For a residential building with 5000W of heating demand,estimate:
a)Â Â Â Â the number of required verticalground heat exchangers (borehole heat exchangers) to fulfill theheating demand (round up the number).
b)Â Â Â the heat exchange rate for each ground heatexchanger if boreholes are 30m deep (W/m).
Design parameters and assumptions:
The circulating fluid in the pipes is water with a temperaturedifference of 5°C between inlet and outlet pipes (Tout -Tin= 5°C) and Reynolds number of 5,000. Pipe outerdiameter is 25mm with 1.8mm wall thickness. Circulating fluiddensity is 1000 kg/m3, the heat capacity is 4180 J/(kgK)and dynamic viscosity of 0.001 Pa.s.
