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PERFECT COMBINATION OF HVLS FAN & COOLING SYTEMS FOR BIG SPACE
Big space requires huge airflow to ventilate the whole inside, There are many choices to do this work by mechanical ventilation method such as axial fan, centrifugal fan, air cooler, HVAC system, ceiling fan…However, the matched choice will be the solution that adapt certain requirements which come from User and Investors. In order to meet the requirements listed as below is not an easy step
- Well ventilated: air exchange in-n-out evently + controlled temperature & moisture
- Safety & Space optimization
- Economic Investment: Equipment + installation
- Low cost operation: power consumption + repair & maintenance
With the above requirements, we can look at below selection:
- HVAC / Chiller System.
– Very good in term of controlling moisture, temperature however the investment cost is very high and operation cost also a big number. Therefore this solution will be used in case of strictly controlling temperature and humidity in office, building, cooling warehouse, factory…Here are points need to consider when we choose it:
– Well ventilated, well control temp & humidity
– Safe and can be optimize the usage space
– High investment of equipment & ducting, installation & accessories
– High operation cost: electricity, repair & maintenance
- Air Cooler system
The AirCooler system is also a pretty good solution and widely used factories today, for this solution we can reduce the temperature relatively lower than the outside from few celsius degrees to nearly 10 degrees. However its hard to control humidity and temperature as desired.
– The investment cost of this system is quite low compare to HVAC & Chiller. The system also requires an ducting system to distribute the cooled air throughout the area. Thus, the cost of equipment, Accessories and manpower to install the system is also known not small.
– The maintenance cost of this system is also quite high and requires quite regular maintenance to maintain the efficiency and longevity of the system.
This solution will be suitable for places where strict temperature control is not required, deep cold, no humidity control is required, open installation spaces are more ideal because with enclosed spaces moisture accumulation Over time, it will negatively affect the internal environment.
- HVLS Fans
– Fan, if we pay attention, we will see that it is an indispensable part in any ventilation system, cooling equipment for example in HVAC, Chiller or Air coolers systems, we all see the images of fans such as centrifugal, axial, ventilation fans in the system. Then we also see these fans are used alone and as a main equipment in factories, warehouses, buildings, … so it is clear that fans are an essential and indispensable part of anything related to “VENTILATION”
– The HVLS fan is a new solution, the fan is considered an industrial ceiling fan, with a size called “giant” compared to the ceiling fans we use so far. We normally see the size from 1.6m to1.8m is the largest, but the HVLS fan has a blade diameter from 2.4m to 7.3m, Because of such a “giant”, the HVLS fan should be used in large factories, warehouses with ceiling from 6m to 25m high. The fan can cover from few hundreds square meters to thousand square meters per fan.
– The fan System is well ventilated, increase air speed and air exchange and through this cooling affect will increase.
– Investment cost is low for the system including equipment & installation
– Operation cost is also low & very less maintenance
The solution will fit for big space with high ceiling such as factory, warehouse and open space. Its hard to applied to small and low ceiling spaces.
- Combination of HVLS & HVAC/Chiller
The outstanding advantages of HVAC & Chiller system for controlling temperature and humidity cof that we have clearly seen, but due to the high initial investment costs and the expensive operating costs, we always search for energy saving solution which support the system to increase the effeciency and reduce energy consumption.
– The combination of this air conditioning system with the HVLS system brings visible effects: Cutting initial investment costs by reducing capacity, reducing the relative ducting system, reduce operating costs and also reduce maintenance costs of the new system compared to the original system.
This solution has been applied quite widely in shopping malls, cool storage, factories in foreign countries and is also being applied more widely in Vietnam.
– The limitation of the solution is only applicable when we have a large space enough to install. There is a contrast that the HVAC / Chiller system will normally limit the ceiling height to avoid heat loss and reduce pressure to the system, but the HVLS system requires the space to be large enough, high enough to put the equipment up. Therefore, when designing, architects and engineers need to understand to determine the most suitable and most effective solution to pick.
– This solution will still perform well in terms of humidity, temperature & safety control & increase air convection even better than the original system.
– Operating costs will be 10-30% lower depending on the season compared to the original system
- Combination of HVLS & AirCooler System
Similar to the combination with the HVAC/Chiller system, Combining the AirCooler system with the HVLS system also brings about good results, the system will increase the efficiency of cooling, convection, and reduce humidity to a low levelc and reduce the risk of mold arising inside working environment due to long-term accumulation of high humidity. Equipment & Ductwork will also be reduced when used in conjunction with the HVLS system. Operating costs are therefore also significantly reduced.
|
HVAC/Chiller |
AirCooler | HVLS | HVLS + HVAC/Chiller | HVLS + AirCooler | |
| Control Temp. | Good | Manage inside temp around 24-30 ∘C | Lower 0.5-2 ∘C compare to outside temp | Good | Manage inside temp around 24-30 ∘C |
| Control Humidity | Good | No | No | Good | No |
| Increase Ventilation | Yes | Yes | Yes | Yes | Yes |
| Balance Temp. Stratification | Not good | Not good | Good | Good | Good |
| Increase Cooling Effect | x | x | x | ||
| Lower Energy Cost | x | x | x | ||
| Reduce Maintenance Cost | x | x | x | ||
| Investment Cost | High | Medium | Low | Reduce the capacity of HVAC/Chiler & Ducting & Accessories | Reduce designed capacity of Aircooler & Ducting system |