Energy efficient greenhouse
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Solution Overview
Problem
Greenhouses in cold weather climates and high latitude or high elevation areas face challenges due to large temperature fluctuations, leading to stress and reduced growth or death of plants as the interior temperature varies significantly throughout the day and night.
Innovation Solution
A greenhouse design with an offset gable configuration, high light transmission materials, and a Ground to Air Heat Transfer (GAHT) system to moderate temperature and increase light intensity, incorporating reflective surfaces, phase change materials, and efficient window placement to manage temperature and light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the greenhouse uses large windows on the south wall and south extension to maximize light entry, then light intensity is improved, but heat loss during night increases
Solution Approach 1:
The south wall is divided into multiple segments: fixed windows, movable windows, and insulated panels. The movable windows can be opened during the day to maximize light entry and closed at night to prevent heat loss. The south extension is segmented into window areas and insulated areas, allowing selective light transmission and thermal control at different zones.
Solution Approach 2:
The greenhouse incorporates movable windows on the south wall that can dynamically adjust their opening state based on time of day and temperature conditions. The south extension roof includes movable panels that can be positioned to optimize light entry during daytime and provide insulation during nighttime, transforming a static structure into a dynamic thermal and optical management system.
2Loss of energy
If the north wall is insulated to prevent heat escape, then thermal insulation is improved, but light transmission is reduced
Solution Approach 1:
The north wall's primary function is converted from potential light transmission to active thermal insulation. By placing the gable offset toward the north and insulating the north wall, the design converts what would be a source of heat loss into a thermal barrier, while the offset configuration ensures sufficient light transmission through the south extension and reflective surfaces.
Solution Approach 2:
The greenhouse employs asymmetric design with the gable offset toward the north wall, creating unequal roof extensions on either side. The south extension has large window areas for maximum light entry, while the north extension is insulated with minimal or no windows. This asymmetric configuration optimizes both light transmission and thermal insulation in different directions.
3Illumination intensity
If the gable is offset toward the north wall to increase south-facing roof area, then light transmission is improved, but structural symmetry is reduced
Solution Approach 1:
The gable is deliberately offset toward the north wall, creating an asymmetric structure with a longer south extension than north extension. This asymmetric configuration maximizes the south-facing roof area and window exposure to capture optimal sunlight, while the north side provides compact insulation. The structural asymmetry is integrated into the overall design rather than treated as a deviation.
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
The design enhances plant growth by maintaining stable temperatures and increasing light intensity, promoting efficient plant production in challenging climates while reducing energy consumption and operational costs.
Implementation Method 1
The inside surface of the north wall may comprise a light reflective surface so that sunlight entering from the south wall and the south extension of the roof, the roof portion between the gable and the south wall, will reflect into the greenhouse enclosure
Implementation Method 2
an exemplary greenhouse comprises a ground to air heat transfer (GAHT) system that efficiently moderates the temperature within the greenhouse
Implementation Method 3
The north wall may be insulated to keep heat generated during the day from escaping and to thermally insulate the interior of the greenhouse from the cold temperatures at night
Data Source
AI summary
A greenhouse, for cold weather climates, is configured with a gable that is offset toward the north wall and therefore the south extension of the roof, from the gable to the south wall is longer than the north extension. A greater amount of light can enter through this south extension and the inside surface of the north wall is configured with a reflective surface to allow light to be more uniformly distributed around the plants. The north wall may no widows and may be thermally insulated to prevent the greenhouse from getting too cold during the night. A ground to air heat transfer (GAHT) system may be configured to produce a flow of greenhouse air under the greenhouse for heat transfer, to moderate the temperature of the greenhouse. A thermal medium may flow to a thermal reservoir for heat exchange with the conduits of the GAHT system.