[BLDG-SIM] DOE2.1e HP HEAT-EIR-FPLR Problems

[Chris Jones]

I am comparing the default DOE2.1e HP heating curves to the 
performance data from various manufacturers.  In particular the 
EIR-FPLR curve does not fit what the manufacturers show in their 
data.  The default curve shows the EIR dropping as the part load 
ratio drops.  My assumption is that PLR = Operating Capacity/Design 
Capacity.  With the Trane, McQuay, and Waterfurnace data, the EIR 
increases as the PLR goes down.  I am assuming that part load is a 
result of lower flow through the unit or from higher entering dry 
bulb temperature.  So when I do create my set of heating curves 
HEAT-EIR-FT, HEAT-CAP-FT and HEAT-EIR-FPLR, the performance is 
significantly worse than with the default DOE2.1e curves.

Am I misinterpreting how to plot the data points for the 
HEAT-EIR-FPLR curve?  Example from Trane:
COP     CAP             EIR     Ent DB  Ent WT  PLR     EIR/EIR 
Design  GPM     FPLR
4.2     112000  0.238   68              68              1.000   1.000 
                   24.5    (1.000, 1.000)
3.1     62675           0.323   70      20      0.560           1.355 
                           12.1    (0.560, 1.355)
3.1     64639           0.323   70      20      0.577           1.355 
                           18.4    (0.577, 1.355)
3.2     65641           0.313   70      20      0.586           1.313 
                           24.4    (0.586, 1.313)
3.3     71123           0.303   70      30      0.635           1.273 
                           12.1    (0.635, 1.273)
3.4     73541           0.294   70      30      0.657           1.235 
                           18.4    (0.657, 1.235)
3.4     74631           0.294   70      30      0.666           1.235 
                           24.4    (0.666, 1.235)
3.5     79943           0.286   70      40      0.714           1.200 
                           12.1    (0.714, 1.200)
3.6     82643           0.278   70      40      0.738           1.167 
                           18.4    (0.738, 1.167)
3.6     83991           0.278   70      40      0.750           1.167 
                           24.4    (0.750, 1.167)
3.7     88881           0.270   70      50      0.794           1.135 
                           12.1    (0.794, 1.135)
3.8     91903           0.263   70      50      0.821           1.105 
                           18.4    (0.821, 1.105)
3.9     93457           0.256   70      50      0.834           1.077 
                           24.4    (0.834, 1.077)
4       98031           0.250   70      60      0.875           1.050 
                           12.1    (0.875, 1.050)
4       101429  0.250   70      60      0.906           1.050 
                   18.4    (0.906, 1.050)
4.1     103173  0.244   70      60      0.921           1.024 
                   24.4    (0.921, 1.024)
4.2     107353  0.238   70      70      0.959           1.000 
                   12.1    (0.959, 1.000)
4.2     111199  0.238   70      70      0.993           1.000 
                   18.4    (0.993, 1.000)
4.3     113135  0.233   70      70      1.010           0.977 
                   24.4    (1.010, 0.977)
4.4     116795  0.227   70      80      1.043           0.955 
                   12.1    (1.043, 0.955)
4.4     121041  0.227   70      80      1.081           0.955 
                   18.4    (1.081, 0.955)
4.5     123169  0.222   70      80      1.100           0.933 
                   24.4    (1.100, 0.933)
4.5     126363  0.222   70      90      1.128           0.933 
                   12.1    (1.128, 0.933)
4.6     130957  0.217   70      90      1.169           0.913 
                   18.4    (1.169, 0.913)
4.7     133313  0.213   70      90      1.190           0.894 
                   24.4    (1.190, 0.894)

Thanks for any help!






Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005 

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