24 June 2014

HEAT PUMP APPLICATION RECOVERING EXHAUSTED AIR ENERGY IN LARGE APARTMENT BUILDINGS


Finland belongs to the cold climate zone in Europe where heat pumps are
increasingly used for decreasing the space heating costs and CO2 emissions of buildings. Typical applications today can be divided to two main categories. 1. Ground source or air-towater
heat pumps in buildings having either radiators or floor heating. 2. Air-to-air heat pumps for buildings having direct electric heating. A new category in Finland is an application where the energy source for a heat pump is the exhausted air of an existing building.
Significant cost savings can be achieved by recovering the energy of the exhausted air and transferring it back to the buildings heating system. Recovery ratio is higher compared to the
traditional heat recovery with ventilation. The main markets for this kind of application are the existing large apartment buildings connected to district heating where air is exhausted by one or two centralized roof ventilators without any recovery. First installations in Finland have been made and energy consumption before and after installation has been measured. This presentation describes how this kind of application works, what are the savings and benefits to the customer and the environment.