Transmission Fluids

Most of you may believe that lubrication is important to almost every mechanical part. Thus, the transmission fluid also deserves people's attention because it can provide much-needed lubrication to the complex set of gears and other moving parts in the transmission of a vehicle. Both manual and automatic transmissions need the transmission fluid to keep the proper performance.

There are two types of transmission fluid which can be widely used in the vehicles. Those are traditional transmission fluid and synthetic fluid. Although the latter type costs more than the former one, no one can give an exact answer whether the former type is better or not because they both have their own characteristics and can be applied to meet different requirements. For example, synthetic fluid should be used if you drive a high-performance vehicle under demanding conditions on a frequent basis. But in order to keep your car in a good condition, you must serve the vehicle and replace the fluid regularly whatever type of you use.

Now let us talk something about them specifically. The synthetic fluid has become increasingly popular because it doesn't lose its viscosity or coating ability. Moreover, it is also able to transfer heat more evenly for longer periods of time.

Generally, it is man-made, produced from refined oils treated with a variety of chemical additives. As is mentioned before, it can retain their viscosity longer than conventional fluids; as a result, you do not have to change them frequently.

Traditionally, transmission fluid has been petroleum-based. In manual transmissions, the biggest problem is fluid contamination either due to oxidation or friction between the moving parts that shear minute metal particles into the fluid.

Diesel Engines

Attempting to start Diesel engines in cold or sub zero temperatures is extremely difficult and usually an impossible task, unless appropriate accessories has been added to the engine to assist in such starting.

The hard starting problems of diesel engines in below zero / freezing temperatures are caused by two factors. One is the initial cold air being drawn into the turbocharger and compressed into the engine's cylinder head. The second is the fuel itself, is also cold and this sub zero / freezing temperature fuel is sprayed into the cold engine's combustion chamber, where it mixes with the cold air drawn thru turbocharger.

Additional problems will result from fact that a cold starting diesel engine needs to reach at least two hundred (200) rpm to develop a four hundred (400) psi compression pressure to sufficiently compress the air to fuel mixture, and thus, resulting in combustion.

These two problems will result in the diesel fuel being sprayed into the combustion chamber, and it will condense on the cold surfaces of the cylinder liners or cylinder block. This liquid fuel will seep through the piston rings, and fall into the engine's crankcase, diluting the lubricating oil in the process.

Two simple devices can be used to reduce the possibility that these conditions occur. One is by the use of battery heaters and glow plugs. No one device can be used. Usually a combination of several devices will provide an overall efficient starting process.

The efficiency of a battery drops as its temperature drops. A battery that is fully charged at 26 degrees C (80 degrees F) will have its starting capacity drop to approximately forty six percent (46%) available power at 17.7 degrees C below 0 (0 degrees F). Additionally, at this temperature, the engine will be approximately two and a half (2.5) times harder to start at -17.7 C (0 F) degrees due to thicker oil and resistance to movement of internal moving parts. This gets worst at lower temperatures are experienced.

To solve this, one of two common devices is used to heat the battery. One is a padded silicone covered, acid resistant rubber hot pad heater. This operates off of 110/120V and comes in various wattages. The power range can be 60W to 500W, and this can be used to heat the batteries, engine oil pan, fuel tank, hydraulic tank, and the water tank.

Thermal Flow Meter

When performing on-site analysis in the processing plant or similar environment, there are various different ways and approaches that must be employed in order to arrive at the desired result. This should not come as much of a surprise since different plants serve a number of different purposes. As such, it is best to look towards the most comprehensive approach to the operation of the processing system as possible. That means a variety of equipment will need to be installed in order to ensure that the pipeline or vessel transporting liquids will operate in a full service manner. Of the many varied items a processing engineer requires, thermal flow meters serve some of the most helpful functions.

For those curious as to what purpose these devices actually perform, here is a brief overview: they are intended for the purpose of measuring the flow of a fluid by way of examining the thermal properties of the fluid. This is done by examining a controlled and measured amount of heat to the fluid. (Hence, this is where the term thermal derives from) A sensor will then log the results which can be reviewed by the Engineer or operative. The results of this review can then be weighed for a variety of different purposes and results.

While some may assume that the development of thermal flow meters is the result of new advancements in engineering and associated industries, the origin of this type of equipment actually dates back to the very early part of the 20th century. Of course, there have been many modern advancements made in the development of this particular device. This has allowed it to achieve a level of accuracy and function that adds a level of confidence to the process that would not have been possible without such technological achievements.

The engineering and processing industries are fields that are always growing and innovating. The equipment used in these areas often follow suit quite rapidly. That is why there is such great success in the development of systems such as thermal flow meters. They are able to take an age-old concept or system and effectively update it in such a way that it delivers a great help to all manner of relevant environments. To say this delivers a great value to this environment would be tremendous understatement and most Processing and engineering personnel are grateful that such advanced systems exist to aid them in their work.

There are two different methods that thermal flow meters employ to deliver on their intended results. The first process is known as a constant temperature differential approach and the other is a constant current system. The former system employs measurements of heat and gas while the latter method measures heat and the heat of a particular flow stream. Is one better than the other? Honestly, the issue is not whether one is better than the other as much as certain systems are more appropriate for some labs than others. In general, both serve their prime purpose well.

Thermal Mass Flow Technology

Thermal Mass Flow (TMF) technology uses thermodynamic principles to drive actual mass flow. A thermal mass flow sensor can be combined with an integral valve and PID flow controller in one compact, efficient instrument that can accurately control the flow of gases and liquids over a wide range of flow rates.

A pressure sensor can be mounted in place of a flow sensor for applications requiring pressure control. Thermal mass flow products exhibit high repeatability and accuracy, providing an effective way to ensure a reliable and stable process.

HERMAL ENGINEERING IN POWER SYSTEMS

Heat Transfer series looks at the research and development in thermal engineering for power systems that are of significant importance to many scientists who work in power-related industries and laboratories. To be competitive in today's market, the editors say, power systems need to reduce operating costs, increase capacity, and deal with many other tough issues. Among the topics the book covers are: relevance of heat transfer and heat exchangers for development of sustainable energy systems; advanced technologies for clean and efficient energy conversion in power systems; virtual engineering and the design of power systems; and innovative gas turbine cooling techniques.

Aluminum Fabrications

Aluminium fabrication is a challenging task indeed. The special properties of aluminium often pose some serious challenges even to the most experienced welders. For example, aluminum is a very well conductor of heat. At the same time, it has a low melting point. Naturally, it becomes difficult to weld the aluminium sheet without burning at least some portions of it. Also, there are some impurities involved in the aluminium which is important to be got rid of. At the same time, one should preheat the aluminium sheet to ensure that the welding is done properly without any chance of cracks.

Regarding all these actions, the push technique is often considered preferable for the experienced professionals. This is basically the technique pushing the gun away from the welding puddle instead of pulling it towards it. The process ensures better cleaning actions, improved shielding gas coverage and reduced weld contamination. Anyways, it is important that the entire welding is done quickly. Since the thermal conductivity of aluminum is high, you need to use higher voltage and amperage settings. Also, you have to have high weld travel speed to ensure that the work is done during the right temperature.

When it comes to shielding gas for aluminum welding, the argon is the most popular option. This is largely because of its ability to clean and penetrate. However, if someone is welding 5XXX series of aluminum alloys, the use of a mixture of argon and helium is preferred. This will reduce the formation of magnesium oxide in the welding process.

Another tricky task for aluminum welding is to select the welding filler wire. Ideally, you should pick up a wire that has a very similar melting point to the base material. This is crucial, the narrower the gap between the filler and the base material, the easier the process will be. Also, you should prefer a wire with a large diameter.

One of the greatest challenges with the aluminum welding is the crater cracking. In fact, this is the most common factors that cause failure in aluminum welding. The crack occurs largely because of the higher rate of thermal expansion of aluminum. However, the risk is even greater when you are welding the concave craters as their surface tears at the time of contraction. Therefore, the welder must ensure that a convex or mound shape is developed during the welding. This will compensate the amount of contraction at the time of cooling down. Finally, you should always choose the power source tool according to the method of transfer spray arc.

Types Of Pressure Vessels

When a container is pressurized then pressure is exerted against the walls of the vessels. Pressure is always normal to the surface regardless of the shape. Pressure vessel is a container that has pressure different from the atmospheric pressure. There are many types of pressure vessel they are; thin walled, thick walled, strong tanks, transportable containers, propane bottles and gas cylinders. Pressure vessel is a container that holds liquid, vapor or gas at different pressure other then atmospheric pressure at the same elevation. Generally, a pressure vessel is considered to be thin-walled if its radius is larger than 5 times its wall thickness. Under this condition, the stress in the wall may be considered uniform. Thin wall pressure vessels are in fairly common use. There are two specific types of pressure vessels they are; cylindrical pressure vessels and spherical pressure vessels. Under this condition, the stress in the wall may be considered uniform. The stress in thin walled vessel varies from a maximum value at the inside surface to a minimum value at the outside surface of the vessel. Storage tanks are a category of thin walled pressure vessel.

A thick walled pressure vessel is the one that its wall is 10 % thicker than inside diameter. Thick walled pressure elements working in high temperatures in power stations, chemical and petro chemical industries are subjected to damage as a result of high temperature, mechanical loading and corrosive environment. These factors cause thermal fatigue, creep-fatigue and other processes leading to degradation. When subject to internal and external pressure stress and strain exist in thick walled pressure vessel. They have high tensile strength and can withstand maximum stress.

Transportable containers are the most common pressure vessel and potentially the most ignored type. These are mass produced and require testing every 10 years for propane and gas. Steel pressure vessels are designed to perform the dual purposes air storage and partial separation of moisture. These are provided with all standards so as to operate safely. Pressure vessels have to be designed to perform efficiently at high pressure. Pressure vessel must be free of any cracks or leakages, thereby ensuring complete safety to the surrounding environment. Cracked and damaged vessel may result in leaks or rupture failure. Rupture failure may cause considerable damage to life and property. The safe design, installation, operation and maintenance of pressure vessel in accordance with appropriate codes and standards are necessary for workers safety and health.

Thermodynamics: Basic Terms

Thermodynamics:  The branch of science that deals with the study of different forms of energy and the quantitative relationships between them.
System:  Quantity of matter or a region of space which is under consideration in the analysis of a problem.
Surroundings:  Anything outside the thermodynamic system is called the surroundings. The system is separated from the surroundings by the boundary. The boundary may be either fixed or moving.
Closed system:  There is no mass transfer across the system boundary. Energy transfer may be there.
Open system:  There may be both matter and energy transfer across the boundary of the system.
Isolated system:  There is neither matter nor energy transfer across the boundary of the system.
State of the system and state variable:  The state of a system means the conditions of the system. It is described in terms of certain observable properties which are called the state variables, for example, temperature (t), pressure (p), and volume (v).
State function:  A physical quantity is a state function in the change in its value during the process depends only upon the initial state and final state of the system and does not depend on the path by which the change has been brought about.
Macroscopic system and its properties:  If as system contains a large number of chemical species such as atoms, ions, and molecules, it is called macroscopic system. Extensive properties: These properties depend upon the quantity of matter contained in the system. Examples are; mass, volume, heat capacity, internal energy, enthalpy, entropy, Gibb's free energy. Intensive properties:  These properties depend only upon the amount of the substance present in the system, for example, temperature, refractive index, density, surface tension, specific heat, freezing point, and boiling point.
Types of thermodynamic processes:  We say that a thermodynamic process has occurred when the system changes from one state (initial) to another state (final).
Isothermal process:  When the temperature of a system remains constant during a process, we call it isothermal. Heat may flow in or out of the system during an isothermal process.
Adiabatic process:  No heat can flow from the system to the surroundings or vice versa.
Isochoric process:  It is a process during which the volume of the system is kept constant.
Isobaric process:  It is a process during which the pressure of the system is kept constant.
Reversible processes:  A process which is carried out infinitesimally slowly so that all changes occurring in the direct process can be exactly reversed and the system remains almost in a state of equilibrium with the surroundings at every stage of the process.

What Goes Around Comes Around Thermal

I’ve spent a lifetime committed to helping others. It’s what gives me the greatest joy, fulfillment and satisfaction in life. I’m also a true believer in the old adage - “What goes around comes around.” 

This is reinforced on many occasions when I encounter an old co-worker, friend or acquaintance who reminds me of how I inspired them, gave them guidance or helped them through a difficult time. These kinds of experiences always motivate me to keep putting good things out into the world. 

We never know in advance what good may come from the gestures we put out there. Maybe it will inspire, encourage, educate, motivate or actually change someone’s life. In any event, people will always come away knowing that they matter to you. 

In business, as in life, it all comes down to people. People are your customers, co-workers, employees, leaders, managers, investors and vendors. Success in your business depends on the people you encounter. How you treat those people will have a significant impact on your bottom line. 

Here are some ways to help people in your business and show them that they matter: 

1. Deliver incredible customer service. 
2. Give a single parent the afternoon off. 
3. Pay someone more than you need to. 
4. Send a hand-written note to an employee acknowledging a job well done. 
5. Loan a subordinate a book that you’ve found to be helpful. 
6. Tell someone struggling “I want to help you succeed,” and mean it. 
7. Stop by and talk, without an agenda. 
8. Share a resource that you’ve found useful. 
9. Create a safe space for openness and honesty. 
10. Let people tell you how they feel, and listen without interrupting. 

I encourage you to think about the people that you impact, the lives that you touch and the positive changes that you can make. These are the true signs of leadership and in my opinion are more important than the money that you make, the position that you hold or the size of your office. 

You can do good while you’re doing well. It may require you to think of new ways to do it, but when you focus on helping others, you’ll succeed in ways beyond measure. 

Combined cycle power plant

 combined cycle power plant is more efficient than a conventional power plant because it uses a higher proportion of the energy that the fuel produces when it burns.

In a combined cycle power plant (CCPP), or combined cycle gas turbine (CCGT) plant, a gas turbine generates electricity and the waste heat is used to make steam to generate additional electricity via a steam turbine; this last step enhances the efficiency of electricity generation. Most new gas power plants in North America and Europe are of these types.

The Integrated Gasification Combined Cycle, or IGCC, is a process that turns coal into gas known as synthesis gas (syngas) before it is burnt. The impurities in the syngas, like CO₂, can also be removed before it is burnt.

The syngas is often used to power a gas turbine generator for electricity whose waste heat is passed to a steam turbine system. If CO₂ is removed before burning (pre-combustion) it can be stored in deep geological formations..