Brian Dolin

Basic Thermodynamics For Refrigeration and Air Conditioning – Part 1 // W.9.1

Thermodynamics, White Paper /

Introduction Thermodynamics, as with most concepts in science and physics, is most accurately described using mathematical equations. However, simple explanations, although not perfectly accurate, are sufficient to convey the information needed to understand everyday experiences. This paper is an attempt to simplify these concepts. Thermodynamics simply describes the movement of heat. Thermodynamics is derived from thermo, meaning heat, and dynamics, (literally “power”), […]

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Frost and Defrost: How it happens and why it is needed // W.1.1

Frost and Defrost, White Paper /

Refrigeration is used to assure proper storage temperature of food products.  This is most often accomplished by using the vapor compression cycle.  In this technique, refrigerant vapor is compressed by a compressor, condensed into a liquid in a con-denser by the rejection of heat, expanded by a restrictive device, and fed into an evaporator where

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Electricity 101 // W.9.4

Electricity, White Paper /

Introduction Traditional forms of power include muscle (human and animal) wind, water and steam. However, our modern world is based on the availability of electricity to power our machines, heat and cool our homes, and preserve and cook our food. A basic knowledge of electricity is critical to understanding how heating, ventilating, air conditioning and refrigeration (HVACR) operates. Goals By

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Basic Thermodynamics For Refrigeration and Air Conditioning – Part 2 // W.9.2

Thermodynamics, White Paper /

This simple system shows the application of the Second Law. The compressor A adds energy to the refrigerant, and it becomes hot, just the way a hand operated tire pump does. Since the compressed refrigerant is hotter than the air blowing across the condenser B , the heat will flow to the cooler air. This is a transfer of heat

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Basic Superheat, Saturation and Subcooling // W.9.3

Basic Superheat, Saturation, Subcooling, White Paper /

An appreciation of the terms superheat and saturation is the key to understanding and troubleshooting air conditioning and refrigeration systems. Illustrations in this document show closed vessels for simplicity, but real systems consist of heat transfer surfaces (condenser and evaporator), a compressor and a restriction device. Goals By the end of this lesson you will understand superheat, saturation, subcooling, temperature glide

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