Environmental Engineering Reference
In-Depth Information
fl owing through the condenser. The cooled refrigerant is shunted into two parts by
pipelines. One of the streams fl ows back to the heat accumulator to complete the
power cycle while the other passes through the throttle to the evaporator, where it
performs heat exchange with the secondary refrigerant and gasifi es, turning into a
low pressure steam. So far a refrigerating cycle is completed.
It is worth mentioning that sea water or underground water can be used as cool-
ing medium in the condenser. To prevent blockage resulting in bad cooling effect,
a fi lter needs to be installed on the cooling medium carrier pipe on the way to the
condenser. In the area where water is hard to reach, the cooling medium can be the
other liquid processed by the seawater heat exchanger or the underground heat
exchanger. No matter which conditions, for those components and pipelines sub-
merged in water, effective anti-corrosion treatments should be implemented. Those
treatments include choosing the resistant material, protective coating technology
and cathodic protection technology. In the night or the abnormal working condi-
tion of the heat accumulator, an auxiliary heater can be used to heat the refrigerant
fl owing through to offset the energy shortage of the heat accumulator.
Comparing with the current wind turbine cooling system, the jet cooling system
with solar power assistant possesses many advantages, such as lower power con-
sumption, better cooling performance and environment friendly. Only the circulat-
ing pump and auxiliary heater need electricity support in the cooling system,
which enables low electricity consumption of the whole system; while the solar
power jet cooling method can obtain temperature below the ambient temperature,
which will ensure the temperature in the optimal working condition. And the
refrigerant in this system can be chosen from the non- chlorofl uorocarbons sub-
stances (NON-CFC) which will be of great help to the environment protection.
Besides, since the jet refrigerating engine has a simpler and lighter structure than
other ones in the current technology, this merit will enhance the total anti-fatigue
property of the nacelle; also because it is usually installed in the nacelle, which
will avoid the corrosion caused by blown sand and rain, the working performance
and life span will be effectively secured. Therefore, it can satisfy the highly
effi cient and dependable working requirements of the high-power wind turbine.
5.4 Heat pipe cooling gearbox
The three solutions mentioned above mainly focus on the entire cooling effect of all
the heat producing components. On the other hand, considering different structural
conditions and cooling demands of various components and using corresponding
combinatorial solutions will possibly further enhance the operating economical
effi ciency, which is also a future trend for wind turbine cooling systems. Since the
gearbox has a simple structure and an ample space for installation, a cooling solu-
tion adopting gravity heat pipe is proposed in this section while the generator and
the control converter remain adopting a traditional liquid cooling system.
As shown in Figs 16 and 17 [27], the feature of a wind turbine system adopting
a heat pipe cooling gearbox is that it has several apparatuses, including a gravity
heat pipe connected with the gearbox to refrigerate the lubricating oil in it, a
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