Why to choose air-to-water heat pumps from REVEL

Reasons why to choose air-to-water heat pumps from REVEL

Air-to-Water Heat Pumps - a Cost-Effective and Environmentally Friendly Choice

Air-to-water heat pumps are being increasingly used for the space heating and hot water preparation. They are extremely friendly to the environment since they can produce more energy than what is hidden in the coal beneath the ground, even before it is touched by human hands. The air-to-water heat pumps and their growing use are a global trend. The reasons are both environmental and financial. Boreholes and extensive ground collectors are a cost-intensive option. Moreover, air temperature in the winter period is ranging mostly between -7°C and +13°C in our latitudes, and thus, the mean air temperature during the heating period is approx. +3°C. Temperatures in the ground are relatively stable, and according to experience gained, they stabilize at around -2°C in the vicinity of the borehole.  A gain in temperature of 5°C in favour of the air-to-water heat pumps can be noticed.

Principle of the air-to-water heat pumps

As the name implies, heat pumps are designed to transfer thermal energy from one environment to another, by using special substances (refrigerants). This is not a conversion of energy in the true sense of the word, but a transport of energy from one environment to another with a very favourable ratio. For illustration, if we deliver 1kWh for the transfer of energy by the heat pump, we can get 3 kWh or even more in the form of heat. This ratio is based on the difference of the temperatures between the cooled and heated environment. Since the output temperature of the heat pump cannot be higher than around 60°C, we need to make every effort to clench the imaginary scissors that are opened up between the exterior and interior environment as much as possible in order to get the most favourable ratio (so-called heating factor). 

Choice of the Heating System – Underfloor Heating System or Radiators?

The air-to-water heat pump principle indicates that the energy should be delivered through a low-temperature system, preferably an underfloor heating system (wet, dry or semi-dry) with a medium temperature of the fluid of around 33°C. When radiators are used, a drop in efficiency by around 20% compared to the underfloor heating systems is to be expected. If you still prefer the radiator system, you should use convectors with the forced movement of air by fans. You can choose between the wall-mounted, free standing and floor-mounted version.

 Air-to-Water Heat Pumps and Heating of Water

Another field in which the air-to-water heat pumps can be used with advantage is heating of water in an outdoor pool during the colder season of the year, when the air temperature lies at around +15°C and the pool water temperature should be maintained at +28°C. Under these conditions, the efficiency level of the air-to-water heat pumps may reach up to 6:1.

Hot water preparation is also highly efficient during summer (operating costs lie at around CZK3/day) and the installation of solar panels would not pay off. Hot water preparation should be a two-stage system composed of water pre-heating in a water heater with heat trap and additional heating in purely electric way in another cylinder. REVEL offers a brand-new duplex water heater DZD REVEL with a capacity of 2x160 litres.

Noise Levels of the REVEL Heat Pumps

REVEL has focused on excessive noise levels as one of the most common objections against the air-to-water heat pumps. The main source of noise is not generated by the compressor, but the fan. The amount of air that must pass through it is around 4 to 5 thousand m3 per hour (related to the nominal output power of 10kW). The noise level is greatly influenced by the shape of the propeller fan, and therefore REVEL has developed a special four-blade propeller that is fully accommodated to the diffuser of the REVEL heat pumps. At the same time, a forced draft mode of operation is used instead of a standard suction mode. Besides other benefits, it also helps significantly reduce the noise level. Heat pumps by REVEL have been subjected to a series of noise level measurements at the Testing Institute in Brno, and the results obtained are more than satisfactory.

Design and Turnkey Delivery in One

In case of your interest, REVEL will plan the whole system for your property, and through our Installation Division you can get a complete delivery of the system on turnkey basis. However, this is not mandatory, and after you receive the design documents from us, it will be fully upon your choice whether you will use our installation team, or whether you will request quotations from other local companies, which have been trained in the installation of heat pump systems.