Stagnating air can be dangerous to breathe, because of the accumulation of airborne contaminants, so ventilation was designed to supply the outdoor air into a building. Needless to say, ventilation to a building is vital. The common issue with ventilation systems though is the quality of airflow, as well as filtration. Some ventilation systems do not filter the particles, or, filter only certain types of particles, i.e. larger, less dangerous particles.
When electrical equipment must be maintained or repaired while energized, an arc flash hazard may be present. Affected workers need to know what steps should be taken to stay safe. Arc flash warning labels can provide this information, right where and when it’s needed. As a result, experts in electrical safety recommend using standardized and helpful arc flash labels
Dew point is one example of a very useful measurement to understand, design for and test for in an HVAC/R system. Take an evaporator coil, do you know how to calculate the exact temperature at which that evaporator coil will start to condense moisture? can you tell the exact temperature at which a surface inside of a space will start to condensate and possibly grow mold? These are both cases where a basic understanding of a psychrometric diagram can help a technician.
Typically when selecting heating solutions for a building, decisions are made based on its main function. It gets a bit more complicated, however, when the property is designed as a multi-purpose facility – possibly being used for retail, residential, and office space all at once. These buildings often present unique heating challenges that vary from room to room, calling for a diverse portfolio of solutions to ensure energy efficiency and occupant satisfaction.
Refrigerant circuit restrictions can be common things like a plugged filter drier or a restricted metering device. They can also be more difficult to diagnose and exotic issues like a kinked liquid line, blocked evaporator feeder tube, or a compressor connected improperly with a discharge line full of solder (I’ve seen it).
To start with, let’s talk about the symptoms.
When selecting inverter driven systems, the contracting community tends to ignore sizing issues because the popular belief is: The system will run only as necessary — you can’t oversize.
Nothing could be further from the truth. Proper sizing remains a fundamental in hot, humid climates. To be sure, inverter systems are here to stay and are valuable at shedding shoulder-month KWh. While the equipment may have ability to enhance humidity control during a normal run cycle with proper thermostat programming, a contractor will fight a losing battle when sizing is ignored.
If you are primarily a residential technician working on equipment under 5 tons, there is a lot of similarities between the systems you are used to and 5 – 20 ton rooftop units that
are common to the light commercial market.
Modern refrigerant systems are designed to be efficient and leak free. Refrigerant systems are pressurized and, in reality, it is widely accepted that no pressurized system is entirely leak free; it is simply a case of how much and where the system is leaking.
Service valves are so basic, and we see them with such regularity that we can miss them altogether. But, before I give the tips, I want to address the tech who tells the customer it was “probably the service valve” or “the caps were loose” as a plausible reason for a leak without actually doing a proper diagnosis. Don’t make excuses, find the leak.
Recent developments in factory-assembled cooling tower technology can increase cooling capacity per cell by up to 50 percent, expanding the applications for so called “package” towers supporting HVAC and industrial processes. Although field-erected towers have long been the preferred product for process cooling in power plants and heavy industry, new robust designs and materials coupled with cost-saving building techniques make the new generation of modular products logical alternatives for a broader range of applications.