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Table 1 Nomenclature energy system characterization

From: Linear programming control of a group of heat pumps

Term Signification
T a Ambient temperature
T z , C z Zone (room) temperature and thermal capacity
T wo, C wo Outside wall temperature and thermal capacity
T wi, C wi Inside wall temperature and thermal capacity
T f , C f Zone floor temperature and thermal capacity
T cs Cellar or creeping space temperature
R roof Thermal resistance of roof
R window Thermal resistance of windows
R wo−a Thermal resistance between outside wall and ambient
R wi-wo Thermal resistance between outside and inside wall
R z−wi Thermal resistance between zone and inside wall
R zf Thermal resistance between zone and floor
R f−cs Thermal resistance between floor and concrete structure
q vent Ventilation heat flow
q inf Infiltration heat flow
q gain Internal gain heat flow
D c,t Heating load flow (heating Demand)
ϕ air,inf Infiltration air flow [ m 3/h]
ϕ air,vent Ventilation air flow [ m 3/h]
ρ air Air density
c p,air Specific heat capacity of air