Economical And Environmentally Friendly - Panasonic WH-SDF03E3E5 Series Design Handbook

Introduction

Economical and environmentally friendly

Example
1.3 Economical and environmentally friendly
10
Coefficient of performance = 5.08 (A7 / W35)
For an outside temperature of 7 °C the air / water heat pump produces
hot water at 35 °C at a COP of 5.08. Thus, 5.08 kilowatt-hours of heat
energy can be generated from one kilowatt-hour of electrical energy.
Performance factor is more meaningful than the COP, which represents
the ratio of heat energy output to the electrical energy input over a cer-
tain period. The seasonal performance factor (SPF) is the ratio of heat
energy output to the electrical enegy input over a one year period. It is
obtained from heat and electricity meters and includes all aspects of the
heat pump system.
Similar to the coefficient of performance for the heating operation, the
coefficient of performance for the cooling operation is defined as the
ratio of heat power removed to the electrical power input. In contrast to
COP, it is abbreviated with EER = energy efficiency ratio.
More than 75 % of energy use in the household is used for heating and
hot water. At the same time fuel prices (oil, gas, wood pellets) are sub-
ject to strong price fluctuations and are becoming increasingly more
expensive.
In contrast, an Aquarea heat pump utilises up to 80 % free ambient heat
can be used. Electrical energy must be used only for the remaining 20 %
of the heat pump operation. In comparison with a direct electric heater,
the amount of electrical energy used for the same heat production is
reduced down to a quarter.
In comparison with fossil fuel based heating systems, the dependence
on oil price and risky energy imports is therefore reduced. In addition,
the share of renewable energy in electricity production today is already
about 25 % in the UK and expected to rise. Besides the ambient heat,
the electric energy used for heat pumps is increasingly derived from
renewable energy sources.
Besides low electricity use, a yearly oil or gas service is no longer re-
quired. Additionally, the investment costs for an Aquarea air / water heat
pump are proportionally lower in comparison to other heating systems
with natural gas connection, chimney, oil tank or boreholes.
Aquarea heat pumps can optionally be operated also with cooling
function and supplemented with a solar system. This allows comfort
and efficiency to be increased further.
Aquarea air / water heat pump – design handbook 07 / 2014