Field installation
The main components are assembled ex-factory as a compact unit which fits inside the bodywork of the
compressor. Consult your customer centre for installing and connecting the energy recovery unit.
10.1.2 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 systems
For this type of application, the temperature difference between the water in the energy recovery system
and the compressor oil is low. As a consequence, 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 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 a factory, e.g. pre-heating of boiler feed water.
Recovery water flow
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).
Water requirements for closed water circuits
The use of a closed 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. Although the
heat exchanger is made of stainless steel, the water circuit connected to the compressor may require
corrosion inhibitors. If in any doubt, consult your customer centre.
Add an anti-freeze product such as ethylene-glycol to the water in proportion to the expected temperature
to avoid freezing.
Water requirements for open water circuits
For open, non-recirculation water circuits, the major problems usually encountered are related to deposit
control, corrosion control and microbiological growth control. To minimize these problems, the water
should meet a number of requirements. If in any doubt, consult your customer centre.
Instruction book
2920 7101 41
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Summary of Contents for CPC 40 G
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