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How to convert Ideal load into actual electricity consumption

asked 2015-02-24 03:58:25 -0500

Xandrika gravatar image

updated 2015-07-12 18:11:35 -0500

I am not an HVAC engineer, so I am not familiar with using HVAC equipments in building simulation. Therefore, I rather simulate with the IdealLoads. However, I would like to calculate simple payback period of refurbishment options and, therefore, I have to convert the DistrictHeating and DistrictCooling into a monetary value.

  1. Is it right that the actual electricty consumption of the HVAC system would be similiar to the District Heating multiplied by the Coefficiet of Performance (COP) of the system?
  2. Which COP should I assume for standard unitary HVAC systems with DX cooling and reheat?

Thanks a lot.

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answered 2015-02-24 11:26:17 -0500

I expect performance of the HVAC system will vary over time based on the current weather, as well as the load on the system. There probably are some rough performance numbers you can put in, but it is probably worth learning to add some basic HVAC systems. Whatever tool you are using, there are typically some options available.

Another thing that Ideal Air Loads doesn't account for, at least as it is often used, is outdoor air which will greatly impact energy use beyond what assumptions you make for the system performance.

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Asked: 2015-02-24 03:58:25 -0500

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Last updated: Feb 24 '15