Otis Singleton
The cost of electricity is one of the most significant expenses in operating a greenhouse, especially in colder climates. While greenhouses naturally trap heat, they require supplemental heating during the colder months. Electric heaters are a popular choice for greenhouse heating, and their power is typically measured in watts or kilowatts. To save on electricity costs, some people opt for solar panels or natural gas furnaces. Additionally, proper insulation, ventilation, and direct sunlight exposure are essential for maintaining optimal temperatures in a greenhouse.
| Characteristics | Values |
|---|---|
| Electricity | Yes |
| Year of Construction | 1908 |
| Location | Pasadena, California |
| Architects | Charles and Henry Greene |
| Style | American Arts and Crafts |
| Ownership | City of Pasadena and University of Southern California |
| Status | National Historic Landmark |
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Solar PV panels
Solar panels are a renewable energy source, providing clean energy and reducing the user's carbon footprint. They can be installed on the greenhouse structure or nearby, providing there is good sun exposure. The sun's energy is converted into electricity by the panels, which can then be stored in batteries for use at night or during periods of low sunlight. This stored energy is then converted into AC electricity, which is used by appliances.
Solar panels can be used in conjunction with solar generators, which combine solar panel technology and battery storage. This combination ensures a reliable source of energy and is a popular choice for those wanting to maintain a specific temperature, light level, and humidity for plants. The use of solar panels can also reduce energy costs over time, despite the high upfront cost of installation.
The effectiveness of solar panels in a greenhouse setting is influenced by the local climate and the design of the structure. They work best in areas with lots of sun exposure and careful design and orientation can help to maximise sunlight absorption and heat retention. The use of solar panels can also be combined with passive solar heating, which uses the sun's heat to provide space heating.
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Electric heaters
One of the most common types of electric heaters for greenhouses is the electric fan heater. These heaters are affordable and can be placed in an open, central spot in the greenhouse, away from water. It is important to angle the heater so that the airflow is directed above the plants, as the warm air can desiccate the foliage.
To save money and energy, it is recommended to only heat the greenhouse when necessary. Using a heater with a built-in thermostat can help with this, as it will only turn on when the temperature drops below a certain point. Additionally, adding thermal mass to the greenhouse can improve heat retention and reduce heating costs.
Compared to other options, electric heaters are less cost-effective than oil heaters, which are more affordable to run and do not dry out the air. Kerosene heaters are also a good alternative for greenhouses without electricity. However, electric heaters are safer and easier to use than kerosene heaters.
Overall, electric heaters can be an efficient option for heating a greenhouse, especially with the use of a thermostat and proper placement. However, they may not be the most cost-effective option, and other alternatives such as oil or kerosene heaters may be more suitable in certain situations.
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Insulation
There are several eco-friendly insulation options available for green homes, each with its own advantages and disadvantages. Here are some of the most common types:
- Sheep's wool: This is a natural and fire-resistant option that can keep your home warm in the winter and cool in the summer. The compressed wool fibres form millions of tiny air pockets, making it an effective insulator. It is also moisture-absorbent and water-resistant.
- Cotton or recycled denim: Cotton is a natural, renewable, and safe alternative to traditional insulation. It is very good at absorbing moisture and is insect repellent. However, it can be more expensive than other options.
- Icynene: This is a spray-on foam insulation made from castor oil. It is extremely effective at sealing leaks and drafts, and it also muffles noise. Icynene has a high R-value, which can reduce energy bills significantly. However, due to its sealing properties, it requires the installation of a ventilation system, which can increase costs.
- Aerogel: Aerogel is a super-insulator that is 90% air. It has a high R-value and is an excellent barrier to heat transfer.
- Polystyrene: Polystyrene is a plastic that comes in two forms: rigid foam boards and spray foam. It is very effective at insulating and saving energy.
- Cellulose: Cellulose insulation is made from recycled newsprint and other paper products, making it an environmentally friendly option. It is safe to install and helps reduce landfill waste.
- Autoclaved concrete: Autoclaved concrete blocks have up to ten times the insulating value of conventional concrete. They are large, light, and easy to work with, but they require protection from moisture.
When choosing insulation for a green home, it is important to consider factors such as cost, effectiveness, environmental impact, and the specific needs of the home and its location.
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Natural gas
The burning of natural gas releases carbon dioxide and methane, which are greenhouse gases. Greenhouse gases have a warming effect on the Earth's surface, similar to the glass roof of a greenhouse. They absorb and trap the Sun's heat, preventing it from escaping into space. While greenhouse gases are essential for maintaining a suitable temperature for life on Earth, human activities, such as burning fossil fuels, have increased their concentration in the atmosphere.
In the context of electricity generation, natural gas is often compared to coal. In 2022, natural gas and coal accounted for 50% and 49% of electric power sector CO2 emissions, respectively. There have been hypotheses that increasing the export of liquefied natural gas (LNG) from the United States could have climate benefits by displacing coal for electricity generation. However, the climate benefits of replacing coal with natural gas are uncertain due to the variation in upstream emissions and the magnitude of emissions from the natural gas supply chain.
The focus on replacing coal with natural gas for electricity generation has been criticized as incomplete because the majority of gas is used in industry and building usage, rather than power generation. Nevertheless, the displacement of coal-fired power generation with natural gas has been a significant topic of discussion.
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$10.47
Renewable electricity
One way to generate renewable electricity for greenhouses is through solar power. Solar cells, or photovoltaic (PV) systems, convert sunlight into electric power. These can be designed with specific tint and transparency to let through the colours of light needed by plants, while using other wavelengths to generate electricity. This technology is still in the prototype phase but shows promise for future use in greenhouses.
Biomass is another renewable energy source that can be used to generate electricity. Biomass is developed from organic materials, including agricultural and forestry residues, industrial wastes, and crops grown for energy purposes. Biomass boilers and furnaces provide heat and can be customized to the grower's needs.
Additionally, the use of renewable electricity in greenhouses can be optimized through smart design and energy-efficient technology. Well-designed, highly insulated greenhouses that utilize technology requiring minimal power can significantly reduce energy consumption and costs. For example, electric air heaters with built-in thermostats can efficiently heat the air in vented greenhouses without needing an external controller.
By combining renewable energy sources with efficient design and technology, greenhouses can reduce their environmental footprint and improve their business stability and long-term viability.
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Frequently asked questions
Greenhouses can generate electricity through solar PV panels, which turn solar radiation into electricity. However, this method is only about 20% efficient due to the silicon used in PV systems. Alternatively, they can use electric heaters, electric furnaces, or electric air heaters.
To calculate the cost of electricity for your greenhouse heater, you need to consider the wattage of the heater and the cost you pay per kilowatt-hour for electricity. You can then calculate the maximum cost to run the heater per hour or per day.
To heat a greenhouse without electricity, you can use transparent materials like glass, plastic, or even bubble wrap on the sidewalls and roof to trap heat from the sun. You can also insulate the north side of the greenhouse with a solid wall if you live in a northern climate. Additionally, building a below-ground greenhouse can provide more consistent heat, and installing a humidifier can increase humidity and provide ample heat without electricity.
Electricity in a greenhouse allows for climate control, providing heat during colder months and ventilation during warmer months. It can also power devices such as fans, cameras, and electronic controllers that monitor and adjust temperature and ventilation.
One consideration is the cost of electricity, especially for heating, which can be significant. It is important to design the greenhouse well and ensure it is properly insulated to minimize heat loss. Additionally, choosing the correct wattage and placement of heaters is crucial to efficiently heat the space.
