Greenhouses temperatures can be controlled by means of evaporative cooling, also referred to as swamp cooling or adiabatic cooling. Enerdes supplies cooling pads, which will allow for very effective cooling of the air. Greenhouse cooling systems based on cooling pads and fans are the most efficient way to cool a greenhouse. Enerdes can determine for you what size cooling pads you require in order to obtain the perfect growing climate for your crops. Feel free to contact us for an offer on a suitable cooling system for your greenhouse.
To cool a greenhouse, the first measures are ventilation and shading. Ventilation can be achieved by creating air circulation with greenhouse fans and opening roof vents and shutter vents. These solutions may not be sufficient or not desired for many reasons such as:
For big buildings like offices, mechanical refrigeration can be used, also referred to as air conditioning. However, the amount of heat that needs to be removed from greenhouses is so much bigger, air conditioning with mechanical refrigeration is not economically feasible option.
At Enerdes, we know exactly how to develop a greenhouse cooling systems that operates with minimal energy consumption and low costs. First, we determine the cooling capacity required for your crops. How much heat must be removed from your greenhouse in how much time? For this, the following information is obtained:
Commercial greenhouses or industrial greenhouses usually have a big surface area. This means many vents, fans and additional cooling systems are used to provide cooling. It is an incredible amount of work to operate all these units manually. Enerdes can supply a fully integrated greenhouse climate control system as well as separate components. We can also provide the control technology for all separate components and systems that will allow you to monitor and control the climate in your greenhouse.
Having difficulties getting your greenhouse at the right temperature while maintaining proper humidity levels? Enerdes has decades of experience with greenhouse heating, cooling and climate control. We are part of Reinders Corporation, which has been making climate control systems since 1910!
In warm climates or during summer periods, venting your greenhouse may not be enough to cool your greenhouse. At Enerdes we make energy efficient greenhouse cooling systems for commercial and industrial greenhouses. Our greenhouse cooling systems will make sure your crops can grow in their optimal temperature and humidity.
When water evaporates in the air, energy is needed. This energy comes from heat which is dissipated from the hot air. The more water can evaporate in the air, the more heat is dissipated and thus the more the greenhouse is cooled. The initial temperature and the initial relative humidity of the air determine how much water can be evaporated and thus what the cooling capacity is and how much the greenhouse temperature can drop.
Evaporative cooling is especially effective in dryer climates, but can also be applied in other climates. We can compute exactly what the cooling efficiency is and how much cooling you will need, based on our thermodynamic knowledge and Computational Fluid Dynamics modelling (CFD).
Two types of greenhouse cooling systems are available of which the working principles are based on evaporative cooling. The fan and pad cooling system and the fogging system or misting system. A big advantage of an evaporative cooler is that it operates without the use of CFC’s or HCFC’s, like air conditioning systems do. Also, compared to conventional air conditioning systems, evaporative coolers for greenhouses require about 70% less costs to operate.
A fogging system may also be referred to a as a misting system or a spraying system. Humidity and its control is of great importance for a good greenhouse climate. By humidifying the air in the greenhouse, also called fogging, evaporation takes place and cools the air. This affects the humidity and ambient temperature.
As fogging allows for cooling the air, the air windows can be opened partially. This allows the CO2 level in your greenhouse to remain higher.
The evaporation of a crop requires energy. This energy is withdrawn from the greenhouse air. The energy in the form of heat is converted into water vapor. The energy is still there, but does not feel as heat. The crop can be helped in the conversion of sensible heat to water vapor using fogging. This is also known as adiabatic cooling.
By using a fogging installation the crop is helped with cooling. Therefore, less energy needs to be extracted from the greenhouse air. Adiabatic cooling is extremely energy efficient. The air in the greenhouse is cooled down by the evaporation of water. The lower the relative humidity, the higher the efficiency of the cooling process.
Enerdes fogging systems consist of high-pressurized lines hung at the top of the greenhouse. The stainless steel high-pressure line has a branch every 2 to 3 meters with a special high pressure nozzle which will atomize the water to a very fine mist. Our systems of Enerdes are custom made and thus tailored to your requirements. Two systems are available:
Under certain circumstances, the recirculation of air in the greenhouse is not enough to create a perfect climate for the crop. In this case, air from outside is required. When outside air is drawn in, the use of cooling pads is the most efficient way to cool the greenhouse.
By using Cooling pads, the ambient temperature can be significantly lowered. The quantity and size of the cooling pads that you will need, depend on many factors. The optimal growing temperature, outdoor climate, the kind of crop and environmental conditions are important factors to take into account.
Above the cooling pads is a water supply to distribute water onto the pads. On top of the cooling pad is a glued distribution pad which spreads the water evenly across the pad. In that way, the cooling pad is evenly moistened. Water drips down through the honeycomb structure of the cooling pads. The hot outside air flows through the cooling pads and is cooled down by the wet surface, hereafter the cooled air enters the greenhouse. Under the cooling pads is a drain which collects the water and makes it suitable for re-use. A wet wall greenhouse is created, but no water is wasted in Enerdes climate systems!
Enerdes has found a solution to increase the firmness of cooling pads and thus to extend the life. The special cooling pads are fitted with frames. By this development, the cooling pads stay in place better and are less sensitive to external influences and construction. This makes them universally applicable. Both the cooling pads and the frames are custom-made and are therefore available in different sizes. The cooling pads of Enerdes make the greenhouse climate suitable for your plants, even in the hottest months. The pads are not harmful to the environment and require minimum maintenance.
The cooling pads with frames are sold separately for existing greenhouses, but also with water distribution units:
There are several factors that affect the lifetime of cooling pads, including water treatment (pH and EC value), wind influences, the cleaning cycle, drying after use and intensity of use. Also the way of construction the cooling pads is of great influence. Cooling pads can warp by these influences or fall out of the wall. Enerdes cooling pads are constructed for long product life time and we can advise you on how to sufficiently cool your greenhouse, while maintaining your cooling pads in a good condition.
Example of wrong constructed cooling pads:
Enerdes is also the exclusive supplier of greenhouse fans that are suitable for