Abstract
Enhancement of the performance for hybrid solar air conditioning system was presented in this paper. The refrigerant temperature leaving the condenser was controlled using three-way valve, this valve was installed after the compressor to regulate refrigerant flow rate towards the solar system. A control system using data logger, sensors and computer was proposed to set the opening valve ratio. The function of control program using LabVIEW software is to obtain a minimum refrigerant temperature from the condenser outlet to enhance the overall COP of the unit by increasing the degree of subcooled refrigerant. A variable load electrical heater with coiled pipe was used instead of the solar collector and the storage tank to simulate the solar radiation. Experimental data was measured to study the performance of the system. The proposed system was compared with the conventional one. Results show that the COP of the proposed system was higher than the COP of the conventional system by 10 %. In addition, the controlled system saved an electricity of 11.2 %. The optimum opening valve ratio fluctuated between 0.3 and 0.4 when the heater power was 500 W.
Highlights
In summer, air conditioning represents a high cost in global building services in both commercial and residential buildings
Ha and Vakiloroaya, 2012 [3] estimated the optimum refrigerant temperature entering the condenser in hybrid solar air conditioner system by proposing a by-pass line together with a three-way proportional control valve that installed after the compressor to control the refrigerant flow rate and enhance the performance of the system, results show that the average coefficient of performance (COP) by using the optimal set-point values is higher than the commonly-used design by 6.7%
The aim of this study is to investigate the enhancement of hybrid solar A/C system by utilizing a new strategy of control variable via three-way actuator valve
Summary
Air conditioning represents a high cost in global building services in both commercial and residential buildings. Vakiloroaya et al, 2013 [4] developed the hybrid solar air conditioning system by proposing a discharge bypass line together with an inline solenoid valve to increase the subcooling of the refrigerant at partial loads, the solenoid valve installed after the compressor to regulate the mass flow rate of the refrigerant. This development is promising between 25 and 43% of monthly electricity can be saved on average. The models are derived based on the mass and energy
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