Two-period discharge requirement calculator

Integrate only positive load deficits when event charging is unavailable; spare chiller capacity during a lower-load interval cannot reduce prior required discharge.

Units

C = \max\left(L_{1} - Q,\ 0\right) \times t_{1} + \max\left(L_{2} - Q,\ 0\right) \times t_{2}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Worked example

Given

$L_{1}$ = 310 ton
$Q$ = 230 ton
$t_{1}$ = 4 h
$L_{2}$ = 170 ton
$t_{2}$ = 2 h

C = \max\left(310 - 230,\ 0\right) \times 4 + \max\left(170 - 230,\ 0\right) \times 2 = 320

Symbols and units

Symbol	Meaning	Unit
$C$	required discharged cooling energy	ton·h
$L_{1}$	first cooling load	ton
$Q$	chiller capacity assigned to the load	ton
$t_{1}$	first duration	h
$L_{2}$	second cooling load	ton
$t_{2}$	second duration	h

Symbol	Meaning	Unit
$C$	required discharged cooling energy	kWh
$L_{1}$	first cooling load	kW
$Q$	chiller capacity assigned to the load	kW
$t_{1}$	first duration	h
$L_{2}$	second cooling load	kW
$t_{2}$	second duration	h

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.