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7.1 Energy recovery systems
General
The energy recovery systems can be applied as low temperature rise/high water flow
systems or as a high temperature rise/low water flow systems.
Low temperature rise/high water flow systems
The temperature difference between the water in the energy recovery system and the
pump oil is low. A high‑water flow is necessary for maximum energy recovery.
For example, The heated water is used to keep another medium at a moderately high
temperature in a closed circuit (for example, central heating).
High temperature rise/low water flow systems
A high-water temperature increase in the energy recovery system is obtained, which
causes a low flow rate.
For example, An open circuit where cold water from the main supply is heated by the
energy recovery system to use in a factory (for example, pre‑heating of boiler feed
water).
Recovery water flow
The recovery water enters the unit at the inlet connection. In the heat exchanger, the
compression heat is transferred from the pump oil to the water. The water leaves the
heat exchanger through the outlet connection.
Water requirements for the closed water circuits
The use of a closed water circuit decreases the make‑up water requirements. The use of
soft or demineralised water is economically feasible and removes the problem of scale
deposits. The heat exchanger water circuit is made of stainless steel, the corrosion
inhibitors for the water circuit connected to the pump can be necessary. Refer to
water requirement
quality. If in doubt, contact us.
Add an anti-freeze product (for example, ethylene‑glycol) to the water in proportion to
the expected temperature level to prevent freezing.
Water requirements for the open water circuits
For open, non-recirculation water circuits the problems are related to deposit control,
corrosion control and microbiological growth control. To decrease the problems the
water must meet the requirements given in
doubt, contact us.
7.1.1 Energy recovery systems operation
The pump oil flow is controlled by the two thermostatic bypass valves for the correct
operation of the pump and optimum energy recovery.
The thermostatic bypass valve 1 and thermostatic bypass valve 2 have an insert
(thermostat) installed in a housing. The thermostatic bypass valve 1 is integrated in the
oil filter housing of the pump. The thermostatic bypass valve 1 controls the oil flow to
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Cooling water requirement
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