Hi Ask An Expert: Hi Hybrid Cooling In Power Generation of Critical Thinking & Discussion!.

6 Mar 2014

Hi Hybrid Cooling In Power Generation of Critical Thinking & Discussion!.

Hi Hybrid Cooling In Power Generation of Critical Thinking & Discussion!.

So What is Hybrid Cooling & Why Not Join Or View The Complete Online Discussion Forum On Sustainable Engineering by visiting the direct link for IHS Global Spec CR4 Forum Provided Below.

Hybrid cooling basically involves part direct air cooling of loop water that is being used to condense steam exhaust (from simple or combined cycle generation), along with some form of cooling that reduces the loop water temperature to slightly below ambient.

This is as compared to recirculating open- system cooling (cooling towers) that do not use as much water as once-through cooling, yet consume quite a bit more water (by evaporation and blow-down). Water resources in many areas are becoming taxed to their limits (or beyond), thus it behooves the engineering community at large to think in ways that reduce drastically or eliminate water consumption in power generation.

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View articles on The Top 10 Predictions for US High Performance Building in 2014; & much more HVAC News & Industry Highlights

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GEA's HVAC Forum & Technology Blog Article Sourced Complete Sample Below;

10 Predictions for US High Performance Building in 2014

1. Focus will move beyond Net Zero Energy to Net Positive Energy buildings.

2. Market mechanisms that reward energy conservation and renewable energy production will flourish.

3. Building energy codes will move away from prescriptive rules toward performance-based measures.

4. CO2 heat pumps will help transform heating and cooling performance.

5. US-made high performance windows will continue to make high performance building easier here.

6. Builders and designers of high performance homes will design ventilation systems with a focus on quality of ventilation rather than just quantity.

7. The US-led move to make Passive House more climate-specific will improve performance at both micro and macro levels.

8. Passive House competition will result in better software tools for high performance building practitioners.

9. Europe's push to eliminate thermal bridges in buildings will make high performance building more mainstream in the US, too.

10. China's interest in high performance building will propel US market.

(Hi) Protect Fans From Wind Milling.

Fan wind milling is very common in our industry. When a motor is not operating, in many cases a fan will be rotating in the wind. Sometimes this is caused by the wind and other times by an updraft in the tower. The fan can turn forward and sometimes in reverse. This can be damaging to the fan and stack if the wind gusts are high enough to cause the stack to deflect and contact the fan. When fan blade tips contact stacks, there is usually damage to the blades and the stacks. Higher winds cause more stack deflection and more deflection causes more blade contact which causes more damage. Fans should be locked down and held stationary during high wind conditions; especially hurricanes. The best way to safely stop these fans is a braking system that can quickly lock-out the mechanical set during a plant lock-down prior to a hurricane. This lock-out system should be easy and take less than one minute per fan. The brake should be designed to not slip during high winds. It should not be capable of coming loose or disengaging during hurricane gusts. During high wind condition when the fan is stationary, the stack may still deflect, but there is no rubbing activity causing wear which will eventually damage the blades and stacks. With a brake there will be no fan damage and no stack damage.

Hi AMCA Green Tip #5: Minimize Air System Leakage.

System leakage is typically expressed as a percentage of fan airflow at maximum operating conditions. Measurements by Lawrence Berkeley National Laboratory (LBNL) of system leakage in large commercial buildings in California found that adding 15% leakage at operating conditions leads to a fan power increase of 25% to 35%. Simulations performed by LBNL also found that a leakage rate of 19% compared to a "tight" system (5% leakage) can cause a 40% to 50% increase in fan-energy usage, and an increase of 2% to 14% of the total annual HVAC energy consumption. The study reported that this amounts to $7,400 to $9,500 per VAV system per year in Year 2000 dollars and utility rates in California. Leakage-testing requirements are a growing trend in national and state codes and standards for energy efficiency and green buildings. ASHRAE, SMACNA (Sheet Metal and Air Conditioning National Association), SPIDA (Spiral Duct Association), and AMCA are developing new test procedures and product certifications around tighter air systems.

Look for a lot of new "system leakage" thinking and guidance in the 2012 ASHRAE Handbook: Systems & Equipment, which is just hitting the press.Consulting engineers and design-build contractors shoulder a large part of the responsibility for ensuring tight air systems at the design phase.

The first step is to work with the building owner to agree on the level of tightness (system leakage percentage) that the project merits, and then to specify air system components and sealants that will perform together as a system to meet the system leakage objective. Engineers also need to select a testing standard that contractors or commissioning providers will use to ensure the leakage objective is met.

6 Mar 2014

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6 Mar 2014

Hi Hybrid Cooling In Power Generation of Critical Thinking & Discussion!.

10 Predictions for US High Performance Building in 2014

Hi Compartment Fire Behavior "Tactical Ventilation".

Hi E Community Portal Trending Blog List.

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Hi Sustainable Recommendation!.

Rate Your Hi Blogging Experience On Hi Ask An Expert!

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Hi Tunneling Conference & Exhibition 2014.

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