Liquid Desiccant Air Conditioning Research Articles

Performance evaluation of a solar‐powered flat‐plate multichannel liquid desiccant air conditioning system

AbstractThere has been a limited application of liquid desiccant (LD) dehumidification systems in space air conditioning until now. The key elements responsible for this restricted implementation are leakage of desiccant solution, corrosion of components, and solution carryover along with the processed air to the space to be conditioned. To remove these problems, an evacuated tube solar heat collector‐driven multichannel liquid desiccant air conditioning system has been proposed and experimentally investigated. In this study, dehumidification and regeneration rate, their effectiveness, cooling effect of the dehumidifier, and indirect evaporative cooling unit have been analyzed. The results obtained indicate that the process air has been dehumidified and cooled by 6.32 g kg−1 and 5.26°C, respectively. The regeneration rate and effectiveness have been obtained to be 0.26 g s−1 and 0.31, respectively. In terms of the cooling effect, the system output of 0.703 and 0.130 kW has been obtained from the dehumidifier and indirect evaporative cooling unit of the system, respectively. The proposed system validates the possibility of the novel solar‐powered liquid desiccant air conditioning system concept and provides growth and development of the LD air conditioning technology for space air conditioning.

Mathematical model and energy efficiency analysis of a vacuum-based liquid desiccant regenerator

Liquid desiccant air conditioning (LDAC) has been considered as a promising solution for efficient air temperature and humidity control in air conditioning fields. However, the high regeneration temperature of desiccant solution impedes its spread and application. In this study, a vacuum-based liquid desiccant regenerator (VLDR) for desiccant solution regeneration in LDAC driven by low-grade energy is studied, meanwhile, the mathematical model considering the variation of heat transfer coefficient under different operating conditions is developed to analyze the system performance and energy efficiency. After the model is validated by the experimental data, the regeneration performance and energy efficiency analysis of the VLDR system is simulated and investigated. Simulation results show that hot water temperature, flowrate are the variables that affect the performance of the generator, and the performance of the condenser is influenced by cooling water temperature and flowrate. Opposite influences for vacuum pressure are found on the performances of generator and condenser, therefore the hot water temperature, vacuum pressure, and cooling water temperature should be designed properly to provide the required regeneration capacity with the pressure balance maintained. Moreover, energy efficiency is analyzed by comparing the ratio of water vapor generation rate to the total electricity consumption of the VLDR under different temperatures and vacuum pressures.

Mass transfer enhancement of falling film liquid desiccant dehumidification by micro-baffle plates

Mass transfer enhancement of falling film liquid desiccant dehumidifier (LDD) is of significance for efficiency improvement of liquid desiccant air-conditioning (LDAC). This study investigated liquid film patterns and dehumidification processes of falling film LDD for smooth and baffle plates. Five baffle plates with different baffle height and spacing were adopted in the study. The CFD simulation with VOF model was adopted for the moist air and liquid desiccant two-phase flow. Moreover, the heat and mass transfer model based on the penetration theory was developed by UDF program to predict the dehumidification process. After numerical validation with previously experimental measurement, the liquid film patterns, water vapor concentration fields, outlet water vapor mass fraction, gas-liquid flow fields and liquid film waves were obtained and analyzed. The results showed that the moisture removal enhancement ratio reaches 7.3%, 18.3%, 25.1%, 19.4% or 16.8% for the baffle plate A, B, C, D or E respectively, compared with the smooth plate case. Therefore, the dehumidification performance of the LDD can be significantly improved by the baffle plate. The liquid film waves, the flow eddies and high-value TKE distribution near the gas-liquid interface induced by the baffle plates are the main mechanisms to enhance the dehumidification performance of the falling film LDD. Moreover, the above enhancement mechanisms will be more significant for higher baffle height and smaller baffle spacing under the present conditions. The simulation results may be useful for the dehumidification performance enhancement in the realistic falling film LDD applications.

Computational analysis of spray type counter flow liquid desiccant dehumidifier

The liquid desiccant air conditioning system (LDAC) is considered as the substitute for the conventional air conditioning system mainly because of its energy-saving characteristics. The dehumidifier is one of the most important components in LDAC, therefore, it is chosen as the system for analysis. A 3D computational model of the spray type dehumidifier with counter flow configuration was created and analysed its mass transfer characteristics for two different cases. 2D CFD models studied by various researchers failed to elaborate on the actual flow process. In order to fill this gap 3D model was created and the analysis was conducted to investigate the influence of flow rate of air and desiccant on the mass transfer performance of the dehumidifier. Air and desiccant flow rate have direct influence on the mass transfer performance of the dehumidifier. In this study, the dehumidification performance is evaluated through the simulation by increasing the desiccant flow rate and simultaneously reducing the airflow rate and the results are observed. ANSYS-FLUENT® software is used for the current analysis. The increase in desiccant flow rate and decrease in air flow rate tends to improve the change in humidity ratio (specific moisture removal) from 4.2 to 6.3 g/kg of dry air. The temperature variation of solution keeps increasing as the moisture transfer increases. The rise in temperature of the solution is higher than the air during moisture transfer due to exothermic process. Similarly the equilibrium humidity ratio of solution increased due to moisture absorption during dehumidification, which indicates the decrease in solution concentration during dehumidification. The heating of solution and air during dehumidification will affect the moisture transfer rate, which can be avoided by adding a cooling unit to the liquid desiccant system.

Performance Evaluation of Heat-Drived Type Liquid Desiccant Air-Conditioning System

Performance Evaluation of Heat-Drived Type Liquid Desiccant Air-Conditioning System

On-site performance investigation of liquid-desiccant air-conditioning system applied in laboratory rodent room: A comparative study

Considerable ventilation rates in laboratory animal rooms indicate huge energy consumption of air-conditioning systems. The liquid-desiccant air-conditioning (LDAC) system is regarded as an energy-efficient system, which can help to save energy in laboratory animal rooms. However, limited studies have applied LDAC systems to this kind of rooms for energy conservation. In this study, a demonstration project is focused on, wherein both the LDAC system and conventional vapor-compression system are used in the laboratory rodent center. On-site measurements were conducted to reveal the energy performance difference between the two systems. The test results reveal that the considerable cooling loads of two rodent rooms air-conditioned by the conventional system and LDAC system are 482.1 W/m2 and 576.8 W/m2, respectively, under the summer conditions in Beijing. The LDAC system can avoid reheating and recover cooling from the exhaust air from indoors. Thus, the coefficient of performance (COPsys) of the LDAC system ranges 3.5–4.5, whereas the COPsys of the conventional system only ranges 1.8–2.3 during the test period. During the entire cooling season, an electric power saving rate of 37.3% can be achieved by the LDAC system. Moreover, although both systems can satisfy all the environment control requirements, the LDAC system is beneficial for particulate matter filtration, yet slightly unfavorable for reducing indoor ammonia concentration, compared to the conventional system.

Investigation of a compact hybrid liquid-desiccant air-conditioning system for return air dehumidification

In some automatic workshops, pharmaceutical warehouses, etc., there are control requirements for indoor air temperature and humidity, yet almost no occupants or no fresh air demand in the rooms. In this study, a hybrid liquid-desiccant air-conditioning (LDAC) system is proposed for the unoccupied rooms without fresh air demand. In the proposed system, the liquid dehumidifier and regenerator are cascaded, and the regeneration process is creatively moved to indoors. Two systems are selected as the reference systems, i.e., conventional vapor-compression system (reference system I) and conventional LDAC system using outdoor air for regeneration (reference system II). The simulation results reveal that, under the typical summer condition in Guangzhou of China, the coefficients of performance (COPsys) of the proposed system, reference system I, and reference system II are 2.6, 1.8, and 2.3, respectively, when the air is dehumidified from 13.0 to 7.7 g/kg. Compared to the reference system I, the reheating process can be avoided, and higher-temperature chilled water at 16 °C can be used in the proposed system. Compared to the reference system II, using indoor air for regeneration helps to reduce the regeneration temperature. Thus, the proposed system demonstrates energy and space advantages than the reference systems.

Design of heat pump-driven liquid desiccant air conditioning systems for residential building

In this study, two workable designs of a heat-pump-driven liquid desiccant (HPLD) air-conditioning system were proposed for residential buildings. The proposed HPLD systems were designed to work as a multi-functional air-conditioning system without additional equipment which would solve the low practicality due to the large scale and complexity of the conventional liquid-desiccant-assisted air-conditioning system. The critical difference between the two systems is the sump design for containing the desiccant solutions: Case A has a single sump instantly mixing weak and strong solutions, whereas Case B has dual sumps containing weak and strong solutions separately. The thermal load of target space was estimated using TRNSYS 18, and energy performances of both HPLD systems for summer and winter operation modes were analyzed using EES by integrating several established models and theoretical analyses. Owing to decrease in solution cooling and heating loads, the results show that Case B, compared with Case A, saved 28% of energy consumption and improved mean energy-efficiency by 37.5% for summer operation mode, and saved 12% of energy consumption and improved mean energy-efficiency by 4.95% for winter operation mode. In conclusion, Case B has a better application potential for residences in terms of energy performance.

Experimental Research on Regeneration Characteristic of ED Regeneration for Lithium Bromide Desiccant Solution with High Concentration: Operating Condition and Electrode Solution

Electrodialysis is regarded as a novel liquid regeneration method, and the regenerated solution can satisfy the dehumidification requirements even in a hot and humid environment. LiBr solution is an important choice for a liquid desiccant air conditioning system due to its great dehumidifying ability, so it is necessary to conduct experimental exploration of the regeneration characteristics of ED regeneration for LiBr solution. In this paper, the effects of solution concentration, circulation flow rate, current and electrode solution on the performance of the electrodialysis regeneration system were studied by constructing an experimental electrodialysis regeneration system. The results show that growing the starting concentration of the LiBr solution adversely affects the regeneration characteristics of the electrodialyzer and of the air conditioning system dehumidified by the solution. Under test conditions, as the initial concentration of LiBr solution increased from 45% to 55%, the performance coefficient (COP) of the system decreased from 2.12 to 1.05. When the dehumidification requirement is met, the initial concentration of the LiBr solution should be reduced. Increasing the circulating flow rate can improve the regeneration performance of the electrodialyzer and the capability of the air conditioning system dehumidified by the solution, but excessively increasing the circulating flow rate will decrease the regeneration performance of the electrodialyzer and the performance of the air conditioning system dehumidified by the solution. Increasing the current can increase the concentration of the LiBr solution in the regeneration cells in a short time, but it will reduce the regeneration performance of the electrodialyzer and the characteristic of the air conditioning system dehumidified by the solution. The current needs to be minimized when meeting regeneration requirements. With the growth in the flow rate of the electrode solution, the regeneration performance of the electrodialyser decreases continuously.

Performance characterization of a novel membrane-based liquid desiccant air conditioning system

Abstract Membrane-based liquid desiccant air conditioning (MLAC) system is one of the energy-efficient alternatives to the conventional vapor compression based air conditioning systems. However, due to inherent resistance for heat and mass transfer in the membrane and heat of absorption generated during the mass transfer, the desired room temperature and specific humidity are not achieved in the MLAC system. Present study proposes a novel MLAC system with an additional air cooling heat exchanger for the efficient control of both temperature and specific humidity of the supply air. The influences of different liquid desiccants, ambient conditions, and design and operating parameters are studied. The performance of MLAC system is presented in terms of room temperature and specific humidity, latent effectiveness of dehumidifier and regenerator, coefficient of performance and exergy efficiency. The results of the present study prove that the proposed MLAC system is capable of achieving better indoor conditions than the conventional MLAC system. The effects of the mass flow rate of desiccant and the effectiveness of the desiccant to desiccant heat exchanger on the performance of the proposed MLAC system are found to be significant.

Performance of counter flow membrane-based annular pipe liquid desiccant air conditioner

The present study comprises an experimental and numerical simulation of a counter flow membrane-based annular pipe liquid desiccant air conditioner (AP_LDAC) system. The experimental rig was constructed by using DuPont™ Tyvek® Solid as semi-permeable membrane and it has simplier structure compared to other types of membrane-based dehumidifiers. To validate the numerical data, experiments were carried out at different air side Reynolds (Re) number. The 3D numerical simulation of counter flows of the AP_LDAC system presented good agreement (R-square: 0.9659) with experimental data, as a result of the validation. Once the reliability of numerical data were verified, the mass transfer coefficient of counterflow obtained by designed system was revealed and optimized numerically by investigating for various aspect ratios, Reynolds (Re) and Schmidt (Sc) numbers. The derived Sh model was predicted over COMSOL Sh numbers with error interval from 0.1% to 10%. The effect of air inlet temperatures on temperature, concentration distributions and efficiency of the optimized AP_LDAC system were also investigated. The dehumidification efficiency was found as 99% for the maximum aspect ratio and the lowest Re number.

Experimental investigation of a novel multi-channel flat plate liquid desiccant dehumidification system

ABSTRACT The continuously growing energy demands for space air conditioning and depletion of conventional energy resources at a fast rate have propagated the need for producing a new and wide range of renewable and sustainable energy technologies. Liquid desiccant dehumidification technologies are the most optimistic approach due to their lower regeneration temperature required, a higher coefficient of performance, and the ability to be used during night hours. The factors responsible for the limited application of these systems are desiccant leakage, corrosion to the fabricating material, and carryover of desiccant droplets with the process air. To overcome these issues, a new multi-channel flat plate liquid desiccant air conditioning system has been developed and experimentally investigated. The performance of the system has been analyzed for the dehumidification and regeneration process. Calcium chloride has been used as a desiccant material with 40% and 35% by wt. concentration. Three sets of velocities of process air have been utilized, i.e., 0.9, 0.7, 0.5 m/s to investigate the system performance. Performance parameters, such as dehumidification rate, regeneration rate, dehumidification, and regeneration effectiveness, have been investigated in the present study. The liquid desiccant dehumidification system investigated in the present study includes a flat plate energy exchanger for heat and mass transfer between ambient moist air and liquid desiccant solution. This system conveys a large interfacial surface area between liquid desiccant solution and process air. Experimental results indicate that, in the dehumidification process, the ambient moist air has been dehumidified and cooled by 5.90 g kg−1 and 1.4°C, respectively, and dehumidification effectiveness of 0.239 has been achieved for the air velocity of 5 m/s at 40% concentration of the desiccant solution. Regeneration rate and effectiveness have been observed to be 0.014 g s−1 and 0.323, respectively, for the air velocity of 5 m/s at 35% concentration. The work presented in this study demonstrates the feasibility of the novel multi-layer flat plat liquid desiccant concept and provide growth and development to the liquid desiccant technologies for space air conditioning. Certain issues regarding the mass imbalance in the dehumidification and regeneration processes have been identified to be considered as future scope.

Parametric and Performance Investigations on Novel Multipurpose Liquid Desiccant Drying/Desalination System

In humid climates, due to high relative humidity present in the ambient air, traditional air drying system is becoming inefficient for drying the agricultural/food products. On the other hand, there is a scarcity of useful drinking water in many parts of the world. In order to meet the aforementioned requirements, a novel multipurpose liquid desiccant drying/desalination system has been proposed in the present study by replacing water as a working fluid instead of air in the liquid desiccant regenerator and by adding an energy efficient heat exchanger to the conventional liquid desiccant air conditioning system. A thermal model has been developed for assessing the performance of the novel system and for comparing the performance of the novel system with conventional system. Using the developed model, parametric studies on novel and conventional systems are carried out by choosing the system efficiency as a performance criterion and Lithium chloride as a liquid desiccant. From the parametric studies and performance comparison analysis, it is observed that novel system efficiency is 20.8% higher than the conventional system and the amount of pure water extracted from the novel system is observed to be 4.3 l/min as a byproduct.

Phase Change Material Melting Process in a Thermal Energy Storage System for Applications in Buildings

The development of thermal energy storage systems is a possible solution in the search for reductions in the difference between the global energy supply and demand. In this context, the ability of some materials, the so-called phase change materials (PCMs), to absorb and release large amounts of energy under specific periods and operating conditions has been verified. The applications of these materials are limited due to their low thermal conductivity, and thus, it is necessary to associate them with high-conductivity materials, such as metals, to make the control of energy absorption and release times possible. Bearing this in mind, this paper presents a numerical analysis of the melting process of a PCM into a triplex tube heat exchanger (TTHX) with finned copper tubes, which allowed for the heat transfer between a heating fluid (water) and the phase change material to power a liquid-desiccant air conditioning system. Through the analysis of the temperature fields, liquid fractions, and velocities, as well as the phase transition, it was possible to describe the material charging process; then, the results were compared with experimental data, which are available in the specialized literature, and presented mean errors of less than 10%. The total required time to completely melt the PCM was about 105.5 min with the water being injected into the TTHX at a flow rate of 8.3 L/min and a temperature of 90 °C. It was observed that the latent energy that accumulated during the melting process was 1330 kJ, while the accumulated sensitive energy was 835 kJ. The average heat flux at the internal surface of the inner tube was about 3 times higher than the average heat flux at the outer surface of the TTHX intermediate tube due to the velocity gradients that developed in the internal part of the heat exchanger, and was about 10 times more intense than those observed in the external region of the equipment.

Experimental study of a liquid desiccant regeneration system: performance analysis for high feed concentrations

Liquid desiccant air-conditioning is an energy-efficient alternative to conventional vapor compression systems due to its ability to handle sensible and latent heat loads independently. Membrane-based processes are prevalent in desalination research due to their superior abilities to separate fluids. The membrane-assisted separation process is also suitable for use in liquid desiccant air-conditioning systems as it can minimize the problems of corrosion, which has so far prevented the widespread use of liquid desiccant systems. In this study, we have utilized the flat-sheet polytetrafluoroethylene membranes for liquid–vapor separation and combined multieffect design with vacuum conditions, for enhanced liquid–vapor separation across the membrane. Preliminary experiments and literature surveys indicate that the conventional vacuum multieffect membrane distillation system exhibits poor performance when the feed concentration is above 26%. Therefore, efforts are made to enhance its performance when operating at higher concentrations (30% and 34%) by employing flat-plate-type heat exchangers to preheat the liquid desiccant and by maintaining high air-side vacuum. The regeneration process can be optimized based on increase in concentration (ΔC) and performance ratio (PR), by controlling the operating conditions. The evaluations of the regenerator performance for different operating parameters including heat source temperature, circulation cross-flow rate are presented along with analysis. Preheating the LiCl solution before regeneration resulted in improved performance; PR of 0.58 and ΔC of 2.4% are achieved for 34% LiCl concentration. Schematic representation of the membrane-assisted LDAC test bed

Experimental investigation on the performance of packed tower for regeneration of liquid desiccant

In a liquid desiccant air conditioning system the regenerator is one of the essential components. The effectiveness of the regenerator directly influences the system performance. An experimental investigation on the performance of packed tower for regeneration of liquid desiccant is carried out. The experimental test unit has been designed and installed in the combustion Lab., Faculty of Engineering, Mansoura University, Egypt. A solution of calcium chloride is used as a working desiccant with a packing of burned clay pieces with a random shape, its porosity is about 0.22 and the average size and weight of the piece are about (90.25 cm3, 88.4 gram) respectively. The input variables used in the experiment are air inlet temperature, air flow rate and solution flow rate. The outlet parameters which are measured or calculated from the experimental results are air outlet temperature, air humidity ratio, desiccant solution outlet temperature and concentration. To illustrate the effect of air and liquid desiccant parameters on the outlet variables the experimental results are plotted. Based on these results, higher air inlet temperature (Tai = 60, 80, 100 and 120 °C) where the air inlet humidity ratio (0.0127, 0.0123, 0.0114 and 0.0130 kg/kgda) results in higher average air humidity ratio (0.0206, 0.0232, 0.0249 and 0.0334 kg/kgda) and the %age change of desiccant solution concentration (0.63, 1.13, 1.95 and 2.25 %) respectively. And higher air flow rate (Ma = 0.0252, 0.0529, 0.0659 and 0.0683 m3/s) where the air inlet humidity ratio (0.0147, 0.0177, 0.0178 and 0.0184 kg/kgda) results in higher average air humidity ratio (0.0245, 0.0293, 0.0302 and 0.0312 kg/kgda) and the %age change of desiccant solution concentration (0.78, 2.21, 2.57 and 3.01 %) respectively. Increase in solution flow rate (Ms = 1, 2 and 3 LPM) where the air inlet humidity ratio (0.0175, 0.0151 and 0.0148 kg/kgda) results in lower average air humidity ratio (0.0278, 0.0274 and 0.0267 kg/kgda) and the %age change of desiccant solution concentration (2.86, 2.58 and 2.23 %) respectively.

Comparative Analysis of Energy Consumption, Indoor Thermal–Hygrometric Conditions, and Air Quality for HVAC, LDAC, and RDAC Systems Used in Operating Rooms

As controlling temperature and humidity is crucial for maintaining comfort and preventing microbial growth, operating rooms (ORs) are the most energy-intensive areas in hospitals. We aimed to evaluate the energy consumption of three dehumidification air conditioning systems used in ORs and their corresponding air quality for ORs at rest. This study selected three ORs using a conventional heating, ventilation, and air conditioning (HVAC) system; a liquid desiccant air conditioning (LDAC) system; and a rotary desiccant air conditioning (RDAC) system, respectively. The indoor thermal–hygrometric conditions, air quality, and energy consumption of the ORs were monitored in this study. The median levels of relative humidity (RH) were 66.7% in the OR using the conventional HVAC system, 60.8% in the OR using the LDAC system, and 60.5% in the OR using the RDAC system. The median daily total energy consumption of the RDAC system (10.1 kWh/m2) and LDAC system (11.8 kWh/m2) were 28.12% and 16.54% lower, respectively, than that of the conventional HVAC system (14.1 kWh/m2). The PM≥0.5 levels and airborne bacterial concentrations in the ORs met the ISO 14644-1 Class 7 standard and China’s GB50333-2013 standard, respectively. The RDAC system was clearly superior to the LDAC and conventional HVAC systems in terms of energy consumption.

Analytical solutions for the optimal cooling and heating source temperatures in liquid desiccant air-conditioning system based on exergy analysis

In liquid desiccant air-conditioning (LDAC) systems, the same moisture removal amount can be realized by different temperature combinations of cooling and heating sources. However, only limited studies have addressed optimal cooling and heating source temperatures for LDAC systems. In this study, analytical solutions for the optimal cooling and heating source temperatures in LDAC systems are determined under ideal conditions. Under the optimal temperatures, the minimum exergy inputs of the cooling and heating sources are achieved. The accuracy of the analytical solutions is validated based on results obtained from an enumeration method. Two critical conclusions are drawn: (i) for any solution flow rate, there is a set of optimal cooling and heating source temperatures and a minimum exergy input, whereas among different solution flow rates, there is an optimal solution flow rate leading to the minimum exergy input (calculated in this study); and (ii) once the product of the solution mass flow rate and solution specific heat capacity is fixed, the optimal cooling and heating temperatures, states of air and solutions can be uniquely determined, free from the influence of the desiccant solution type. Thus, this study provides a fundamental reference for achieving the best exergy performance in LDAC systems.

Experimental analysis of a new generation of membrane liquid desiccant air-conditioning (LDAC) system with free convection of desiccant for energy economic management

Abstract A new generation of membrane liquid desiccant air-conditioning (LDAC) system with free convection of desiccant is investigated experimentally. The free convection LDAC systems have benefits over conventional air conditioning (AC) systems with the added advantage of system operation with no circulating pump. The prototype system made up of mainly two externally cooled hollow fiber membrane (HFM) liquid-to-air energy exchangers worked as dehumidifiers and regenerators. The performance of the system studied under the standard summer air conditions, and a thorough study was done to reveal its behavior as an AC system in different airflow rates. The coefficient of performance (COP) of the system is 0.85 at the base condition, and the sensible heat factor (SHF) of the dehumidifier ranged between 0.24 and 0.4 for different operating conditions. The heat and moisture removal rate and sensible heat factor increased while the electrical and thermal coefficients of performance (ECOP and TCOP) decreased by the airflow rate increase. While the value of TCOP is approximately the same for all operating conditions, the ECOP is very sensitive to airflow rate, and its value reduced by 82% as the value of airflow rate tripled. It is inferred that unlike the forced energy transfer loops, it is mainly the solution side transfer coefficients that determine the system performance, and between the heat and moisture transfer coefficients, the latter is more effective on system performance.

Performance and optimization of a novel solar-driven liquid desiccant air conditioning system suitable for extremely hot and humid climates

Extremely hot and humid climate has typical characteristics, such as high temperature, high humidity and lack conventional energy. It highly relies on the use of refrigeration and dehumidification equipment, which results in a large amount of conventional energy consumption. However, this contradicts the local energy system. Therefore, a novel solar-driven liquid desiccant air conditioning system is described and investigated in this study. It combines photovoltaic and thermal solar power, dehumidification, and active cooling. A mathematical model is first developed for each of components in the study: liquid-desiccant dehumidification/regeneration, photovoltaic system, solar collector, chiller, and auxiliary equipment. This study then analyzes, via numerical simulation, the entire system: the total cooling-capacity, the wasted condensation heat, and the regeneration-heat reduction-rate. Finally, the study investigates the system performance and optimize the ratio of photovoltaic/collector area, considering the building-area constrains typically associated with extreme heat and humidity. Using the proposed system, for every 2% increase in indoor air relative humidity, the regeneration temperature and regeneration heat quantity decrease by 2.8 °C and 62.08 kW respectively. For every 10 °C increase in condensation temperature, the wasted condensation waste heat quantity increases by 173.7 kW. Furthermore, when the heat humidity ratio and cold load index are constant, together with the decrease in installed roof-area, the ratio of photovoltaic/collector area required by the system decreases gradually.