Low temperature radiant floor with heating and cooling only have cooling rate during a year
I made a system with low temperature radiant floor and Heat exchanger desiccant system. Heat exchanger desiccant operated with a DX cooling coil for dehumidify and cooling，this is the HVAC air system, and radiant system，this is the plant loop，served as a secondary cooling device at summer and primary heating system at winter. Thermostats were set as 20 and 26 degree at summer and winter, respectively. The heating/cooling control temperature schedules were also set as 20 and 26 degree at summer and winter, respectively. Air Terminal :Single duct :uncontrolled worked as HVAC air system's，desiccant+ DX cooling coil，terminal machine and combined with low temperature radiant system in the Zone HVAC :Equipment list. I compared with example files when established this system. I guess my system is same as the example file, so I cannot understand why my radiant system don't have the heating rate. I've been struggling with this problem for one month, so I need your help. I have no other ideas to solve this problem. Thanks for your attention and looking forward your help. Welcome everybody to comment.
We need a lot more information on your model to be able to assist.
Please include the low temperature radiant loop inputs, a graph of the zone mean air temperatures, and a link to a copy of your model.