WHAT IS A HEAT PUMP?

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AIR SOURCE HEAT PUMPS
AND DISTRICT HEATING

WHAT IS A HEAT PUMP?

Ingeniously simple: Operating in a similar way to a domestic refrigerator in reverse, a heat pump harvests naturally occurring energy, upgrades it and uses it to generate space and/or water heating.

heat-pump
heat-pump-diagram

STEP 1. EVAPORATION

(Outdoor unit heat exchanger)

Cool liquid refrigerant passes into
the evaporator

Heat energy from outside air passes over the evaporator via a fan

This causes the refrigerant to increase in temperature and change to low pressure vapour

STEP 2. COMPRESSOR

The vapour enters the compressor

The compressor squeezes the refrigerant and increases the refrigerant pressure

The temperature increases and changes into a hot gas

STEP 3. CONDENSER

(Plate heat exchanger)

The hot refrigerant gas condenses as it passes through the plate heat exchanger

Heat is transferred to the water side of the plate heat exchanger and into the primary water circuit

As it condenses the refrigerant cools and changes from a gas back into a high pressure cool vapour

STEP 4. EXPANSION VALVE

The cool vapour refrigerant still has a
high pressure

The refrigerant passes through an expansion valve to reduce the pressure

As the pressure drops a further drop in temperature occurs, returning refrigerant to its initial state of a cool low pressure liquid

Ingeniously simple: everyone has one….

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