Redstone College

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What is HVAC?

Redstone College HVAC program

HVAC stands for Heating Ventilation and Air Conditioning. This technological procedure provides environmental comfort to both residential and commercial industries that require an efficient climate control. The main goal of HVAC is to provide the proper thermal comfort and desirable air quality for indoors. In addition, this technology system is designed based on a subfield of mechanical engineering. The system is rooted in the principles of fluid mechanics, heat transfer, and thermodynamics.

Essentials and Diverse HVAC System Applications

All kinds of industrial buildings including residential and commercial, highly depend on efficient and effective climate control and refrigeration that are meticulously maintained by certified professionals. With the depth and extent concerns of the environment drive to lessen energy consumption it also pushes to stimulate the advancement of new systems for heating and air-conditioning. This includes finding ways to innovate energy-saving features and installing optimized newer systems in existing home properties and buildings.

HVAC Programs and Trainings Important Role

Due to the diverse applications of the HVAC system and the vital role it portrays to industries and residential properties, acquiring and learning HVAC programs or training courses you can be a highly integral part of these leading industries.

Redstone College offers courses on HVAC. The training program embraces a rapid advancement in a career-focused course to aid progress in the world of working professional experts. The HVAC programs involve hands-on or practical training under the management of skillful working professional experts in this field.

Redstone prepares their graduates for entry-level positions in HVAC with a certified diploma within just ten months. You can also complete the associate degree within seventeen months which offers additional training in commercial and industrial systems. These entry-level positions vary. However, some of them include HVAC Installer, HVAC Service Technician and Refrigeration Service Technician.

High Demands for HVAC Related Employment

In the latest study, it was found that by 2024 there will be a 14% increase in the demand for HVAC mechanics and installers employment. This is quicker than the average for all occupations. The crucial factors that are driving this high demand could include a stable increase in HVAC technician retirements and an increasing focus on energy efficiency and pollution cutback that requires system optimizations or replacements.

In addition, following the recent recession, there has been a growth in both residential and commercial building construction. Lastly, this is also due to the high demand of highly sophisticated technical climate-control systems.

Therefore, all these factors add up to excellent jobs for well-trained HVAC professionals.


Refrigeration 101

Redstone College HVAC

To get ready to study for an HVAC associate’s degree, there are a few things you’ll need to be familiar with. The process of refrigeration is one of them. We’ll go through the basics of refrigeration here to get you started.

Heat Transfer

All refrigeration systems operate on one single principle: heat transfer. In any space, there’s heat. Naturally, the less heat there is in the air, the cooler it will feel. Refrigeration simply takes heat from the air in a space and transfers it somewhere outside.

Special refrigerant fluids are used to accomplish this. It’s run through a pipe system that allows it to absorb heat from inside an air conditioned space and carry it outside, where the heat is dispersed by a condenser. The way refrigerant is circulated through the system depends on how it’s designed. Two layouts for refrigeration systems are direct expansion and secondary loop.

Direct Expansion

The direct expansion system, or DX for short, operates solely on the pressure changes in the refrigerant fluid. In order for the system to function, the fluid changes state from a low-pressure liquid to a high-pressure gas. The whole system works something like this:

  • The refrigerant begins absorbing heat in the evaporator.
  • The refrigerant boils and becomes a gas, increasing pressure.
  • The pressure change causes the compressor to draw it down the line.
  • Once the refrigerant passes through the compressor, it is cooled by the condenser.
  • Being cooled to a lower-pressure state, the refrigerant moves on to an expansion valve.
  • The expansion valve relieves pressure and allows the cycle to begin again.

The reliance on state changes from liquid to gas means the system requires a great deal of refrigerant to function. It also means the piping needs to be made of very strong, resilient material.

Secondary Loop

A secondary loop system, or SN system, uses a pump to circulate fluid through a secondary loop (hence the name) that’s connected to a DX system. The refrigerant in the secondary loop absorbs heat from the refrigerated space through a heat exchanger. A pump circulates it to a chiller, which doubles as the evaporator in the DX side of the system. There, the heat is absorbed into the DX system where it follows its usual course.

A secondary loop system can function on half as much refrigerant as a strictly DX system, making it more environmentally friendly. Also, the secondary loop doesn’t have to change states, which puts less stress on the SN side of the system. As such, this method has become much more popular in recent years for HVAC systems.