Question: How Can You Make A Heat Exchanger More Efficient?

What is the difference between heat exchanger and condenser?

A condenser is a device which converts vapour into the liquid state whereas a heat exchanger is a device which is used for heat recovery also to transfer heat from two fluids.

Heat exchanger only heat is transferred without phase change and heat is transferred along with the phase change in the condenser..

What advantages does the plate heat exchanger have over the tube in tube heat exchanger?

Save energy 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.

Why are heat exchangers important?

Within industrial plants and factories heat exchangers are required to keep machinery, chemicals, water, gas, and other substances within a safe operating temperature.

What is thermal efficiency formula?

where the. quantities are heat-equivalent values. So, for a boiler that produces 210 kW (or 700,000 BTU/h) output for each 300 kW (or 1,000,000 BTU/h) heat-equivalent input, its thermal efficiency is 210/300 = 0.70, or 70%. This means that 30% of the energy is lost to the environment.

Which heat exchanger is most efficient?

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.

How the flow rate affects the heat exchanger performance?

The effect of the mass flow rate at constant velocity on the convective heat transfer coefficient of an incompressible fluid in a turbulent flow regime is presented with the help of dimensional analysis. … Doubling the mass flow rate will result in a 92% increase in the heat transfer coefficient.

Which type of heat exchanger has more heat transfer for the same area?

Now for same mass flowrate and same inlet and outlet conditions of temperature the LMTD OF COUNTER FLOW HEAT EXCHANGER WILL BE MORE COMPARED TO PARALLEL FLOW HEAT EXCHANGER as the flow is in opposite direction. Hence the area for counter flow heat exchanger will be LESS compared to parallel flow heat exchanger.

What is capacity ratio of a heat exchanger?

Capacity ratio (C): It is defined as ratio of minimum to maximum capacity rate of fluids being used in a heat exchanger. as cmin = mh cph and cmax = mc cpc. The fluid with lower heat capacity rate will undergo greater change in temperature as compared to fluid with higher heat capacity rate.

Why is a countercurrent heat exchanger more efficient?

The exchanger is performing at its best when the outlet temperatures are equal. Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path.

How do I choose 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)More items…

How can the efficiency of a heat exchanger be increased?

Here are 5 proven industry practices to boost heat exchanger performance and maintain process efficiency:Online and Offline Cleaning. … Maintaining Heat Exchanger. … Periodic Cleaning. … Cleaning the PHE Manually. … Minimizing the Fouling Factor. … Analyzing and Addressing Issues in Heat Exchanger Efficiency.

What is heat exchanger PDF?

A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between. two or more fluids, between a solid surface and a fluid, or between solid particulates and. a fluid, at different temperatures and in thermal contact. In heat exchangers, there are. usually no external heat and work interactions.

What is the difference between co current heat exchanger and counter current heat exchanger?

In counter-current heat exchangers, the hot and cold fluid flow in opposite directions in the heat exchanger. This is in contrast to the co-current heat exchanger where the hot and cold fluids flow in the same direction along the length of the heat exchanger.

What is heat exchanger efficiency?

The heat exchanger efficiency is defined as the ratio of the actual rate of heat transfer in the heat exchanger, q, and the optimal rate of heat transfer, qopt,(1) η = q q opt = q U A ( T ‾ – t ¯ ) The optimum (maximum) rate of the heat transfer is the product of UA of the heat exchanger under consideration and the …

How do you test a heat exchanger performance?

The simplest indicator of the performance of a heat exchanger is the temperature change of the fluid under consideration. From our high school lessons on thermodynamics, we can recall that the rate of heat transfer is the product of the rate of heat capacity and the temperature change.