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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 - Loop Design Temperature Difference = Heating Coil's Rated Outlet Water Temperature

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 =$LWT_{plant}$
• Design Loop Temperature Difference = =$\Delta T_{plant}$
• Heating Coil's coil's Rated Outlet Water Temperature = $LWT_{Heating Coil}$