Ship's Fresh Water Cooling System | Study Call Ep 003 Chief MAKOi
Summary
TLDRThis episode of 'Study Call the Chief McCoy' delves into the freshwater cooling system of ships, essential for protecting engines from corrosion and providing clean water for crew needs. It explains the high-temperature line's role in cooling engines by transferring heat to seawater and highlights the system's components, including the expansion tank, jacket cooling water pumps, and jacket water cooler. The video also touches on the use of preheaters and the potential for a low-temperature line for auxiliary machinery, setting the stage for future discussions on central cooling systems and other maritime topics.
Takeaways
- 🚢 The ship's freshwater system is essential for cooling engines and domestic use, as seawater causes corrosion and is unsuitable for consumption or sanitation.
- 🔍 The freshwater system is divided into two subsystems: freshwater cooling and domestic freshwater, with this episode focusing on the former.
- 🛠️ Ships with diesel engines have a different freshwater cooling system configuration compared to those with steam turbines.
- 🔥 The freshwater cooling system absorbs heat from the main and auxiliary engines and transfers it to the seawater system for disposal.
- 💧 The main feature of the freshwater cooling system is the high-temperature (HT) line, which is a closed-loop system.
- 🚰 Freshwater from the expansion tank is circulated by jacket cooling water pumps through the engine cylinders to maintain optimal temperatures.
- 🔄 A temperature-controlled three-way valve redirects water flow to either return to the main engine or pass through the jacket water cooler.
- ♨️ A preheater in the HT line maintains jacket water temperature when the engine operates at slow speeds, like during maneuvering.
- 🔩 Seawater should never be used directly in the engine jacket water system due to the risk of serious corrosion damage to engine parts.
- 🌡️ Some ships may have a low-temperature (LT) line for cooling smaller machinery, which uses freshwater circulated through various coolers and heat exchangers.
Q & A
What is the primary purpose of a ship's freshwater system?
-The primary purpose of a ship's freshwater system is to provide fresh water for drinking and domestic uses, and to cool the ship's engines and machinery without causing corrosion that seawater would introduce.
Why can't seawater be used for cooling engines directly?
-Seawater cannot be used directly for cooling engines because it causes corrosion in metals like iron and steel, which are commonly used in ship construction and machinery.
How does the freshwater cooling system differ from the domestic freshwater system?
-The freshwater cooling system is designed to absorb heat from the main and auxiliary engines and transfer it to the seawater system, while the domestic freshwater system is for non-industrial uses such as drinking, cooking, and sanitation.
What is the role of the jacket cooling water pumps in the freshwater cooling system?
-The jacket cooling water pumps are responsible for circulating fresh water through the engine jackets, where it absorbs heat generated by the combustion process, helping to maintain engine temperature.
What is the function of the high-temperature (HT) line in the freshwater cooling system?
-The HT line is a closed-loop system that circulates freshwater through the engine jackets to absorb heat and then redirects the heated water either back to the engine or through a cooler to dispose of the heat.
What is the purpose of the preheater in the HT line?
-The preheater in the HT line is used to maintain the jacket water temperature when the engine is running at slow speeds, ensuring efficient heat absorption and engine operation.
How does the jacket water cooler contribute to the cooling process?
-The jacket water cooler is part of the HT line and is responsible for transferring the heat absorbed from the main engine to either seawater or freshwater, depending on the ship's configuration, to be eventually released into the sea.
What is the significance of the low-temperature (LT) line in the freshwater system?
-The LT line is used for cooling smaller machinery and systems that generate heat but are not directly involved in fuel combustion. It operates as a closed loop, circulating freshwater through various coolers and heat exchangers.
How does the central cooler in the LT line function?
-The central cooler, also known as the LT water cooler, is where the freshwater that has absorbed heat from various systems is cooled by seawater, which then carries the heat away and releases it into the sea.
What are some other components that may be connected to the freshwater system?
-Other components that may be connected to the freshwater system include air compressors, lubricating oil coolers, intake air coolers for engines, and condensers for refrigeration and air conditioning systems.
Why might the design of the freshwater cooling system vary between different ships?
-The design of the freshwater cooling system may vary between ships due to differences in engine types, ship size, operational requirements, and the specific technologies employed in each vessel.
Outlines
🚢 Freshwater Cooling System on Ships
This paragraph introduces the freshwater system on ships, emphasizing the need for a separate system from seawater due to corrosion and unsuitable use for drinking or washing. It outlines the freshwater cooling system's role in absorbing heat from engines and transferring it to seawater. The main engine jacket cooling water, also known as the high-temperature (HT) line, is highlighted as a closed-loop system starting from the expansion tank, where freshwater is circulated through engine jackets to absorb heat, then redirected through a temperature-controlled valve to either return to the engine or pass through a jacket water cooler. The HT line also includes a preheater for maintaining temperature during slow engine speeds.
💧 Low-Temperature Freshwater System and Its Applications
The second paragraph delves into the low-temperature freshwater system, which is also a closed loop with an expansion tank and pumps. It serves to cool various auxiliary systems like lubricating oil, intake air for engines, and machinery like air compressors, as well as condensers for refrigeration and air conditioning. After absorbing heat, the freshwater passes through a central cooler, also known as the low-temperature (LT) water cooler, where it transfers heat to seawater before being expelled overboard. The paragraph concludes by noting that the setup can vary between ships and hints at additional related topics to be covered in future episodes.
Mindmap
Keywords
💡Freshwater System
💡Seawater Cooling System
💡Corrosion
💡Main Engine Jacket Cooling Water Pumps
💡High-Temperature (HT) Line
💡Expansion Tank
💡Jacket Water Cooler
💡Preheater
💡Auxiliary Engines
💡Central Cooling System
Highlights
Introduction to the ship's freshwater system, essential for cooling and domestic use on ships.
Explanation of the division between freshwater cooling system and domestic freshwater system.
Discussion on the limitations of using seawater for cooling due to corrosion and unsuitable for drinking or washing.
Introduction to the freshwater cooling system's role in absorbing heat from engines and transferring it to the seawater system.
Description of the main engine jacket cooling water system, also known as the high-temperature (HT) line.
Detail on how the freshwater cooling system maintains engine temperature within the optimal range.
Explanation of the function of the jacket water cooler in the HT line and its connection to the seawater system.
Discussion on the use of preheaters in the HT line to maintain water temperature during slow engine speeds.
Introduction to the auxiliary engines' freshwater cooling system and its similarities to the main engine's system.
Highlight on the importance of not using seawater directly in the engine jacket water system to prevent corrosion.
Description of the low-temperature freshwater line (LT line) for cooling smaller machinery and systems.
Explanation of the central cooling system's use of freshwater instead of seawater in heat exchangers.
Detail on how the central cooler, connected to the seawater cooling system, absorbs heat and disposes it into the sea.
Presentation of a typical setup of the ship's freshwater cooling system and acknowledgment of design variations.
Invitation for audience suggestions on maritime-related topics for future episodes.
Transcripts
hello everyone welcome to another
episode of study call the chief McCoy in
this episode we will be talking about
the ship's freshwater system in the
previous episode we talked about the sea
water cooling system out in the ocean
sea water is the most abundant resource
we can use for cooling the engines and
washing things like the cargo holds and
other stuff but the downside is sea
water causes corrosion in metals like
iron and steel which is basically what
the ship and its machinery is made of
also the crew can't use seawater for
drinking and other domestic things like
taking a shower or washing clothes which
is why ships have a freshwater system
now for the purpose of this discussion
we will divide the freshwater system
into two subsystems the freshwater
cooling system and the domestic
freshwater system in this episode we
will only tackle the freshwater cooling
system let's leave the domestic or the
next episode
and also the system that we will discuss
today and for the succeeding episodes
will be for ships
running on diesel engines ships driven
by steam turbines have a slightly
different configuration so that's going
to be a topic for a future episode
now the freshwater cooling system is
used for absorbing the heat from the
main and auxiliary engines and transfer
it to the seawater system and eventually
they're supposed to heat out into the
sea depending on the ship's design a low
temperature line can also be installed
for cooling smaller machinery like the
air compressors but more on that later
perhaps we can say that the main feature
the freshwater cooling system is the
main engine
Jagat cooling wine otherwise known as
the HT or high-temperature line the HT
line is a closed-loop system so
technically there really isn't the
beginning or end but anyway let's start
from the expansion tank which of course
contains fresh water from there fresh
water is suction by the jacket cooling
water pumps and then delivers it to the
main engine cylinders the cylinders have
these jackets around the top part
including the cylinder cover and the
exhaust valves which is basically the
area around the combustion chamber where
obviously the heat is generated when the
engine burns fuel now the freshwater
flows through these jackets and absorbs
the heat from the metal maintaining the
temperature at around 83 to 85 degrees
Celsius after passing through the
jackets the water leaves the main engine
and goes to a junction where some of it
goes back up to the expansion tank while
some of it passes through a temperature
controlled three-way valve which then
redirects the water flow to either go
back to the main engine or pass through
the jacket water cooler where the heat
absorbed from the main engine will
eventually be disposed
I'll to see the HT line is also fitted
with a preheater which is used to
maintain the jacket water temperature
when the engine is running at slow
speeds like when the ship is
nuvaring
[Music]
a similar although smaller system is
also installed for the auxiliary engines
now based on what we have just discussed
it's pretty obvious why seawater should
never be used directly as the cooling
medium in the engine jacket water system
acid will cost serious damages to the
engine parts mainly due to corrosion as
mentioned in the previous episode the
jacket water cooler can use either
seawater or freshwater as the cooling
needed depending on whether the ship is
installed with a direct sea water
cooling system or a central cooling
system now earlier I have also mentioned
that a low temperature freshwater line
can also be installed for cooling
smaller machinery and other systems this
is the case if the ship is installed
with a central cooling system where
instead of sea water passing through the
various heat exchangers this system uses
fresh water similar to the HT line this
LT or a low temperature line this a
closed loop has an expansion tank and
gets the water circulated through the
system using pumps the fresh water
passes through all the coolers in the
various auxiliary systems like
lubricating oil and intake air for the
main and auxiliary engines and also for
machinery like the air compressors as
well as for the different condensers
like in the steam return line and the
refrigeration and air conditioning plan
basically everything that needs cooling
down that is within the low temperature
range which is to say anything that
generates heat but not directly as a
result of fuel combustion now after the
freshwater has absorbed the heat from
everything in the system to pass through
the central cooler which is sometimes
also known as the LT or a low
temperature water cooler which is
directly connected to the sea water
cooling system in here the heat will be
absorbed by the seawater and eventually
pull out through the overboard
and out into the sea
[Music]
what I am showing you is a typical setup
of the ship's freshwater cooling system
but of course the design or arrangement
may vary a little bit for every ship
there are also a few items which are
connected to the freshwater system which
I did not include yet these those items
will be the topics of future episodes if
you have any other maritime related
topics which you are interested in or
want me to discuss feel free to write it
down in the comment section below
but for now class dismissed
you
Voir Plus de Vidéos Connexes
Difference between Boiler water, Boiler feedwater & Engine cooling water/Ichem Week 1
HVAC Systems : Understanding Components and Functionality | Mr. Smart Explains!
Solar Vapor Absorption Refrigeration System (Ammonia-Water Solar Cooling System) Explained.
Combustion Chambers Part 1 - Aircraft Gas Turbine Engines #08
LINDE LIQUEFACTION PROCESS
Boiler water and Cooling Fresh Water Test Onboard// Unitor Chemicals!
5.0 / 5 (0 votes)