Refrigeration Pull-Down Time

Estimated pull-down time of a refrigerated hold given initial/target temperatures, cargo mass and cooling capacity.

RefrigerationPulldownReefer

Cargo + hold masstEffective cpkJ/kg·KInitial temp°CTarget temp°CCooling capacitykWHull heat ingresskW

Net cooling: 260kW

Sensible heat to remove: 183,750MJ

Pull-down time: 0.2h

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

t = \frac{m \cdot c_p \cdot \Delta T}{\dot Q_{net}}

Symbol	Meaning	Unit
$m$	Cargo mass	t
$c_p$	Effective specific heat	kJ/kg·K
$\dot Q_{net}$	Net cooling rate	kW

Source: ASHRAE Refrigeration Handbook

In short

Estimated pull-down time of a refrigerated hold given initial/target temperatures, cargo mass and cooling capacity.

Learn the theory Marine Auxiliary Engines and Generators