HTRI is a leading source of process heat transfer technology, research, software, and services. Our acclaimed HTRI Xchanger Suite® software is considered the most advanced available for the design, rating, and simulation of heat exchangers.
Determine NTU. Calculate the
heat transfer surface area. Calculate the length of the tube or
heat exchanger.
For the rating analysis:
- Calculate the capacity rate ratio.
- Calculate NTU.
- Determine the effectiveness.
- Calculate the total heat transfer rate.
- Calculate the outlet temperatures.
PV Elite® is pressure vessel and heat exchanger design software is easy to learn and use. PV Elite is a complete solution for the quick and intuitive design of new pressure vessels, and it also evaluates and re-rates existing vessels, including Fitness for Service analysis.
How To Use The HTRI Interface In COMPRESS - YouTube
- To import on HTRI Xist file within COMPRESS select File HTRI Interface. [00:08]
- Click Open HTRI File. [00:22]
- A COMPRESS model is generated based on the exchanger specified in the HTRI file. [00:37]
- The data imported from the HTRI Xist file is displayed. [00:48]
- The mechanical design of the heat exchanger can now be reviewed using COMPRESS. [01:14]
The log mean temperature difference (LMTD) is used to determine the temperature driving force for heat transfer in flow systems, most notably in heat exchangers. The LMTD is a logarithmic average of the temperature difference between the hot and cold streams at each end of the 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)
Most direct contact heat exchangers fall under the Gas – Liquid category, where heat is transferred between a gas and liquid in the form of drops, films or sprays. Such types of heat exchangers are used predominantly in air conditioning, humidification, industrial hot water heating, water cooling and condensing plants.
This arrangement is what we mean by a heat exchanger: the gas jets cool down and the water heats up. 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.
Heat exchangers are most commonly found in boilers. They allow your boiler to heat the water that is then pumped through your radiators to warm your home. Let's take a closer look at how a heat exchanger works in your home's combi boiler.
Plate Heat Exchanger Working Principle. A plate exchanger consists of a series of parallel plates that are placed one above the other so as to allow the formation of a series of channels for fluids to flow between them. The space between two adjacent plates forms the channel in which the fluid flows.
Certainly the most common way to warm dinner plates. Stack plates in the oven from 140°F to 190°F (60°C to 90°C) for about 15 minutes. Be careful: avoid heating plates up to 175°F (80°C) as you can burn yourself by touching plates which are too hot.
A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. The concept behind a heat exchanger is the use of pipes or other containment vessels to heat or cool one fluid by transferring heat between it and another fluid.
Water to Water Heat Exchangers. Thermex shell and tube heat exchangers can also be used for water to water heating or cooling. They are particularly ideal for use as jacket water heat exchanger, using water glycol mixtures cooled by raw sea water.
The firebox and heat exchanger are surrounded by water or a glycol-water solution, which absorb heat from the burning wood. The heated water is generally circulated through insulated underground lines to a heating load, where the heat can be transferred from the water to various heat emitters.
