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E+ VRF model heat recovery mode curves

asked 2019-01-18 17:05:41 -0600

khaddad gravatar image

updated 2019-01-21 15:02:43 -0600

The E+ model for 'airconditioner:variablerefrigerantflow' does not have defaults for the following curves:

, !- Heat Recovery Cooling Capacity Modifier Curve Name , !- Heat Recovery Cooling Energy Modifier Curve Name , !- Heat Recovery Heating Capacity Modifier Curve Name , !- Heat Recovery Heating Energy Modifier Curve Name

Can someone recommend sources/references for these?

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answered 2019-01-29 12:33:14 -0600

updated 2019-01-29 12:33:59 -0600

This information is extremely hard to find or unavailable. There was laboratory testing that showed some differences in VRF performance when heat recovery mode is active. However, there was not enough information to create performance curves for heat recovery. Only use these curves if you have the information to create them.

Example inputs for VRF heat recovery mode simulation. You can revise these as needed. See Engineering Reference sections Heat-Recovery-Cooling-Capacity-Modifier, Transition from Cooling Only mode to Heat Recovery mode' andHeat Recovery Cooling Capacity Fraction and Time Constant` for more detailed discussion.

-5,                           !- Minimum Outdoor Temperature in Heat Recovery Mode {C}
26.2,                         !- Maximum Outdoor Temperature in Heat Recovery Mode {C}
,                             !- Heat Recovery Cooling Capacity Modifier Curve Name
0.5,                          !- Initial Heat Recovery Cooling Capacity Fraction {W/W}
0.15,                         !- Heat Recovery Cooling Capacity Time Constant {hr}
,                             !- Heat Recovery Cooling Energy Modifier Curve Name
1,                            !- Initial Heat Recovery Cooling Energy Fraction {W/W}
0,                            !- Heat Recovery Cooling Energy Time Constant {hr}
,                             !- Heat Recovery Heating Capacity Modifier Curve Name
1,                            !- Initial Heat Recovery Heating Capacity Fraction {W/W}
0.15,                         !- Heat Recovery Heating Capacity Time Constant {hr}
,                             !- Heat Recovery Heating Energy Modifier Curve Name
1,                            !- Initial Heat Recovery Heating Energy Fraction {W/W}
0;                            !- Heat Recovery Heating Energy Time Constant {hr}
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Asked: 2019-01-18 17:05:41 -0600

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Last updated: Jan 29