Put the choice of water machine cold intermediary and foreground on the ice
Summary: The choice of cold intermediary is very simple - or it is relatively simple at least - till 1989 later period. Centrifugal in the past type (turbine) the cold intermediary choice of machine glacial water is R-11, R-12, R-22 and R-500. Below special need, be used to suit small size for example or be below state of high condensing temperature, criterion R-113 or R-114 can be used. Major engineer mostly not the cold intermediary that demonstrate asks or it is to plant via suggesting to amend when careful mark cold intermediary. They set norms of capacity, operation and necessary tubing, motivation and control characteristic only normally.
Keyword: Put water machine cold intermediary on the ice
The choice of cold intermediary is very simple - or it is relatively simple at least - till 1989 later period. Centrifugal in the past type (turbine) the cold intermediary choice of machine glacial water is R-11, R-12, R-22 and R-500. Below special need, be used to suit small size for example or be below state of high condensing temperature, criterion R-113 or R-114 can be used. Major engineer mostly not the cold intermediary that demonstrate asks or it is to plant via suggesting to amend when careful mark cold intermediary. They set norms of capacity, operation and necessary tubing, motivation and control characteristic only normally.
Former choice
R-11, compound of chloric carbon of a kind of fluorine (CFC) , it is a cold intermediary that often is used, basically be the efficiency that because of it negative pressure character brings and the cost advantage of machine glacial water. There are 2 to use this kind of cold intermediary in every 3 centrifugal about. The R-11 that uses at present puts water machine on the ice to still spend the sum total of all other centrifugal more, although they already already were developing national stop production 1994. This contradiction is as a result of R-11 aircrew many already installation is used and of unit equipment change newlier with aircrew cold intermediary (CFC CONVER- SION) is slow be caused by.
Another the most commonly used choice is R-12, it can enlarge the limits of centrifugal to small size, there can be very good cost advantage when increasing efficiency not by force. R-500 is regarded as because its can be when 50Hz motor rotate speed,centrifugal type puts the cold intermediary of water machine on the ice to use is achieve with R-12 same size gets in the similar design at 60Hz electric power. Be used continuously after that the equipment at 60Hz, because its can enlarge capacity limits. The power level of the one part that is in Europe, Japan and Asian other area is 50Hz; The power level that is in major North America and Japanese other area is 60Hz.
Major opportunity glacial water uses turbination type, piston or screw type (all be cubage type) compressor, use R-22 is cold intermediary, the compound of hydrogenous fluorine chloric carbon that it is a kind of high pressure (HCFC) . This kind muti_function cold intermediary molopolizes at the same time use at the greatest opportunity glacial water - exceed 5MWt(1400 Ton)- to use centrifugal compressor. The system that has a few - gross is little use R-717(ammonia at 10%- ) or draw type (machine of water of Absorption- Cycle) ice. Absorb type to put water machine majority on the ice to use water and bromine to change lithium to act as respectively cold intermediary and absorbefacient.
Previous12 Next