How do i set my heat recovery correct?

asked 2020-04-16 07:33:18 -0500

Jonas gravatar image

updated 2020-04-16 17:44:04 -0500


In my building, I have a heat recovery system for the ventilation that recovers 75% of the temperature difference between supply air en exhaust air. When the outside temperature is for example 10 degrees and de inside temperature is 20 degrees, de supply air has to be 17.5 degrees. Now i have an airloop with a setpoint manager: follow outdoor temperature and a heat exchanger air to air with effectiveness 75%. Now the supply air is only 15 degrees in my example

Can anybody help me? Thanks

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Are the HX entering temperatures still 10C and 20C?

rraustad gravatar image rraustad  ( 2020-04-16 08:39:00 -0500 )edit

The temperatures before and after my heat exchanger are the same. so it isnt working i think? The air passes also the economizer and then the temperature of the supply air is different to the inlet temperature of the heat exchanger. Only my economizer is working then?

Jonas gravatar image Jonas  ( 2020-04-16 09:00:09 -0500 )edit

The HX can be bypassed when economizer is active. Look in the rdd file to find the air loop economizer operation report variable and plot that along with air flow and temperatures through the HX.

rraustad gravatar image rraustad  ( 2020-04-24 12:58:03 -0500 )edit