OUR SUPERIOR PERFORMING HEAT PUMP MODELS
Water in a storage tank for domestic use must be heated to, and maintained at or above 60oC to eliminate harmful bacteria. (some individuals turn off the electric boosters on their solar units to lower operating costs, but risk exposing themselves and their families to ill-health from bacteria which thrive in warm water)
The SOLAR myth exposed!
Because we tend to stay longer in the shower in winter, more hot water (energy) is required than in summer. Traditional solar systems offer the least solar gain in winter when we need it most.
Our heat-pump systems have excellent winter performance - without boosters.
As the hot water load increases our systems are able to maintain energy savings at around 75%. Convention solar collector heaters require considerable boosting to meet the increasing energy load in winter. Typically they use inefficient electric or gas boosters.
The chart below demonstrates clearly that a traditional solar-boosted electric element @ 100% efficiency will use more energy than our heat-pump at 400-450% efficiency.
The horizontal scale shows 12 months of the year with winter in the middle.
The vertical scale shows kw of energy.
The black line shows the energy requirement, rising in winter as we use more hot water.
The yellow line and area below it show the solar gain from a typical solar collector system. The area in the middle between the black and yellow lines indicates the energy required from the electric element booster@100% efficiency.
The red line and area below it show the solar gain achieved by our 327-SS system absorbing heat from the ambient air to pre-heat refrigerant. The area between the black and red lines indicates the energy required from the compressor.
Our systems do not require boosters!
General Comparison With Other Solar Water Heaters
In comparison to other heat pumps systems, and against conventional flat plate and evacuated solar tube water heaters with electric boosters, our “digitally controlled, timed de-icing system” provides a superior performing unit. All other heat pump systems which require electric boosting will have poorer performance.
Heat Pump Water Heater Systems In General
Heat pumps in general are very energy efficient when temperatures are above 10°C, however they have less spectacular performance at lower temperatures. This is partly to do with the actual air temperature used as the heat source but more importantly the de-icing factor.
Ice tends to build up on the evaporator of a heat pump in cold weather when there is high moisture content in the air. As this cool moist air passes through the evaporator it loses 8°C to10°C, if the ambient temperature is below 10° then any moisture will form ice on the evaporator as its temperature will drop to 0°C. This ice will reduce performance or stop the heat pump working altogether; therefore some form of de-icing must be initiated.
Some heat pumps, that try to work in cold weather, switch on various forms of de-icing systems to remove this ice, however they are only activated by temperature. This means that while ever the temperature is below the de-icing point, say 7°C, the de-icing will be on. This wastes energy as even after the ice has been cleared, the system is still heating the evaporator. Other heat pumps do not try to work in cold weather but simply switch out the heat pump and switch in an electric element in the tank – in effect they are now just a conventional electric emersion element water heater.
Skyline Energy is proud to distribute Heat Pump Water Heaters that use a digitally controlled, timed de-icing system. This brings on the de-icing when ambient temperatures are such that icing-up is likely, however it is also a time controlled de-icing sequence.
Our advantage here is that the de-icing time is quite short and only the energy required to actually remove the ice is used. Once the short de-icing cycle is completed, de-icing is disengaged and all energy is used to heat the water.
This advanced system allows our units to operate down to ambient temperatures of minus 5°C without any form of booster.
Energy Usage Comparison – With Other Heat Pumps
As some other heat pumps are unable to operate below 7°C they use an electric booster at these lower temperatures & in effect become a conventional electric water heater. When these other heat pumps use their electric booster elements to heat the water their efficiency falls to the same as a conventional electric HWS. This would occur on a daily basis in winter weather and in other seasons may still happen if, for instance, the units were heating at night.
Our 264-SS and 327-SS heat pump water heaters would be using considerably less energy at lower ambient temperatures than other heat pump systems on the market, units whose cold weather performance is considerably reduced which affects their overall performance rating. (This fact is often completely ignored when we are grouped in with other heat pumps).
Passive “Flat Plate” Solar Water Heaters
One major advantage we have over flat plate water heaters is ease of installation. Installed at ground level in a similar fashion to a conventional electric water heater, our heat pump systems require no mounting frames or roof strengthening, greatly reduces workplace safety issues, and is more robust.
We have taken the heat pump water heater way beyond what was generally regarded as the norm for this type of equipment.
Only a few years ago it was not thought feasible to have a heat pump water heater operate down to the extreme low temperatures that our units can now work in. Indeed, the data generally available is based on studies done in the USA about 5 years ago and in these studies heat pump systems could not operate much below 10°C. We have moved the goal posts considerably since then to produce a true “all climate” heat pump water heater.
Energy Reduction – That’s What It’s All About
The considerable research and development invested in our heat pump has produced a world class heat pump water heater, one that can operate in ambient temperatures right down to minus 10°C without resorting to an electric element for boosting.
In actuality, our Heat Pump Water Heater outperforms conventional flat plate solar water heater (with electric boost). Conventional solar cannot provide its solar contribution (at the rated SCF) every day of the year, (i.e. on cloudy / rainy days) and will rely totally on the booster, while our heat pump can do just this, is not nearly so affected by changes in the weather and will provide its rated output rain, hail or shine with very little variation.
For more information, please
call the national number below.
1300 552 976