Development and Validation of Mini-Channel Evaporator Model Integrated with TXV for R134a Mobile Air-Conditioning System

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Development and Validation of Mini-Channel Evaporator Model Integrated with TXV for R134a Mobile Air-Conditioning System

Srinivasan, Rangarajan / Muthusamy, SasiKumar / Pachamuthu, Senthilkumar / Naithani, Upendra

This paper presents development and verification of an analytical model for a standalone performance study of mini-channel evaporator controlled with thermostatic expansion valve (TXV) for R134a mobile air-conditioning system. The analytical model was developed and validated using MATLAB program. In the existing literatures, studies of analytical evaporator model integrated with TXV for standalone performance was very limited. Effort has been considered to integrate TXV and evaporator model i.e. when there is a change in air flow rate, TXV adjusts refrigerant mass flow rate based on heat load and operating superheat.The developed analytical model emphasize on prediction of refrigerant mass flow rate, heat transfer and refrigerant side pressure drop characteristics. In-tube refrigerant flow was divided into two-phase region and superheated region, considering both dry and wet condition of effectiveness - NTU method.Model validation was performed by using the experimental data presented in Qi et al. (2009) and Shi et al. (2011) published journals. The maximum deviations between the predicted and actual experimental data for these studies were ±10% for heat transfer, ±15% for pressure drop, and ±8% for TXV outlet refrigerant flow rate.