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Saturday, July 28, 2012
Thursday, July 26, 2012
Genaral Good Service Practies
NON CONDENSABLES
Gases,other than refrigrant ,are contaminants that frequently found in air conditining and refrigration system.These gases infiltrate sealed system in the following manner: (1) Non-condensable gases are present during manufacture and remain due to incomplete evacuation,(2) non-condenseble gases are desorbed from viarious system meterials of are formed by decomposition of gases at elevated temperatures during system operation,(3) non-condensable gases are enter throught low side (below atmospheric pressure) leak and (4) non-condenseble gases are formed from chemical reactions between refrigrants,lubricant and other components in the refrigerating system,in extreme cases,the refrigranting unit fails.
Chemically inert gases in thr system,Which do not liquefy in condenser, redue the cooling efficency. The quatity of inert noncondensable gas that is harmful depeds on the design and size of the refrigranting system and nature of the refrigrant Its presence conditributes to higher than normal head pressires and resultant higher discharge temperature. Higher temperatures speed up undersirable chemical reactions. Gases found in hermatic refrigration units includes nitrogen,oxygen,carbon dioxide,carbon monoxide,methen and hydrogen. The first three gases listed originate from incomplate air avacuation oe a low side leak in system. Carbon dioxide and carbon monoxide usually from when organic insulation materials are overheated. Hydrogen has been detected when a compressor is experiencing serious bearing were. Only trace amounts of these gases are present in well-designed,properly functioning eqipment.
Manual relese of non condensables. 1-compressor, 2-condenser, 3-receiver
Chemically inert gases in thr system,Which do not liquefy in condenser, redue the cooling efficency. The quatity of inert noncondensable gas that is harmful depeds on the design and size of the refrigranting system and nature of the refrigrant Its presence conditributes to higher than normal head pressires and resultant higher discharge temperature. Higher temperatures speed up undersirable chemical reactions. Gases found in hermatic refrigration units includes nitrogen,oxygen,carbon dioxide,carbon monoxide,methen and hydrogen. The first three gases listed originate from incomplate air avacuation oe a low side leak in system. Carbon dioxide and carbon monoxide usually from when organic insulation materials are overheated. Hydrogen has been detected when a compressor is experiencing serious bearing were. Only trace amounts of these gases are present in well-designed,properly functioning eqipment.
Manual relese of non condensables. 1-compressor, 2-condenser, 3-receiver
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