SOLAR PROJECTS

Be inspired by our sustainable solar energy projects based on state-of-the-art technology for the production of hot water, heat, hot air and electricity. These are just a few examples, contact us for more information about our small and large scale projects.
ROTORUA DAIRY FARM
Significant cost savings

 

The dairy farm from Deverel and Joy in Rotorua has a typical NZ milking shed where 350 cows are milked twice a day. To reduce the energy bill for producing hot water, a solar system with 16m2 was installed that saved 56% on the energy needs for hot water production.

CHEVIOT SCHOOL POOL
Unique large solar collectors 

 

Cheviot Area School was looking for an effective way to heat their swimming pool to extend the swimming season over the year. EWA-TEC was invited to explain the different solar solutions and concepts. Cheviot chose advanced large flat plate collectors, which was the first major implementation of a solar hot water system of this kind and of this size in New Zealand. Six large solar collectors each 8.4 m2 were installed and connected to the pool water. Monitoring shows that while the swimming pool water normally has  a temperature of around 18° C in March, the water temperature has risen to over 23° C with the solar heating, and people are still enjoying swimming at this time of the year.

WATERPROOF INSTALLATION IN TAUPO
Advanced flat plate solar collectors

 

The Brandon family from Taupo were very happy with the professional way in which engineer Steve organised the waterproof integration of 4 large solar collectors. The solar collectors, each 5.5 m2, were lifted by a crane and then hooked up to a smart combination of space heating, swimming pool heating and hot water production. This combination meant that installation time, copper works and labour cost for this large solar system were reduced, which demonstrates clearly the advantage of large flat plate collectors. These collectors with tempered solar glass not only increase the solar performance but are strong and are built to last for ever.

 

FLOOR AND SWIMMING POOL HEATING ON WAIHEKE

Home savings on electricity bill

 

In his beautiful house on Waiheke Island, Mike Robertson and his family are using two heat pumps to heat a 200 m2 concrete floor and a 50 m2 swimming pool. Although heat pumps can save a lot of electricity during most months of the year, Mike decided to take a better look at solar energy to save more on his electricity bill. Four years ago we installed a 16 m2 solar collector and a specially designed solar cylinder that is feeding both the floor and the swimming pool system. This cost-effective solar system runs all year long and is protected against freezing and overheating with the unique integrated drain back system.

RAROTONGA RESORT CENTRE
Huge electricity savings on hot water bill

 

The sun shines a lot on the cook island of Rarotonga. Many houses have a thermo-siphoning solar system on the roof but unfortunately these systems are low performing or failing within a short lifespan. Our European state-of-the-art systems is ideally suited for the hot climate conditions and weather type of Rarotonga. Rick Mc Millen is developing this new resort on a magnificnet spot of the island. After following one of our workshops he decided that price and performance were ideal for his plans . We commissioned the first out of 4 solar houses and trained the local plumber Tom to install more systems later. These closed loop drain back systems will run all year long and overheating in extreme sunny conditions is 100% taken care off. The back-up with electric element will hardly be needed because of the many solar hours per year. Energy savings will be monitored and financially compared with the normal high electricity prices.

Tuhoe event Centre

The new event centre at Tuhoe is one of the largest living buildings of New Zealand.

To cover electricity needs a large solar power system was installed that covers the whole roof. The hot water for kitchen, shower and dishwasher use is produced by a closed loop drain back system with 16 m2 solar collector and a 1,000 Liter solar cylinder. Because burning of fossil fuels was not allowed, the solar cylinder is designed with integrated electric elements that cover back-up, mostly only in winter months.

Pegasus school Christchurch

When the school decided to build 3 new buildings in a sustainable way, the Board also decided to install a large solar power system and 5 solar hot water systems. The 5 residential hot water systems produce hot water for a laboratory, toilet and kitchen. Orientation of the solar collectors is different on the 3 buildings and this proofs again that due North orientation is not fundamental anymore. State-of-the art solar collectors still produce a lot of hot water between NE and NW.

Residential architect Bryan Pooley-Auckland

Architect Bryan in Three Kings area knows how to build very energy efficient buildings. The main building is not only designed to capture passive solar energy for heating, but the roof is also covered with a solar power system that delivers electricity to the grid. The solar hot water system is designed for a 4 persons family and is beautifully integrated next to the solar power panels. In this way the aesthetic view of the roof is kept nice.

Positive Energy house Kaiwaka- Eric Jansseune director ewatec-global

When we built this house in 2008, we decided to design a very energy efficient Positive Energy house that produces 3 times more energy than needed. The combination of solar power to the grid, and a 4 persons hot water system produces thus 3 times more kWhours than needed when fully occupied with 3 persons. The solar panels are laminated and glued on the special metal roof. The solar hot water produces "too" much hot water and covers more than 8 months free hot water for kitchen, shower and washing machine.

Port of Auckland

Port of Auckland (POAL) decided in 2017 to install a solar power system on the Rail Office to compensate the yearly electricity needs. This solar power system produces more than 4,000 kWh back to the grid , generated locally by the energy system of POAL wharf.

© 2018 by EWA-TEC Ltd. 

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