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Dimplex
Air Source Heat Pumps
Why Choose a Heat Pump?
In the context of ever rising energy costs and
climate change, every household is in need of a heating technology
that is future-proof, cost-effective and independent of fossil
fuels.
Using Nature’s Energy
Heat pumps make a significant contribution
towards solving the problems associated with increasingly scarce and
evermore expensive energy resources – supplying more energy than
they consume by tapping into the freely available, inexhaustible
solar energy stored in the earth, the ambient air or water and
converting this for use in a heating system.
In fact up to 75% of the energy needed by the
heating system is extracted from the environment, so the only energy
required is electricity needed to drive the heat pump compressor.
Put another way, for every 1kWh of electricity
used to run the heat pump, up to 4kW of useful heat is provided,
giving th heat pump an efficiency of up to 400%.
A Low Carbon Heating Solution
Whenever fossil fuels such as gas or oil are
burnt, carbon dioxide is released. CO2 is the principle contributor
to the greenhouse effect which is leading to long term climate
change.
However as heat pumps extract as much as 75% of
their heating energy from the environment, building carbon emissions
for heating can be reduced by as much as 50% compared with gas
fuelled heating systems.
This is an obvious benefit when considering
building regulations Part L compliance, planning obligations
requiring minimum contributions from renewable energy and EcoHome /
Code for Sustainable Homes ratings.
Low Running Costs - Low Ownership Costs
The considerable contribution from renewable
energy sources also helps to provide running cost savings over
fossil fuelled heating systems and arguably more importantly, future
proofs the system against future energy price increases.
But fuel costs are only part of the story. Unlike
gas and oil based systems, heat pumps require no costly regular
maintenance or annual safety inspections. And because a heat pump
has a reasonable life expectancy of 20 – 25 years, typically twice
that of a boiler, the investment costs can be recovered over a
longer period meaning the ownership costs over the working life of
the system are demonstrably lower.
Click on image for larger view
Figures compared over a 20 year period for space
& water heating for a typical 3 bed semi detached home (new build).
*Fuel costs based on 2007 gas & electricity prices.
Trusted technology
A heat pump heating system consists of 3
components: the heat source, the heat pump itself and a heat
distribution and storage system.
Heat pumps are able to produce more energy than
they consume by using the conventional refrigeration cycle to absorb
heat from the environment and raise it to a suitable level for
heating.
1 75% of the energy is taken from the environment
i.e the air or ground & transferred to the heat pump.
2 25% of the energy is sourced from the national
grid in the normal way of supplying your electricity. This is used
to operate the heat pump but with very low consumption
3 The energy from the air or ground is
transferred to the refrigerant inside the heat pumps evaporator.
This causes the temperature of the refrigerant to rise & change
state from liquid to gas.
4 The refrigerant gas is then compressed, using
an electrically driven compressor, reducing its volume but causing
its temperature to rise significantly.
5 A heat exchanger (condenser) then extracts the
heat energy from the hot refrigerant to heat water for central
heating, underfloor heating or domestic hot water.
6 After giving up its heat energy the refrigerant
turns back into a liquid & is able to absorb energy from the
environment, allowing the cycle to begin again.
Using Nature’s Energy Efficiently
Heat pumps are among the most efficient heating
and hot water systems available today. Approximately 75% of the
energy needed for heating comes from the environment. This means
that for every 1kWh of electricity used to power the heat pump
compressor, between 3 and 4 kWh of heating energy are produced,
giving the heat pump an efficiency of 300-400% or higher.
The heat pump’s “efficiency” is known as it’s
“Coefficient of Performance” (CoP). This is simply a ratio between
the proportion of the total energy supplied that can be extracted
from the environment and the amount supplied by electricity to run
the heat pump compressor. The higher the CoP, the more “free”
environmental energy the heat pump is using!
Built to Last
1 Powerful, quiet, safe & reliable: The “heart”
of the heat pump is the Copeland scroll compressor, providing high
levels of efficiency, reliability & low noise operation.
2 Always in control: The WPM heat pump manager
monitors, regulates & controls the entire system to ensure optimum
performance & efficiency for heating, domestic hot water & where
applicable, cooling.
3 Evaporator: Large surface area plate heat
exchangers allow for efficient heat transfer of energy from the
environment. They are compact, efficient & reliable.
4 Insulated casing: Sound insulation around the
insides of the heat pump casing reduce operating noise to a minimum.
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