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Heat Exchangers - Prices from £19.95 + Delivery.
What are Heat Exchangers?
A heat exchanger is a device that causes heat transferrence from one medium to another. This could be through a solid wall to turn cold air hot.
Types of Heat Exchangers are widely used in domestic and industrial situations. They would include power plants, petroleum refineries, chemical plants, petrochemical plants, and natural gas processing, space heating, refrigeration or air conditioning. The radiator in a car is one typical example of a heat exchanger in a car. The cool air flows through mesh of the radiator and works together with a coolant such as antifreeze to cool the engine .
Flow Arrangement
There are various ways that Heat exchangers operate. There are parallel-flow heat exchangers, where the two fluids enter the exchanger at the same end, and travel parallel to one another from start to finish. Heat exchangers that cause the fluids to enter the exchanger from opposite ends are called counter-flow. This design is most efficient, as it can transfer the most heat. Yet another type of heat exchanger allows fluids to travel perpendicular to one another through the exchanger. This is known as a cross-flow heat exchanger.
Heat exchangers are designed to efficiently make full use of the surface area of the wall between the two fluids, while minimizing resistance to fluid flow through the exchanger. Fins or corrugations in one or both directions effects the exchanger's performance can affect its performance by increasing surface area and may channel fluid flow or induce turbulence.
A means temperature can be defined even if the driving temperature across the heat transfer surface varies with position. Simple systems like the log mean temperature difference (LMTD) is not available and the NTU method is used.
HVAC Air Coils
Another typical use for heat exchange is for air conditioning of vehicles and buildings. This class of heat exchangers is commonly called HVAC (heating, ventilation, and air conditioning) air coils, or just coils due to their snake like internal tubing. Air-to-liquid or Liquid-to-air HVAC coils are normally found to be of a modified cross flow arrangement. In vehicles, heat coils are often called heater cores.
The liquid used in heat exchangers can be the common fluids such as water, steam, a refrigerant or a water-glycol solution. For cooling coils, refrigerant and chilled water are most common. Chilled water is supplied from chillers that is potentially located very far away, but refrigerant must come from a nearby condensing unit. When a refrigerant is used, the cooling coil is the evaporator in the vapour-compression refrigeration cycle. HVAC coils that use this direct-expansion of refrigerants are commonly called DX coils.
On the air side of HVAC coils a significant difference exists between those used for heating, and those for cooling. Due to psychometrics’, air that is cooled often has moisture condensing out of it, except with extremely dry air flows. Heating air increases that airflow's capacity to hold water. For that reason heating coils need not consider moisture condensation on their air-side, but cooling coils must be adequately designed and selected to handle condensation.
In colder climates climates, water or steam HVAC coils can be exposed to freezing conditions. Water expands when frozen, which can cause damage or destruction and lead to replacing expensive and difficult to replace thin-walled heat exchangers as a result of just one freeze. This freeze protection of coils causes such a major concern for designers, installers, and operators of HVAC .
Indentations placed within the heat exchange fins controlled condensation which allow water molecules to remain in the cooled air. This invention allowed for refrigeration without icing of the cooling mechanism.
Breakeryard are the Worlds Leading Car Breaker Suppliers of Heat Exchanger.
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