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Posts Tagged ‘heat pump’

The recuperator

Sunday, July 24th, 2011

What is a recuperator?

With recuperator – or mechanical ventilation system – it is possible to keep the air clean and fresh in the building, while the system prevents the escape of heat energy.

Why is this necessary?

Due to the strict energy standards the newly built buildings are insulated better and because of this, natural ventilation is reduced, so that the exhaust air is not exchanged as appropriate.

recuperator1 300x235 The recuperator

Recuperator operation

Opening the doors and windows, the ventilation can be solved, but due to this method, the building loses valuable heating energy. On the other hand, the recuperator’s heat exchanger absorbs the heat energy and returns it to the building.

The types of recuperators

There are also active and passive recuperators. The active systems include a built-in heat pump. Because of the heat pump, the active recuperator’s efficiency is much higher than the passive type. Although the system costs are higher, the investment returns on a long-term.

The advantages of recuperators

  • The heating costs could be reduced to 80-70%
  • Dust or other contaminants could be filtered
  • The pollen filter could reduce allergic reactions
  • The constantly rotating air eliminates mildew or fungus
  • Since the windows can be kept permanently closed, noise could be reduced significantly
  • There is no draft
  • Because the system saves energy, reduces exhaust emissions
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Efficiency of heat pumps – COP values

Monday, December 6th, 2010

To compare the effectiveness of several heat pump systems, we should rely on the so called COP value. The COP number defines, how much heat could be produced with a given amount of electricity, at a given temperature.

The following numbers are typical COP values for various heat pump systems. These values may vary depending on several factor, but these values could give a good approximation of what efficiency could be expected.

For example, on a mild winter day (10 ° C outdoor temperature) the air to water heat pump’s  COP value is between 3.0 and 4.0 (with 1W of electricity the heat pump could produce 3 – 4W of heating energy). In this case, the conventional electric heating system’s COP value is 1.0. To put it simply, to produce 1 Joule of heating, the system should use 1 Joule of electrical performance.

hoszivattyu cop 300x193 Efficiency of heat pumps   COP values

As the temperature decreasing, the air source heat pump’s COP values is getting closer to 1. At the temperature of -18°, the heat pump is no longer capable of producing additional energy, so suddenly the system’s efficiency is reduced as well.

In contrast to this, the geothermal heat pump operates with almost constant efficiency in the whole year. It is possible, because the soil has a constant temperature, and the probes could absorb the same amount of energy constantly.

Geothermal heat pumps could operate with a COP of 4.0 – 5.0.

To determine a similar value to cooling – as the COP – we should use the EER (energy efficiency ratio), or SEER (seasonal energy efficiency ratio). These values are usually characterized by the values ​​and units (kWh) / (kWh).

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