*This article was originally published as an advertorial in ASHRAE Journal, July 2022

More and more, leaders want to provide comfortable workspaces for their employees with HVAC that’s both reliable and sustainable. Persistent challenges such as uneven temperatures and inadequate ventilation can be addressed head on with the right equipment and technology. These systems also play a vital role in the reduction of natural gas consumption resulting in lower carbon emissions. 

While electrified systems that produce zero carbon are a long-term goal for some, the reality is that leaders will need to make decisions for their facilities long before that goal will be achievable. Finding partners and technology that require less carbon, especially for large, high-bay facilities is instrumental to helping these leaders along that path.

Cambridge Air Solutions’ proprietary HTHV technology in our S-Series heaters enables industrial space heaters to be more energy efficient than all other types of indirect and direct gas-fired systems. Since they only require a very low energy use per square foot, facilities can realize a 20-70% reduction in energy usage, according to a DOE study.

This energy efficiency directly translates into reduced natural gas usage compared to other technologies resulting in less carbon emissions from the facility.

What is HTHV?
High Temperature Heating & Ventilation (HTHV) Space Heating Systems are designed to meet a building’s ventilation and space heating requirements while maximizing energy efficiency. The blow-thru design, with 160°F maximum temperature rise and discharge temperature, delivers more usable heat and thermal comfort with minimal temperature variation throughout the heated space. 

Meeting ASHRAE compliance with 100% outside air.

ASHRAE 62.1 requires outside air for human occupancy through mechanical ventilation or natural infiltration. The air load is a significant portion of a building’s heat load, but in a direct-fire ventilation system (as in the S-Series), there are no flue losses and units have a 92%-100% AFUE rating as compared to 60% - 83% AFUE ratings of indirect-fired systems. Moreover, every degree above space temperature is usable for conduction losses.

Run an energy use analysis to see how HTHV will save on energy in your specifications.
Conducted by our applications engineering team and your local Cambridge rep, this analysis directly compares natural gas usage and corresponding costs of existing systems and proposed Cambridge Air Solutions’ systems. 

Find your local rep to get this analysis started by clicking here.

When deciding on a system to heat your facility, cost plays an important role. While some project bids might gravitate to the cheapest available option to meet the specs, it is pertinent to consider the other cost factors involved (energy savings and maintenance costs) as they will play a major role in the overall unit life cycle cost.

On our S-Series HTHV heating unit, the unique blow-thru design, with 160-degree maximum temperature rise and discharge temperature, delivers more usable heat and thermal comfort with minimal temperature variation throughout the heated space. In addition, this commercial/industrial space heater is 20-70% more energy-efficient than all other types of indirect and direct gas-fired systems used to heat large commercial and industrial buildings. 

 

We all know that heating and indoor air quality play a significant factor in providing a happy and healthy work environment, and that yearly maintenance is necessary to keep those systems running efficiently.  

Jeff Hodge, a member of the Cambridge service team, has provided some simple tips for mid-year maintenance to your commercial or industrial HVAC unit.

End-of-Year Maintenance Tips

1. Filters - Service the filters as needed based on the “loading” experienced. Turn off the heater before servicing filters. Remove the filters from the filter section by opening the filter access door. Handle the filters carefully to prevent debris from being dislodged from the filter into the heater.

2. Check the belt - periodic belt adjustments help ensure the sustainability of the belt. If a belt is too tight, it can prematurely wear out the bearings and the belt. If the belt is too loose, it can slip or squeal. 

3. Check the discharge temperature - Use a wired thermistor at the mixing box to calibrate the system if necessary. 

4. Inspect the control panels - Look for loose or frayed wire connections and make sure all connections are tight. 

5. Perform a gas valve leak test - This will ensure the integrity of the valves. 

6. Grease the bearings – Dependent upon usage, your bearings may need to be regreased. The grease should be evenly distributed around the race. However, do not use the standard bearing grease in the Baldor motor. Instead, this motor takes special grease that can be referred to in the technical manual. 

7. Check and clean the evaporator and condenser coils - Dirty coils will drastically reduce cooling equipment efficiency and strain the compressor. 

8. Perform a gas valve leak test - This verifies the integrity of the valves.

9. Verify that the manifold differential gas pressure matches the nameplate.  It is extremely important that this is set up properly.  If the manifold pressure is incorrect, the heater temp rises and its efficiency will be affected.   

10. Inspect the direct evaporative media (CELdek) - Ensure that there is proper water flow across the media. 

11. Check the calibration of digital thermostats - Press the up arrow and hold it; the display should show 0F.  If not, the calibration may have been adjusted to show a warmer or cooler temperature than desired.

Additional Resources

It is important to achieve maximum efficiency from your commercial or industrial HVAC system. For more tips and instructions see our “How-To” videos, and with any further questions, please reach out to the Cambridge service team.

Cambridge had the pleasure of hosting a virtual tour for the MAM's "Gearing Up" 2021 virtual conference. This video, led by Becca Jenkins, shows the improvements that we have made to one of our workstations and provides some insight into how a lean culture of continuous improvement looks.

This blog is guest written by Matt Lanham, Regional Sales Manager at Cambridge Air Solutions.

The horsepower paradigm

Watching from the pits of a National Hot Rod Association (NHRA) event, while a team of mechanics ushered a top fuel dragster into their tent, broke the engine down, retooled and quickly rebuilt 6000 horsepower in front of me. These guys know how to harness an extreme amount of power necessary to propel a driver ¼ mile in less than 4 seconds. While I observed the bevy of activity taking place like a well-choreographed production, a team of technicians huddled around a computer display, making minute adjustments to the engine; trying to tweak out every last drop of power necessary to win the next race.

What are these technicians most concerned about? Atmospheric conditions and its direct effect on the generation of the most power they can achieve – all for one 3.6 second race.

A basis of design
I am often asked to substantiate our talking points regarding the true power of our S-Series space heater. Utilized in warehouse and manufacturing environments, these units pack a ton of horsepower to offset heat losses caused by infiltration, open dock doors and skin losses inside buildings. Small in stature, we offer units ranging from 250,000 BTU all the way up to 3,200,000 BTU. Being the only unit available that can achieve 160F discharge and temperature rise does raise some eyebrows. Other manufacturers have claimed to be “like Cambridge”, but the simple fact of the design of the unit offering a blow-thru arrangement, it has inherent advantages over every other heating unit in the market.

More efficient design due to atmospheric gains
Bringing in 100% outside air and introducing it to our blower FIRST before raising the temperature is the basis of the S-series unit. Due to this, we often show our engineering community the effect of our fans processing an air mass that is higher in density – thus containing more oxygen; a vital component in clean combustion.  Without diving into the laws of thermodynamics, fans that process cooler, denser air help produce higher BTU outputs than units that pull air thru a burner – where they are processing warmer, less dense air. Cambridge is the only manufacturer to build its own burner - a fully stainless steel unit - while keeping the mechanical components out of the hot air stream leading to a longer life-cycle of the components.

Healthier buildings using 100% outside air
Indoor air quality is a hot topic lately, largely due to end-users wanting healthier working environments for their most precious asset - their people. Business continuation is dependent on having a consistent and healthy work force and recirculated air inside of spaces isn’t healthy. To offset unhealthy indoor contaminants that build up in spaces that use recirculated air, proper use of HVAC units bringing in 100% outside air is paramount. Recirculation units also offer a lower temperature rise, and need to run for much longer periods of time to offset heat and pressure losses inside of spaces. This is wasted energy.

High performance support
There’s no questioning the 400+ building and case studies we’ve performed in a variety of markets with solid data to support worker comfort, more even temperatures and gas and electrical savings over other technologies out there.  Our contractors have come to love the fact that we make our S-series units the most complete heating and ventilation package there is in the market – taking a lot of the guesswork out of their day searching for missing pieces or parts they thought they were getting. Our support team of engineers, technical trainers and technical advisers are there to help our contractor and engineer community with on-site or virtual training, developing the next solution or running a heat load with layout; giving our customers the confidence they need, knowing the factory is backing them up.

Come visit and ask us anything.
Come witness for yourself what a high performance team of individuals do every day at Cambridge Air Solutions. Come see us virtually for exposure to our Lean journey or a product tour. Come feel that same heart-pumping charge we get seeing our folks improve everything they do – every day.

Cambridge High Temperature Heating & Ventilation (HTHV) Space Heating Systems are designed to meet a building's heat and air load requirements and be energy efficient. 

Discharge air from the S-Series HTHV Heater creates a large volume of fresh, warm air flowing throughout the building which eliminates higher ceiling temperatures and uncomfortable drafts. The S-Series Heater utilizes 100% fresh air to dilute contaminants generated within the building. This virtually eliminates air quality problems associated with infrared heaters or conventional air heating systems that recirculate indoor air.

The video below highlights the technology behind our S-Series heater or you can click here for more product information.