Company standard
Heat exchangers
Immersion heater
AB-E 32-10
2002-11-14
Replaces: Issue 2000-04-05
1 Area of application
Oil heaters to this standard are suitable for heating pressure fluids.
Table 1
Mineral oil Mineral oil HLP to DIN 51524
Emulsions HFA-E to DIN 24320
Fire resistant Water emulsions HFC
pressure fluids Phosphate ester HFD-R to VDMA 24317
Organic ester HFD-U
Triglyzerid (Rape seed oil) HETG
Fast bio degradable
Synthetic ester HEES to VDMA 24568
pressure fluids
Polyglycole HEPG
2 Model
Symbol
3 Type code
Example: Heizkoerper AB32-10 / 3 D 400
AB standard
Power code (see table 2)
Phase code
Single phase (230 V) / double phase (from 400 V) =E
Three phase (not possible with power code 4) =D
Voltage
E.g. 400 V = 400
Table 2
Heating area loading Installation possible in reservoir
Power code Power (W) 2
(W/cm ) 1) to AB-E 40-40 to AB-E 40-44
1 1000 from DN 63
2 2000 2 from DN 160
3 3000 from DN 250
4 370 from DN 63
5 740 0,7 from DN 160
6 1080 from DN 250
Bosch Rexroth AG Department: BRI/TDV3
Industrial Hydraulics Created: C. Ewald / B. Ullrich
Zum Eisengießer 1 • D-97816 Lohr am Main Examined:
Tel.: (0 93 52) 18-0 • Fax: (0 93 52) 18-29 17 Technical responsibility: BRI-AB/PMT
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AB-E 32-10 : 2002-11-14 Heat exchangers
4 Ordering example/match code
Heat exchanger, power code 1, phase code D, voltage 400 V:
HEIZKOERPER AB32-10/D400 Material no. R900024794
5 Dimensions and selection table
l1 l
l2
PG
d1
d
SW
Table 3
Power Dimensions Designation:
Material no.
code d d1 l l1 l2 SW PG Heizkoerper
1 G 1 1/2 42 400 ca. 96 25 60 11 AB32-10/1 D 400 R900024794
2 650 AB32-10/2 D 400 R900008368
G2 52 ca. 106 30 70 16
3 950 AB32-10/3 D 400 R900008369
4 G 1 1/2 42 400 ca. 96 25 60 11 AB32-10/4 E 230 R900024795
5 650 AB32-10/5 D 400 R900024796
G2 52 ca. 106 30 70 16
6 950 AB32-10/6 D 400 R900024797
6 Technical data
Working pressure: max. 2 bar
Installation: horizontal
Voltage: standard to DIN IEC 38
special voltage on request
Material: housing = steel
cover = steel zinc plated
Insulation: IP 65
Weight: power code 1 + 4 = 1,8 kg
2 + 5 = 3,0 kg
3 + 6 = 4,1 kg
Connection:
L1 L1
L2(N)1) L2
PE L3
Type E
PE
Type D
1) N = 230 V, L2 = upto 400 V
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Heat exchangers AB-E 32-10 : 2002-11-14
7 Heating area loading
Table 4
2
Heating are loading (W/cm )
Pressure fluid
non moving area moving fluid (∼2 m/s)
Mineral oil HLP 2
Oil-in-water-emulsion HFA
0,7
Water glycole HFC
Phosphate ester HFD-R 2
0,7
Organic ester HFD-U
Triglyceride HETG
0,7
Synthetic ester HEES
Polyglycole HEPG
8 Calculations
8.1 Heating
When heating the following applies: VB ⋅ c ⋅ ρ (T1 - T2)
(taken heating time into account) PW =
Z
PW = Heat input in kW
3
VB = Oil quantity in reservoir to be heated in dm
c = Specific heat in kWh/kgK 2)
3
ρ = Density in kg/dm 2)
T1 = Required fluid temperature in °C
T2 = Outlet temperature (usually the same as the ambient temperature) in °C
Z = Heating time in h
2) For values c and p see table 5
When calculating the heat input, it has to be taken into account that heat will be lost to the surrounding area
during heating.
Table 5
Specific heat c Density ρ
Pressure fluid 3
(kWh/kgK) 3) (kg/dm ) 3)
Mineral oil HLP 0,00052 0,88
Öl-in-water-emulsion HFA 0,00116 0,99
Water glycole HFC 0,00092 1,08
Phosphate ester HFD-R 0,00035 1,25
Organic ester HFD-U 0,00057 0,92
3) The values stated are approx. For exact values the fluid manufacturer should be contacted.
8.2 Temperature maintenance
To maintain a constant temperature in a system due to low ambient temperature the following applies:
QW = K ⋅ A (T1-T2)
QW = Heat input in kW.
2
K = Heat conductivity of the radiating surfaces in kW/m K.
2
A = Heat radiating from surfaces of reservoirs, components and pipework in m .
T1 = Required fluid temperature in °C.
T2 = Ambient temperature in °C.
Practicable calculation for heat radiation is:
kW kW
In still air: K = 0,01 In moving air: K = 0,02
2 2
mK mK
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AB-E 32-10 : 2002-11-14 Heat exchangers
9 Installation
The heaters are mounted horizontally in reservoirs, with a small clearance from the bottom of the reservoir
and as far as possible below the minimum oil level. The heating area must be always covered by the
pressure fluid, see pictures 1 and 2. Recommended installation dimensions for heaters to AB-E 32-10.
Picture 1 Picture 2
100 125 min. oil level
75 100 min. oil level
125
75 100
100
Valid for power codes 1 + 4 Valid for power codes 2 + 5 and 3 + 6
The heater element can be removed without having to drain the oil reservoir. The protective cover and
earth screw have to be removed to enable the element to be withdrawn.
Terminals L1, L2 (N), L3 Heater element
type D
Protective Heater element
cover Seal type E
Earth screw
Fixing screw
10 Spare parts
10.1 Heater element
When ordering the complete type code as stated on the name plate must be stated.
10.2 Protective cover seal
Power code 1, 4 = O-ring 39 x 2,5 NBR
2, 3, 5, 6 = O-ring 53 x 2,5 NBR
10.3 Thread seal
Power code 1, 4 = Seal ring 48,0 / 55,0 x 2,0 - St A – DIN 7603, Material no. R900004660
2, 3, 5, 6 = Seal ring 60,0 / 68,0 x 2,5 - St A – DIN 7603, Material no. R900004664
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