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Design Loop Exit Temperature should be set to 40°C in your case.
For the Loop Design Temperature Difference, it should be set in concordance with your coils so that:
Design Loop Exit Temperature=$LWT_{plant}$Design Loop Temperature Difference=$\Delta T_{plant}$- Heating coil's
Rated Outlet Water Temperature= $LWT_{Heating Coil}$
$$LWT_{plant} - \Delta T_{plant} = LWT_{Heating Coil}$$
If your boiler and coils are designed for 40°C supply and 30°C return temperature for example, you would use Heating Coil's Rated Outlet Water Temperature = 30°C and Loop Design Temperature Difference = 10°C.
See Heating Coil Water: Rated Outlet Water Temperature
All in all, you're - maybe unfortunately - responsible for ensuring consistency between your plant and the coils' sizing objects.
Likewise, the temperatures you put for the heating coil air inlet and outlet temperature should match the Sizing:System object of the airloop on which it's located
Design Loop Exit Temperature should be set to 40°C in your case.
For the Loop Design Temperature Difference, it should be set in concordance with your coils so that:that
Design Loop Exit Temperature Loop Design Loop Temperature Difference $$LWT_{plant} - \Delta T_{plant} = LWT_{Heating Coil}$$
If your boiler and coils are designed for 40°C supply and 30°C return temperature for example, you would use Heating Coil's Rated Outlet Water Temperature = 30°C and Loop Design Temperature Difference = 10°C.
See Heating Coil Water: Rated Outlet Water Temperature
All in all, you're - maybe unfortunately - responsible for ensuring consistency between your plant and the coils' sizing objects.
Likewise, the temperatures you put for the heating coil air inlet and outlet temperature should match the Sizing:System object of the airloop on which it's located