The main factors affecting the performance heat exchanger tubes include:
fluid velocity, tube diameter, converter tube shape (U or cross shape)
, converter layout order (horizontal or vertical), and Venting valve, material of tube sheet and channel and location order of input channel.
On what factors effectiveness of heat exchanger depends?
Effectiveness of the heat exchanger depends on
the thermal conductivity and convective heat transfer coefficient of the fluid
.
What affects heat exchanger efficiency?
Heat exchanger efficiency is highly affected by
the velocity of the operating fluid
so it is recommended that the flow rate should be increased from time to time. The increased turbulence works to retard fouling tendencies that otherwise impact heat exchanger performance and impede the flow of fluids.
What are 3 factors that would affect the heat transfer capacity of a heat exchanger?
Factors that affect rate of heat flow include
the conductivity of the material, temperature difference across the material, thickness of the material, and area of the material
. Different materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.
What are the factors affecting heat?
- Air temperature. This is the temperature of the air surrounding the body. …
- Radiant temperature. Thermal radiation is the heat that radiates from a warm object. …
- Air velocity. …
- Humidity. …
- Clothing insulation. …
- Work rate/metabolic heat.
How can we increase the efficiency of heat exchanger?
One simple and obvious solution for increasing shell-and-tube heat exchanger performance might be
to switch the shell-and-tube fluids
. The placement of the process fluids on the tube or shell side is usually not dependent on the most efficient heat transfer area. A primary concern is pressure.
How the flow rate affects the heat exchanger performance?
In other words, the rate of heat transfer is
directly proportional to mass flow rate
. If you increase the flow rate, you will then increase the rate of heat transfer. … Then, from the relationship above, increasing the mass flow rate must result in a smaller delta T because Q remains constant.
Can the effectiveness of a heat exchanger be greater than one?
The ratio of actual heat transfer rate to the maximum possible heat transfer rate
is known as the effectiveness of heat exchanger. The heat transfer effectiveness is always less than the actual heat transfer.
How do you determine the effectiveness of a heat exchanger?
Fig.
The effectiveness (ε) of a heat exchanger is defined as
the ratio of the actual heat transfer to the maximum possible heat transfer
. Qmax is the minimum of these two values i. e.
How do you calculate effective heat exchanger?
If one of the fluids is undergoing a change of phase throughout the entire heat exchanger and at a constant temperature (i.e. heat capacity is infinite), the thermal efficiency is simply
Eff=1-exp(-U.A/Cmin)
, where Cmin is the heat capacity (m x cp) for the single phase fluid, U-overall heat transfer coeffcient and A …
What is heat and the factors that affect heat transfer?
The rate at which an object transfers energy by heating depends on:
the surface area, volume and material of the object and the nature of the surface with which the object is in contact
. The bigger the temperature difference between a body and its surroundings, the faster the rate at which heat is transferred.
Which mode of heat transfer does not require a medium?
Transfer of heat by
radiation
does not need any material medium. Energy from the sun comes to us by radiation.
Which factors affect heat transfer between a warm and a cool substance?
The amount of time of contact, the area of contact, and the specific heals of the substances
, the factors affect heat transfer between a warm and a cool substance. Explanation: Heat transfers from a very hot body always, and into a colder body.
What are the three factors that affect heat?
There are numerous factors that affect heat flow including:
material conductivity, temperature difference between materials, material thickness and material surface
. Different materials have a greater or lesser resistance to heat transfer, making them more insulating or better conductors.
What two factors that affect heat energy?
The thermal energy of an object depends on
its temperature and mass
. The higher the temperature of a substance, the more thermal energy it has. For the same temperature, a substance with a higher mass will also have more thermal energy.
Which material absorbs more heat?
Known (sensibly enough) “sensible heat materials,” substances like
stone, cast iron, and aluminum
get noticeably hotter as they absorb heat.
