Saturday, May 21, 2011


Although Heat pumps are new to the South African market, it is a technology tested and used around the world to assist in the reduction of electricity usage and in this way reducing the amount of green house gasses being emitted into the atmosphere through the production of electricity using fossil fuels.

As part of Eskom’s Integrated Demand Management programme, they continuously look at ways to advise consumers, and set an example to contribute to the reduction of energy usage in South Africa. Three industrial heat pumps, supplied by Tasol, 2 x 9.2kW (input) and 1 x 4.6kW (input), were recently installed at the Eskom site in Germiston. The hot water reticulation network is supplied by 2 x 2000 litre tanks with 24kW of heating capacity each and 1 x 2500 litre tank with 24kW heating capacity. The installation of the heat pump units were combined with the replacement of two hot water cylinders. Air source heat pumps work on the reverse refrigeration cycle principle.

The thermal heating capacity is typically achieved in a ratio of 1 to 4 i.e. for each 1kW (electrical energy from the Eskom grid), 4 kW of thermal energy is generated. This ultimately results in a reduction of energy consumption as well as a demand reduction on the Eskom grid network. Mr.Hannes van der Merwe from Eskom says that electricalsavings were seen with immediate effect since the installation of the Tasol heat pumps. Typically, the demand profile is reduced from 48kW to less than 15kW. The expected energy savings are currently being measured and verified, but all indications are that acceptable savings will be achieved.

“Heat pumps are a technology that is getting more popular these days and is a good alternative to consider for reducing electricity usage”, says Tasol’s Managing Director, Mr. Chris Nelson. “Energy efficiencies reached by using heat pumps to heat water can be as much as 70 percent. However, by combining heat pumps with a technology such as solar water heating systems (a free energy source), forming a Hybrid system, electrical savings on water heating can be maximized up to 90 percent in some cases. This is indicated through tests done at our Energy test centre at the NMMU in Port Elizabeth,” Nelson adds.

The market for solar and other alternative energy solutions is expected to increase vastly within the next few years, due to the higher energy demand alongside the shortage of electricity capacity projected by economists for South Africa in the next 20 years.


heat pumps said...

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Unknown said...

Hi friend how are you I want share with you some tips about how we can save energy because now days energy short fall to much so we can save energy for our future. Ceiling insulation is the most effective barrier against the summer heat and the winter cold. A minimum of R3.5 is recommended for most areas in Victoria. Keep the heat inside during winter and the hot air out in summer by sealing up any gaps and cracks in external walls, floors and ceiling. Seal external doors using draught stoppers or 'door snakes' at the bottom and weather stripping around the frames. Close blinds, curtains, windows and doors on cold days to keep the heat in, and in summer use outside shading to keep the sun off the glass. Dress for the weather – in winter, wear extra layers inside and lower your heating thermostat. By setting your heating thermostat between 18-20°C, you can decrease your running costs by up to 10%. In summer, wear lighter clothing and keep your air conditioner’s thermostat between 24°C – 26°C Your fridge runs 24 hours a day 365 days a year. This adds up and makes it the most expensive appliance to run. Make sure that the door seal is tight and free from gaps so cold air doesn't escape. If you have a second fridge, give it a winter break - just turn it on when you need it. Only heat or cool and light rooms you are using. Where possible, zone your lighting and ducted heating or cooling and close off doors to unoccupied rooms.
Energy Advice Line