How to Select Diesel Generator for High Rise Building
by Starlight Generator dieselgeneratortech1.Setting principles of
diesel generators
The
design of power supply in high-rise buildings, firstly must ensure under what
situations should install diesel generators. Let's start with the load of
high-rise buildings and so on.
A.Fire
pumps, smoke control and exhaust facilities, fire elevators, emergency light
and other fire-fighting power supply in high-rise buildings, according to local
regulations, the first class of high-rise buildings should be supplied power
with according to the one load requirements, and the second class of high-rise
buildings should be supplied with electricity according to the two load
requirements.
B.According
to regulations of "Code for Electrical Design of Civil Buildings", in
high-rise buildings, many parts of the load is one load, such as elevator power
of the banquet hall, entertainment hall, hotel rooms, kitchens and important
office buildings, main office, conference room lighting, business hall lighting
of large department stores. And some parts load is two load, such as escalators
in department stores, elevator power, main office and conference room lighting
in ministry and provincial office buildings, etc. The load also contains other
important loads, such as important transportation hubs, communication hubs and
public places where a large number of people are often used for important international
activities.
2.The load should be
shared by two power sources.
When
there is a suitable choice, second load also is powered by two return circuits,
especially for the second load of fire power supply, it should supply power
according to the requirements of the two loops of the second load. It can be
seen that high-rise buildings require high reliability of power supply, which
requires two power supply. Therefore, the principles for considering
installation of diesel generator set are as follows:
A.For
high-rise buildings which can provide two independent power sources for power
grid, the requirements of two loads have been met according to the
specifications. In principle, do not nee to install diesel generator set.
However, for particularly important high-rise buildings (such as super
high-rise buildings), there are special important loads in the interior. When
the power system is overhauled or malfunctioned, the serious situation of
another power system malfunction should be taken into account. At this time,
diesel generating sets should generally be set up as emergency power supply.
B.For
high-rise buildings where the local power grid can only provide circuit power,
or where it is difficult or unreasonable to obtain two power sources, diesel
power generators should be set up to provide two power sources. At this time,
diesel generator set is used as standby power supply, not only for emergency
use.
C.It
is worth mentioning that in some high-rise buildings, even if the power supply
of the city network is quite reliable and can meet the requirements of the
specifications, self-contained emergency generating sets also need to set up,
so that when the power supply of the city network is interrupted, the need for
fire fighting and power consumption during the power outage can be guaranteed,
and the basic order of the building can be maintained.
3.Capacity selection of
diesel generator sets
In
generally choose 20kw to 2400kw. There are many brands: Cummins, Volvo,
Perkins, Deutz, Doosan, Ricardo, Shangchai, Yuchai, Weichai etc. If you do not
know to choose which brand, we can recommend one for you according to your
requirements.
4.Selection of diesel
generator set type
There
are three starting modes for diesel engine:
A.Manual
starting mode. It means that start up diesel genset by hand.
B.Electric
starting mode. Using motor as power and driving crankshaft by transmission
mechanism, the diesel genset can be started. The power used for electric
starting is battery, and the voltage is generally 24V. This type is the most
used.
C.Compressed
air starting mode. The compressed air into the cylinder of the diesel engine,
using its pressure to drive the piston, so that the crankshaft of the diesel
engine rotates, when the fixed speed is reached, stop air, and inject fuel into
the combustion chamber, the diesel engine can be started. When the automatic
signal is used to control the starting motor or the compressed air valve, and
measures are taken for the lubrication system and cooling system, the diesel
generator can start itself.
Electric
starting mode should be adopted in high-rise buildings, and compressed air
starting mode should be avoided. Diesel generator set with self-starting device
must be selected in high-rise buildings of Class I. When the power supply of
city power network is interrupted, the power supply must be within 15 seconds
(30 seconds required by high-level regulations). When conditions exist in the
second-class high-rise buildings, self-starting diesel genset should also be
used, and when difficulties arise, the manual starting device can also be used.
5.Diesel generators
speed
Diesel
generating sets are classified into three categories according to speed: high,
medium and low. High-speed (> 1000 rpm); medium speed (> 300-1000 rpm);
low speed (> 300 rpm). High-speed units with rotational speeds of 1000-1500
RPM should be selected in high-rise buildings, this kind of generator has the
advantages of small size, light weight and reliable operation.
6.Cooling way
During
diesel engine working, due to the combustion of diesel oil produces high
temperature, in order to ensure that the heating parts and supercharger shell
of diesel engine are not affected by high temperature, and to ensure the
lubrication of each working face, it is necessary to cool the heating part.
There
are two cooling modes of diesel engine: water cooling and air cooling. Water
cooling means cooling cylinder with water and air cooling means cooling
cylinder with air. Water-cooled generators are divided into closed
self-circulating water cooling units and open circulating water cooling units.
In high-rise buildings, the diesel generator set with closed water circulation
cooling mode should be chosen in general, which occupies a small area and
space.
7.Excitation system
Excitation
system is the main component of generator. There are many kinds of excitation
devices. Brushless automatic excitation devices are usually chosen in high-rise
buildings. The advantage of this excitation method is that when used in
conjunction with the automatic voltage regulator, the static voltage regulation
rate can be guaranteed to be within +2.5%. This type of generator can adapt to
various operation modes, and is easy to realize the automation of the unit or
remote control of the generating set.
After
you learn this article, i believe you have known to choose which type of diesel
generator. If you still have confusion, you can contact us by
sales@dieselgeneratortech.com. We believe we can let you do not have any
trouble during use diesel generator.
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Created on Sep 12th 2019 02:22. Viewed 294 times.