Table 2 Optimization model parameters
From: District cooling network optimization with redundancy constraints in Singapore
Name | Unit | Description |
|---|---|---|
c fix | S$/m | Fixed investment costs |
c var | S$/(kW m) | Variable investment costs |
c om | S$/(m a) | Operation & maintenance costs |
c rev | S$/kWh | Revenue for cooling |
w fix | kW/m | Fixed thermal losses |
w var | kW/(kW m) | Variable thermal losses |
b | — | Concurrence effect |
q | — | Connect quota |
u | 1/a | Annuity factor for investment costs |
\(c^{\text {cool}}_{i}\) | S$/kWh | Cooling costs at source vertices |
\(Q^{\text {max}}_{i}\) | kW | Source vertex capacity |
l ij | m | Arc length |
d ij | kW | Arc peak demand |
g ij | — | Existence of a pipe (1=yes, 0=no) |
\(C^{\text {max}}_{ij}\) | kW | Maximum pipe capacity |
s t | 1 | scaling factor |
w t | h | weight/duration |
y it | — | availability (1=yes, 0=no) |