Quick Answer: How Do You Select A Heat Exchanger?

What is the most effective heat exchanger?

Plate exchanger is the most efficient due to turbulent flow on both sides.

High heat-transfer coefficient and high turbulence due to even flow distribution are important.

However, a plate heat exchanger regenerator is restricted to low viscosities.

With high viscosities, a special tubular may be required..

How do you size a heat exchanger?

ΔTm =ΔTm = … = 94.9 °F. 0.10536.The preliminary area estimate of the heat exchanger can now be calculated as: A = Q / (U x ΔTm) =A = 2, 035, 000 Btu/hr.= 178.7 ft² (120 Btu/h.ft².°F).(94.9°F)The required mass flow rate of water can be calculated from Q = m.Cp. ΔTm: Rearranging:m = Q…… = Cp x ΔTm.m = (2,035,000 Btu/hr)

Is boiler a heat exchanger?

A boiler works by using hot gas to heat water – and a heat exchanger is what allows this to happen. … A condensing gas boiler is able to recycle this heat from the waste gases and use it to heat the water. Condensing gas combi boilers used to have two heat exchangers, as it’s thought that this was more efficient.

What is difference between condenser and heat exchanger?

While a heat exchanger can regulate process temperatures independently, a condenser is a component of a chiller system (water-cooled or air-cooled) which functions to remove heat generated by an industrial or commercial process.

What is the function of a heat exchanger?

Heat exchangers are integral parts of fuel cell systems for thermal management functions related to heating of incoming gas streams, exchange of heat from various flow streams and maintenance of the uniformity of temperature.

Are stainless steel heat exchangers better?

Stainless steel heat exchangers are more expensive than aluminum, which is lightweight and has high thermal conductivity, but due to the longevity and corrosion resistance of stainless steel, they are likely to be a much better value in the long run.

What are the main selection criteria of a heat exchanger?

The following criteria can help in selecting the type of heat exchanger best suited for a given process: Application (i.e. sensible vapor or liquid, condensing or boiling) Operating pressures & temperatures (including startup, shutdown, normal & process upset conditions)

What are different types of heat exchangers?

Types of Heat ExchangersShell and tube heat exchangers.Double pipe heat exchangers.Plate heat exchangers.Condensers, evaporators, and boilers.

What is mean by heat exchanger?

A heat exchanger is a system used to transfer heat between two or more fluids. … Another example is the heat sink, which is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant.

How do you calculate the flow rate of a heat exchanger?

Using the equations, UA/(mccpc) = (Tc2- Tc1)/LMTD and UA/(mhcph) = (Th1- Th2)/LMTD , where A is surface area, 3.1417 do L , mc mh, cpc, cph are mass flow rates and specific heats of cold and hot fluids 9determined by temperatures of fluid at bulk temperatures from data book, mass flow rates can be determined.

How do you calculate the heat duty of a heat exchanger?

How to calculate the heat duty for heat exchangers?Heat Duty (Sensible heat – No phase change) Q = M * Cp * ∆T. Where; … Heat Duty (Latent heat – Phase change) Q = M * λ Where; … Heat Duty for Multiphase streams. If you have a stream where more than one phase exists then you can calculate the heat duty using the equation below: Q = Qg + Qo + Qw.

What are the two types of heat?

Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation). Heat is usually transfered in a combination of these three types and seldomly occurs on its own.

What type of flow has better heat transfer in a coil?

Each of the three types of heat exchangers (Parallel, Cross and Counter Flow) has advantages and disadvantages. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area.

What is effective heat exchanger?

Effectiveness of a heat exchanger. The effectiveness (ϵ) of a heat exchanger is defined as the ratio of the actual heat transfer to the maximum possible heat transfer.

What are the 4 types of heat transfer?

Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling.

What is the difference between double pipe and shell and tube heat exchanger?

A simple form of the shell and tube exchanger is the Double Pipe Exchanger. This exchanger consists of a one or more tubes contained within a larger pipe. In its most complex form there is little difference between a multi tube double pipe and a shell and tube exchanger.

How do you calculate the number of passes on a heat exchanger?

The number of passes in a heat exchanger is generally determined by the total flow of tube side fluid, the exchanger area requirement, allowable pressure drop and any limitations in tube length (location, access, bundle pulling requirements, etc).

What is the most common type of heat exchanger used in the process industries?

The shell-and-tube heat exchanger is probably the most common type found in industry. It is widely used in the process industries as well as in many types of HVAC equipment.