HOT WATER HEAT PUMPS
In order to provide answers in the case of special requirements, it is often necessary to identify solutions that deviate from the standard. Ecodan heat pump systems, which can be used for heating, cooling and domestic hot water (DHW) production, use the refrigerant R410A – in contrast, the QAHV uses the refrigerant R744. After all, pure hot water heat pumps, which are tasked with generating particularly high hot water temperatures, have to meet very different requirements of their own.
R744 – a refrigerant from nature
Behind the type designation R744 is the natural refrigerant CO2. Carbon dioxide (CO2) is almost the ideal refrigerant in ecological and safety-related terms as it has an ozone depletion potential (ODP) of 0. In addition, it is non-toxic, non-flammable and chemically inert – properties that render recovery and disposal unnecessary.
Carbon dioxide also features a number of unique thermophysical properties:
Benefits AT A GLANCE:
CO2 AS A REFRIGERANT
CO2 TECHNOLOGY AT
In addition to heat pumps, which traditionally use the refrigerant R410A, Mitsubishi Electric also uses the QAHV water heat pump to develop systems in which the natural refrigerant carbon dioxide is used. In the innovative heat exchanger of the QAHV hot water heat pump, three connected refrigerant pipes are wound around the screw-shaped water pipe in a spiral in order to achieve maximum heat transfer. The continuous spiral-shaped grooves in the wound pipe speed up the turbulence effect of the water while simultaneously reducing the pressure loss within the heat exchanger. In this way, they help increase the degree of efficiency.
QAHV – HOT WATER HEAT PUMPS
FOR THE HOUSING INDUSTRY AND COMMERCIAL USE
The QAHV heat pumps have been developed in large numbers especially for hot water generation, for example in the housing industry, in commercial applications and in industrial applications. Thanks to the unique Mitsubishi Electric technology, QAHV units also ensure extremely reliable operation and high heat outputs even at low outdoor temperatures.
The QAHV system generates flow temperatures of 90 °C at outdoor temperatures as low as -25 °C and with a hot water COP of up to 3.88. The latest inverter scroll compressors provide the decisive advantage in this regard, ensuring a considerable boost in efficiency that is beyond the capabilities of fixed-speed systems.
STABLE OPERATION –
EVEN AT -3 °C
The QAHV heat pumps deliver full heating output even at outdoor temperatures of -3 °C. The fundamental technology is a flash-injection circuit that supplies the system with the optimum amount of refrigerant via a compressor through a specially developed injection opening, thereby guaranteeing particularly stable operation.