About Air Source Heat Pumps

© Copyright Paul Fletcher

What is a Heat Pump?

• A heat pump is a solar powered device, a heating machine.

• It uses electricity to convert the sun’s energy stored in the earth or air into heat

• This can be your home’s heating, hot water and even a swimming pool.

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A heat pump is therefore a ‘renewable energy device’, and so part if a sustainable energy strategy.

Why a Heat Pump?

• Uses 4 times less energy than other fuels.

• That’s 4 times less carbon footprint.

• They use electricity.

• Most renewables produce electricity.

• That means they can be powered by off-shore tidal and wind energy, and on shore solar photovoltaics and micro water and wind turbines.

• 4 times less capital required to invest in renewables to power them.

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The future is electricity. Hence UK and other governments are promoting

heat pumps, as a way of independence from oil nations, whether

renewables or nuclear.

E-Si does not support nuclear energy as a way forward, and does not support new-build nuclear. Our

stance is, however, that all existing n-power stations should be worked until the end of their useful life..

Why a Heat Pump?

• At least half the running cost of oil. *

• 4 times less the running cost of non-condensing gas.

• At least half the cost of Electric Thermal Stores

• Direct Electric boilers are not the answer though there is a place for them in hybrids where solar heating and heat pumps can be the primary heat source.

• Thermal stores do not provide a good solution. Buffer tanks are more useful in order to boost the volume of water to be heating, reducing return temperatures, enabling a mix of alternative fuels to preheat rather than actually mix.

* A National Home Energy Rating Assessment will ascertain the running costs and energy use of each individual’s customer’s home.

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How do Heat Pumps Work?

Uses 4 x less energy than other fuels? How???

Seems impossible??

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Heat

Pump

Oil /

Gas

Boiler

Electric

Boiler

Electric IN Av 400% Efficiency (between 300 and 500%)

Oil/Gas IN

Electric IN

Av 95% Efficiency (Condensing)

100% Efficiency

Global Investment

How do Heat Pumps Work?

4 x less energy? How???

We see Heat Pumps work, every day.

Heat Out from radiator at rear of Fridge

Warm Milk In

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How do Heat Pumps Work?

Solar Energy

Stored in the Air

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Compressor

Heat

Exchanger

Heat

Exchanger

House Heating

Circuits:

UFH

Radiators

Hot Water

Swimming Pool

Typ -5 to 20 deg CElectric IN

AIR Source Heat Pump

Warm

Air IN

Cool Air

OUT

How do Heat Pumps Work?

Solar Energy

Stored in the Air

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Compressor

Heat

Exchanger

Heat

Exchanger

House Heating

Circuits:

UFH

Radiators

Hot Water

Swimming Pool

HighTemperature Circuit

Typ -5 to 20 deg C

Heating Pump

Compressed Gas Pump

Electric IN

AIR Source Heat Pump

Warm

Air IN

Cool Air

OUT

40 to 60 deg C OUT

Large Area of Low Grade Heat, Converted to small areas of High Grade Heat

Heat Pump Myths

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They don’t provide enough heat do they?

If correctly sized there’s never an issue. E-Si will advise you according to your home and personal requirements.

E-Si uses Intelligent Heating Controls. This ensures start-up times and run times meet your needs exactly. Weather optimisation and fine internal control, means high comfort environment.

Its best to run heat pump programs over longer time periods, with lower call on heating. This increases efficiency and enables higher comfort.

Best to have larger hot water stores at lower temperatures to ensure plenty of hot water.

Air Source Heat Pump Types

• TEV Size Range: 6, 8, 12, 13kW• Or can work in Multiples• All Available in single or 3 phase.• All supplied with ‘soft start’ motors.• Utilise external hot water tank, Geminox, 300 litres • Could use 200 litres if pushed for space, just less stored hot water, coil size is about the same.

• Lots of Chinese models around. Keep away.• Lots of re-engineered air-con units – keep away.• We use market leaders TEV or Calorex, depending upon application.• Tried and tested designs.• Calorex making heat pumps for 30 years.• TEV manufacturing for 4 ½ years.• TEV heat pumps used by councils up and down the country. 4000 installed.• New Mitsubishi Ecodan has become market leader.• We prefer Mitsubishi for domestic, Calorex for pools.

Looks like airconWorks like reverse airconSounds like air-con

The TEV ASHP

’Heatking’

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Air Source Heat Pump Types

• Size Range: 5, 9, 14kW• Can be sequenced in Multiples• Single or 3 phase.• Utilise external hot water tank, Geminox, 300 or 200 litres.

Modulating Compressor – most efficient on the market

Features are:

• Modulating, so compressor speeds up and slows down• Output varies according to heat load. • Ease of design engineering.• Very Flexible installation possibilities.• Obviates ‘start currents’ so can be installed in more places.• Almost Silent Running.• Means PVs can more easily displace running costs.

The Mitsubishi ASHP

’Ecodan’

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Mitsubishi

14kW

9kW

Air Source Heat Pump

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Typical Schematic

240V AC Single Phase

On E20 / Heat Pump Tariff via

Cyclotron

Mains Cold Feed

300L tank

House Rads 1st F

Hot Water to Taps

P1

DHW

TH.

3kW 240V AC

Thermostat operates

Immersion. Can be

operated manually or auto

to 60C..

Air Source

Heat Pump

DHW

Comes as

part of DHW

SET 19-20C

SET 40 to 50C

MV1

House Rads G F

MV2

Dataterm

Secondary Return

1

4

2

Relay

Volt-Free Contacts

Relay

Solar PV can assist powering this

Air Source Heat PumpCase Study 1

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La Platte Rocque, Jersey – Large & Leaky Controls, Pumps, 500L Hot Water

2 x 12kw ASHPs Our engineer’s Paul and Matt

HW Tank, Buffer Tank + 24kW Electric Boiler Backup

Integrated Air Source Heat Pump with Electric Boiler

HYBRID

Air Source Heat PumpCase Study 2

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The Garage and Flat of The Mount, Sevenoaks.There’s a massive leaky house the other side!

2 x 14kw Mitsubishi ASHPs – the finished result.

Our electrical engineer’s Darnell and Dave wiring system in the Garage. This is the electric boiler backup/buffer tank.

Work in Progress

Complex Air Source / Hybrid for Central Heating, Hot Water and Pool.

Renovation of Plant Room.

Renovation of the Control Board.

Paul Fletcher working on ASHP electronic boards.