Pillow Plates

Pillow plate heat transfer

We can calculate the needed heat exchanger surface. Generally we need the cooling or heating capacity in kW or we can calculate that from the process parameters.

The pillowplate heat exchange calculations can be divided into the following categories:
- pillowplate on the tank wall and/or bottom
- pillowplate submerged in a medium
- flow over the pillowplate (falling film), air , liquids or solids
- cold storage and release of an ice bank

Pillow plate tank wall and bottom

The final goal is the calculation of the needed square meters pillowplate heat exchange surface  for the process. Important is the location and isolation of the tank, also whether the tank is mixed or not, the liquid properties, the heated or cooled medium in the pillow plate. And of course the needed cooling or heating path. 

Pillow plate heat exchange submerged

Here the same main goal, calculation of the needed laser welded pillow plate surface, heat exchange pillowplate surface. The pillowplate calculation is based upon two sides of the pillowplate heat exchanger. Basically the needed information is almost the same as a tank wall calculation.

Flow over a pillowplate (falling film), air, liquids or solids.

The calculation of the heat transfer capacity of a falling film chiller or falling film heater is based upon known formulas. We need the main specifications of the pillowplate application. These are the heating or cooling capacity in kW, inlet and outlet temperature of the falling film product. The evaporating medium or heating medium and the temperature in the pillow plate.

Cold storage and release of a icebank

To determine the size of a icebank we need the cooling capacity needed for the process and the available space. With the ice layer thickness and the melt rate the icebank can be calculated.
Steps:
- Cooling capacity gives the needed ice quantity in kg
- With the ice layer thickness 30,  40, 50 mm,  the cooling surface is calculated
- The needed laser welded pillow plate surface is than estimated
- The plate distance is determined by the icebank layer thickness
- The ice built rate is based on the evaporating temperature and the available compressor.

Ice bank melt rate: generally a big icebank (>500 kg) can be melted in 2 hours. An mixed or air aggregated icebank delivers twice the cold capacity an hour.

General characteristics

Pillowplate / Dimple Jackets are being used in:

  • Heat / cooling of tanks, for instance beer tanks and wine tanks
  • Milk tanks (Bulk Milk Coolers BMC)
  • Falling Film Water Coolers, Ice banks, immersion Coolers
  • Warmth regeneration
rapeseed bulk solid equipment

Bulk Solid Heat Exchangers are for example being used in the production of Rapeseed, Urea, KCl.