Geothermal Heating

The systems that are usually used for exchange of heat to and from liquids, gases, solid particle streams and vapors are known as heat recovery systems. There are many factors that control the selection of these systems. These factors include maximum and minimum temperatures, limitations of the fluid used, available equipment size and operational pressure.

Let us discuss the types of heat recovery systems. The first in the list is Heat pipe heat exchanger.

A heat pipe refers to a sealed, liquid evaporation condensing system which is cylindrical in shape. The heat from the hot incoming gas is transferred to the evaporator of the heat pipe.

Further, there is an increase in local vapor pressure and the evaporated fluid flows to the condenser section. The liquid condenses and the heat is transferred to the cold gas. This is because the vapor pressure is lower in this area. Then the liquid returns to the evaporator by a combination of gravity and capillary action.

The advantages of these systems include uniform heat delivery due to rapid heat transfer and it works up to 300 decrees C.

The next system is run-around coil which is an indirect heat exchanger between two fluids that are some distance apart. This is an effective way to connect pipe work that carries a liquid usually water or glycol. The heat exchangers in this system are fitted into ductwork and joined with a circulating pump by pipe work.

The advantages of this system are 40% to 60% efficiency in the recovery of heat. It does not require re-routing of duct work. Nor does it involve any risk of cross contamination since an intermediate fluid is used.

Another system is rotary regenerator. This is a gas to gas rotating heat exchanger which transfers energy to a supply gas from an exhaust. Two adjacent ducts are spanned by the heat wheel. One of the ducts carries the incoming gas and the other carries the exhaust gas.

The advantages of these systems are that they recover 65% of heat if the exhaust and supply flow rates are equal. They can be cost effective in ovens, paper drying, furnaces and HVAC systems.

The last system that we are going to discuss is the plate heat exchanger. This system is one of the most cost effective and compact system. It involves liquid to liquid heat exchange. Each plate in the system is separated by a gasket. The streams flow via alternate passages. Turbulent flow is induced due to geometric design of the plate which further results in high heat transfer.

The advantages include it's operation at 500 degrees Celsius, has high thermal efficiency, has a large heat exchange area and handle high pressures.

These are the some of heat recovery systems with their advantages. With this information, you can choose easily among these options and touch down on the perfect choice.

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