WHERE TO START SAVING ELECTRICITY ABOUT 40% OF HOUSHOLD ELECTRICITY IS USED HEATING WATER

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1 WHERE TO START SAVING ELECTRICITY ABOUT 40% OF HOUSHOLD ELECTRICITY IS USED HEATING WATER

2 CONVENTIONAL HOT WATER GEYSERS A conventional Hot Water Geyser is cheap to purchase compared to a solar system Most homes already have a conventional geyser installed The payback periods on for removing an existing geyser and replacing it with a solar system is too long A geyser should be placed as close as possible to where the bulk of the water is to be used

3 SOLAR OPTIONS: DIRECT OR INDIRECT? INDIRECT SYSTEM Two bodies of water. The water heated by the Solar Panel flows to a heat exchanger in the geyser, heats the water in the tank and is returned to the Solar Panel to be heated again in a closed system. DIRECT SYSTEM Water flows into the system is heated and flows out to the point of use.

4 THERMOSYPHON SYSTEMS Cheapest Simplest Most Common

5 PUMPED SYSTEMS More Expensive Much Neater More efficient

6 DIRECT SYSTEMS DO NOT WORK IN NAMIBIA Hard water with a high mineral content causes the plumbing and particularly flat plat accumulators to become blocked by mineral build up.

7 HEAT LOSS ON COMBINATION SYSTEMS Heat transfer is inversely proportional to in temperature between the two bodies Heat loss inside a roof considerably less than for a tank on the roof Pipe distance from the tank to the tap greater on a combination system Inside roof temperature losses

8 EARLY ELEMENT FAILURE If there is no water in the geyser then the element continues to heat up until it burns out Mineral build-up on the element reduces efficiency and causes surface temperatures to go too high and the element burns out

9 PRODUCTS ON OFFER GeyserWise TSE GeyserWise MAX

10 GEYSERWISE MAX Control box The control unit is the brain of the system. It performs all the programmed functions and sends instructions to the pump and the element. Use as a geyser timer Use as timer on a thermosyphon solar system Use as timer and differential control on pumped solar system Display unit An array of useful information can be displayed. This includes the temperature of the water in the geyser, the temperature in the collector, whether the pump is running or not, when the element is on, actual kw used, etc. Water geyser sensor The water geyser sensor measures the temperature in the geyser and acts as a thermostat.

11 GEYSERWISE TSE TSE Display Note the small control box compared to MAX. Use as a geyser timer Use as timer on a thermosyphon solar system GeyserWise thermal cut-out sold with the unit.

12 MEGA WATT SAVER HEATING ELEMENT DC 230V AC Titanium Tube with PTC Element Threaded Boss

13 MEGA WATT SAVER HEATING ELEMENT DIFFERENT PRODUCT VARIATIONS AVAILABLE Black wire+ red wire is 230V, blue wire + white wire is 24V or 48V. φ3 5 ± ±2 or 425±2 300± W, 2200W and 3000W variations available Available in two DC ranges V and 48 72V AC 230V Flanges and Adapter kits available for most brands of geyser

14 WHY TITANIUM Titanium doesn t allow scale to harbour onto the surface. Titanium naturally produces a dioxide film that continually migrates to the surface, and detaches harmful content. Additionally, titanium s surface pores do not open when heated, and will not allow harmful chemicals or particles to collect. Titanium contains no iron, & therefore cannot rust or corrode Titanium can resist pitting, oxidizing, and surface breakdown up to 10 times better than typical nickel alloy elements Exceptionally low thermal expansion rate, and this will reduce the stress that can cause structural fatigue and fracture. Energy cost savings of at least 6% can be added to the known lifetime benefits of titanium sheathed water heating elements and that the use of titanium represents a reliable and cost effective solution for hard and aggressive water applications.

15 PTC TECHNOLOGY FOR HEATING Positive Temperature Coefficient Series of Barium Titanate semiconductor chips Non-linear resistance so as temperature increases so does the resistance. Designed temperature limit that it cannot burn out if geyser is drained Good heat transfer rates

16 SOLAR PV HYBRID SYSTEM Basic Layout Keep existing hot water cylinder and plumbing Easy Installation No freezing

17 SOLAR PV HYBRID SYSTEM Requirements Megawatt Saver Heating Element Geyserwise Dual Controller or Geyserwise MPPT Controller PV Panels

18 CONNECTION DIAGRAM DUAL CONTROLLER

19 CONNECTION DIAGRAM MPPT CONTROLLER

20 AVERAGE MONTHLY RADIATION LEVELS Cape Town 19 Year Average Windhoek

21 CASE STUDY: Cape Town, Cloudy day, January PTC Solar Pumped System

22 CASE STUDY: August PTC vs Pumped PTC Element Pumped System

23 CASE STUDY: August PTC vs Thermo Syphon PTC Element Thermo Siphon

24 FOR INTEREST: 110Volt Element PTC 110 V DC element with 4 panels Green line is light intensity

25 SUMMARY Water Heating is the single largest user of electricity in the home. Using a GEYSERWise Controller to regulate the temperature and for switching the geyser off when not normally in use will give some saving. The titanium Mega Watt Saver Heating element with PTC element will last longer and give about a further 5% electricity saving. The biggest energy saving will be realised by the use of the Solar PV Hybrid system The Solar PV Hybrid system is cheaper to install and more efficient than conventional pumped or thermo syphon systems PV is more efficient on cloudy days Payback time on your investment is quicker