light-reflecting surfaces are introduced as intermediary elements that capture sunlight outside the greenhouse and redirect it toward the interior through transparent sections. These reflective surfaces (with reflectivity ≥0.6) act as mediators, bringing additional light into the greenhouse without requiring the roof or walls themselves to be transparent in those areas. This allows the main envelope to remain opaque for thermal insulation while still achieving enhanced light utilization through the intermediary reflective elements.
4Loss of energy
If structural insulation measures are implemented, then thermal insulation is improved, but additional lighting is required to maintain luminous efficiency
Solution Approach 1:
Light-reflecting surfaces are installed outside the greenhouse structure in advance to pre-capture and redirect sunlight toward the interior before the light would otherwise be lost. This preliminary action of light redirection occurs naturally through passive optical elements, supplementing the light available inside the greenhouse before any artificial lighting needs to be considered. This allows structural insulation measures to be implemented without immediately compromising luminous efficiency, as the reflective surfaces compensate for reduced light transmission.
Solution Approach 2:
The greenhouse system uses passive optical elements (light-reflecting surfaces) that automatically redirect sunlight without requiring external energy input or control systems. These surfaces self-adjust based on their fixed or movable geometry to capture and redirect light throughout the day and season, providing continuous supplemental illumination that compensates for the reduced light transmission from opaque insulated sections without requiring additional artificial lighting.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces energy consumption by up to two-thirds compared to traditional greenhouses, enhances light utilization, and minimizes environmental impact by reducing fossil fuel use and light pollution, while maintaining structural integrity in snowy conditions.
Implementation Method 1
the outside walls are provided with light reflecting surfaces which at the same time form a part of a yard solution surrounding the building... the light reflecting surfaces direct beams of light arriving at all times of the year efficiently into the greenhouse
Implementation Method 2
The insulating material thickness of the ceiling may be set to a desired level, e.g. by increasing the insulating material thickness of a roof... enables significantly better coeffcients of thermal transmittance, i.e. U-values, to be achieved
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a greenhouse comprising outside walls provided with translucent surfaces (2) such that light may be received into the greenhouse (3) from at least two geographical directions, a roof structure (7) and a roof (6) provided with an insulating material portion. The invention is characterized in that the outside walls, in connection with the translucent surfaces (2), are provided with a light reflecting yard structure which resides below the translucent surfaces (2), above a ground surface (50), and extending away from the outside wall. The greenhouse (3) may further comprise vertically positioned light reflecting surface elements (40) and light reflecting shade elements (44) movable in a direction parallel with the transparent surfaces (2).