Final Year Project (Week 6)

Week 6

The implementation of ASHP and radiator system

The model of heating system includes heat pump and radiator two subsystems. For the AHSP, the heat requirement comes from the IDEAS model and will be provided by heat pump within its limitation. In other words, the operation of ASHP should not exceed the max value of heat output. The supplementary heater will works if the MAX(ASHP) has reached.
Based on this, the calculation of Qmax and COP is significant for the ASHP block, its equations have been found via previous paper as shown below:

The typical COP regression model and Qdot(factor) regression model relationship is expresses as plots and are shown below for reference. It can be seen the COP and Qdot(factor) are relates with the temperature of external and return.

Hence the Qref comes from a published data base, which is obtained from a testing of 30 heat pump units with each of 8 test points, the data could be checked as the table shown below :

 Besides, there existing another valuable parameter for the calculation of Max ASHP output, which named return temperature (Treturn). Treturn comes from the radiator system and derivation is explained below, which is based on the actual operation principle of radiator.

                                                                                                                                                                 
The "hrad" represents the heat transfer coefficient and hence we will dealing the Qdot(Required) equals to the Qdot(HS). Based on this relation, equations and typical parameter's value, the ASHP as well as the radiator system could be implemented on the MATLAB via Simulink. The implementation work will be completed by next week.