Yazaki - Gas Fired Double-Effect Chiller-Heaters


CH-MG Series: 150 and 200 RT Cooling Capacities


Part Load IPLV Rating




ARI 560-2000 Integrated Part Load Value (IPLV) is a single number measure of part load cooling performance based on a weighted average of common building types, operating hours and average U.S.A. weather data.

Part load performance is often expressed as Coefficient of Performance (COP):

COP = Net Output / Net Input

IPLV =0.01A+0.42B+0.45C+0.12D

Where A, B, C and D are part load COP's at the following conditions:

POINT
COOLING CAPACITY (%)
COOLING WATER TEMP (˚F)
A
100
85.0
B
75
77.5
C
50
70.0
D
25
70.0

Since the minimum gas input to the chiller-heater is 30%, the corresponding cooling capacity at 70.0°F cooling water inlet is 33.6%. The equivalent COP at 25% cooling capacity (Point D) is calculated from this conditionto account for cycling.

POINT
COOLING CAPACITY(%)
COOLING WATER TEMP (˚F)
COP

ARI WEIGHTED FACTOR

WEIGHTED AVERAGE COP
A
100
85.0
1.200
0.01
0.012
B
75
77.5
1.283
0.42
0.539
C
50
70.0
1.346
0.45
0.606
D
25
70.0
*1.300
0.12
0.156
*Calculated as per ARI 560-2000
IPLV
1.313