HVLS destratification fans - Applications, Benefits & Savings | Industrial

high volume low speed destratification fan HVLS

High Volume Low Speed destratification fans (better known as HVLS destratification fans) are able to provide great improvements in working environments, customer environments and livestock housings, and better operating conditions for many types of machinery. Due to their whisper-quiet operation (<60dBa) the Evel HVLS destratification fans are applicable across a wide range of environments including for example - restaurants, hotel lobbies, large open plan office places, atriums, conferance centres, warehouses, manufacturing environments and livestock buildings.

HVLS Destratification Fans ranging from 2.5m to 7m diameter are available

Stratification of air is due to the fact that hot air rises, leading to the temperature at ceiling level being higher than at ground level. It is generally accepted that in rooms with stratified air, the temperature differential is typically 2-3°C per 5m height but can be as much as 1°C/m height in some circumstances. In the worst case, this means that in a 10m high room the difference between temperature at floor level and ceiling level would be 10°C. To achieve a comfortable working environment of say 18°C therefore entails heating the ceiling to 28°C in this circumstance and the higher the ceiling the greater the potential temperature differential, and the greater the likely savings from implementing effective thermal destratification fans.

How do HVLS destratification fans work?

HVLS destratification fans take in the warmer ceiling air and transport it to the floor in a slow-moving column to create a better working environment and greatly reduce total energy consumption. In winter the most significant benefit is a considerable reduction in the cost of heating to create the optimum working/storage environment. During summer months HVLS destratification fans provide low-cost ventilation, reducing or eliminating the need for air conditioning.

When are HVLS destratification fans used?

HVLS Destratification Fan in use in a livestock application

These fans come into their own in larger applications where there is an economic advantage to using HVLS fans rather than typically up to 7 smaller conventional destratification fans. The increased cost per fan of HVLS fans will be offset by lower installation costs (particularly power and control cabling), lower ongoing operating costs (due to far more efficient motors and responsive control systems) and lower future maintenance costs (due to lower speed and automated, variable speed operation).

Where are HVLS destratification fans used?

In retail or manufacturing situations it is necessary to maintain a comfortable environment to maximise customer enjoyment and / or employee productivity. In high-tech environments a stable controlled environment is required for efficient operation of electronic equipment.

In warehousing it is often necessary to maintain certain air quality standards including temperature and humidity in order to maintain the quality of the stored materials. Similar requirements apply to indoor sports arenas. HVLS destratification fans are ideal for such applications as they are able to respond rapidly to changing environmental conditions.

Enclosed or semi enclosed livestock buildings such as poultry sheds, livestock wintering buildings and cow milking parlours will enjoy the benefits of energy savings and enhanced productivity and improved animal welfare when HVLS destratification fans are put in place.

'Evel' range of HVLS destratification fans

All Evel HVLS destratification fans incorporate brushless motor technology with integrated inverter to give optimum efficiency and also allowing remote control and/or monitoring of more complex environments. Fans may be controlled remotely as individual units or may be grouped together as a system and controlled by a central controller.

The 'WD' range - This range is particularly though not exclusively applicable to the Hotel / Restaurant / Small Commercial markets. These have 5 'Selig' profile fan blades with a diameters of 2.5 – 4 metres rotating at between 160 and 250rpm. These are suitable for ceiling heights up to 7 metres.
The 'WZ' range - This range is aimed at the Industrial / Large Commercial / Farming markets. These have 5 'Naca' profile fan blades with a diameters of 2.5 – 7 metres rotating at between 38 and 250rpm. These are suitable for ceiling heights up to 12 metres.

Sizing your system

Selection of the most applicable size and the correct quantity of fans to gain maximum cost effectiveness in any particular situation is complex, because there are a number of other variables that conribute to the overall calculation.These include,

Ambient temperature outside
Materials of construction and how well insulated the building is
The efficiency of the heating system
The control accuracy of the heating system
The actual temperature differential pre destratification
The effectiveness of the destratification fans
The running costs of the destratification fans
The pricing structure of the running cost to your heating system

Help and advice

If you would like to find out more or to get advice on reaching an ideal air circulation system for your application then email us at [email protected] or call us on +44 (0)1729 824108

Heat Load	Watts	BTU
Average The Room Is A Normal Residential Room, Office, Reception Area Or Similar, Where There Is Not Overly Crowded With People, Computer And Office Equipment.
Above Average There Are Factors That Contribute To Additional Heat Being Generated In The Room E.G. Strong Lighting, Overcrowding With People And Office Equipment, Conservatory Type Room, Or Flat Roofed Room.
High There Are Factors That Contribute To A High Heat Load In The Room. E.G. Commercial Cooking, Much Computer And Server Equipment, Switchgear, Temporary Building With Thin Walls And Flat Room, Plain Glass Conservatory.

Variable	Units	Notes/Guidance
System Airflow	M3/Hr	If you have it in cfm then multiply your cfm value by 1.7 to get m3/hr
Average Combined Pressure Drop Of Filters Of Higher Than F6 Efficiency	Pascals	F8 bag filters pressure drop - typical clean clean to dirty, 160 - 250 Pascals F9 compact filters pressure drop - typical clean to dirty, 160 - 350 Pascals H10 HEPA filter pressure drop - typical clean to dirty, 250 - 600 Pascals 9.8 Pascals = 1 mm wg, & 249 Pascals = 1 inch wg
Carbon Filters Pressure Drop	Pascals	For compact type carbons pressure drop between 100 - 150 Pa Bonded carbon panels typically 150 - 170 Pa Loose granular carbon panels typically 130 Pa
Annual Operational Hours	Hrs/Annum	8760 hours in a year If operating for 5 days a week, excluding public holidays, for 12 hrs/day = 3000 hrs
Cost Of Power	Pence Per Kwh	Huge variance in what different companies pay. heck your last bill to be sure, otherwise put in 10p
Fan Efficiency	(As Decimal Value, Eg 100%=1)	Would typically be around 60%, so if you don’t have specific information use 0.6
Fan Motor Efficiency	(As Decimal Value, Eg 100%=1)	Larger motors should be around 90%, so if you don’t have specific information use 0.9

The Total Average Pressure Drop Over Your Higher Efficiency Filters And/Or Carbon Filters Is;		Pascals
This Pressure Drop Is Costing In Energy Alone	£	Per year
It Is Probable That A Sanuvox In-Duct System Could Break Down The Biological, Chemical And Odourous Contaminants On This Air Flow For Between 16 And 25% Of This Running Cost	£	Lower energy cost estimate of an equivalent Sanuvox system (16%)
	£	Higher energy cost estimate of an equivalent Sanuvox system (25%)

Type Of Building	Kw Range		BTU Range
Sports Centres
Retail Premises
Office Premises
Small Industrial Unit
Medium Industrial Units
Larger Industrial Buildings
School/Community Halls
Churches

Room/building volume	m3
Temperature differential (deltaT °C)	°C

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