Thermal Storage
Detailed Ice Storage
Capacity
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Default: Autosize
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Typical Range: N/A
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Min Max: -999,999,999,999,999 < X < 999,999,999,999,999
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Units: Btu; GJ; J; kBtu; kcal; kJ; kWh; MJ; MMBtu; therms; ton-hr
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This is the capacity of the ice tank itself. This is assumed to be only the latent capacity (melting of the ice) of the tank as the program does not model any sensible capacity (change in temperature of the ice or water).
The capacity can be autosized. When it is autosized, it is calculated using the following equation:
Q = V_dot*Cp*rho*DeltaT*t
Where:
Q is the tank capacity in Ton Hours
V_dot is the volumetric flow rate of the plant
Cp is the specific heat of the plant fluid (fluid type is defined in the plant loop sizing properties)
Rho is the density of the plant fluid
DeltaT is the loop temperature difference input in the plant loop sizing properties
T is the nominal time to charge the ice tank defined in the plant loop sizing properties
Parasitic Losses
Parasitic Electric Load During Discharging
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Default: 0.0001
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Typical Range: 0 < X < 1
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Min Max: -999,999,999,999,999 < X < 999,999,999,999,999
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Units:N/A
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This accounts for any electric consumers associated with discharging the tank such as a controller for the tank. The value is a direct multiplier to the tank load at a given timestep.
Parasitic Losses During Charging
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Default: 0.0002
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Typical Range: 0 < X < 1
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Min Max: -999,999,999,999,999 < X < 999,999,999,999,999
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Units: N/A
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This accounts for any electric consumers associated with charging the tank such as a controller for the tank. The value is a direct multiplier to the tank load at a given timestep.
Tank Loss Coefficient
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Default: 0.0003
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Typical Range: 0 < X < 1
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Min Max: -999,999,999,999,999 < X < 999,999,999,999,999
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Units: N/A
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A portion of the ice in the tank will melt each hour due to imperfect insulation of the tank. This coefficient is a multiplier on the total capacity that is lost each hour. (I’m not sure if this is right, the equation used in Git is:
DetIceStor(IceNum2).IceFracRemaining += DetIceStor(IceNum2).IceFracChange - (DetIceStor(IceNum2).TankLossCoeff * TimeStepSys);
so it appears to be a multiplier on the time step which I believe is in units of time…
Tank Properties
Thaw Process Indicator
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Default: Internal Melt
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Typical Range: Internal Melt, External Melt
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Min Max: N/A
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Units: N/A
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This field describes how the ice melts in the tank. The two options are Internal Melt and External Melt. The Internal Melt option causes the ice to melt from the surface of the tubes inside the tank first and then out. External Melt causes the ice to melt from the outside of the tank first, moving its way in.
Mixed Chilled Water Storage
Stratified Chilled Water Storage
