Daikin AIR COOLED VRV ESTIMATED ENERGY USAGE & RUNNING COST CALCULATION
           
           
    Cooling Heating   Heating Use Factor 0.5
WORKING DAYS PER YEAR 130 235      
OPERATION HOURS PER DAY 10     Y/N  *8
ESTIMATED AREA OF CONDITIONED SPACE (m2)     IS VRV 2P HP? N
COST OF ELECTRICITY per kWhr (Pence) 9   IS VRV 3P HR? Y
           
    SUMMER   WINTER  
Condensing Units AMBIENT 29C AMBIENT 10C   AMBIENT -5C AMBIENT -5C
(Power Input at Average Index)   MAXIMUM POWER AVERAGE POWER   MAXIMUM POWER AVERAGE POWER
TYPE No SYSTEMS INPUT (kW) INPUT (kW) *1   INPUT (kW) INPUT (kW) *7
RX(Y/E)Q20P 1 9.78 6.42   13.60 10.90
             
TOTAL INDEX 650.00 9.78 6.42   13.60 10.90
           
Fan Coil Units     MAXIMUM POWER AVERAGE POWER  
MODEL *3 No FCU TOTAL INDEX 100% INPUT (kW) *6 10% DIV (kW) *4  
20 0 0.00 0.00 0.00  
25 8 200.00 1.10 0.99  
32 7 218.75 1.29 1.16  
40 0 0.00 0.00 0.00  
50 2 100.00 0.55 0.50  
63 2 125.00 0.51 0.46  
80 0 0.00 0.00 0.00  
100 0 0.00 0.00 0.00  
125 0 0.00 0.00 0.00  
140 0 0.00 0.00 0.00  
200 0 0.00 0.00 0.00  
250 0 0.00 0.00 0.00  
           
TOTALS 19 643.75 3.45   3.11  
           
Ventilation (VAM's)            
TYPE No VAM UNITS POWER INPUT (kW)*6     TOTAL INSTALLED COOLING CAPACITY
1500/2000 0 0.00     SENSIBLE (kW) TOTAL (kW)
800/1000 0 0.00     47.28 59.10
650 0 0.00        
350/500 0 0.00     AVERAGE INSTALLED COOLING CAPACITY
150/250 0 0.00     SENSIBLE (W/m2) TOTAL (W/m2)
TOTALS 0 0.00     #DIV/0! #DIV/0!
           
Summary            
At Average Conditions Cost /m2/Year kWhr/year Cost /kWhr Total Cost ()
FAN COILS ONLY #DIV/0! 11,333.25 0.090 1,019.99
VAM'S ONLY   #DIV/0! 0.00 0.090 0.00
COOLING ONLY SYSTEMS #DIV/0! 0.00 0.090 0.00
HEAT PUMP SYSTEMS *8 #DIV/0! 0.00 0.090 0.00
HEAT RECOVERY SYSTEMS *2 *8 #DIV/0! 33,957.75 0.090 3,056.20
GRAND TOTALS   #DIV/0! 45,291.00   4,076.19
           
POWER INPUT AT  kW 19.30
AVERAGE RUNNING CONDITIONS (Shaded) 10.34 AMPS/
           
POWER INPUT AT kW 26.83
MAXIMUM LOAD CONDITIONS (for Electrical Loading) 14.75 AMPS/
             

*1) It is assumed the VRV Systems will operate continuously at 50% of their installed maximum capacity, for the indicated HOURS/DAYS

*2) For Heat Recovery, an arbitary diversity factor of 15% has been used for Heat Recovery mode (Simultaneous Cooling/Heating).

*3) FCU Power INPUT is taken as the MAXIMUM in the range for each of the sizes.  All Power Inputs are measured at HIGH Speed.

*4) FCU are assumed to operate 100% during WORKING HOURS with 10% diversity for LOW speed use and units that are OFF.

*5) The running costs are based on AVERAGE power requirements. MAXIMUM power is for Electrical Supply Designs.

*6) FCU & VAM Units are SINGLE PHASE and are assumed to be loaded equally across the THREE PHASE Supply of AC System.

*7) Heating Factor is the Ratio of Calculated Heating Load to Installed Heating Capacity, which reflects the Average Power Input

*8) It is necessary to identify VRV systems as either Heat Pump or Heat Recovery, if Heat Recovery *2 Applies