- Video Introduction of the New Aztec AMC Evaporative Cooling Air Turnover System
- Designing Data Centers as Thermos Bottles
- A New Video on YouTube Describing How the Aztec Evap System Works
- Aztec To Be In Capacity North America Exhibit Hall
- Virtual Reality
- A Simple Concept That Saves Big Dollars
- Indirect Evaporative Cooling Research Project Launched
- Canadian Patent Granted for Mestex Digital High Turndown Burner
- So You Think Your Critical HVAC System Is Reliable?
- Aztec Provides Fresh Air Intake Penthouses for Data Centers in Northwestern US
- Credibility and Trust
- How I Spent My Summer Vacation
- Too Hot to Handle? A Simple Reminder.
- Preaching to the Choir
- Evaporative Cooling Anaysis for Data Modules in Two Diverse Climates
- Aztec Indirect Evaporative Cooling System on Display at DFW ASHRAE Golf Outing
- How We Used To Do It
- Air Pollution and HVAC
- Mestex, Division of Mestek YouTube Channel
- Aztec Evaporative Cooling for Data Centers at Data Center World
- GreenBuild Toronto
- Trane Division of Ingersoll-Rand in Lawsuit Over Wireless Technologies
- New BIM Objects From The Aztec Brand
- DOE Proposes Building Rating System
- The Importance of Correct Static Pressure for Direct Fired Make-Up Air Equipment
- Instant Online Document Lookup Using Microsoft Tags
- Do Evaporative Cooling Systems Use Too Much Water?
- Sustainability at Mestek Dallas
- Facebook Offers Their Outside Air Cooling Solution To All Data Center Owners
- Restaurant Energy Saving Idea That Can Be Used Anywhere
- Planning for Volatility
- Ever Wonder Where the Power Goes in a Data Center?
- ASHRAE TC 9.9 Expands Data Center Temperature Ranges Again
- Green Buildings Get Another Boost
- ASHRAE Show Report
- The Story of SHR or Why My Classroom is Stuffy
- CFD, Air Turnover, and the Pharmaceutical Industry
- It is not sustainable if it is not maintainable... or if it breaks down
- Accounting Rule Change Might Impact HVAC
- Reduce electrical demand load with an Aztec indirect evaporative cooling unit
- Lower Cost of Ownership with the Applied Air FAP
- Everything You Want to Know in a Flash
- Data Centers and Evaporative Cooling Webinar August 23
- New "Green" Product Announcement
- DDC Application Case Studies
- PowerPoint showing the importance of gas pressure, static pressure, and voltage
- Webinar: 'The Importance of Correct Gas Pressure, E.S.P. and Voltage'
- An Old Solution to a New Problem
Shading and Make-Up for Building Designers
I just returned from a meeting in Florida and I was reminded of a couple of basic concepts that apply to virtually all building designs.
Our meeting room faced an outside wall with a couple of French doors to a nice patio area. The weather was unusually cool for Florida and everyone sitting on that side of the table was able to experience that coolness first hand...even though the doors were closed. During breaks the smokers in the group would gather on the patio and, again, in spite of closed doors the meeting room started to smell of cigarette smoke.
The problem, of course, was a lower pressure in the meeting room compared to the outdoors. Somewhere in the conference center there was an exhaust system churning away without a counterbalancing make-up air system. The only way that the exhaust system could satisfy its demand for air was to pull that air from outside the building, through the conference room, to its final point of exit. Cold, smoke-laden air was drawn into the meeting room and occupant comfort was compromised. Simply adding a make-up air system similar to the Applied Air DFL-series would have improved the indoor environment and cost very little extra to operate. Remember that all of that cold air that was being sucked into the building caused the occupants to raise the thermostat set-point in order to compensate for being cold and forced the large main air handlers to operate for more hours than necessary. Maintaining a positive pressure in buildings controls infiltration of smoke, dust, and un-tempered air and it is relatively simple to achieve.
The other basic concept that popped into my head is how important the building envelope is to controlling operating costs. This particular resort was built many years ago but employed some pretty effective passive shading for the guest rooms. My room had a wall of windows for natural light and a view but had a deep setback that prevented direct solar radiation. This deep setback meant that the air conditioning system would see far fewer operating hours than an unprotected glass exposure would allow. Since solar radiation is also a significant portion of the building cooling load the setbacks allowed a reduction in HVAC equipment size as well.
Building design has changed since the days when this hotel was built and deep setbacks are much less common. But effective solar shading is still feasible through the use of external shades and louvers. External shade technology has advanced to the point where it is possible for the shades to track the location of the sun and automatically provide continuous reduction in solar radiation. Some external shading systems such as those developed by Colt Group actually contain photovoltaic cells that can reduce the building electrical demand by more than providing shading alone.
So two basic concepts for sustainable building design: maintaining a positive indoor pressure to eliminate unwanted and untreated outside air from entering the occupied areas; and using modern external shading technology to reduce the solar load in the occupied areas which, in turn, reduces operating and capital costs.