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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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Video Animation: S-Series HTHV in a Car Wash Application

1 MIN READ

The car wash industry is one of the fastest-growing industries in the U.S., valued at a record $14.21 billion in 2020 and expected to expand 4.8% annually from 2021 to 2028. Based on conversations with industry leaders, a significant portion of their profit comes in the winter months; however, outside winter weather conditions paired with open bay doors present a challenge to keeping the tunnel warm enough for the car wash equipment to stay optimally functional. Closing the bay doors to retain heat is not an option because people may assume it is not open for business if the tunnel doors are closed. 

When addressing the conditions specific to that type of facility, heating and ventilating a car wash tunnel can be challenging. Corrosive chemicals, high humidity and open tunnel doors all present obstacles to effectively heat the tunnels.

In this application, the Cambridge S-Series HTHV heater minimizes freeze-up conditions, thus reducing downtime and lost profits.