September 19, 2021

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The Significance of Heat Transfer and Purpose of Heat Exchangers

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That's why dolphin heat transfer group consists of different aspects such as thermal radiation, thermal conduction, and thermal convection. Check out Dolphin Coils now.
Dolphin Heat transfer

Dolphin Heat transfer

Heat transfer is one of the key aspects of thermal engineering and is important in the generation, conversion, and use of thermal energy. That’s why dolphin heat transfer consists of different aspects such as thermal radiation, thermal conduction, and thermal convection.

Heat transfer has wide applications in numerous systems and devices. The process may be necessary to store, increase, or decrease the temperature in a particular setting. Various segments that use heat transfer methods are climate control systems, automotive industry, climate control, power station, and materials processing. 

The thermal insulator plays a crucial role in reducing the heat and limiting conduction and convection. Engineers use thermal resistance to measure the ability of material or object to resist heat flow. Equipment such as heat engines is ideal for converting thermal energy into mechanical energy. 

What is Heat Exchanger?

One equipment that is widely used for efficient heat transfer is a ‘heat exchanger.’ The main purpose of a heat exchanger is to transfer heat between two liquids. There is usually a solid wall that prevents the two fluids from mixing. It is a common component in air conditioning, power generation, and petrochemical plants. 

One simple example of a heat transfer is a car’s radiator in which a hot coolant is cooled down by passing flow of air. 

There are various types of heat exchanger flows which may include 

  • In parallel flow, the two liquids flow in the same direction and also transfer heat
  • Counter flow, the two liquids flow in opposing direction
  • Crossflow, the two liquids flow at right angles to each other

The common type of heat exchangers includes double pipe, shell and tube, stacked plate, spiral fin tube, and fin pipe. Each of the types serves different purposes and has different advantages. 

There is an additional component of the heat sink in commercial use that can convert heat from air to liquid. These types of heat sinks are common in air conditioners and refrigeration. Another device is a heat pipe that combines phase transition and thermal conductivity to transfer heat within two solid objects. 

The Purpose and Use of Heat Exchangers

The heat exchangers serve wide commercial and industrial applications. Air conditioning, refrigeration, and heating systems are a few of the primary uses. Few industrial tasks require a particular type of heat transfer to function. But a considerable amount of care is necessary to prevent these processes and systems from overheating. 

The heat exchangers are an essential component in industrial plants and factories. The emphasis is on ensuring that the machines, chemicals, water, gases, and other substances work at safe operating temperatures. Heat exchangers are also vital in capturing and transferring heat or steam heat released by-products. The heat can then be used elsewhere and increase the productivity of the plant.

There are various types of heat exchangers, and all work differently. The equipment, parts, design features, and flow arrangement are different. However, one common element in all is the ability to expose warmer mediums to colder mediums. The process is made easy by the use of a special casing and tubing. Other important parts include coolants, belts, condensers, additional tubes, and lines. The factors that help to classify the heat exchangers are

  • The type and physical state of the liquids
  • Flow arrangement of the heat exchanger
  • The design features and process of a particular heat exchanger
  • The nature of the heat transfer process 

The Elements that makeup Heat Exchanger

The first factor that engineers consider when designing a heat exchanger is whether the substances for which heat will be exchanged come into direct contact or not. Mostly there is a wall or barrier that separates the two fluids. 

Direct heat exchangers allow two fluids to come into direct contact rather than convection or radiant heat. Experts suggest that direct contact is an efficient method of transferring heat as contact is direct. But the safety of the process is one factor to consider. The direct heat exchangers are effective if the two liquids have little temperature difference while heating. 

The indirect heat exchangers, by the name, suggest keeping the two liquids apart from each other. The hot and the cold liquids are put into separate pipes and rely on convection and radiant heat. The separation is necessary to prevent contamination of one fluid with the other. 

Another factor for the classification of a heat exchanger is the state of the physical liquids. The three types are

  1. Liquid-Solid
  2. Liquid – Gas
  3. Solid – Gas

The heating temperature and ability to mix is a factor to consider. For example, oil and water do not mix and are immiscible. 

The arrangement of the liquid flow is an important factor to consider while categorizing a heat exchanger. The three categories include

  • In parallel flow, the hot and cold liquid enters the heat exchanger from the same direction but flow parallel to one another 
  • Counter flow, the hot and cold liquid enters the heat exchanger from the opposite end but flow toward one another
  • Crossflow, the hot and cold liquid, enters the heat exchanger from a different direction and flow through and cross paths at a right angle

How Cooling and Heating in Heat Exchanger works

The equipment may be named a heat exchanger, but it is an essential component in air conditioning and refrigeration. It is a natural phenomenon that heat moves from an area of hot temperature to cold temperature. The role of the heat exchanger is to reverse the process and allow it to cool or heat a place. In commercial use, heat exchangers transfer thermal energy from one material to another. 

A typical HVAC (Heating, ventilation, and air conditioning) system uses conduction to transfer heat. The heat travels from one molecule to another, and contact comes from the heat source. The air conditioner works by removing heat from indoors and expelling it outdoors. On the contrary, the heating system works in reverse as that of an air conditioner. 

dolphin group Dubai have a crucial role to play in heat transfer in refrigerators, air conditioners, HVAC systems, and automotive plants. The vendors usually consider the design features and cost while considering heat exchangers. The temperature performance and thermal performance are a few of the factors while selecting a heat exchanger.

 

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