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What is the Difference Between Blow Through and Draw Through?

3 MIN READ

This blog was guest written by Chris Leach, Applications Engineer. There are two main non-recirculating direct gas-fired heater designs for commercial and industrial applications and those are blow-through and draw-through. The main difference in these two systems is the location of the blower relative to the burner. While a simple difference, blow-through units provide multiple benefits for large industrial space heating driven applications. Blow-through, as defined by the DOE (Department of Energy) as HTHV (High Temperature Heating & Ventilation) and employed in our S-Series heaters, places the blower before the burner and benefits from a higher LAT (Leaving Air Temperature) and temperature rise (∆T). HTHV units are not limited by the fan components in the hot airstream and can safely discharge at the maximum allowable limit for CSA certified direct fired applications. Draw-through units place the blower after the burner and have a lower LAT and ∆T due to limitations of the fan components in the hot air stream. Each of these systems has a specific purpose for large industrial spaces. For heating driven applications, maximizing the BTU to CFM ratio maximizes efficiency ...

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The Right Solution For Industrial Cooling Lies Somewhere Between DX Cooling And HVLS Fans

2 MIN READ

Evaporative cooling can provide significant temperature relief at a fraction of the cost of mechanical cooling. Industrial settings - with much exhaust airflow for contaminants and a substantial footprint - can struggle to achieve clean and temperate indoor air conditions without expensive mechanical cooling systems. However, the sheer size of many of these facilities prices that technology out of the possible solution set. On the other end of the cooling option spectrum, HVLS fans tend to move the hot air around, dependent on contact cooling for temperature relief. The moving air from HVLS fans can help employees feel more comfortable but cannot address internal heat gains within a facility nor provide temperature relief. Somewhere between those two options stands evaporative cooling technology, which provides tempered make-up air while also improving indoor air quality with the usage of 100% outdoor air.    Two-Stage Evaporative Cooling Technology Shines in Industrial Facilities The Cambridge ESC-Series evaporative cooling unit is a semi-custom fabricated air handler that can utilize direct (DEC), indirect (IEC) evaporative cooling, or a combination of both indirect/direct (two-stage) evaporative cooling to meet specific usage ...

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The Path to Net Zero Utilizing HTHV Technology

2 MIN READ

*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.