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Benefits and Drawbacks Of Roof-Mounted HVAC Commercial Units

Would you want to stay in a sweltering-hot building?

Definitely, no one would want to be in that situation. Commercial and industrial building owners and managers often face complaints from tenants and workers when the air conditioning system does not work well and efficiently enough to provide indoor air that is comfortably cool.

Comfortable Indoor Air
Hence, keeping the climate indoors comfortable for the people inside the building is high on the facility manager’s lists. They need to ensure that their HVAC systems are delivering the indoor air quality demanded of the building.

What Is HVAC?
HVAC stands for heating, ventilation, and air conditioning. An HVAC system consists of the heating and cooling equipment including furnace, boiler, condenser, compressor unit and heat pump, and the appropriate ductwork that are necessary to provide “conditioned” air indoors from the fresh outdoor air.

The HVAC system delivers three functions that are often combined into one system in today’s homes, commercial and industrial buildings or facilities. The HVAC system could also be responsible for diluting interior airborne contaminants such as odors from industrial chemicals, volatile organic compounds, etc. A properly designed HVAC system will provide a comfortable indoor environment year in and out with proper maintenance and upkeep.

Roof-Mounted Or Ground-Mounted
Depending on where it will be used, HVAC equipment may be mounted on the roof, or on a slab base in the basement. Contractors typically estimate the capacity, engineer, and select the HVAC systems and equipment for smaller buildings.

On the other hand, the HVAC systems for larger buildings are estimated, analyzed, and designed by the building service managers and engineers, and mechanical engineers. Fabrication and commissioning are usually performed by specialty mechanical contractors.

Larger buildings are usually installed with roof-mounted HVAC systems.

For the HVAC systems in industrial facilities and commercial buildings, placement of the equipment plays an important role especially in terms of efficiency and cost savings. They can either be roof-mounted or ground-mounted.

Benefits Of Roof-Mounted HVAC System
For industrial facilities, the typical HVAC system design requires a packaged rooftop HVAC unit due to a number of reasons including:

  • Space Saving
  • Cooling and heating in one
  • Pre-assembled and easy to install
The roof is complete and the heatingair con units installed

Roof-mounted HVAC units free up floor space in manufacturing facilities and commercial buildings.

Space Saving
The roof is usually the ideal and best place for the HVAC systems to be installed.  Obviously, every space in a manufacturing facility or commercial building is accounted for various important functions relevant to the operations. And since all the components in larger HVAC units are put into self-contained cabinets, and the roof space is the unused space, a roof-mounted HVAC system frees up floor space in the building which could be used for other manufacturing functions.

One System For Cooling And Heating
Roof-mounted HVAC systems are often configured to contain all the cooling and heating needs for an industrial facility or building, eliminating the need for separate systems. Aside from being convenient, this also allows for easier maintenance and repair of the units without disrupting other functions and activities in the building or facility.

Easy Installation
Installation of roof-mounted HVAC units is easier and much simpler as it only requires the installation of appropriate vibration isolation rails for the HVAC in self-contained cabinets to eliminate vibration, lower the sound level in the occupied space and mask off the sound from the equipment. Adding and installing new systems will pose no major disruption in the building’s operational activities.

Drawback: Regular Maintenance Required
Because of the exposure, roof-mounted HVAC units receive from natural elements such as rain, dust, sun, snow, and hail, it’s important and critical for the HVAC units to receive regular maintenance in order to keep the system working efficiently.  In many cases, ground-mounted HVAC systems don’t require as much maintenance as the roof-mounted counterparts.

In your manufacturing facility or commercial building, are the HVAC units roof-mounted or are they on the ground?

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Geothermal Inspires The World To Dig Deep For Clean Energy

Geothermal energy systems can quietly make power or heat while other renewable energy sources struggle. The wind does not need to blow, nor the sun shine. Geothermal power plants and residential geothermal heat pumps harvest heat generated by the Earth’s core. With so many advantages, nations around the world are breaking ground on new plants, and as a result, geothermal has captured the attention of the oil and gas industry.

Endless Energy Underground

The planet contains decaying radioactive particles that produce heat deep underground. The Earth’s core maintains a temperature of 10,000 degrees Fahrenheit. Theoretically, if humanity could collect even 0.1% of that energy, civilization could have endless power for 2 million years.

Global Interest In Geothermal On The Rise

Geothermal power plants can operate 24/7 and cause very few harmful effects on the environment. Compared to fossil fuel power plants, geothermal plants can boast 99% less CO2 emissions and 97% less sulfur compound emissions.

Sasso 2 geothermal plant by Enel Green Power, Tuscany, Italy. Credit: T. AGEMAR

Geothermal’s positive features have presented nations around the world with a reliable clean energy option. India has launched its first major geothermal project in Ladakh to take advantage of an area of naturally occurring geysers. The third stage of the project will result in a 250 MW plant that will support the region’s goal of carbon-neutral energy generation. Similarly, workers in New Zealand will soon break ground on a 150 MW plant.

New Work For Oil And Gas Drillers

Drilling the wells required for geothermal plants is a perfect job for oil and gas companies that have mastered drilling technology. Instead of drilling for fossil fuels, their resources could drill for the Earth’s heat. Diminishing returns on oil and gas investments have made geothermal increasingly attractive to energy executives looking for new opportunities. For this reason, geothermal plant building could offset concerns about lost jobs in legacy energy sectors.

Krafla geothermal power plant in Iceland. Credit: Ásgeir Eggertsson

With geothermal primed to expand globally, what other industries do you expect to participate in plant construction and operation?

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Is Sugarcane A Biofuel Solution For Greener Jet Fuel?

For as much as people complain about air travel, demand for this mode of transportation is on a rapid rise, and with the increased reliance on aviation comes a boost in greenhouse gas emissions and tougher challenges to respond to global price fluctuations in oil. This is why some innovators are looking for alternative, plant-based sources to create jet fuel. Sugarcane may be one of the more viable options according to researchers from the University of Illinois.


Image Source: Wikimedia

A Better Source Of Biodiesel And Ethanol

In their recently published study, Deepak Kumar, Stephen P. Long, and Vijay Singh of the University of Illinois at Urbana-Champaign state that sugarcane could be engineered to yield significant quantities of biofuel that could then be used to power aircraft. While other biofuels, including camelina and algae, have successfully gotten test flights off the ground, Kumar, Long, and Singah see sugarcane as a better source of biodiesel and ethanol, provided the cane’s natural oil production could be increased through engineering.

Aircraft being fueledjpg

Image Source: Wikimedia

Engineering Crops For Reduced Emissions

Currently the researchers are working to develop a sugarcane crop that’s capable of producing 20 percent oil—which is a major jump from the 0.05 percent the plant produces organically. The increase in natural oil production would be critical to its use as a reliable source for jet fuel. The engineered sugarcane, called lipidcane, would offer five times the profit per acre compared to soybeans, according to the researchers. They also state that 23 million acres devoted to the production of lipidcane could fulfill 65 percent of the U.S. jet fuel demand, which would contribute to the reduction of global carbon dioxide emissions by as much as 5.6 percent. This all depends on whether the research team can successfully engineer a variety of sugarcane that reliably produces the level of oil needed to make the plant a viable fuel source, though they have made progress with a lipidcane that produces 12 percent oil within its leaves.


Will the fuel that takes us to the skies be rooted sugarcane crops? What do you think of this type of biofuel development? Comment and share your thoughts.

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Racing With The Sun At The 30th Anniversary World Solar Challenge

Engineering teams from around the world recently gathered at Australia’s biannual World Solar Challenge to compete in a race from Darwin to Adelaide in cars powered by the sun. This year marks the 30th anniversary of the event and with it came some notable challenges and developments.

world solar challenge 2017 car

Image Source: Digital Trends

Tough Standards On Unique Designs

With 42 competing cars from 40 countries, this most recent World Solar Challenge featured an array of unique designs. This year also provided challengers with tougher standards for their racers by requiring a smaller solar collection area.

Speed From The Sun And Aerodynamics Alone

The cars themselves are unlike most vehicles you’d ever see on a race track. Most cars feature a tiny space for the driver and a large flat surface designed to collect the maximum amount of solar energy, while maintaining an aerodynamic form. As each entry must be powered by solar energy alone, design is key to speed—and racers are able to reach over 60 MPH along the 1,860 mile track running through the Australian outback.

A Test For Design And Technology

Being first to cross the finish line is not the only goal of the challengers; the race is as much about research and development in sustainable vehicle design and technology. The Challenger class puts speed to the test, while the Cruiser category is devoted to transportation practicality, and the Adventure class is all about exploring submissions that offer merit regardless of speed and design.

Solar cars from more than 20 countries are set to race from Darwin to Adelaide in the World Solar Challenge

Image Source: Hi Tech Beacon

A Focus On Reliability

The U.S.’s own submission from Stanford University has been designed with a focus on reliability and safe handling over speed. Many eyes are on the Dutch Nuon Solar Team’s Nuna9 car, which has been modified to a new level of aerodynamics. Currently, the time to beat belongs to the Tokai University team from Japan which made the more than 1,800 mile journey in 29 hours and 49 minutes.


What are your thoughts on this competition and the solar power developments that could come out of it? Comment and tell us what you think.

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