In the video “Passive Solar Greenhouses – 8 Key Considerations When Building” by Baltic Homesteaders, you will gain valuable insights into the key concepts and components necessary for constructing an effective passive solar greenhouse. The video explores topics such as greenhouse positioning, suitable glazing materials, insulation options, the importance of a mass or heatsink, ventilation techniques, soil and growing beds, and the benefits of automation. Throughout the video, the hosts, Gita and her partner, provide a comprehensive overview while sharing their own experience living on a family homestead in Latvia. Be sure to watch until the end for a summary of important considerations and to explore other informative videos on their channel.
Welcome back, friends! In this video, “Passive Solar Greenhouses – 8 Key Considerations When Building” by Baltic Homesteaders, we continue our exploration of creating an excellent passive solar greenhouse. By utilizing a 3D model of their garden, Gita and her partner reveal their design and discuss the various components needed for an effective greenhouse. From positioning and glazing materials to insulation options and automation, they offer practical advice based on their own experience. Whether you are a beginner or an experienced gardener, this video provides valuable insights into building your own passive solar greenhouse. So sit back, relax, and get ready to learn something new.
Passive Solar Greenhouses – 8 Key Considerations When Building
Positioning
The positioning of any passive solar greenhouse is crucial to ensuring its effectiveness. There are two considerations when it comes to positioning: the physical location and the rotational placement or orientation.
For the physical location, you need to determine where you will place your greenhouse. Will it be adjacent to your house or in a standalone location? If you choose a standalone location, you need to consider the availability of services such as electricity and water. It’s essential to have access to these services to ensure the efficient functioning of your greenhouse.
The rotational placement or orientation of the greenhouse is also important. While it’s commonly believed that the greenhouse should face due south, it’s actually more beneficial to have a slight deviation from true south. This allows for better utilization of the morning sun, which is the coolest time of the day. By cutting out some of the later day sun, you can help cool down the greenhouse more effectively.
Glazing Materials
When it comes to choosing the glazing material for your greenhouse, you have two main options: glass or polycarbonate. While polythene is also an option, it is not suitable for retaining heat, making it less ideal for a passive solar greenhouse.
So why should you choose polycarbonate over glass? Firstly, polycarbonate is significantly lighter and easier to handle than glass. This makes it easier to install and maintain. Additionally, polycarbonate is much more difficult to break than glass, making it a safer option.
One of the key benefits of polycarbonate is its ability to diffuse light. This means that no matter what direction the light hits the glazing, it will be evenly distributed into the greenhouse. This makes the angle of the glazing less important, as the light will still be able to reach all areas of the greenhouse. However, it’s still important to consider snow shedding when designing your greenhouse.
Construction Materials
The choice of construction materials for your greenhouse will largely depend on your budget considerations. For the framing of the greenhouse, wood is often a popular choice. Wood is readily available and relatively affordable. Additionally, wood provides good insulation properties, helping to retain heat within the greenhouse.
For the sides and back of the greenhouse, moisture-proofed OSB (oriented strand board) is a suitable option. OSB is a cost-effective material that is resistant to moisture, ensuring the longevity of your greenhouse.
Ultimately, the choice of construction materials will depend on the specific requirements and budget constraints of your project.
Insulation Options
Insulation is a crucial component of a passive solar greenhouse, as it helps to regulate temperature and prevent heat loss. There are several options for insulation, including blanket roll insulation, foam board panels, and natural fibers such as hemp wool or straw.
Blanket roll insulation is made from materials such as fiberglass or mineral wool. While it can be cumbersome to work with, it provides effective insulation properties. Another option is foam board panels, which are made from various materials such as extruded or expanded polystyrene. These panels are easier to work with and provide good insulation.
Natural fibers such as hemp wool or straw can also be used as insulation materials. These materials are often recycled and can be found in the form of rolls or panels. Natural fiber insulation is a more sustainable option and provides excellent thermal properties.
The choice of insulation will depend on factors such as cost, availability, and your specific requirements for temperature regulation.
Mass or Heatsink
The mass or heatsink in a passive solar greenhouse is responsible for absorbing heat during the day and releasing it at night. Water is considered the most efficient material for this purpose, as it has a high heat storage capacity. However, in areas with low temperatures, water can freeze and cause damage to the greenhouse structure.
In such cases, solid materials can be used as a substitute. Stone, for example, can be sourced from old barns or outhouses that are unlikely to be rebuilt. These materials provide a large mass that can absorb heat during the day and release it at night, effectively regulating the temperature within the greenhouse.
Ventilation
Proper ventilation is crucial for cooling the greenhouse and maintaining optimal growing conditions. There are several methods of ventilation that can be employed in a passive solar greenhouse.
Windows are an essential component of ventilation, allowing for natural airflow. Placing windows on the lower front side of the greenhouse enables cool air to enter and hot air to escape. This natural airflow helps to regulate the temperature inside the greenhouse.
In addition to windows, fans powered by solar energy can be installed to exhaust hot air out of the greenhouse. These fans can be controlled by a thermostat to activate when the temperature reaches a certain threshold. Solar-powered ventilation ensures energy efficiency and optimal cooling during the hottest days.
Soil and Growing Beds
Good soil quality is essential for successful vegetable growth in a passive solar greenhouse. Native soil can be improved by adding various substrates and amendments.
A layer of biochar, a highly porous form of charcoal, can be dug into the native soil. Biochar helps retain moisture and provides a habitat for beneficial microbes. Additionally, a layer of high-quality compost, possibly sourced from chicken compost or cow manure, can be added to further enhance fertility.
When planting, a mixture of good quality compost and native soil amended with slow-release organic fertilizers such as fish meal can be used. This ensures that the soil has the necessary nutrients for optimal plant growth.
Automation
Automation can greatly enhance the functionality of a passive solar greenhouse. By automating ventilation and watering systems, you can reduce your workload and improve plant health and productivity.
Automated ventilation allows for precise control of airflow, ensuring optimal temperature and humidity levels. Sensors can be used to monitor soil moisture levels and activate a watering system when needed. Drip irrigation systems can also be incorporated to conserve water and prevent overwatering.
By automating these key aspects of greenhouse management, you can create an environment that promotes plant growth and minimizes the risk of human error.
Summary of Considerations
When building a passive solar greenhouse, there are several important considerations to keep in mind:
- Positioning: Ensure maximum sunlight by facing the sun.
- Glazing Materials: Consider the benefits of polycarbonate, such as its lightweight and light diffusion properties.
- Construction Materials: Choose suitable materials based on budget and moisture-proofing requirements.
- Insulation Options: Consider blanket roll insulation, foam board panels, or natural fibers for effective insulation.
- Mass or Heatsink: Use water or solid materials as a heatsink to regulate temperature.
- Ventilation: Optimize airflow with windows and solar-powered fans for cooling.
- Soil and Growing Beds: Focus on good soil quality and nutrient-rich growing beds.
- Automation: Implement systems for automated ventilation and watering to reduce workload and improve plant health.
By considering these factors and implementing them effectively, you can create a passive solar greenhouse that provides optimal growing conditions and maximizes plant productivity.
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