Premier Laboratory Systems Logo *
 
About Premier Laboratory systems logopremier laboratory systems services imagepremier laboratory systems products imagecontact premier laboratory systems imagepremier laboratory systems image
 
Premier Laboratory Systems Products

Please choose from the following links for further product information:


Fume cupboards - Enterprise DynamicFlow™


Fume cupboards - conventional


Recirculating Fume cupboards


Class II Safety Cabinets


Air management


LEV and ancillary equipment


* * *

Fume Cupboards - Enterprise Dynamic Flow ™


Energy Conservation Calculations


It is a simple calculation to compare the energy consumption of an installation using conventional fume cupboards and an installation utilising Premier’s new Enterprise DynamicFlow fume cupboards. The following calculations are based on a typical installation employing thirty 2m wide fume cupboards.


The volume of air consumed by a conventional fume cupboard is a constant figure calculated by:-
Sash open width (m) x sash open height (m) x face velocity (m/sec).
So for a 2m wide cupboard:-
1.7 (m) x 0.5 (m) x 0.5 (M/sec) = 0.425 m3/sec.


The total extract volume from a laboratory equipped with thirty conventional fume cupboards would therefore be:-
30 x 0.425 m3/sec = 12.75 m3/sec (45,900 m3/hour).


This volume of air will be replaced by the supply air system plus a small quantity of air drawn from adjacent areas to maintain a negative pressure within the laboratory. This air would be heated/cooled from the ambient air temperature to the desired laboratory air temperature (typically 21°C).


Assuming an average day time temperature for the UK of 9°C over the whole year, the average energy consumption per hour is given by the formula:-
Volume (m3/sec) x temperature rise (t°C) x 1.21 (constant for air)


In this case:-
Average Consumption = 12.75 m3/sec x 12°C x 1.21 = 185 kW (per hour)
Assuming a fume cupboard usage of 8hrs/day, 5 days/week and 48 weeks/year, the average annual energy consumption for a conventional fume cupboard would be:-
Annual Consumption = 185kW x 8 hrs/day x 5 days/week x 48 weeks/yr = 355,200 kWh/yr.


As the Enterprise DynamicFlow fume cupboard operates on a face velocity of 0.25 m/sec as opposed to 0.5 m/sec the required volume is 50% lower than the equivalent conventional fume cupboard.


Therefore: Average Energy Consumption = 355,200 x 0.5 = 177,600 kWh/yr


The above figures are given as a guide to the potential energy savings when utilising Enterprise DynamicFlow instead of conventional fume cupboards.


The calculations do not include for any cooling requirements which can be calculated using a similar method.


The typical cost per kWh used in the UK is 0.10 and is based on a combination of direct fuel costs, plant maintenance, and depreciation of plant, ie a true cost of energy.


Applied to the examples above, the total running cost for a ‘conventional’ versus an Enterprise DynamicFlow installation can be stated in general terms as follows:


Fume Cupboard Type

Energy Costs (per yr)

Conventional:

£35,520

Enterprise DynamicFlow:

£17,760

Saving:

£17,760


*
* Introduction to Enterprise DynamicFlow™ Fume Cupboard
* Principles of Enterprise DynamicFlow™ Fume Cupboard
* Testing and Validation
* Summary of User Benefits
* Energy Conservation Calculations
 
*