Some HVAC Terms and Their Definitions

The HVAC industry has its own terminologies and for you to understand them, here are some of the frequently used technical terms and their meanings.

Air Handling Unit (AHU): this is a large metallic box with a cooling coil and/or heating element and some other components. It is used to control and move air as part of an HVAC system.

Air Cleaning: this is a part of an indoor unit. It controls air quality by filtering off harmful contaminants such as debris and dirt.

ACCA: this acronym stands for Air Conditioning Contractors of America, an association saddled with the responsibility of representing HVAC contractors.

AFUE Rating: AFUE means Annualised Fuel Utilisation Efficiency. It is unitless and expressed in percentage. It is the measure of the efficiency of heating units especially furnaces. The higher the AFUE rating, the higher the equipment’s efficiency.

Ambient Temperature: this is the temperature of air surrounding the cooling or heating system.

Air Balancing: this is the process of tuning an AC unit until the desired cooling or heating effect is efficiently achieved.

Blower: this is contained in the AHU. It is used to induce the flow of air.

BTU: the acronyms means British Thermal Unit. It is used to relate the cooling and/or heating capacity of a device.

Capacity: this is often displayed in units of BTU/h on nameplates of equipment. It refers to the capability of an HVAC system to cool or raise the temperature of a given space. A high capacity value denotes that a unit will supply more cooling or heating power.

Compressor: this is often described as the heart of a heat pump or AC. It is responsible for the pressurisation and movement of refrigerant through an HVAC system. it prepares the refrigerant for heat exchange in the condensing coil.

Coil: A cooling or heating element produced from tubing, fins or pipes.

Condensing Coil: contained in the outdoor unit of a central cooling system (CCS). It facilitates heat transfer from the refrigerant.

Condenser: this device removes heat from a refrigeration system and moves it to a unit that transfers it to a sink.

CFM: this is a measure of the amount of airflow in an HVAC system

Damper: this is a moveable plate or valve utilised in ductwork to regulate airflow.

Dehumidifier: this device strips air of excess moisture

Ducts: ducts are conduits that serve as medium for air movement and distribution in HVAC systems.

EER: Energy Efficiency Ratio – it is a measure of cooling efficiency

ERV: ERV means Energy Recovery Ventilator. This equipment moves fresh air into a given space and draws out stale air.

Filter: used to remove contaminants from air to ensure that quality air is distributed and the HVAC equipment is protected.

R-22: used as refrigerants in heat pumps and ACs but has been discontinued because of its ozone layer depleting ability.

R-410A: this refrigerant has replaced R-22. It does not contain hazardous substances

Refrigerant: A fluids that facilitates heat transfer into or out of the air distributed in a given space.

Thermostat: monitors and regulates the temperature in a given space.

 

For more HVAC related terms, lookup HVAC Glossary.

 

 

 

HVAC system Basics for Beginners

Are you a property owner, property manager, aspiring engineer or Tech enthusiast and you do not have the basic knowledge of HVAC systems? If yes, then you are reading the right introductory piece. All you need do is sit back, and pay raft attention.
HVAC refers to Heating, Ventilation and Air Conditioning systems. These systems are an essential part of residential, commercial and industrial buildings. The objective of HVAC systems is to control the circulation of air and moisture within living spaces while maintaining thermal comfort. HVAC system can also be regarded as climate controllers.
In more technical terms, the functions of an effective HVAC system include control of air movement, temperature and moisture control inside an air-conditioned confinement, air filtration and supply of fresh air for the control of carbon dioxide and oxygen levels in a conditioned space. A typical example of HVAC systems is the big air conditional blocks you might on rooftops of offices or apartment blocks.
Over the years, air conditioning has moved from the mere supply of cool air to the effective control of critical parameters such as air movement, temperature, humidity etc.
HVAC systems are of various types with one having its own advantage over the other. These types are:
• Packaged Systems
• Split Systems
• Ductless Split System
• Hybrid Heat Split
The technicalities of these types of HVAC systems will be elaborately discussed in subsequent articles.
Components of a Heating, Ventilation and Air Conditioning System (HVAC)
As a beginner, it is important to be familiar with the various parts of a HVAC system so that in the event of a slight technical complication, you will be able to identify the affected part. The effective functionality of each of the components of a HVAC system relies solely on one another (one must function effectively for the other to work properly). Here is a list of the key components of a HVAC system you must know:
1. Evaporator: this component is saddled with the responsibility of absorbing condenser heat load and ensuring that the HVAC cools properly.
2. Compressor: this component is widely referred to as the soul of HVAC systems; it provides the thrust and energy required to transport refrigerant around the system.
3. Condenser: this component forces out heat build-up inside the refrigerant to the outside air.
4. Thermostatic Expansion Valve (TEV): this device regulates the quantity of liquid refrigerant passing through the evaporator thereby maximising evaporator efficiency.
5. Boiler: this component of HVAC systems is responsible for the heating of water.
6. Duct Systems: A duct system serves as cool or warm air distribution point. It can either be flanged, rectangular or spiral.
7. Evaporator Blower Motor (EBM): this component forces air through the ducts.
8. Condenser Fan Motor (CFM): fan motor rejects heat load and maintains maximum head pressure required for operation of the compressor.
9. Furnace: this component is responsible for the transportation of air into the duct systems from the heat exchanger.
Other components include Chillers, Cooling Towers, pumps, Building Automation Systems (BAS) also referred to as Energy Management Monitoring Systems (EMMS)

Five Tips for hiring an HVAC technician

Your heating, ventilation and air conditioning unit is an essential component for the comfort of your home. When your HVAC system needs repair or replacement, it is crucial to hire the right technician for the job. Having trouble finding a reliable HVAC technician? You don’t have to worry anymore because we here to make sure you make an informed decision. If you hire the right contractor, you can get your unit replaced or fixed within a short period without any trouble. HVAC technicians have proper training in the repair, installation, and maintenance of the systems. If you need HVAC services but have difficulty finding a reliable heating and cooling company, here are five tips to consider for hiring the right technician for the job.

Experience within the industry

Experience is one of the critical things a good technician should have. It may not be necessarily a senior technician but the one with more years of experience in the industry is the best option. An experienced HVAC technician will be able to diagnose the problem with your unit and efficiently make the required adjustments or repairs. Ensure the technicians you hire to work on your HVAC unit have several years of experience.

Proper Credentials

There are companies which claim to offer HVAC services, but this does not guarantee that they have credentials for the job. When looking for a reliable HVAC company, always confirm that they have the credentials necessary for the job. If a license is a requirement in your state, make sure the technicians are licensed. A license is an indication that the technicians are well trained and has proper skills to handle air conditioning systems. The technician should also be properly insured to avoid liability in case of injuries or damages.

References

The best way to find a reliable HVAC technician is by word of mouth. Ask for a list of references from the technician before you consider hiring the technician. A reputable technician will have no problem giving you a list of strong references. Additionally, you ask for a referral from family members, friends, and neighbors. If you get it from someone that the technician does quality work, you will have confidence in them. Hire a technician with a good work history.  

Check online reviews

You can search the internet for the company and look into the reviews. By visiting popular websites that deal with home improvement, you can ascertain the reputation of your HVAC technician before you hire them. No wants to risk their home by hiring a technician that is not reputable. Go through the reviews to ensure you make an informed decision about choosing the contractor in question.

Pricing

One of the critical consideration for homeowners when planning for maintenance of their home appliances is the price. You should consider the price after you get someone with the above qualities first. After considering experience and proper credentials, you may have more than one technician. Get a detailed estimate from each of the remaining technicians before choosing on one. The lowest bid may not be the best option, and still, you need to be cautious to avoid paying more than you should.   http://www.springhillairconditioner.com/