| dear all, I'm modelling a low temperature radiant system in witch hot water must be supplied by an air to water heat pump water heater, and a boiler. in my water loop, i put the heat pump, the boiler, and a bypass in parallel after the circulation pump's branch. the problem is : how can i schedule the boiler to work just when the outdoor drybulb temperature is below 5°C, and the heat pump when it's above 5°C. sadely, the possibility to specify a boiler availability based on outdoor temperature (PlantEquipmentOperation:OutdoorDryBulb), is supported only by condenser loops, and not by a plant loop. Thanks in advance. |