Energy Recovery Systems - Atlas Copco GA 75 VSD Instruction Book

Instruction book
Reference
5
6
7
BV2
HE
V1
AR
OF
BV1
Field installation
The main components are assembled ex-factory as a compact unit which fits inside the bodywork of the
compressor. Consult Atlas Copco for installing and connecting the energy recovery unit.
5.2

Energy recovery systems

General
The energy recovery systems can be applied as low temperature rise/high water flow systems or as high
temperature rise/low water flow systems.
Low temperature rise/high water flow (closed water recovery systems)
For this type of application, the temperature difference between the water in the energy recovery system and
the compressor oil is low. Therefore, a high water flow is needed for maximum energy recovery.
Example: The heated water is used to keep another medium at a moderately high temperature, in a closed
circuit, e.g. central heating.
High temperature rise/low water flow (open water recovery systems)
For this type of application, a high water temperature rise in the energy recovery system is obtained, which
consequently brings on a low flow rate.
Example: An open circuit where cold water from a main supply is heated by the energy recovery system for
use in the factory, e.g. preheating of boiler feed water.
Recovery water flow
For the references, see section
The recovery water enters the unit at inlet connection (1). In heat exchanger (HE) the compression heat is
transferred from the compressor oil to the water. The water leaves heat exchanger (HE) via outlet connection
(2).
Recovery water requirements for closed water circuits
The use of a closed recirculating water circuit minimises make-up water requirements. Therefore, the use of
soft or even demineralised water is economically feasible and eliminates the problem of scale deposits.
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Designation
Oil drain plug
Oil line from compressor oil separator vessel to ER unit
Oil line from ER unit to oil filter housing
Location of heat exchanger by-pass valve (BV2)
Heat exchanger
Selector valve
Oil separator vessel
Oil filter housing
Location of oil cooler bypass valve (BV1)
Energy recovery data.
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