J&B Greenhouses EndoGreen Report: 16.31% Total Savings in 12 Months

March 13th, 2019

Over the past 5 years EndoTherm has been installed into thousands of commercial and domestic systems worldwide. The application areas, however, are not restricted to these two systems. EndoTherm can also be installed into District Heating Systems, GSHP, Biomass, Solar Thermal. We have also had some great success in Poultry Farms and Greenhouses, with EndoGreen. Supplied by Pace49, this specialized formula of EndoTherm is available for greenhouse operations.

Greenhouses are a great application for EndoGreen. They cover a large geographical area and need a constant (and often sizeable) heating load to ensure optimal growth conditions for their crops. Greenhouses in Ontario may need to maintain conditions of 20°C (68°F) despite outside conditions being -30°C (-22°F).

The need for constant sunlight (often meaning less insulation is present than in commercial buildings) and heating, one of the largest expenditures for a greenhouse, are essential for optimal growth and therefore healthy profits.

The new owners of J&B Greenhouses began looking at ways to improve efficiencies related to running a year-round greenhouse in Southern Ontario, Canada as heating a poly greenhouse is a major variable expense. The greenhouse is a double layer, poly greenhouse approximately 56,000 sq.ft. in size. The heating system is fuelled by natural gas and features twin boilers that were installed in 2004 when the greenhouse was built. The heating system comprises of roughly 17km (3,280 feet) of piping which runs on exterior walls, under benches and upper heat pipes for hanging baskets.

As the boiler is now 15 years old, combined with all the thin pipe runs, the site often struggled to hit set points. The owners reported that their average temperature was often more than 1°C lower than the required temperature during the colder months.

Poor performance increases run times (as the system struggles to reach set points) and thus heating consumption. A greenhouse therefore will have an increased gas bill and growing conditions could worsen, which could ultimately impact crop and profits.

As a solution to both problems, the team at J&B Greenhouse installed EndoGreen, in March 2018. The performance of EndoGreen was calculated after 12 months (7 months of heating as the boiler is not on in the summer) to determine the success of the installation. Historical consumption for the past 2 years, since the new owners took over, was used to construct a baseline compensated against Heating Degree Days. The trendline for this historical period was used to predict consumption based on known HDD values. The difference between the predicted consumption and recorded data can be seen to be the energy reduction during that time period.

During the 7 months the recorded consumption from the sites ARGUS control system was compared with the predicted consumption (from the historical trendline using HDD to compensate). The 7 months showed a cumulative saving of 45,525m3.

Based on a unit price of $5.95/GJ the pilot saved CAD $10,087 in the first 12 months. The newly enforced carbon tax ($20/tonne so around $1/GJ) can show additional savings of CAD $1,695 giving a combined saved of CAD $11,782.

The installation also saved 85,200kg of CO2e which is equivalent to the emissions released by 18 medium sized family cars in a year.

The site was also able to consistently hit the set points set by the control system.

"Historically the temperature was staying around one degree lower than what the system called for at nights. Within two days after installing the EndoGreen we noticed that the temperature was reading within 0.1°C of the temperature requested for the heating system."

Steve Hoover & Patricia Weise Hoover - Owners J&B Greenhouses

Contact PACE to find out how you can reduce the natural gas bills in your greenhouse or building


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