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HVAC Triple Evacuation | Heating & Cooling Refrigeration


HVAC Triple Evacuation

There is definitely some confusion among HVAC/R technicians about the proper methods of evacuation before introducing the refrigerant to the refrigeration circuit.HVAC Triple Evacuation Let me be clear from the start that my methods of evacuating a refrigeration circuit are based on experience, education and an official guide produced by the US Military and their specifications and proper procedures for evacuating a refrigeration system. It is the proper procedure on any US Navy ship or support ship that a refrigeration system that has been open to the environment be triple evacuated before the refrigerant is reintroduced to the refrigeration circuit.  The purpose is to prevent future problems because of contaminants including moisture in the system. 


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Top 5 Most Frequently asked HVAC Questions for HVAC Consumers


Old Condenser Top 5 Most Frequently asked HVAC Questions

Old Condenser

Top 5 Most Frequently asked HVAC Questions – Deciding to replace your HVAC system may seem simple, but when you get down to it it’s actually an expensive and tricky decision. To help you along in making an informed decision on your HVAC needs here are answers to  the top 5 most frequently asked questions. These five questions should get you on the right to finding the right heating or cooling system for your home.

Why should I replace my existing HVAC system?


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What is a Metering Device – Refrigeration Components


What is a Metering Device – Refrigeration Components

What you will learn from this article:
1) We will answer the question, “What is a metering device” by defining the various types of HVAC equipment that use different types of metering devices and why.
2) How the metering device is involved in the refrigeration cycle
3) A comprehensive list of metering devices defining the metering devices commonly used in HVAC
4) Lots of resource and related links to help you learn more about metering devices.

What is a Metering Device - TXV- Thermostatic Expansion Valve

TXV Metering Device for a Heat Pump

Depending on the type of HVAC air conditioning or heat pump system it is and the efficiency range of the system will depend on the type of metering device the system has installed by the HVAC manufacturer of the air conditioner or heat pump system. Lower efficiency HVAC air conditioner and heat pump models have fixed orifice types while higher efficiency systems have thermostatic expansion valves installed in the HVAC air conditioner or heat pump system. The thermostatic expansion valve is far more complex than the fixed orifice metering device as the thermostatic expansion valve metering device modulates the refrigerant flow based on the temperature of the refrigerant temperature in the evaporator coil. This allows a specific amount of refrigerant, based on demand, to be metered into the evaporator coil while the fixed orifice metering device allows the same amount of refrigerant to enter the enter the coil no matter the conditions or the demand. As the liquid refrigerant enters the metering device it changes temperature and pressure. A partial amount of the liquid refrigerant flashes into a refrigerant gas or vapor as it leaves the metering device and enters the evaporator coil.


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The Condenser for Air Conditioners and Heat Pumps| HVAC Refrigeration


The Condenser for Air Conditioners and Heat Pumps - Trane Heat Pump Condenser

Trane Heat Pump Condenser

The Condenser for Air Conditioners and Heat Pumps

The condenser coil receives the high pressure high temperature refrigerant vapor from the compressor and immediately begins to remove heat from the refrigerant vapor. As the refrigerant vapor makes its way through the condenser coil more and more heat is removed and the refrigerant vapor changes state from a refrigerant vapor to a refrigerant liquid. While the liquid refrigerant changes temperatures from a higher temperature to a slightly lower temperature the pressure remains constant. As the refrigerant vapor leaves the condenser coil it makes it way to the metering device.


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The Compressor | HVAC Refrigeration


The Compressor | HVAC Refrigeration

The Compressor in an HVAC refrigeration system

Compressor in an HVAC refrigeration system

In a typical HVAC air conditioner or heat pump there are four major components that make the process of refrigeration work. Basically, this is how air conditioners work. And how heat pumps work. The first component in the process is a compressor or the heart of any air conditioner or heat pump system.

The Compressor | HVAC Refrigeration – How it Works

HVAC Refrigeration Compressor – A compressor receives the refrigerant vapor from the evaporator coil and compresses the refrigerant vapor. The vapor enters the refrigeration compressor at a low pressure and a low temperature and leaves the refrigeration compressor at a higher temperature and a higher pressure. The lower temperature refrigerant vapor is responsible for providing cooling for the refrigeration compressor and it also carries with it a small amount of oil which migrates from the compressor throughout the system. After the refrigerant vapor is compressed it is discharged to the condenser coil. A compressor is an essential component in the vapor compression process of refrigeration.


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SUNDAY, July 05, 2015

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HVAC Tips: Helping You Learn

Air Conditioner & Heat Pump Tips: Additional Helpful Hints:
  • Always change your air filter on a monthly basis
  • Make sure all your supply vents are open and unobstructed
  • Keep area clean around indoor unit especially the return grills
  • Keep outdoor units free of leaves, grass, and debris including trash cans and/or children's toys or playthings like small plastic pools or playhouses.
  • Additionally your service technician will appreciate you not planting holly bushes near the outside unit
  • Lastly have system serviced every six months - once for heating and once for cooling before the season starts

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