Problem 1: Lost Heat
Problem 2: Finding the Ideal Temperature
Solution: Runkle and Both recommend managing greenhouse temperatures based on specific crops and their finish dates. When greenhouses get too cold, plants will stop developing. However, overheating can lead to wasted energy. So how do you find the sweet spot (or optimum temperature) where plants will grow as fast as they can?
Researchers from Michigan State, the University of Florida and the University of Minnesota have developed a tool to help growers determine just that. The Computer Decision-Support Tool for Floriculture Crop Producers allows growers to select a specific crop and finish time at a particular temperature based on past experience, starting plant size and finished crop specifications. Then, the tool predicts the effect of increasing or decreasing temperatures in 2° F intervals.
You can also use the USDA Virtual Grower tool to predict the cost of greenhouse heating and help make decisions on temperature set points. This tool is also able to predict how much energy is needed to maintain specific temperatures at various times throughout the year.
Problem 3: Inefficient Heating Systems
Solution: To get the most out of your heating system, you must perform regular maintenance. Flush boilers to remove scale and deposits, and check the burner combustion efficiency of unit heaters and boilers with a flue gas analysis kit. It also helps to clean heat exchangers with a wire brush and vacuum. Be sure to repair or replace any malfunctioning steam traps, and check insulation on outside pipes. Finally, clean fan blades and check jet tubes for leaks.
If your heating system is still inefficient after a thorough tune-up, it might be worth considering an upgrade. Some of the newer, condensing boilers, for example, are highly efficient. The Infinite Energy 2 condensing boiler from Delta T Solutions offers up to 98% efficiency.
You might also consider investing in radiant bench or floor heat, such as the DELTA-TUBE™ EPDM SD rubber tube bench and DELTA-TUBE™ EPDM LD rubber tube ground heating systems. These systems heat starting at the soil level, allowing for faster germination and quicker turns. In addition, less heat is lost in the air compared to forced-air heating units, resulting in more energy dollars saved.
To learn more about hydronic heating:
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