An example of energy efficient use of subgeothermal resource for the air-conditioning of sales complex

Abstract

For the air-conditioning of the IKEA sales complex in Belgrade, the exploitation of groundwater, as a subgeothermal resource, was carried out, using a heat pump. The groundwater from a karst aquifer is abstracted by the three drilled wells, the depths of which are 87-103m. Based on the results of the 1-year trial exploitation, in the period August 2017-July 2018, balance reserve of the groundwater is 10.8 l/s, with temperatures in the range 22.0-22.9 0C, which gives the nominal available thermal power of the system of 774 kWt. The applied air-conditioning solution can be assessed as energy efficient, due to the efficiency of the "water-water" heat pump system, as well as to an environmental contribution, by the substitution of fossil fuels. Preliminary economic analysis shows that total financial investments in the system, compared with the "conventional" alternative solution, are paid after less than six years.

Keywords

• groundwater
• heat pump
• air-conditioning
• energy efficiency
• belgrade