The main shared kitchen, dining room and ablutions block at Lakeview Holiday Park, Wanaka was ageing and inefficient. Park Managers, Aggi and Rudi Sanders wanted a new building that would deliver on comfort, beauty and sustainability for the thousands of visitors who use the park every year. A replacement building was designed for good passive solar gain, superior insulation and maximised renewable energy contribution.
With the original building using an LPG system, hot water consumption was the biggest energy user of the building. The Sanders looked for alternatives to minimise the building's running costs and environmental impact. In order to ensure 100% reliable hot water for campground guests, the chosen system would need to adapt to enormous seasonal fluctuations in hot water demand, with peak hot-water demand in summer of up to 12,000L per day, and be able to keep up with growing guest numbers in future — all while coping with extreme Central Otago temperatures.
Contractor Mike May of Mike May Plumbing says, “The owners had run camping grounds for many years and had a clear wish list of what they wanted, including a very energy efficient building, and we made that happen as best we could.” Mike contacted Apricus to see if they could help with a solar hot water system design and product supply for the building.
Apricus undertook site-specific water demand prediction and analysis in order to create a detailed solar hot water system design, including integration with the conventional hot water system and gas boiler for space heating. The system utilises nineteen Apricus ETC 30 evacuated tube collectors, plumbed in an innovative drain-back configuration to handle the extreme cold temperatures of Central Otago winters.
The collectors are installed at 20° pitch to blend with the building roof line and to optimise summer performance for peak occupancy. The Apricus collectors heat 3,850L of dedicated solar water storage. These supply solar heated water to a 1,700L gas reheat cylinder with four Rinnai water heaters.
In the first year of operation, the Apricus solar hot water system has delivered 47MWh of hot water to the campground's 27 showers, 42 hand basins, eight kitchen sinks and four laundry units, eliminating over 10,000kg of CO2 emissions from the Holiday Park’s operation. Multiplied over the 20-year plus lifespan of the solar system, there is a very important sustainability benefit from the installation.
Manager of Lakeview Holiday Park, Aggi Sanders says, “It’s great. I’ve had my first gas bill to compare with last year and it almost went down by half and we were a lot busier this year than last year."
When considering sustainable water heating for upcoming projects, contact Apricus to discuss project requirements, and discover the most effective hot water heating solution.