An analytical model of evaporator performance under frosting conditions for lumped-parameter simulations of heat pumps

Enhancing the energy efficiency of HVAC systems is crucial for meeting the nZEB standards. This involves developing analytical models for simulating building-system dynamics over time with low computational resources. However, existing models struggle with accuracy in heating mode due to evaporator frosting, a factor not usually accounted for commercial software. To address this, a new heat exchanger block that accurately models frosting and its impact on system performance is developed using the Simscape™ language in Simulink ® environment. This innovative block enhances the predictive capability of heat-pump simulations that use a lumped-parameter approach, ensuring compatibility and easy integration with existing toolboxes. The improved model overcomes conventional limitations, offering reliable simulations in heating mode and providing insights into energy transport and efficiency. Incorporating accurate frosting representation aids in developing more effective defrost strategies, minimizing energy losses and improving compliance with energy efficiency standards.