Oil in refrigerant — many chillers have too much, and it’s lowering system efficiency in a big way, coating evaporator coils and affecting heat transfer surfaces. A new product is said to address the problem of too much oil in the refrigerant, while keeping the oil at a level that actually helps system efficiency, according to Mark Key, vice president of component manufacturer Redi Controls.
The Sheet Metal Workers’ International Association (SMWIA) has formally announced its support for the “United States Toxic Mold Safety & Protection Act,” a bill scheduled to be introduced in the U.S. House of Representatives by Representative John Conyers, Jr. (D-MI).
A positive temperature coefficient resistor (PTCR) is a resistor that varies its resistance with its temperature. A resistor that changes its resistance characteristics as a function of its temperature is also called a thermistor. So the PTCR is technically a thermistor.
Sales Engineering, Contracting & Associates (SECA), a design-build mechanical contractor and purchasing agent, has worked with several Melia hotels over the years on various projects. Since the early 1990s, the firm has assisted 10 of the chain’s resorts, improving existing potable water systems and providing significant hot water cost reduction.
There is more to the blueberry business than pies, cobblers, and sticky fingers. There is berry picking and selection, packing, storing, and shipping. At Chambers Brothers Farms, a cooling system lends a huge helping hand. The technology is considered so innovative that blueberry farmers from throughout the U.S. travel to Homerville, GA, to see how it is done.
When a project consists of 430,000 square feet of refrigerated space, conventional wisdom would suggest a cooling system consisting of a large mechanical room with a refrigerant such as ammonia.
But the new International Produce Market in Chicago is going against convention. Instead of a mechanical room, there are more than 100 rooftop condensing units. Instead of ammonia, the refrigerant of choice is R-22.
Steve Easley, owner of S.C. Easley and Associates, a construction consulting firm, and a former professor of building construction and contracting at Purdue University, speaks and writes a lot about the subject of indoor air quality (IAQ). You want answers? Here are a few from Easley to some basic questions on this increasingly important subject.
This is the second installment of a three-part series on mold and its relationship to HVACR systems. In this installment, The News examines what some companies are recommending for the prevention and the remediation of mold.