What makes a heat exchanger more efficient?

Heat exchangers all work by passing a hot fluid and a cold fluid across opposite sides of a piece of metal. High fluid velocity, high turbulence, high surface area and a large temperature differential all contribute to more efficient heat transfer.

Which is more efficient plate type heat exchanger or tube type heat exchanger?

Plate heat exchangers are up to five times more efficient than shell-and-tube designs with approach temperatures as close as 1°F. Heat recovery can be increased substantially by simply exchanging existing shell-and-tubes for compact heat exchangers.

Are plate heat exchangers more efficient?

Is concurrent or countercurrent more efficient?

When you take the LMTD (logarithmic mean temperature difference) in the 2 cases, the value is higher in a counter current flow than a co current flow. As we know that heat transfer depends largely on the temperature difference, counter current flow is better.

Are heat exchangers energy efficient?

Heat exchangers can improve a system’s energy efficiency by transferring heat from systems where it is not needed to other systems where it can be usefully used. This reduces the energy input necessary to heat the incoming fluid to working temperature.

How efficient is a shell and tube heat exchanger?

In case of the industrial heat exchanger presented in the paper, the change of flow directions in shell and tube side has been carried out in the meantime. This change actually solved the problem, and resulted in the designed performance with efficiencies around 95\%.

What is heat transfer efficiency?

In general, the efficiency of heat exchange is defined as the ratio of the amount of heat transferred in the actual case to the amount of heat in the ideal case, in the optimal case (equation below).

Is cross flow more efficient or counter flow?

In the mixing zones, the flow corresponds more or less to the crossflow, whereas pure counterflow prevails in the middle part. The length of this middle part determines the output first and foremost. This means that it is always possible to achieve the required thermal efficiency of 0.73, but this comes at a price.

Which type of heat exchanger is more efficient?

A shell and tube heat exchanger is more efficient as it can have multiple passes for the fluid to stay longer in contact with heating material (fluid in this case). Longer contact time and higher heat exchange surface area allows greater heat transfer rates which is in accordance with Nusselt ’s equation.

What is heat exchanger and how do they work?

A heat exchanger is a device that allows heat from a fluid (a liquid or a gas) to pass to a second fluid (another liquid or gas) without the two fluids having to mix together or come into direct contact.

What is a heat exchanger and what does it do?

A heat exchanger is made of thin metal, and as it heats up from the combustion of the furnace, it transfers the heat to the air being distributed through the house by the blower. When a heat exchanger becomes damaged and the combustion fumes and gases mix with the clean air, serious consequences can result.

Should I replace heat exchanger?

There are only two options if a Heat Exchanger is bad: Replace the heat exchanger or replace the furnace. If the heat exchanger is under warranty, this option is a good way to go unless it is unavailable in the time frame needed, which can be immediate in cold weather.