Operating instructions for S 40-3...S 150-3 series screw compressors
Page 47
Accessory equipment
5.1
BOGE Duotherm BPT
Part 5: Accessory equipment
5.1 BOGE Duotherm BPT
Function
The heat recovery system
BOGE Duotherm BPT
utilizes the heat energy re-
leased during compression to produce hot water free of charge (e.g. for pro-
duction systems or to supply a heater).
The plate heat exchanger is connected in the main stream of the hot oil. It con-
sists of stainless steel plates which are soldered together. These form two
separate ducting systems. Compressor oil and water run through these ducts
with opposite directions of flow. The hot oil transfers its heat to the colder water
through the plates.
Installation
As a rule, the plate heat exchanger is installed in the compressor in the factory
and comes equipped with all the necessary pipework. Only the following work
needs to be carried out during installation:
–
Connect the supply and discharge water pipelines to the pipeline system.
Route the pipelines to prevent stresses and vibrations from being transmit-
ted to the heat exchanger.
–
Provide venting and draining facilities.
The customer must provide the following components for installation:
–
Stop valves
Stop valves in the water supply and discharge lines enable the heat ex-
changer to be removed easily
–
Expansion vessel and safety valve.
Free-standing installation
The plate heat exchanger may also be installed as a free-standing unit or ret-
rofitted by the customer.
Normally, the plate heat exchanger is held in place by the pipelines. However,
when installing larger types of heat exchanger, the customer may have to pro-
vide a bracket.
WARNING!
If the stop valves in the water supply and discharge lines are closed simul-
taneously, an enclosed space is created. If the water in this space is heated,
it expands and the pressure increases.
An expansion vessel and safety valve must therefore be installed to prevent
the plate heat exchanger from becoming damaged.
–
Dirt trap (pore size: max. 0.02 inch).
The dirt trap at the water inlet protects the plate heat exchanger against
dirt deposits if the water is very dirty.
–
Flushing connections
The flushing connections serve to clean the plate heat exchanger.