Basics of Refrigeration
Degree Days
Degree days is a term used to indicate the heating or cooling needed for any certain day. It is calculated fr…
Degree days is a term used to indicate the heating or cooling needed for any certain day. It is calculated fr…
The term "temperature humidity index" (THI) is a number which aims to establish the degree of disco…
Relative humidity is measured by a hygrometer. A hygrometer consists of two identical thermometers. The bulb …
The term "saturated vapor" identifies a condition of balance on an enclosed quantity of a vaporized…
As previously explained, relative humidity is the percentage of moisture contained in a sample of air compar…
The word humidity as used on connection with refrigeration, air conditioning, and weather information refers…
An isothermal condition is the expansion or contraction of a gas which occurs without a change in temperatur…
The term adiabatic refers to the process whereby a gas expands or contracts without any transfer of heat int…
Material Specific Heat CP CV R Air .............................…
Boyle’s Law and Charles' Law may be combined to solve true gas problems and the formula is as follows: Po…
The term cryogenics is used to describe the use of, or the creating of, temperatures in the range of -250 F.…
Entropy is the heat available measured in Btu per pound degree change for a substance. Entropy calculations a…
Enthalpy, for practical purposes, is the total amount of heat in one pound of a substance calculated from an…
The critical pressure of a substance is the pressure at or above which the substance will remain a liquid an…
The critical temperature of a substance is the maximum temperature at which the substance may be liquefied, r…
Solid carbon dioxide (CO2) is sometimes used for refrigeration. It is a white crystalline substance formed b…
Salt (NaCI) or calcium chloride (CaCI) added to water raises the temperature at which water will boil and low…
Refrigerating by ice will not provide refrigeration temperatures below 32 F. Therefore, to obtain lower tempe…
The flow of heat by each method can be controlled. That is, the transfer of heat by each of the methods can b…
Convection is the moving of heat from one place to another by heating a substance (fluid) such as air or wate…
Conduction is the flow of heat from one part of a substance to another part of the same substance, or from on…
The earth receives its heat from the sun by radiation. The heat rays from the sun are turned into heat as the…
There are three methods by which heat may be transferred from one body to another. These methods are radiatio…
In Fig. 1-19, refrigerant cylinder A is shown with the valve closed. The pressure, the temperature (inside an…
The basic purpose of a refrigeration System is to remove heat from one space and deposit it into another spac…
In refrigeration work, three common forms of energy must be considered: mechanical, electrical and heat. The…
As a gas is compressed its temperature is raised. The gaseous refrigerant returning to the compressor from t…
The term ambient temperature is used to denote the temperature of the air surrounding a motor, a control mec…
The common unit used to measure the refrigeration effect is the "ton." This is the amount of heat a…
Ice is still an important item in the refrigeration industry. As stated before, ice changes to water at 32 F.…
Fig. 1-18 . The temperature-pressure curve for water. At atmospheric pressure, water boils at 212 F. At poin…
In refrigeration work, the physics of latent heat is of special importance because it is this heat which pro…
A physical phenomenon of all pure substances is their ability to change their state, such as solid to liquid…
Our website uses cookies to improve your experience. Learn more
Ok