Performance Characteristics at 44.6°F (7°C)
Bold blue lines indicate rated design conditions. Where these lines cross designate the Standard Rating Point.
All curves are based on water in all circuits flowing at rated design condition flow rates.
Heating Efficiency = 97%
Performance may be interpolated but must not be extrapolated.
Expanded performance curves are provided for reference only. Contact Yazaki Energy Systems, Inc. to obtain certified performance ratings from the f ac t ory or t o det ermine performance at other conditions outside the scope of this publication.
Performance data based upon standard fouling factor of 0.0005 ft^{2}hr°F/BTU in all circuits.
Absorption Chiller Heat Balance
Heat in = Heat out  
Qg + Qe = Qc  
Where:  Qg = Actual Heat Input to Generator  
Qe = Actual Cooling capacity  
Qc = Actual Heat Rejected to Tower  
Cooling Capacity  
Qe = CCF x HMFCF x RCC  
Where:  Qe = Actual Cooling Capacity  
CCF = Cooling Capacity Factor  
HMFCF = Flow Correction Factor  
RCC = Rated Cooling Capacity  
Heat Input (Cooling)  
Qg = HIF x HMFCF x RHI  
Where:  Qg = Actual Heat Input to Generator  
HIF = Heat Input Factor  
HMFCF = Flow Correction Factor  
RHI = Rated Heat Input  
Heating capacity  
Qh = HCF x HMFCF x RHC  
Where:  Qh = Actual Heating Capacity  
HCF = Heating Capacity Factor  
HMFCF = Flow Correction Factor  
RHC = Rated Heating Capacity  
Heat Input (Heating)  
Qg = Qh / 0.97  
Where:  Qg = Actual Heat Input to Generator  
Qh = Actual Heating Capacity  
Temperature Difference (^{o}F)  
T = Qx in Mbtuh / (0.5 x Qa)  
Where:  = Temperature Difference  
Qx = Actual BTUH Transferred  
Qa = Actual Flow Rate in GPM  
Press. Drop for Nonstandard Flow (PSI)  
Pa = Pr x (Qa / Qr)^{2}  
Where:  Pa = Actual Pressure Drop  
Pr = Rated Design Pressure Drop  
Qa = Actual Flow Rate in GPM  
Qr = Rated Design Flow Rate GPM  

Example 1:  

Heat medium input temperature..........195°F  
Heat medium flow............................114.1 GPM  
Cooling water inlet temperature..........85.1°F  
Cooling water flow...........................242.5 GPM  
Chilled water outlet temperature.........44.6°F  
Hot water outlet temperature.............131°F  
Chilled/hot water flow........................72.6 GPM  
Chillerheater model.......WFCSH30  
Refer to Performance Charts for Curves (Page 7) and to Specifications (Page 5) for Rated Design Information on the Model WFCSC/SH30. 

1.  Available Cooling Capacity:  
CCF at 195°F Heat Medium = 1.12  
Heat Medium Flow = 114.1 / 114.1 = 100%  
HMFCF for 100% Flow Rate = 1.0  
Rated Cooling Capacity = 360.0 Mbtuh  
Qe = 1.12 x 1.0 x 360.0 = 403.2 Mbtuh (33.6 T)  
 
Chilled Water P= 10.1 * (72.6/72.6)^{2} = 10.1 PSI  
2.  HEAT INPUT (COOLING):  
HIF for 195°F Heat Medium = 1.177  
HMFCF for 100% Flow Rate = 1.0  
Rated Heat Input = 514.2 Mbtuh  
Qg = 1.17 x 1.0 x 514.2 = 601.6 Mbtuh Heat Input  
 
Heat Medium P = 8.8 * (114.1 / 114.1)^{2} = 8.8 PSI  
3.  HEAT REJECTED TO COOLING TOWER:  
Qc = Qg + Qe  
Qc = 601.6 + 403.2 = 1004.8 Mbtuh  
Required minimum flow rate = 242.5 GPM  
The cooling tower selected must be capable of rejecting a minimum of 1004.8 Mbtuh at a minimum flow rate of 242.5 GPM.  


Cooling Water P = 6.7 * (242.5/242.5)^{2} = 6.7 PSI  
4. 
AVAILABLE HEATING CAPACITY:  
HCF at 195°F Heat Medium = 1.12  
HMFCF for 100% Flow Rate = 1.0  
Rated Heating Capacity = 498.9 Mbtuh  
Qh = 1.12 x 1.0 x 498.9 = 558.8 Mbtuh  


Hot Water P = 10.1 * (72.6 / 72.6)^{2} = 10.1 PSI  
5. 
HEAT INPUT (HEATING):  
Qg = Qh / 0.97 = 558.8 / 0.97 = 576.1 Mbtuh Heat Input  


Heat Medium P = 8.8 * (114.1 / 114.1)^{2} = 8.8 PSI 
Example 2:  

Heat medium input temperature..........203°F  
Heat medium flow............................57.0 GPM  
Cooling water inlet temperature..........85.1°F  
Cooling water flow...........................242.5 GPM  
Chilled water outlet temperature.........44.6°F  
Hot water outlet temperature.............131°F  
Chilled/hot water flow.......................72.6 GPM  
Chillerheater model........WFCSH30  
Refer to Performance Charts for Curves (Page 7) and to Specifications (Page 5) for Rated Design Information on the Model WFCSC/SH30. 

1.  Available Cooling Capacity:  
CCF at 203°F Heat Medium = 1.22  
Heat Medium Flow = 57.0 / 114.1  
Heat Medium Flow = 50%  
HMFCF for 50% Flow Rate = 0.86  
Qe = 1.22 x 0.86 x 360.0 = 377.7 Mbtuh (31.5 T)  
 
Chilled Water P= 10.1 * (72.6 / 72.6)^{2} = 10.1 PSI  
2.  HEAT INPUT (COOLING):  
HIF at 203°F Heat Medium = 1.35  
HMFCF for 50% Flow Rate = 0.86  
Rated Heat Input = 514.2 Mbtuh  
Qg = 1.35 x 0.86 x 514.2 = 597.0 Mbtuh Heat Input  
 
 
3.  HEAT REJECTED TO COOLING TOWER:  
Qc = Qg + Qe  
Qc = 597.0 + 377.7 = 974.7 Mbtuh  
Required minimum flow rate = 242.5 GPM  
The cooling tower selected must be capable of rejecting a minimum of 974.7 Mbtuh at a minimum flow rate of 242.5 GPM.  


Cooling Water P = 6.7 * (242.5 / 242.5)^{2} = 6.7 PSI  
4. 
AVAILABLE HEATING CAPACITY:  
HCF at 203°F Heat Medium = 1.33  
HMFCF for 50% Flow Rate = 0.86  
Rated Heating Capacity = 498.9 Mbtuh  
Qh = 1.33 x 0.86 x 498.9 Mbtuh = 570.6 Mbtuh  


Hot Water P = 10.1 * (72.6 / 72.6)^{2} = 10.1 PSI  
5. 
HEAT INPUT (HEATING):  
Qg = Qh / 0.97 = 570.6 / 0.97 = 588.2 Mbtuh Heat Input  


