The influence of environmental and geometrical factors on air-ground tube heat exchanger energy efficiency

Adrian Trząski , Bernard Zawada

Abstract

More and more efficient solutions of thermal insulation of buildings result in an increasing role of ventilation in the energy balance of buildings. This leads to a necessity for seeking unconventional heat sources, as well as development of the exhaust air heat recovery methods. The use of heat accumulating potential of the ground perfectly fits into this trend, allowing natural pre-heating and pre-cooling of the inlet air. There appears to be very limited research and published data on their thermal performance in Poland. This paper introduces a developed method of air-ground heat exchanger (AGHX) performance evaluation together with its validation and research results of conducted simulation. The AGHX model (based on a quasi 3D finite elements method) allows analysis of energy performance dependence on a wide range of parameters including AGHX geometrical configuration, mode of operation and environmental factors. The simulation results indicate that the analyzed parameters in various degrees affect the thermal efficiency of AGHX; various is also the nature of their impact. For some of them it is possible to set a value to maximize heat or cold yield (pipe diameter and placement depth, number of parallel pipes, bypass system, soil thermo-physical parameters, ground area shading and ground surface cover). In other cases, the influence of parameters has an asymptotic nature for which the maximum heating or cooling efficiency is achieved for parameter values tending to infinity (pipe length and distance between parallel pipes).
Author Adrian Trząski ZKO
Adrian Trząski,,
- Department of Heating and Ventilation
, Bernard Zawada ZKO
Bernard Zawada,,
- Department of Heating and Ventilation
Journal seriesBuilding and Environment, ISSN 0360-1323
Issue year2011
Vol46
No7
Pages1436-1444
Keywords in EnglishAir cooling, Air-ground heat exchanger, Air heating, Air-soil heat exchanger, Energy efficiency, numerical model
DOIDOI:10.1016/j.buildenv.2011.01.010
URL http://www.sciencedirect.com/science/article/pii/S0360132311000205
Languageen angielski
Score (nominal)35
Publication indicators WoS Impact Factor: 2011 = 2.4 (2) - 2011=2.281 (5)
Citation count*12 (2015-05-10)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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