Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Table 2.3 of Enhancements to ASHRAE Standard 90.1 Prototype Building Models (PNNL 2014) describes the behavior, it represents 23 separate 50 gallon hot water heaters. So while both Hi-Rise and Mid-Rise are modeled as a single water heater, the Mid-Rise water unit is representing a non-centralized system, and as a result has a higher combined storage capacity.
This is also addressed in Appendix A.1.1 (Water Heater Type) and Table A.4. (Total Pipe Thermal Loss For Prototype Buildings) in the same document.
| | 2 | No.2 Revision |
Table 2.3 2.2 of Enhancements to ASHRAE
Standard 90.1 Prototype Building
Models (PNNL 2014) describes the behavior, it represents 23 separate 50 gallon hot water heaters. So while both Hi-Rise and Mid-Rise are modeled as a single water heater, the Mid-Rise water unit is representing a non-centralized system, and as a result has a higher combined storage capacity.
This is also addressed in Appendix A.1.1 (Water Heater Type) and Table A.4. (Total Pipe Thermal Loss For Prototype Buildings) in the same document.
