It also establishes a system for assigning a safety classification to refrigerants based on toxicity and flammability data, and provides a means of determining the refrigerant concentration limit. Unlike mechanical-compression refrigeration systems, which typically use R-22 and R-410A for refrigerants, absorption refrigeration systems use refrigerants that other substances are attracted to and absorb. Classification of Refrigerants. 6397. The refrigeration scheme is a circuit of interaction of cooling stations or plants with users of refrigeration. Meaning of Refrigerant: A refrigerant is a working substance which is used in refrigerating machine. ASHRAE Standard 34, Designation and Safety Classification of Refrigerants, establishes a simple means of referring to common refrigerants rather than by their chemical name, formula, or trade name. For example, if flammable refrigerants might leak from a system the room must meet special electrical and ventilation requirements. A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. DEFINITION AND CLASSIFICATION OF REFRIGERANTS. Read More : Introduction to Refrigerant and Classification Of Refrigerant refrigerant types Refrigerant types : Refrigerants can be broadly classified based on the following: 1. For pure compounds, the numbers are based on chemical formula. They are also given a flammability classification, indicated by a 1 (no flammability), 2 (low flammability), or 3 (high flammability). Puron is the exact same thing as R-410A. Locations of refrigerating systems are described by occupancy classifications that consider the ability of people to respond to potential exposure to refrigerants.Where equipment or appliances, other than piping, are located outside a building and within 20 feet (6096 mm) of any building opening, such equipment or appliances shall be governed by the occupancy classification of the building. Refrigerants are divided into groups according to their chemical composition. It was invented in 1991 but did not begin to see real popularity until the 2000’s. Classification of Refrigerants, establishes a simple means of referring to common refrigerants rather than by their chemical name, formula, or trade name. 4.3 CLASSIFICATION OF REFRIGERANTS Refrigerants can be broadly classified based on the following: Working Principle Under this heading, we have the primary or common refrigerants and the secondary refrigerants. It is a medium of heat transfer which absorbs heat by evaporation at low temperature and gives up heat by condensing at … Properties. Water and brine solutions are common examples of secondary refrigerants. For example, residential HVAC chillers often use ammonia as the refrigerant and water as the absorbent. Save. For flammability, there are three classifications and one sub-classification. The classification in part reflects the amount of refrigerant that is allowed in occupied space or the type of mechanical room equipment installed. This heat transfer generally takes place through a phase change of the refrigerant.

8.1 Introduction. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … ISO 817:2014 provides an unambiguous system for assigning designations to refrigerants. Classification of refrigeration systems. ASHRAE assigns numbers and safety classification to the refrigerants based on toxicity and flammability data submitted by the refrigerant’s producer. Share. Table 1: ASHRAE Safety Classifications of Common Refrigerants [1] Many working fluids have been used for such purposes. This refrigerant was designed to be a safe, non-toxic, non-flammable, and reliable alternative to the HCFC R-22. Through this lesson one can gain comprehension on the topics such as saturated hydrocarbon, unsaturated hydrocarbon, and inorganic refrigerants. SPS 345 refers to Group A1, B1, A2, B3, A3, and B3 refrigerant. 2. It is a working fluid through which heat is transferred from the cold body to the hot body. Refrigerants in this sub-classification have a burning velocities less than or equal to 10 cm/s (3.9 in./s) Now you may have noticed that at the beginning of this section that I said that there were three flammability classifications according to ASHRAE.

This lesson completely deals with the concepts related to Classification of Refrigerants. Restrictions on Refrigerant Use - Section 7 • Standard 15 Gives Rules based on Occupancy, System, & Refrigerant Classification • 3 kg or Less of Flammable Refrigerants may be used in Listed Equipment • A2L Refrigerant Application Requirements NOT Included – Presently Under Consideration ASHRAE Standard 15 4400 Lesson 7 of 7 • 80 upvotes • 9:29 mins.

Well, this was recently changed by adding this sub-classification. Classification of Refrigerants Refrigerant Standards/Regulations Safety Standards Building & Other Codes Local Codes ISO-817 Refrigerants — Designation and Safety Classification ASHRAE 15 Safety for Commercial Refrigeration Systems UL 621 Ice Cream Makers UL 471 Commercial Refrigerators & Freezers UL 60335-2-40 3rd Heating and Cooling Equipment ISO-5149 Safety & Environmental … ASHRAE assigns numbers and safety classification to the refrigerants based on toxicity and flammability data submitted by the refrigerant’s producer. Date: 29 June 2014.