Thermal Coefficient Of Performance Research Articles

Performance analysis of no-insulation long distance thermal transportation system based on single-stage absorption-resorption cycle

High source temperature demand (>100 °C) and inflexible working pressure restrict the widespread application of solution transportation systems. Absorption-resorption heat pump cycles stand out in significantly lowering the demand of heat source temperature (to 80 °C), as well as multiplying working pressure choices (lower to 500 kPa) attributed by solution concentration adjustment and simplifying system structure (no rectifier). In this paper, a novel solution transportation resorption system is proposed based on the single-stage absorption-resorption heat pump cycle by assigning high-pressure generator and high-pressure absorber on the source site while placing low-pressure generator and low-pressure absorber on the user site. Feasible working pressure combinations and outlet temperature of high pressure-absorber to effect the system are investigated, illustrating the pressure range difference between resorption cycle and cycle -based heat transportation system. Thermodynamic parameters such as thermal coefficient of performance, electrical coefficient of performance, heat supply temperature range of the system are revealed in this paper. Under the condition that transporting distance is 20 km, the maximum COP value of the proposed system could reach 0.53 when high/low pressure pair is 700 kPa/405 kPa. The highest supply water temperature could reach 53.84 °C with COP of 0.477, which is suitable for floor heating. Besides, hydrodynamic and economic analysis of the proposed system are conducted, indicating that when the transportation distance exceeds 4 km, the proposed system is more economical than conventional sensible heat transportation systems. According to restriction to pump power, the longest distance is supposed to be no more than 113 km when loading power is 20 MW.

Performance assessment of a desiccant air-conditioning system combined with dew-point indirect evaporative cooler and PV/T

In this study, a new solid desiccant air-conditioning system configuration integrated with direct and dew-point indirect evaporative coolers and water-cooled photovoltaic-thermal solar collectors (PV/T) is proposed and simulated for a building located in Adana, a humid and hot city on Mediterranean coast of Turkey. New multiple linear regression equations are developed for the performance of desiccant wheel and dew-point indirect evaporative cooler, which are the two crucial components of the air-conditioning system and used in hourly simulations. Building set temperature, exhaust air mixing ratio, suitable warm air source for preheating regeneration air and optimum connection strategy of PV/T collectors to each other are examined in detail. Hourly and daily thermal coefficient of performance (COPth), solar fraction, primary energy consumption and specific primary energy consumption are calculated to evaluate the energetic performance of the system. COPth of the system ranges from 0.28 to 0.40 during the day, with a daily COPth of 0.34. 69% of the thermal energy required to regenerate desiccant wheel can be generated by the PV/T water collectors.

Numerical study on enhanced melting heat transfer of PCM by the combined fractal fins

The melting heat transfer characteristics of PCM were studied in different combined types of heat exchangers. The effect of combining two different bifurcation level fractal fins was considered for PCM melting heat transfer in a phase change heat exchanger. Based on fractal theory and enthalpy-porosity method, a PCM melting model of two-dimensional unsteady heat transfer was established in a combined fractal fin heat exchanger. The influences of some factors, such as combined types of fractal fins, bifurcation level, heat transfer area of the fins and the spacing of the fins, were discussed for the melting heat transfer process. The results show that the complete melting time of PCM in a combined fractal fin heat exchanger is reduced by 68% compared with the traditional fractal fin heat exchanger. The melting time shows decreasing first and then gradually stabilizing as the bifurcation level number and heat transfer area of the combined fractal fins increase. The melting rate of PCM is the fastest in the Case 4 heat exchanger, and the complete melting time of PCM is the shortest in the Case 3 heat exchanger. Fin spacing and heat transfer area have a significant impact on the complete melting time. On this basis, the thermal performance coefficients between the fins zone and PCM zone are defined. The complete melting time of PCM is found to be exponentially negatively correlated with the thermal performance coefficient by curve fitting. The temperature distribution uniformity coefficient is proposed to evaluate the temperature distribution uniformity during the melting process of PCM. It is found that the temperature distribution uniformity of Case 2 has the best at the end of melting. The above results provide a theoretical basis for structural design of the heat exchanger with combined fractal fins to enhance PCM melting heat transfer.

Optimization of the thermal storage system in a solar-driven refrigeration system equipped with an adjustable jet-ejector

The present paper shows a numerical research about the influence of different thermal storage capacities and thermal power consumption strategies in a solar-driven air-conditioning system operating with refrigerant R1234yf. The computational model is fed with hourly climatic data (solar irradiance and ambient temperature) of the typical meteorological year of a Mediterranean location. A special focus is put on the dynamic response of the refrigeration system, the solar collector, and the sensible heat storage tank. Since the refrigeration needs are nearly synchronized with the sunny hours, small tank volumes are the most convenient architecture to achieve a rapid heating-up after tank discharges. For a parabolic trough collector span of 7.1 m, 13.3 kW of thermal power consumption represents a reasonable trade-off between the main performance indicators, mainly, the refrigeration capacity, COPth (thermal coefficient of performance) and the system's capability to operate properly ensuring an adequate thermal level in the heat reservoir.

Experimental study on the performance of an improved dehumidification system integrated with precooling and recirculated regenerative rotary desiccant wheel

High temperature and humidity conditions in enclosed cabins pose a threat to the safety of staff and equipment, and will result in intensive energy consumption by conventional air conditioning dehumidification systems. Therefore, an improved dehumidification system integrated with precooling and recirculated regenerative rotary desiccant wheel was proposed. The effects of the process air parameters (temperature and humidity), precooling temperature and regeneration air parameters (temperature and flow ratio) were experimentally investigated. Key performance indicators were analyzed, including the moisture removal capacity (MRC), thermal coefficient of performance (COPth), sensible energy ratio (Es) and dehumidification coefficient of performance (DCOP). The MRCtot was found to be improved by 29.7% at most compared with that of a conventional chilled water cooling system. In particular, the optimal MRC was obtained by an appropriate ratio between the regeneration and process airflows. The optimal ratio was determined between 8% and 20%. The DCOP and Es of the rotary desiccant wheel decreased with increasing regeneration airflow ratio. Moreover, COPth ranged from 0.33 to 1.17, and was improved with increasing process air temperature/humidity and decreasing precooling temperature. Overall, the feasibility of the system was verified and dehumidification characteristics under various working conditions were demonstrated to prompt its application.

A Mathematical Model for Predicting the Performance of the Solar Energy assisted Hybrid Air Conditioning System (SEAHACS) with One-Rotor Six-Stage Rotary Desiccant Cooling System. (Dept. M)

A mathematical model for predicting the performance of solar energy assisted hybrid air conditioning system (SEAHACS) is presented. The honeycombed silica gel desiccant wheel was used in this study, one-rotor six-stage rotary desiccant cooling system, in which two-stage dehumidification process, two –stage pre-cooling process and two-stage regeneration process are realized by only one wheel. Three air streams are involved in the present system. The mathematical model has been validated with the experimental data. As the key operating and design parameters, the range of regeneration air inlet temperature from 65-140 oC, area ratio of process air to generation air change from 1-3.57, regeneration air inlet velocity from 1.5-5.5 m/s have been examined for a range of rotation speed from 6-20 rev/h. the optimization of this parameters is conducted based on the moisture removal capacity D, relative moisture removal capacity, dehumidification coefficient of performance and thermal coefficient of performance. At last, the influences of these main parameters on optimal rotation speed are discussed

Efficient absorption cooling for low district heating return temperatures

In the past years scientists of Technische Universität Berlin, developed a new generation of single stage H2O/LiBr absorption chillers in the range of 50 to 500 kW nominal cooling capacity. In 16 installations 25 absorption chillers have been monitored within a broad field test (FeldtestAbsorptionskälte für Kraft-Wärme-Kälte-Kopplung-Systeme, FAkS, funded by BMWi as project FKZ 03ET1171a-d) in the years 2013 to 2018. Annual performance figures of thermal coefficient of performance (COPth) in the range of 0.7 kWh 0/kWh 2 and electrical coefficient of performance (COPel) superior to 20 kWh 0/kWh el have been proven, serving district heat (DH) return line temperatures in the range of 62 °C to 68 °C.While the FAkS project focused on installation and operation of absorption chillers themselves, the follow-up project called ReKs (Regelungenergie-aufwandsoptimierterKälteerzeugungssysteme, FKZ 03ET1583), concentrates on overall system control and efficiency. Controlling absorption chiller cooling supply at low district heat return line temperatures is extended to an energy efficient control of all participating components including hot water, chilled water, heat sink pump and cooling tower fans. Models and strategies have been developed on thermal science theory and implemented in industrial control software. Proof of concept has been evaluated by monitoring field test installations while in parallel particular field test related parameters have been varied. Without diminishing quality of chilled water temperature and/or cooling capacity, electrical energy efficiency can at least be doubled, compared to the figures of FAkS installations. Moreover, new strategies enable efficient absorption cooling with DH return line temperatures in the range of 50 °C during moderate weather conditions periods. Field test results from 2020 and 2021 are presented here.

Investigation of a Storage Type Solar-Driven Solid Desiccant Cooling System

Solar-driven solid desiccant assisted evaporative cooling could be an effective alternative to conventional vapour compression cooling systems due to its lower operating costs and lower environmental impact. This technology has been widely investigated for continuous operation through the use of desiccant wheels. However, the investigation of such technology for storing solar radiation in the form of coolth energy is missing in the literature. In that regard, primary objective of the present study is to investigate a fixed bed solar driven desiccant assisted evaporative cooling system, that uses vermiculite-calcium chloride composite sorbent, to be utilized as a coolth storage in hot-humid climate. To achieve this aim, a prototype unit was designed, developed and tested under real climatic conditions of North Cyprus. According to the results, over six hours of charging period, at regeneration temperature between 51 – 62 °C and air mass flow rate of 0.03 kg/s, average moisture desorption rate of 3.9 g/min was obtained. On the other hand, over four hours of discharging at air inlet temperature of 32 – 35 °C and mass flow rate of 0.06 kg/s, vermiculite-calcium chloride / wood chips couple provided average air temperature drop and cooling capacity of of 8.4 °C and 0.49 kW respectively. Hygrothermal efficiency of the system is also found 0.65. Additionally, the average wet-bulb effectiveness and average dew-point effectiveness were obtained as 121.6%, and 90.2% respectively. Furthermore average total and thermal coefficient of performance of 0.35 and 0.6 were achieved over the three consecutive cycles. These results suggest that the proposed system could be a potential technology for storing solar energy to be used in air conditioning applications in buildings.

Fluid flow and convective heat transfer in a rotating rectangular microchannel with various aspect ratios

The features of flow fluid and convective heat transfer have been investigated numerically in a rotating rectangular U-shaped microchannel for various aspect ratios (AR). Pure water is used as working fluid and 3D steady simulations are performed for Reynolds number of 400. The effects of aspect ratio (AR = 0.25–4), slip/no-slip conditions, rotational speeds in the range of 0–300 rad/s on the velocity profiles/contours, heat transfer, pressure drop, Nusselt number, and thermal performance coefficient are studied. The results show that an increase in AR (for AR>1) or a decrease in AR (for AR<1) provided an increase in pressure drop and heat transfer. Besides, contrary to hydrophilic microchannel, the heat transfer and pressure drop decrease in microchannel with the hydrophobic surfaces for all ARs considered. In addition, the thermal performance coefficient (E) is used as a balance between heat transfer augmentation and the power consumed. It is found that the E is higher for microchannel with hydrophobic surface than that of with hydrophilic one for all ARs examined. Moreover, the rotating microchannel is more efficient in respect to heat transfer enhancement than that of the stationary case, especially at AR = 1. Moreover, the results for two thermal boundary conditions of constant heat transfer and constant wall temperature conditions are compared at AR = 1 and it is found that the total Nusselt number is higher for constant wall temperature case than that of constant heat flux case in rotating microchannel while it is contrary in stationary one.

Investigation of a high-efficient hybrid adsorption refrigeration system using desiccant coated heat exchangers

To extract as much energy as possible from a low-grade heat source in the range of 50–95 °C, a hybrid adsorption refrigeration system using desiccant coated heat exchangers is proposed and investigated in this study. This hybrid system can be operated in three working modes to satisfy various demands for cooling capacity output forms and system performance. Models of the adsorption refrigeration system and desiccant coated heat exchangers are integrated to match the two separate systems and evaluate the system performance. The results indicate that 24 °C is the optimal chilled water temperature to establish circulation between the two systems. Mode 1 exhibits the best cooling capacity output, which is 24% and 32% higher than that of Mode 2 and Mode 3, respectively. Mode 2 ranks first in exergetic efficiency with a heat source of 50 °C and reaches a maximum thermal coefficient of performance (COPth) of 11.09% and 0.998, respectively. Mode 3 provides the highest exergetic efficiency at a heat source of 55–95 °C and a cold-water supply. Finally, the performance of the hybrid system is compared with that of a traditional adsorption system to verify the improved efficiency and wider operable heat source range of the proposed system. The hybrid system can operate effectively with a heat source range of 50–95 °C, while the traditional system cannot work below 65 °C. The COPth of Mode 2 is superior to that of the traditional system, and the heat source of 50–65 °C results in a better COPth of Mode 1, while the traditional mode shows higher COPth than that of Mode 3 at a heat source of 65–95 °C. The three modes outperform than the traditional mode in terms of exergetic efficiency. The proposed hybrid system can thus effectively exploit a low-grade heat source with high efficiency, providing a promising solution for efficient energy utilization.

Thermal Performance Investigation in Circular Tube with Stationary and Rotating Conical-Obstacle Inserts

In the present study, the effect of conical obstacles on heat transfer and flow characteristics in a circular tube was investigated. In most previous studies, stationary obstacles were used to stimulate the flow and to investigate heat transfer and pressure drop. In the present paper, in addition to investigating the effect of a stationary obstacle, the effect of using moving obstacles was studied, both empirically and numerically, as a new topic on heat transfer and pressure drop in turbulent flow inside the pipe. In this study, the rotating speed of the obstacle ranged from 50 to 100 rpm, and the ranged from 4000 to 24,000. The results revealed that the heat transfer and friction factor changed by 2.2–3.95 and 17.2–22.2 times relative to the smooth tube, respectively. Also, the thermal performance coefficient was 120% more than the stationary obstacles. According to the findings of the current study, studying the effect of obstacle rotation on thermohydraulic characteristics is an innovative and useful topic. Altogether, besides its easy construction, compared to previous reports, the conical obstacle is a suitable obstacle that can be employed to improve thermal performance.

Energy efficiency analysis of a multifunctional hybrid open absorption system for dehumidification, heating, and cooling: An industrial waste heat recovery application

Rising energy consumption for heating, dehumidification, and cooling applications has created a scientific gap to develop new hybrid energy systems which can utilize the available waste heat or renewable energy resources. In this study, a new multifunctional hybrid open absorption system is proposed to utilize the waste heat from moist air or flue gases to supply hot water for heating and to dehumidify the ambient air for further industrial or space cooling applications at the expense of any external heat source for regeneration requirement. This multifunction system consists mainly of two open column absorbers (primary and secondary), condenser, regenerator, heat exchangers and Maisotsenko cycle based dew point indirect evaporative cooler. The secondary absorber recovers the latent heat from moist gas and the primary absorber dehumidifies the ambient humid air for air-conditioning or other cooling applications. Absorbed water vapors from the absorbers are condensed to get the recovered water by transferring the vapor’s latent heat to the circulating water which can be used for heating applications. The thermodynamic and process models of this system are developed to analyze its performance in detail. The effects of important inlet parameters are studied on different performance parameters and the results highlight that the system is capable to provide 176.9 kW heating capacity at the thermal coefficient of performance of 2.223 with heat recovery efficiency of 87.1%. Moreover, this system can recover 115.2 kg/h water in the form of condensate with recovery efficiency of 76.36% and cooling capacity of 9.873 kW can be achieved at system design specifications.

Energy, economic, and environmental (3E) feasibility study of desiccant integrated multistage efficient indirect evaporative air conditioning system configurations in the subtropical climate

This paper presents the experimental-based performance evaluation of three different configurations of desiccant integrated direct/indirect evaporative cooling systems. These configurations include (1) Conventional desiccant cooling system with the direct evaporative cooler on process and regeneration sides (Configuration 1); (2) direct evaporative cooler on the process with indirect evaporative cooler (M-Cycle) on regeneration side (Configuration 2); and (3) indirect evaporative cooler (M-Cycle) on process and regeneration sides (Configuration 3). Each configuration is analyzed in terms of process air supply temperature, process air humidity ratio, thermal coefficient of performance (COPth), and energy efficiency ratio (EER). Based on energy, economic and environmental (3E) analysis subjected to an ambient temperature range of 31–40 °C, 18 g/kg ambient humidity and regeneration temperature of 70 °C; Maximum average value COPth of 0.49, 0.8, 1.7 and EER 3, 4.12, 7 were achieved by configuration 1, 2 and 3, respectively. Present worth cost of configuration 3 for 10 h/day operating time is 13% less as compared to a conventional system with a payback period (PBP) of 6.5 years. As compared to configuration 1, the CO2 emission is reduced by 32% and 38% for configuration 2 and configuration 3, respectively. Hence, the energetic, environmental, and economic evaluation revealed that configuration 3 is best amongst all three configurations in subtropical climate conditions.

Study on heat transfer and dehumidification performance of desiccant coated microchannel heat exchanger

The desiccant coated heat exchanger is capable of dealing with sensible load and latent load of hot and humid air. The heat and moisture transfer coefficients of the desiccant coated microchannel heat exchanger (DMHE) are derived theoretically and increase with the airflow velocity in the heat exchanger. The microchannel structure optimization is implemented. It is found that the smaller the fin pitch and flat tube pitch are, the greater the heat and moisture transfer coefficients are. The thicker the desiccant coating, the larger the moisture transfer coefficient, the smaller the heat transfer coefficient. The experimental results show that the dehumidification capacity and the thermal performance coefficient of DMHE are 1.59 kgh−1 and 2.09 respectively with the regeneration hot water at 60 °C. The Taguchi method is employed to evaluate the influence of cooling water temperature, airflow velocity, and water flow rate on the dehumidification performance of DMHE. The airflow velocity is the main factor affecting the dehumidification capacity, where lower cooling water temperatures and faster the airflow velocity increases the dehumidification performance.

Seasonal energy performance evaluation with new perspective on partial-coupling ejection-compression solar cooling system for modern city buildings

Space cooling accounts for high percentage of energy consumption in modern city building. To improve energy utilizing efficient of space cooling, a new system based on solar partial-coupling ejection-compression refrigeration cycle is studied. Builds are assumed to be located at modern city of Shanghai, with area of 100 m2 for each floor. With a model combining cooling system, building, and weather information, comparative analysis is carried out hourly, using new perspective of total primary energy, during the whole cooling season. For the building with a common height of six-storey in modern city, partial-coupling ejection-compression refrigeration cycle reveals obvious superiority in electric coefficient of performance, solar factor, thermal coefficient of performance, total primary energy, with best value of 6.2, 1, 3.6, and 14 kW, respectively, which helps to reduce carbon dioxide emission. The remarkable difference in auxiliary heat between partial-coupling ejection-compression refrigeration cycle and traditional ejection-compression refrigeration cycle results in the great primary energy saving of partial-coupling cycle, which reveals significant superiority and good suitability of partial-coupling cycle used in multi-stroey buildings in modern city.

Modeling Efficient Hybrid Air Conditioning System

The main objective of the present study is to investigate the thermal performance of the air chiller using the heat exchanger using the chilled water tank by Freon R-134a. The air chiller model was designed and fabricated with all measuring devices in the AL-Muthanna city environment. The practical tests were carried out with a change in the factors governing air coolant performance to investigate their effects on the properties of the system. The study covered the values of the cooling water flow rate at (2l/min) and the evaporator water temperature (2.5 to 5.69 °C) and the return water temperature in the reservoir ranged from 11.6 to 19.2 °C). The greatest coefficient of thermal performance in the system was (5) while the lowest coefficient of thermal performance was (3.6) and that agreement to the experimental studies of this type of system. The results showed that the average guidance in the consumption of air-chilled energy by using the water tank and Freon R-134a was about 13% to 32% compared to the conventional air conditioner. All through the results indicated that the addition of a cooling stage to the conventional cooler inside the testing room results in lowering the temperature (dry temperature) by (27%) and reduced the relative humidity by (36%).

Experimental study of coupled heat and mass transfer phenomena between air and desiccant in a solar assisted thermal liquid desiccant system

Liquid desiccant dehumidification is a promising energy-extensive process for air dehumidification, which can easily be driven by any waste or renewable heat sources. In the current study, a hybrid method is proposed by combining the solar evacuated tube collectors as a regeneration source to drive liquid desiccant system in a close-loop. Subsequently, an experimental setup has been fabricated to assess the performance of the overall system using a novel desiccant mixture. The overall energy balance between the ambient air and the liquid desiccant was also studied. Effects of independent parameters such as solution to airflow rate, solution concentration and temperature on the dehumidifier-regenerator performance parameters such as latent heat ratio, condensation rate, desiccant mass fraction index, evaporation rate, latent and enthalpy effectiveness were analyzed. The result of present investigation showed that high solution to airflow (S/A) ratio enhanced the dehumidification and low S/A ratio enhanced the liquid desiccant regeneration rate. The maximum latent heat ratio for the dehumidifier at the design condition was 0.92, and the thermal coefficient of performance of the system was found as 1.1. The airside pressure drop in the dehumidifier/regenerator was also estimated at different flow rates of desiccant. Further, adaptive neuro-fuzzy inference system (ANFIS) prediction models are developed to predict the system performance as a function of system-independent parameters. The model results exhibited a good agreement with the experimental outcomes. The latent heat ratio and evaporation rate are predicted within a mean absolute percentage error (MAPE) of 2.7% and 2.3%, respectively.

A Study on Improving the Coefficient of Performance by Comparing Balancing Well and Standing Column Well Heat Exchange Systems

This study proposed a technology to improve the performance characteristics and coefficient of performance (COP) of a geothermal system by fundamentally preventing underground water discharge and maintaining a constant temperature of the underground heat exchanger composed of bleed discharge water that utilizes two balancing wells using cross-mixing methods. Using the standing column well (SCW) and cross-mixing balancing well underground heat exchanger, we compared and analyzed the effective thermal conductivity characteristics and COP characteristics during heating and cooling modes. Consequently, the cross-mixing balancing well underground heat exchanger exhibited more effective thermal conductivity than the SCW underground heat exchanger, with a high COP. Therefore, suggesting the performance was improved using groundwater flow rather than SCW. The comparison and analysis results of the effective heat map characteristics using the results of the SCW and balancing well system showed that the heating operation for the SCW underground heat exchanger had better thermal conductivity characteristics than the cooling operation. In addition, regarding a balancing well underground heat exchanger, the cooling operation exhibited superior thermal conductivity characteristics. Thus, the performance was considered to have improved due to the flow of activated groundwater in the ground and the rapid heat transfer without heat accumulation.

Performance enhancement of a cross flow dew point indirect evaporative cooler with circular finned channel geometry

Efficient geometric design has a significant influence on heat transfer characteristics in heat exchanging devices. Performance of a dew point evaporative cooler can be significantly enhanced through geometric modification(s) of dry channel in order to achieve desired cooling effect. In this regard, the current study reports experimental analysis of a finned cross flow dew point indirect evaporative cooler (IEC) working under wide range of operating conditions. The system is designed for a cooling capacity of about 1 kW using circular Aluminum fins which are deployed in the dry channels of IECwf; thereby increasing around 5% in terms of the surface area for enhancement of heat transfer process. While another heat and mass exchanger is used in the dew point Indirect Evaporative Cooler without having extended surfaces (IECwof). Both experimental setups are investigated under similar operating conditions in terms of ambient air temperature (varying between 30 and 45 °C), air humidity (ranging between 10 and 12 g/kg), velocity (varied from 2 to 6 m/s) and water temperature (25–35 °C). Performance of both IECwf & IECwof is investigated in terms of cooling capacity, temperature drop of product air, wet bulb effectiveness, dew point effectiveness and thermal coefficient of performance. The results show that the IECwf has achieved average value of supply air temperature 16.5 °C with cooling capacity of 692 W which are around 25% and 18% enhanced compared to IECwof, respectively. The resulted average COP is 11.24 for IECwf. This efficient dew point IECwf is better suited for residential, commercial and industrial purposes in hot and dry regions.

Experimental Investigation of Desiccant Dehumidification Cooling System for Climatic Conditions of Multan (Pakistan)

In this study, experimental apparatus of desiccant dehumidification was developed at lab-scale, using silica gel as a desiccant material. Experimental data were obtained at various ambient air conditions, while focusing the climatic conditions of Multan (Pakistan). A steady-state analysis approach for the desiccant dehumidification process was used, and thereby the slope of desiccant dehumidification line on psychrometric chart (ϕ*) was determined. It has been found that ϕ* = 0.22 in case of silica gel which is lower than the hydrophilic polymeric sorbent, i.e., ϕ* = 0.31. The study proposed two kinds of systems, i.e., (i) standalone desiccant air-conditioning (DAC) and (ii) Maisotsenko-cycle-assisted desiccant air-conditioning (M-DAC) systems. In addition, two kinds of desiccant material (i.e., silica gel and hydrophilic polymeric sorbent) were investigated from the thermodynamic point of view for both system types, using the experimental data and associated results. The study aimed to determine the optimum air-conditioning (AC) system type, as well as adsorbent material for building AC application. In this regard, perspectives of dehumidification capacity, cooling capacity, and thermal coefficient of performance (COP) are taken into consideration. According to the results, hydrophilic polymeric sorbent gave a higher performance, as compared to silica gel. In case of both systems, the performance was improved with the addition of Maisotsenko cycle evaporative cooling unit. The maximum thermal COP was achieved by using a polymer-based M-DAC system, i.e., 0.47 at 70 °C regeneration temperature.