Optimizing Greenhouse Temperatures

In certain climates, greenhouses may require cooling solutions to maintain optimal conditions for crop growth. When average daily temperatures exceed the ideal range for plant health, cooling becomes essential to ensure productivity and prevent heat stress. Cooling systems often require significant investment, making it crucial to carefully evaluate the need for and type of cooling system.

Active Cooling Solutions

Active cooling, also known as mechanical cooling, involves lowering the temperature inside greenhouses using energy-powered systems like refrigerant compressors, absorbers, or desiccant dryers. Unlike evaporative methods, mechanical cooling directly conditions the air, providing precise control over greenhouse temperatures.

Advanced Chillers for Efficient Cooling

In projects that need mechanical cooling, VB implements advanced screw chillers that generate cold water at approximately 6°C. These chillers are strategically placed outside the greenhouse, forming a closed-loop system that efficiently provides cooling. Utilizing water as the cooling medium is preferred in horticulture, as it offers a sustainable and effective alternative to synthetic refrigerants.

Harnessing Condensation Water

As the cold water circulates through heat exchangers, the temperature drops below the dew point, causing condensation. This process converts water vapor into liquid form, reducing humidity levels within the greenhouse. The collected condensation water can be repurposed in irrigation, making the system not only water-neutral but also a source of reusable water.

Centralized vs. De-centralized Cooling

There are two primary strategies for applying mechanical cooling within a greenhouse: centralized and de-centralized. In a centralized system, cold air is conditioned in a separate chamber, then distributed via ducts beneath the crops or through overhead channels. This approach is often used in semi-closed greenhouse setups.

De-centralized cooling focuses on cooling directly within the cultivation area. Air handling units or specialized equipment like HortiCoolers can condition the air where it’s needed most, ensuring a consistent climate across the entire greenhouse. When executed effectively, this method leads to a more balanced and uniform environment for the crops.

Contact us

Looking for a company specialized in greenhouse construction and integrated systems that can help you realize your project? Get in touch with VB today. Our team combines technical expertise with international project experience to deliver turnkey solutions for growers and investors in the USA.