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SUPSI – DACD – ISAAC
page 33
Global room-cellar heat transfer coefficient [UCelBu]: the global room-cellar heat transfer coefficient determines the total heat transfer coefficient (transmission and ventilation) between the
heated rooms and the cellar. The corresponding specific losses Ucm are obtained with formula
8.6.
Ucm (W/K) = Cellar_floor_area (m2) x UCelBu (W/m2K)
(8.6)
See formula 8.5 for the calculation of Cellar_floor_area.
- If the top of the bore/pile field is in contact with the outside air temperature, set the two parameters AchRat and UCelBu to:
AchRat = 1025 [1/h] (previous parameter)
UCelBu = 0 [W/m2K]
- If the heated zone (with a room air temperature fixed to TairH) is in direct contact with the
bore/pile field (no cellar), set the two parameters AchRat and UCelBu to:
AchRat = 0 [1/h] (previous parameter)
UCelBu = 1025 [W/m2K]
The global room-cellar heat transfer coefficient is labelled:
UCelBu
Insulation thickness between ground and cellar [Hinsul]: the insulation thickness between the
ground and the cellar determines the thickness of the insulation layer that lies between the cellar and the ground. A thermal conductivity of 0.05 W/mK is assumed for the insulation material.
The horizontal pipes that connect the heat exchanger piles to the pipe collectors are supposed
to lie below the insulation layer. A different thermal conductivity for the insulation material (for
example "New_lambda_insulation" W/mK) can be taken into account by using formula 8.7.
Hinsul = Hinsul_actual x 0.05 (W/mK) / New_lambda_insulation
(W/mK)
(8.7)
Where Hinsul_actual is the actual thickness of the insulation layer.
The insulation thickness between ground and cellar is labelled:
Hinsul
Concrete thickness between ground and cellar [Hmagco]: the concrete thickness between the
ground and the cellar determines the thickness of the concrete plate that lies between the cellar
and the ground. A thermal conductivity of 1.3 W/mK is assumed for this concrete. The horizontal
pipes that connect the heat exchanger piles to the pipe collectors are supposed to lie below the
concrete plate. A different thermal conductivity for the concrete (for example
"New_lambda_concrete" W/mK) can be taken into account by using formula 8.8.
Hmagco = Hmagco_actual x 1.3 (W/mK) / New_lambda_concrete
(W/mK)
Where Hmagco_actual is the actual thickness of the concrete plate.
The concrete thickness between ground and cellar is labelled:
PILESIM2 user manual
Hmagco
(8.8)