A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Suuret kalliotilat. Kalliotilojen laempoehaevioeiden maeaeritys. (Large rock caverns. Heat loss analysis of rock caverns)
Average heat losses conducted during a calculation period of five years from a rock cavern heated to a temperature of 14-28 deg C were determined using an element method. The widths of the analyzed caverns varied between 8 and 24 metres and their roof thicknesses between 7 and 15 metres. The results agree well with the results obtained in the studied of thermal losses and heat consumption in the Otaniemi rock caverns in 1983-1986. The instantaneous peak values of the average heat losses were found to be 4-13 W/m(sup 2) depending on the size, depth and inside temperature of the cavern. Those peak values decrease rapidly to be stabilized in 1-2 years after the temperature inside has been steadied. The stabilized heat loss values which can be regarded as starting-points for dimensioning the heating and air-conditioning installations are 60-80% of the peak value, varying from 2 to 10 W/m(sup 2). The annual temperature variation at the surface causes a variation of 1 W/m(sup 2) in the heat losses conducted from a cavern with a roof of 7 metres. The annual variations in loss values cannot be observed when the roof thickness is more than 11 metres.
Suuret kalliotilat. Kalliotilojen laempoehaevioeiden maeaeritys. (Large rock caverns. Heat loss analysis of rock caverns)
Average heat losses conducted during a calculation period of five years from a rock cavern heated to a temperature of 14-28 deg C were determined using an element method. The widths of the analyzed caverns varied between 8 and 24 metres and their roof thicknesses between 7 and 15 metres. The results agree well with the results obtained in the studied of thermal losses and heat consumption in the Otaniemi rock caverns in 1983-1986. The instantaneous peak values of the average heat losses were found to be 4-13 W/m(sup 2) depending on the size, depth and inside temperature of the cavern. Those peak values decrease rapidly to be stabilized in 1-2 years after the temperature inside has been steadied. The stabilized heat loss values which can be regarded as starting-points for dimensioning the heating and air-conditioning installations are 60-80% of the peak value, varying from 2 to 10 W/m(sup 2). The annual temperature variation at the surface causes a variation of 1 W/m(sup 2) in the heat losses conducted from a cavern with a roof of 7 metres. The annual variations in loss values cannot be observed when the roof thickness is more than 11 metres.
Suuret kalliotilat. Kalliotilojen laempoehaevioeiden maeaeritys. (Large rock caverns. Heat loss analysis of rock caverns)
A. Vaeaetaeinen (author) / J. Ritola (author)
1989
65 pages
Report
No indication
English
Elsevier | 1987
Elsevier | 1986
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