【文章內(nèi)容簡介】 ng the office working time, . 9:00 . to 5:00 . the average COP and the average solar fraction of the system were and when the operating conditions are: generator temperature is 85176。C and evaporator temperature is 8176。C and condenser temperature varying with ambient temperature. This system can save up to 80% of electrical energy when pared with traditional pressor based air conditioning. Ha Q P and Vakiloroaya V (2020) studied the performance enhancement and energy efficiency improvement of a new hybrid solar assisted air conditioning system. A single stage vapour pression solar air conditioner consists of six major ponents。 a pressor, a condenser, an expansion device, an evaporator, a solar vacuum collector and a solar storage tank. In this new configuration a bypass line is implemented in the discharge line after the pressor to control the refrigerant mass flow rate via a two way valve while a variable speed drive is connected to the air cooled condenser to adjust the condenser fan air flow rate. From the simulation, they found that the enthalpy of refrigerant entering the expansion valve with and without the new configuration is reduced by %. Designed at steady state conditions, the pressor power consumption for the system without control and the developed system are and and energy savings is 14%. The average power consumption by using the developed system is % less than that of the uncontrolled system. The average energy saving potential for the proposed approach for the pressor and condenser fan is % and %. Both of pressor and condenser reduction can result ultimately in an increase of COP. The average supply temperature of the developed system is decreased from 176。C to 176。C. The average energy consumption of the newly developed system under control and the original one in summer month power consumption is less than the power usage of the uncontrolled plant. For the closed loop system under control have 7% to 14% electricity consumed by the pressor can be saved using the proposed system under multivariable control as pared to the system without control. They concluded that this new design is promising for improving the system performance while fulfilling the cooling demands as well as achieving high energy efficiency. Ibrahim I El Sharkawy et al (2020) theoretically investigation on the performance of solar powered silica gel/water based adsorption cooling system working under Middle East region climate conditions. Two bed silica gel/water type adsorption chiller has been used. They found that the maximum cyclic average cooling capacity of the system working under Cairo and Jeddah climate conditions reaches to kW and kW under Aswan climate conditions. Cooling capacity of the system without hot water buffer storage reaches its maximum at noon and for the system with hot water buffer storage, the maximum cooling capacity value is 13 kW that is achieved at a time interval of 14:00 and 15:00 hours. The system with hot water buffer storage has less fluctuating cooling energy production pared to that of the system without hot water buffer storage. Lucas M et al (2020) installed a Hydrosolar roof prototype on a laboratory roof at Spain. This building was air conditioned with a water condensed chiller working with the solar roof as a condenser. The total volume occupied by the four cells of the prototype is roughly 6m*6m* in size. During the summer 2000 the system was monitored to obtain performance data in a real installation and under real conditions. They created CFD model and analysed. From their numerical results and experimental results, they confirmed that, the air mass flow is induced through the channel due to natural and forced convection. Natural convection is produced by the solar radiation heating the plates and forced convection is due to the wind suction effect at the output of the channel. Therefore, the two main meteorological factors that influence the system performance are solar radiation and wind velocity. Ma Q et al (2020) studied performance of hybrid air conditioning systems and they observed that, the performance of hybride air conditioning system is % higher than conventional vapour pression refrigeration system at a latent load of 30% and the improvement can be achieved by % at a latent load of 42%. Min Tu et al (2020) performed parison between two novel configurations of liquid desiccant air conditioning system driven by low grade thermal energies. Moncef Balghouthi et al (2020) studied with the TRNSYS program simulation study of solar powered absorption cooling technology under Tunisian conditions. A number of simulations were carried out in order to optimize the various factors affecting the performance of the system. Their simulation results show that absorption solar air conditions solar air conditioning systems are suitable for Tunisian’s conditions. Sukamongkol Y et al (2020) they conducted an experimental test to investigate validity of a developed simulation model in predicting the dynamic performance of a condenser heat recovery with a hybrid PV/T air heating collector. The thermal energy generated by the system can produce warm dry air as high as 53176。C and 23% relative humidity. 6% of daily electricity can be obtained from the PV/T collector in the system. The use of a hybrid PV/T air heater, incorporated with the heat recovered from the condenser to regenerate the desiccant for dehumidification and save the energy use of the air conditioning system by 18%. They concluded that, the experimental validation results that the developed simulation model is able to predict within acceptable limits of accuracy the performance of a condenser heat recovery with a hybrid PV/T air heater to regenerate desiccant for reducing energy use of an air conditioning room. Thosapon Katejanekam and Kumar S (2020) simulation procedure is used to predict the operating and performance parameters of the system in the form of daily profiles. They found that, the system is redu