ASHRAE-90.1-2022- - Page 221

Extracted Content

Table 12.5.1 Modeling Requirements for Calculating Design Energy Cost and Energy Cost Budget (Continued)

Proposed Design (Column A) Design Energy Cost (DEC)	Budget Building Design (Column B) Energy Cost Budget (ECB)
11. Service Water-Heating Systems
The service water-heating system type and all related performance parameters, such as equipment capacities and efficiencies, in the proposed design shall be determined as follows: Where a complete service water-heating system exists, the model shall reflect the actual system type using actual component capacities and efficiencies. Where a service water-heating system has been designed and submitted with design documents, the service water-heating model shall be consistent with design documents. Where no service water-heating system exists or has been submitted with the design documents, no service water heating shall be modeled. Piping losses shall not be modeled.	The service water-heating system type in the budget building design shall be identical to the proposed design. The service water-heating system performance of the budget building design shall meet the requirements of Sections 7.4 and 7.5. Exceptions: If the service water-heating system type is not listed in Table 7.4-1, it shall be determined based on Table G3.1.1-2. Where Section 7.5 applies, the boiler shall be split into a separate space-heating boiler and hot-water heater with efficiency requirements set to the least efficient allowed. For 24-hour facilities that meet the prescriptive criteria for use of condenser heat recovery systems described in Section 6.5.6.2, a system meeting the requirements of that section shall be included in the baseline building design, regardless of the exceptions to Section 6.5.6.2.2. If a condenser heat recovery system meeting the requirements described in Section 6.5.6.2 cannot be modeled, the requirement for including such a system in the actual building shall be met as a prescriptive requirement in accordance with Section 6.5.6.2 and no heat recovery system shall be included in the proposed design or budget building design. Service water-heating energy consumption shall be calculated explicitly based on the volume of service water heating required, the entering makeup water, and the leaving service water heating temperatures. Entering water temperatures shall be estimated based on the location. Leaving temperatures shall be based on the end-use requirements. Service water loads and use shall be the same for both the proposed design and baseline building design and typical of the proposed building type. Piping losses shall not be modeled.
12. Miscellaneous Loads
Receptacle, motor, and process loads shall be modeled and estimated based on the building area type or space type category and shall be assumed to be identical in the proposed and budget building designs. These loads shall be included in simulations of the building and shall be included when calculating the energy cost budget and design energy cost. All end-use load components within and associated with the property shall be modeled, unless specifically excluded by Table 12.5.1(14), including but not limited to exhaust fans, parking garage ventilation fans, exterior property lighting, swimming pool heaters and pumps, elevators and escalators, and cooking equipment. Where power and other systems covered by Sections 8 and 10 have been designed and submitted with design documents, those systems shall be determined in accordance with Sections 8 and 10. Where power and other systems covered by Sections 8 and 10 have not been submitted with design documents, those systems shall comply with but not exceed the requirements of those sections.	Same as proposed design.
13. Refrigeration
Where refrigeration equipment in the proposed design is rated in accordance with AHRI 1200, the rated energy use shall be modeled. Otherwise, the proposed design shall be modeled using the actual equipment capacities and efficiencies.	Where refrigeration equipment is specified in the proposed design and listed in Table 6.8.1-11, the budget building design shall be modeled as specified in Table 6.8.1-11 using the actual equipment capacities. If the refrigeration equipment is not listed in Table 6.8.1-11, the budget building design shall be modeled the same as the proposed design.
14. Modeling Exceptions
All elements of the proposed design building envelope, HVAC, service water heating, lighting, and electrical systems shall be modeled in the proposed design in accordance with the requirements of Table 12.5.1(1) through (13).	None.