Type 0927

mass flow through switched off heat pump
in reality
 * circulation pump is on constantly to provide heat to the heating system above an outdoor set point temperature for example 17°C (62.6 °F)

problem
 * circulation pump is on above a certain outdoor temperature convergence errors occur

solution (Type 0927) temperature in the returning fluid from the tank to the heatpump ( as it is done in many cases in real-life)
 * add some volume to buffer tank
 * example of heat pump
 * pump is constantly running between the storagetank and the heatpump
 * heat pump is controlled by the
 * heat demand is simulated in another program and imported by type 9a.

explanation of convergence error / pipe system that is not capable of "consumeing" the energy produced i one time step buffer tank with a capacity of 200 liters + 20 meters of pipeing should work with timestep of 0.5 h
 * large timesteps compared to the inertia of system
 * Large time steps (>15 minutes) often cause unrealistic results and very often lead to non-convergence issues
 * e.g. often a buffertank
 * Heat pump with rated performance at 8 kW ( B0/W35 ) and a
 * heat pump simulations should be executet with time step of 1 till 5 min