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4  FM quick reads on hvac

1. HVAC System for Good IAQ


Part of maintaining good indoor air quality in a facility means making sure the components of the HVAC system itself don''t become a problem. Filters and drain pans first leap to mind, but other components can play a negative role as well.

For example, there''s the HVAC piping. To protect indoor air quality make sure the piping - steam, condensate, or hot and chilled water - does not leak. The piping could have high concentrations of corrosion inhibitors to extend its useable life. These chemicals could become airborne if a leak is not addressed.

Another area to keep an eye on is the ceiling plenum. When the area above ceiling tiles is used as a return plenum, it''s important to keep that space free of contamination or contaminated materials, such as contaminated ceiling tiles or wet insulation. If these types of materials are allowed to remain in the plenum space, microbes can be aerosolized and eventually move into the air stream.

2.  Sub-Meters Monitor HVAC Components

This is Chris Matt, Managing Editor of Print & E-Media, with Maintenance Solutions magazine. Today's tip is sub-metering and energy efficiency.

One area in which sub-metering technology excels is measurement and verification. Since technicians can install a sub-meter almost anywhere in the electrical-distribution or branch-circuiting system, managers can specify meters for use in areas in which they are most effective in gathering useful energy information. For managers in a large facility who want to understand the building's overall energy profile, these meters can help by monitoring individual pieces of equipment, including chillers, pumps, air handlers, and other HVAC-system components.

By collecting this data, managers can identify operational inefficiencies. Often, this step can reveal interesting trends, such as two or more large motor loads starting at the same time, which causes system spikes. By alternating or staggering these loads, managers can eliminate spikes and improve efficiency.

Sub-meters also can alert front-line technicians to the potential failure of a piece of equipment before it fails. Monitoring the current draw on a piece of equipment generates a profile. Once that piece of equipment starts to draw more than the recorded profile current, technicians can program an alert to let them know a potential problem exists. The technology allows technicians to take preventive measures before a costly failure occurs, and the resulting savings in downtime and maintenance costs can more than pay for installation of the sub-meters.

3.  Benefits of Submetering Central Plant Can Justify Cost

Today's topic is the value of submetering the central plant.

The chiller plant is likely to be one of the facility's largest energy users, and often the largest. That makes it a good candidate for submetering.

The biggest obstacle to submetering is typically cost. But submetering the chiller plant offers a range of important benefits that can justify the cost. Perhaps most important is that it enables facility managers to analyze the energy consumption of the central plant. For example, if chiller plant energy use climbs from one spring to the next, it may be that outside air economizers aren't working properly. Or a change in operations or a problem with controls may have caused a spike in electricity use. Addressing problems like those can bring significant savings.

Data from submeters can be used to test the effectiveness of various operational measures designed to save energy and to verify whether upgrades have actually performed as expected.

What's more, submetered data may help to identify problems with equipment. Addressing those problems may not only save energy, but prolong the life of the equipment or identify a piece of equipment that is failing.

Finally, in a multitenant building, the use of submeters can be an element in an overall energy efficiency or green strategy used to attract and retain tenants.

4.  Portable Cooling Units One Option In Data Center HVAC Control

I'm Justin Smith, managing editor of web development for Building Operating Management magazine. Today's tip: portable cooling units in data centers. As technology advances and hardware becomes more powerful, the issue of cooling data centers continues to heat up. There's a simple logic to the situation: as facilities add more equipment, the greater the cooling needs will be. One solution is to add a portable cooling unit to your facility. These units can be permanent or temporary and generally are used where known hot spots exist in rooms where large, capital-intensive cooling solutions are not possible. Portable units can supplement existing HVAC systems and installations can be scheduled when maintenance tasks require the shutdown of the main system. In general, the units can be air- or water-cooled, capacities can range from 0.5 to 5 tons and they can be wheeled or ceiling-mounted. Costs can range from $600 to more than $12,000 per unit. So, whether for a temporary fix or a permanent addition, portable units in data centers are a cool idea.


hvac , plenum , piping

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