Field-tested cooling performance of gas-engine-driven heat pumps

ASHRAE Transactions, July, 2008 by Chang W. Sohn, Dudley J. Sondeno, Franklin H. Holcomb, James M. Stephens

Table 2. Average Unit Performance at Each Site in June 2007

Unit No.    Location       Total Gas    Total Electricity  Total Energy
                          Usage (Btu)      Usage (Btu)     Input (Btu)

GHP 17    Barstow MCLB     30585387         3846344          34431732

GHP 18      Luke AFB        324722           25751            350473

GHP 19     Nellis AFB      4613050           543170          5156220

GHP 20    Davis Monthan    5678512           540069          6218580
              AFB

GHP 21      Yuma MCAS      No Data          No Data          No Data

GHP 22    Fort Huachuca    3964040          596430           4560470

Unit No.    Location              Total         Average       Monthly
                                 Cooling        Ambient     Average COP
                             Delivered (Btu)  Temperature
                                              ([degrees]F)

GHP 17      Barstow MCLB        39419371          89.0         1.14

GHP 18        Luke AFB           396634           93.1         1.13

GHP 19       Nellis AFB         5545612           90.3         1.08

GHP 20    Davis Monthan AFB     9085239           87.3         1.46

GHP 21        Yuma MCAS         No Data         No Data      No Data

GHP 22       Fort Huachuca      5529903           82.3         1.12

Table 3. Average Unit Performance at Each Site in July 2007

Unit No.      Location       Total Gas       Total      Total Energy
                             Usage (Btu)  Electricity   Input (Btu)
                                           Usage (Btu)

GHP 17     Barstow MCLB       32059119      3824514       35883632
GHP 18       Luke AFB         14672023      1200469       15872492
GHP 19       Nellis AFB       12088853      1337513       13426367
GHP 20    Davis Monthan AFB   31932900      2945197       34878097
GHP 21        Yuma MCAS       13399273      2083706       15482979
GHP 22      Fort Huachuca      9234482      3257211       22491692


Unit No.       Location      Total Cooling  Average Ambient  Monthly
                               Delivered      Temperature    Average
                                 (Btu)       ([degrees]F)      COP

GHP 17      Barstow MCLB      41501316           94.0          1.16
GHP 18       Luke AFB         18523378           97.8          1.17
GHP 19       Nellis AFB       15206713           97.5          1.13
GHP 20    Davis Monthan AFB   48047973           92.0          1.38
GHP 21       Yuma MCAS        15658923           94.6          1.01
GHP 22      Fort Huachuca     29382233           76.9          1.31

Table 4. Average Unit Performance at Each Site in August 2007

Unit No.       Location      Total Gas     Total         Total
                               Usage     Electricity     Energy
                               (Btu)     Usage (Btu)   Input (Btu)

GHP 17      Barstow MCLB     28232781     3358931       31591712
GHP 18       Luke AFB        24802418     1965544       26767962
GHP 19      Nellis AFB       14949148     1770265       16719413
GHP 20    Davis Monthan AFB  No Data      No Data       No Data
GHP 21       Yuma MCAS       1859658      2396349       20992931
GHP 22      Fort Huachuca    7001973      1090627       8092601

Unit No.      Location         Total      Average        Monthly
                              Cooling     Ambient      Average COP
                             Delivered  Temperature
                               (Btu)    ([degrees]F)

GHP 17      Barstow MCLB     38848515       91.9         1.23
GHP 18       Luke AFB        38432618       95.5         1.44
GHP 19       Nellis AFB      20592164       92.8         1.23
GHP 20    Davis Monthan AFB  No Data       No Data      No Data
GHP 21       Yuma MCAS       10050071       92.9         1.10
GHP 22      Fort Huachuca                   75.5         1.24