Abstract
In this paper, an experimental study of the thermal performance for hybrid solar air conditioning system was carried out, to investigate system suitability for the hot climate in Iraq. The system consists of vapor compression unit combined with evacuated tube solar collector and liquid storage tank. A three-way valve was installed after the compressor to control the direction flow of the refrigerant, either to the storage tank or directly to the condenser. The performance parameters were collected by data logger to display and record in the computer by using LabVIEW software. The results show that the average coefficient of performance of hybrid solar air conditioning system (R=1) was about 2.42 to 2.77 and the average power consumption was about 1.1 to 1.12 kW when the ambient temperature was about 34.2 to 39.7 ˚C, while the average coefficient of performance of conventional system (R=0) was about 3.23 and the average power consumption was about 1 kW when the ambient temperature was about 30.8 to 34.3 ˚C. It can be concluded that the use of the hybrid solar system in Iraq with its current form could not be saved electricity.
Highlights
A considerable increase in the global electricity demand and depletion of fossil fuel resources have increased the need for the development of eco-friendly and energy-efficient technologies, Desideri, et al, 2009
Ha and Vakiloroaya, 2012, enhanced the performance of direct expansion air conditioner when combined with a vacuum solar collector that is installed after the compressor
Many experimental tests were carried out on the system to study its thermal performance and compare it with the conventional system, just three tests are discussed in this paper as samples to other tests, and each test is studied within four characteristic parameters as following: 6.1 Refrigerant Temperature
Summary
A considerable increase in the global electricity demand and depletion of fossil fuel resources have increased the need for the development of eco-friendly and energy-efficient technologies, Desideri, et al, 2009. Abd, et al, 2013, studied experimentally the thermal performance of hybrid solar assisted air conditioning system with and without water in the storage tank They noticed that the refrigerant temperature and pressure leaving the solar collector were decreased, and the average thermal efficiency was fairly acceptable. Vakiloroaya, et al, 2013, developed a hybrid solar air conditioning system by proposing a new 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 was 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 .Abid and Jassim, 2015, investigated an experimental study of the thermal performance of air conditioning system combined with a solar collector. The objective of present work is to study the performance of the hybrid solar air conditioner system with the aid of bypass line with the threeway actuator valve to overcome insufficient solar radiation in a day in Iraq (hot zone)
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