Solar Supported Greenhouse Heating and Air Conditioning

Solar Supported Greenhouse Heating and Air Conditioning

Greenhouse Heating and Air Conditioning Systems

The greenhouse heating and air conditioning system plays a crucial role in plant health and crop production. Many novice greenhouse growers do not attribute slow growth, low yields, or problems with pathogens to an inadequate greenhouse air-conditioning system. Most greenhouse manufacturers understand the importance of air-conditioning systems for temperature control, but the benefits from air-conditioning systems are manifold. Air-conditioning systems are not only vital for maintaining environmental conditions, but also directly affect a plant's ability to perform photosynthesis, uptake essential elements, and complete their reproductive cycles (pollination). Greenhouse ventilation systems serve four essential functions: temperature control, humidity control, CO2 /oxygen exchange and air circulation.

Temperature control:

Greenhouses increase the temperature in the environment by trapping the solar radiation (greenhouse effect). If this heat is not removed from the environment, it can cause undesirable or worse conditions for plant growth. Ventilation systems, whether natural (passive) or mechanical (powered), serve the primary function of removing excess heat.

Humidity control:

Like heat, high humidity concentrations can become trapped in a greenhouse's environment. Although some plant varieties thrive in high humidity conditions, most plants are inhibited by pathogens associated with high humidity levels. Almost any mold, fungus, and mildew thrive in conditions of high humidity. Plants emit moisture that, if not removed, can accumulate in a greenhouse and raise humidity levels. It is also very common for the environment inside a greenhouse to be affected by the dew point causing condensation and excessive humidity.

CO2 / Oxygen Exchange:

Just as humans will run out of oxygen in a poorly ventilated and confined space, plants "breathe" CO2 which must be replenished in any greenhouse that does not support it artificially. Fresh air drawn into a greenhouse carries with it two important gases that plants need to perform some of their most basic functions. Plants use CO2 directly from the air during photosynthesis. When CO2 levels decrease the rate of photosynthesis, and all other plant functions associated with photosynthesis decrease accordingly. Ensuring adequate fresh air intake ensures adequate CO2 levels for plant growth.
We all know that plants breathe CO2 and expel oxygen, but many people don't know that plants absorb oxygen in gaseous form. Although plants create their own oxygen, they benefit from the regeneration of oxygen in the fresh air. Oxygen is necessary for the continued growth of roots and is therefore directly linked to the plant's ability to take up nutrients.

Air circulation:

Air circulation or air movement inside a greenhouse serves many purposes. Proper air circulation creates uniformity in temperature, humidity, CO2 and oxygen in the environment. Plants respond better to environmental consistency and proper air circulation ensures that every plant in the greenhouse receives the same atmospheric conditions. Air movement is also our way of simulating wind in an enclosed environment. Wind strengthens the cell walls of a plant's stem and directly affects the architectural integrity of plant growth. For many plants, wind (or its simulation) serves an even more integral purpose: pollination. Many vegetables and ornamental plants are pollinated by the wind. Air movement inside a greenhouse can be the factor that determines whether a plant is pollinating and completing its reproductive cycle.

Sizing and Fan Layout for Mechanical Ventilation Systems

Before sizing the mechanical equipment for a greenhouse, it must be decided whether the greenhouse will be used seasonally or year-round. There is a big difference in temperature and humidity from summer to winter and this affects the indoor environment of a greenhouse. If you plan to use a greenhouse year-round, it's best to size your equipment for the hotter summer months, which require more aggressive ventilation. Be sure to purchase equipment that includes thermostatically controlled or variable speed fans so that it can be used year-round when less intense ventilation is needed.

With the SolarBox technology developed as a result of Enge Energy's engineering studies, it can be used for space heating and fresh air circulation purposes, as well as a very efficient and effective method for greenhouse air conditioning.

While SolarBox saves up to 80% in energy, it also helps to maintain the ecological balance by reducing the emission of greenhouse gases to nature.

SolarBox systems reach a maximum efficiency level of approximately 60-80% in greenhouse heating applications, depending on the location and area. The most important benefit is that a wide range of airflow rates with high performance is achieved.

While many similar products and systems experience loss of performance in airflows, our SolarBox products maintain a high level of efficiency even at low airflows.

Aqueous radiant ceiling systems used in water radiant heating are installed with the engineering experience of Enge Energy.

Aqueous radiant ceiling panels offer different design possibilities with the help of their modular construction, and with this feature, they become ideal for all kinds of greenhouse heating applications in terms of energy savings.

You can view the products of Greenhouse Heating with New Technologies produced by Enge Energy on GREENHOUSE HEATING WITH NEW TECHNOLOGIES page.

You can also check our products here.

Source:
Greenhouse Air Conditioning