Question-and-Answer Resource for the Building Energy Modeling Community
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Hello,
When inputting the data for the Detailed HVAC, it is important to specify the COP (Coefficient of Performance) at the rated conditions, also known as the Reference COP.
The Reference COP is a numeric field that represents the chiller's coefficient of performance. This value is multiplied by the output of the chiller performance curves.
It's worth noting that the Reference COP should only account for the energy consumption of the chiller itself and should not include energy use attributed to pumps, evaporatively cooled or air-cooled condenser fans, or cooling tower fans. These auxiliary components should be considered separately.
When defining the Reference COP, it is crucial to ensure that the temperature and water flow rates align with the reference conditions. By doing so, you will accurately model the equipment's performance throughout the year, taking into account its variations based on different operating conditions.
Furthermore, when comparing the COP of the proposed equipment with the baseline according to the 90.1 App. G Table 6.8.1, it is important to use the same testing procedure. For instance, you cannot directly compare a SEER (Seasonal Energy Efficiency Ratio) value with an EER (Energy Efficiency Ratio) value, as they represent different testing methodologies and conditions.
I hope this explanation clarifies any confusion and assists you in effectively utilizing the Detailed HVAC feature.
