Passive Solar Greenhouse
Sunlight obviously performs a critical role in plant growth. The passive solar greenhouse take the idea to a new level.
Passive Solar Greenhouse
Passive solar greenhouses are excellent choices when it comes to maintaining the agricultural principles of affordability and durability. They are also an efficient way to use local resources. In passive solar design the sun's energy is used for the heating and cooling of the gardening space. Passive greenhouse systems are simple. They do not require a lot of maintenance. They also are free of any mechanical systems or burdened by a lot of parts.
The two key elements in creating a passive solar greenhouse are south facing glass and thermal mass to absorb, store and distribute heat. The structure itself collects, stores and distributes solar energy. The structure will utilize up to 75% of the sun’s energy that strikes the windows. The passive solar greenhouse will be equipped with thermal mass walls and floors to absorb this energy. The thermal mass materials should not exceed 6 inches in thickness, and they should not be covered completely by planters or floor coverings.
Passive solar greenhouses are an effective solution for gardeners who deal with extreme temperatures or weather conditions. Conventional greenhouses tend to have a “fry or freeze” effect on plants when placed in inclement areas where growing seasons are short. The absorbed sunlight energy can be used even during cold, short days. The active venting and fan systems are powered by this absorbed energy, keeping the greenhouse cool and moist if needed. Most models of the passive greenhouse come with materials that will harvest and deliver water to the plants.
The building costs are slightly higher for a passive solar greenhouse than for a traditional unit. This is because the ground needs to be prepared and a foundation is laid. The foundation may cover the entire floor or it might just outline the perimeter, depending on the gardener’s goal. If only the perimeter is used, then the gardener can plant directly into the soil throughout the year, as this system keeps the ground from becoming frozen or parched.
Despite the higher costs of the initial build, the passive solar greenhouse will be less expensive to maintain. In addition, the year-round yield can keep fresh vegetables on the table. Unlike traditional greenhouses, the passive solar greenhouse does not come as a kit. It will require some carpentry skills and the ability to read a schematic. The builder/gardener will also need to research the codes of their location as well as whether they will need/want a full thermal floor.
