If You Can’t Repair Leaks, Seal Them A leaking chiller forced an automotive manufacturing plant’s HVACR engineer to decide between a costly production shutdown or using a can of refrigeration system sealant to eliminate the leak. Deciding on the sealant quickly put a lid on the engine factory’s repair fees.
Aluminum Evaporators for Ammonia Air-cooling evaporators used in ammonia systems have traditionally been made using galvanized (zinc-coated) carbon steel. There are other metals that are compatible with ammonia, including stainless steel and aluminum. Aluminum, in fact, can provide several benefits.
Seven Tips for a Healthy Computer Fixing “issues” and “conflicts” on computers can add up to tens of thousands of dollars lost to decreased productivity or service/repairs. Here are seven simple tips everyone could adhere to — businesses and individual computer users alike — that will keep your computers (and wallets) in tip-top shape.
Residential Cooling, Heating Equipment Shipments Down in February United States factory shipments of residential cooling and heating equipment declined in February, compared with the same month a year ago, according to the Air-Conditioning, Heating, and Refrigeration Institute (AHRI).
Construction Faces Tumultuous Year For Projects, Prices, Labor Nonresidential construction will experience wide variance in demand, materials cost, and labor availability, according to a Construction Inflation Alert released by the Associated General Contractors of America (AGC).
Group Marches on the Power of People In
the spring of 1994, two men witnessed their shared vision take root in the
inaugural assembly of many of the most dedicated commercial HVAC service
companies. The occasion was the first of 28 consecutive semi-annual meetings of
the Chiller Systems Group (CSG).
by MikeMurphy
Chillers Install Goes Modular The ability to meet a fast-track, multi-phased construction schedule and energy-efficiency goals were critical factors in the selection of a modular central plant to air condition Chaparral High School in Scottsdale, Ariz. Beating the desert heat and quiet operation were also considerations.
Refrigerant Deadline Pushes the HVACR Industry to Prepare As 13 SEER came down the pike in 2006, contractors and distributors, operating on scattered timetables, took multiple approaches to preparing for the new industry requirements. Faced with yet another transitional challenge, the industry is making new efforts to prepare for 2010, the next step in R-22 phaseout.
The first Copeland Scroll® rolled off the production line in 1987, and the cooling industry was changed in a way that would benefit contractors and their customers in many, many ways. The prime benefits have been efficiency and product reliability.
Many features of the Scroll focus on preventing compressor failures, but the Scroll’s primary design also improves efficiency and reliability thanks to its classic, concentric compression scroll, in which one spiral-shaped part fits into another; the space between the two parts contains crescent-shaped gas pockets.
CLASSIC SCROLL OPERATION
In operation, one Scroll is fixed in place while the other orbits within the first. The refrigerant gas is drawn in by the movement and forced toward the center of the scroll through successively smaller pockets, thereby increasing the gas pressure until it reaches its maximum pressure. Then it’s released through a discharge port in the fixed scroll.
Copeland Scroll compressors are unique in the industry because they feature both axial and radial compliance in their design, whereas other scroll models utilize a mechanically fixed design and scroll tip seals.
Axial compliance refers to the ability of the scrolls to separate in the axial — or vertical — direction remaining in continuous contact around an axis, in all normal operating conditions, ensuring minimal leakage without the use of tip seals. Radial compliance refers to the ability of the scroll flanks to separate. These features of the Scroll design allow the compressor to be more tolerant of liquid refrigerant or debris than other technologies, making for a compressor that is extremely durable and reliable.
The combination of axial and radial compliance means that Scroll compressors actually “wear in” rather than wearing out. Continuous flank contact, maintained by centrifugal force, also minimizes gas leakage and maximizes efficiency of the compressor.
Next month: Tech Tips will begin examining the Scroll’s improved reliability through its oil control system.
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