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Juice Heater

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Juice Heaters

Because high pressure steam is very valuable, exhaust steam is often used for juice heating or, if possible, preferably bled vapour from the evaporators. It is thus necessary to have a heat exchanger between vapour and juice; this is provided by the juice heaters.

The juice heater (below) consists of an assembly of tubes; the juice circulates through the tubes, and the vapour outside them. Suitable headers force the juice to pass a certain number of times from bottom to top and from top to bottom of the heater by restricting the juice each time to a few of the tubes.

The basic calculation of the juice heater is to calculate the amount of heat transferred using the overall heat transfer co-efficient (OHTC), the log mean temperature difference (LMTD) and the heating surface area.

Values of OHTC from various sources

Source

Duty

Value

Unit

Perk, ISSCT 1962, p601

Exhaust steam

46-231

BTU/ft2/°F/h

Vapour 1

43-221

BTU/ft2/°F/h

Vapour 2

41-129

BTU/ft2/°F/h

Vapour 3

26-125

BTU/ft2/°F/h

Webre in Hugot, 2nd Ed p452

250-300

BTU/ft2/°F/h

Tromp p359

120

BTU/ft2/°F/h

Tromp p359

Quoting Cuban conditions

100-170

BTU/ft2/°F/h

Oliver Lyle EUS Table XLVII

Calorifiers - low velocity

150

BTU/ft2/°F/h

Calorifiers - high velocity

300

BTU/ft2/°F/h

Bubnik et al 1995, table 445/2

water heated by saturated steam

1.300

kW/m2K

raw juice heated by vapour

0.600

kW/m2K

1 BTU/ft2/°F/h = 5.678 W/m2K

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