VARIATION IN THE GROUND-TEMPERATURE PROFILE

VARIATION IN THE GROUND-TEMPERATURE PROFILE - VARIATION IN...

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VARIATION IN THE GROUND-TEMPERATURE PROFILE WHILE ABSORBING THE HEAT BY MEANS OF THE VERTICAL HEAT EXCHANGER :ÆDG\VÆDZ±6=$)/,. Technical University of Szczecin, Department of Heating and Air Condition al. Piastów 50, 70-311 Szczecin, Poland tel. +4891 449-46-09; +4891 449-40-69 e-mail: [email protected] Aleksander A. STACHEL Technical University of Szczecin, Department of Heat Engineering al. Piastów 19, 70-310 Szczecin, Poland tel. +4891 449-40-38, fax. +4891 449-45-91 e-mail: [email protected] Introduction Using the energy of low-temperature resources and its conversion by a heat pump into the higher temperature level useful for heating seems to be a beneficial alternative to the traditional energy sources. Usually, the heat accumulated in the natural environment and the waste heat generated by various manufacturing processes are used as a low-temperature heat source here. Among other natural energy sources, it is the heat accumulated in the ground that constitutes a large potential of energy easy to use [9]. Heat is taking from the ground indirectly, i.e. through the ground-embedded heat exchangers with the fluid that circulates as the energy medium transferring the inner energy from the ground to the heat pump [5]. In practice, two types of ground-heat exchangers are used. Here, the collecting pipes laid horizontally at a specific depth below the ground surface are the most widespread collectors. Nevertheless, if an exploitation lot is the area-limited one then the vertically arranged heat exchangers – the so-called heat probes – are used. These heat exchangers are made up of pipe collectors embedded into the vertical boreholes, and are of different design solutions. The number, length (depth) and spacing of the relevant heat exchangers are predicted experimentally or by means of simplified calculations. Knowledge of the thermal field round such probe plays a crucial role in these calculations. Taking the heat from the ground causes that ground layers around the heat collectors are gradually cooling down. Under environmental conditions, the ground is getting warmer mostly in the summer, while taking up the ground-heat is ceased. The natural thermal energy is mainly penetrating and accumulating in the ground due to the solar radiation. Transferring the heat from the outside, owing to the ground thermal conductivity, is equally vital. In this paper have been discussed the problems concerning the analytical method of determination the thermal field around the vertical ground heat exchanger. In the first part of the paper has been presented in short the simplified method of determination the thermal field around the single probe in the function of time of taking the heat and with regard to thermal properties of the ground. Additionally there have been presented the experimental results this method’s verification.
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This note was uploaded on 02/26/2012 for the course AS sas taught by Professor 12 during the Spring '12 term at Arkansas.

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VARIATION IN THE GROUND-TEMPERATURE PROFILE - VARIATION IN...

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