Category: Technical information associated with Mitsubishi Electric
Case Studies 2
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Mitsubishi Electric
Case Studies 2
Ecodan Case Study
A four bedroom house in Bedfordshire is the first home in the UK to
benefit from the new, revolutionary Ecodan heat pump. As a result CO2
emissions from the home’s heating system were reduced by 47% and the
overall carbon emissions from the property by an impressive 34%.
The homeowner sought to reduce his carbon footprint and by installing
Ecodan was able to do so, whilst at the same time, providing an ideal
case study for the advanced heating system in operation.
Built in 2000, the four bedroom detached house has double glazed windows
as well as loft and wall insulation. The existing heating system was
previously run by an 80% efficient gas boiler providing 23.2kW of heat
output from an input of 29kW. Based on the existing radiators it was
calculated that the total heat output of the radiators was 13.4kW under
standard boiler conditions with a flow temperature of 70ºC and the hot
water demand of the home totals 140 litres per day.
Using the Ecodan heat pump, the heat load of the house was calculated to
be 8kW. Operating at a flow temperature of 55ºC the heat output of the
radiators will be 8.4kW, confirming that Ecodan is fully capable of
meeting the heating demand of the house, using the existing radiators.
In addition, one area of the house was changed to under floor heating.
The heat load of a house varies with ambient temperature. Traditional
systems would vary the output from the radiators by turning them on and
off frequently with Thermostatic Radiator Valves (TRV’s), in order to
meet the fluctuating demand.
As the ambient temperature increases, the heat load of the house
decreases. The highly efficient Ecodan varies radiator heat output by
changing the flow temperature, ensuring the highest level of COP
possible. With average UK winter temperatures ranging between 2ºC and
7ºC, Ecodan operates at average flow temperatures between 35ºC and 45ºC
providing the highest levels of energy efficiency
New System Uses Excess Heat to Provide Free Hot Water
The owners of a 4-bedroomed house in Kent have been using a unique
new boiler to provide free heating for their swimming pool, whilst
enjoying fully controllable air conditioning to provide year-round
comfort cooling and heating.
When the house, which stands in the grounds of an Equestrian Centre near
Dartford, Kent, was being refurbished the owners decided to install air
conditioning in the bedrooms and an annexe containing a small gymnasium.
With rising summer temperatures, especially in the South East of
England, the owners wanted a system that would provide comfort cooling
particularly at night, but which would also be versatile enough to cope
with Britain’s variable temperatures by being able to switch to heating.
“Added to this was the need to replace the heating source for the
property’s outdoor swimming pool, which had previously been heated by a
wood-burning boiler,” explained Andy Hubble of H and H Services Ltd, who
installed the Mitsubishi Electric equipment.
This wood-burning boiler had proven expensive to run, troublesome to
maintain and made it very difficult to control and regulate the
temperature of the pool. Whilst summer cooling was the primary driver
for the installation, the owners also wanted to control energy costs and
find an alternative to the high maintenance pool heating system.
With the installation of a City Multi 2-pipe VRF heat recovery system
coupled to the unique PQFY heat pump boiler, the owners now have the
best of both worlds - fully controllable air conditioning, and free hot
water for the swimming pool.
The PQFY heat pump boiler uses the vapour compression cycle of the air
conditioning system to raise the water temperature of the outside pool
to a comfortable level.
Instead of simply discharging the heat from the refrigerant to the air
as in a conventional split type air conditioner, the hot gas pipe in the
PQFY runs through the water piping in a unique tube-in-tube coaxial
system that extracts the heat from the refrigerant cycle and transfers
it directly to the water, effectively providing free hot water for the
swimming pool and helping to reduce the running costs by more than half.
It is also around four times better than the most efficient type of
conventional gas boiler on a kW / kW basis, leading to a substantial
reduction in CO2 emissions.
Technical information associated with: Mitsubishi Electric - VRF Air Conditioning, City Multi Super
Y R2 WR2 Series
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Ecodan Case Study
Ecodan Case Study
Equestrian Centre, Dartford, Kent
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Mitsubishi Electric Europe
Air Conditioning Systems Division
Travellers Lane
Hatfield
Herts
AL10 8XB
Tel (General) : 01707 282880
Tel (Sales) : 01707 282800
Fax : 01707 278674
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