Numerical Evaluation and Optimization of the Combined Solar Thermal and Electric Desiccant Cooling System

2009 ◽  
Author(s):  
Napoleon Enteria ◽  
Hiroshi Yoshino ◽  
Akira Satake ◽  
Akashi Mochida ◽  
Ryuichiro Yoshie ◽  
...  
Keyword(s):  
System Performance ◽  
Solar Collector ◽  
Numerical Evaluation ◽  
Cooling System ◽  
Electric Energy ◽  
System Optimization ◽  
Solar Thermal ◽  
Electric Heater ◽  
Operational Parameters ◽  
Performance Reduction

Novel solar thermal desiccant cooling system has been developed. Experimental operation and evaluation of the system was conducted. System optimization and parametric investigation are so important for the improvement of system performance. However, inasmuch as evaluation through experimentation is time consuming and very expensive, numerical model is made and developed for the system. The developed model is implemented in TRNSYS program. The model is validated using the experimental data of the system. Based on the result of the numerical evaluation is conducted the area of the installed solar collector area must be reduced to 8m2. The needed electric heater heating operation is 2 hours. Reduction of the solar collector inclination angle to 30° improved the solar energy collection. Improvement of the desiccant wheel dehumidification rate increased the system total performance. Increasing the heat exchanger (HEX 2) efficiency lowered the supply air temperature with improvement of system performance. Reduction of the system electric energy consumption increased the system electric COP (ECOP). These results of the study are of great importance for the improvement of the design of the developed system, operational procedure, and performance. The relationship and effects of the variables in the study are applicable for other researches seeking the effects of the operational parameters for the solar thermal desiccant cooling system design and processes.

A Novel Design of Triple-Hybrid Absorption Radiant Building Cooling System With Desiccant Dehumidification

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Gaurav Singh ◽  
Ranjan Das
Keyword(s):  
Energy Consumption ◽  
Energy Savings ◽  
Cooling System ◽  
Electric Energy ◽  
Electric Heater ◽  
Operational Strategies ◽  
Electric Energy Consumption ◽  
Radiant Cooling ◽  
Building Cooling ◽  
Novel Design

In air-conditioning, strategy of decoupling cooling and ventilation tasks has stimulated considerable interest in radiant cooling systems with dedicated outdoor air system (DOAS). In view of this, current paper presents a simulation study to describe energy saving potential of a solar, biogas, and electric heater powered hybrid vapor absorption chiller (VAC) based radiant cooling system with desiccant-coupled DOAS. A medium office building under warm and humid climatic condition is considered. To investigate the system under different operational strategies, energyplus simulations are done. In this study, a novel design involving solar collectors and biogas fired boiler is proposed for VAC and desiccant regeneration. Three systems are compared in terms of total electric energy consumption: conventional vapor compression chiller (VCC) based radiant cooling system with conventional VCC-DOAS, hybrid VAC-based radiant cooling system with conventional VCC-DOAS, and hybrid VAC-based radiant cooling system with desiccant-assisted VCC-DOAS. The hybrid VAC radiant cooling system and desiccant-assisted VCC-DOAS yields in 9.1% lesser energy consumption than that of the VAC radiant cooling system with conventional VCC-DOAS. Results also show that up to 13.2% energy savings can be ensured through triple-hybrid VAC radiant cooling system and desiccant-assisted VCC-DOAS as compared to that of the conventional VCC-based radiant system. The return on investment is observed to be 14.59 yr for the proposed system.

scholarly journals Numerical optimization of a multistage sorption compressor

2021 ◽  
Vol 2116 (1) ◽  
pp. 012113
Author(s):  
A Hamersztein ◽  
A Davidesko ◽  
N Tzabar
Keyword(s):  
Numerical Model ◽  
High Pressures ◽  
Cooling System ◽  
Cell Envelope ◽  
High Reliability ◽  
Pressure Fluctuations ◽  
Electric Heater ◽  
Operational Parameters ◽  
Operating Life ◽  
Dimensional Parameters

Abstract Sorption compressors are driven by thermal cycles and have no moving parts, excluding some passive check valves. Such compressors are suitable for powering Joule-Thomson (JT) cryocoolers and can provide reliable and vibration free active cooling system with a potential for high reliability and long operating life. The thermal cycle consists of cooling and heating a sorbent material which is installed in a sorption cell, where the heating is obtained by an inner electric heater and cooling is obtained by the surrounding via the sorption cell envelope. The investigation and optimization of the sorption cells were conducted in previous work, at steady state conditions, by a one-dimensional heat and mass transfer numerical model. The current paper presents a dynamic numerical model of sorption compressors which consist of several sorption cells. The numerical model allows one to three compression stages, with any number of sorption cells at each stage. The model enables the investigation of dimensional parameters and operational parameters, and provides the low and high pressures, pressure fluctuations, and compressor’s efficiency. The current investigation focuses on a three-stage compressor for nitrogen, with low and high pressures of 0.2 and 8 MPa, respectively, and a mass flow rate of about 11 mg/s.

Optimization Position and Tilt Angle for Automatic Tracking Solar Collector in Solar Thermal Cooling System of Building MRC FTUI

2015 ◽  
Vol 780 ◽  
pp. 75-80 ◽  
Author(s):  
Nasruddin ◽  
Aldi Suyana ◽  
Budihardjo ◽  
Arnas
Keyword(s):  
Tilt Angle ◽  
Solar Collector ◽  
Cooling System ◽  
Hot Water ◽  
Solar Thermal ◽  
Parameter Study ◽  
Power Efficient ◽  
System Utilization ◽  
Solar Thermal Cooling ◽  
Thermal Cooling

The solar thermal cooling system is expected to replace the utilization of conventional cooling system, particularly the vapour compression system. This cooling system is power-efficient, refrigerant environmentally friendly and able to use the abundant potential of solar energy. Hence, the optimization of this cooling system is necessary in order to obtain the best performance. For that purpose, this study focus on the simulation phase of the solar thermal cooling system utilization in MRC FTUI building as well as the optimization of solar collector applying EnergyPlus and GenOpt software. The position and the tilt angle of solar collector set as parameter study to gain the best performance of solar collector to produce hot water, which will be used as energy source in the absorption chiller. Finally, the optimum position and the optimum tilt angle every month in a year were obtained from this study.

Multidisciplinary Optimization of Airfoil Cooling Structure

2008 ◽  
Author(s):  
Grzegorz Nowak
Keyword(s):  
Cooling System ◽  
Computational Cost ◽  
System Optimization ◽  
Multidisciplinary Optimization ◽  
Internal Cooling ◽  
Technical Problems ◽  
Thermal Boundary Conditions ◽  
Optimization Task ◽  
External Conditions ◽  
Cooling Air

This paper discusses the problem of cooling system optimization within a gas turbine airfoil regarding to thermo-mechanical behavior of the component, as well as some economical aspects of turbine operation. The main goal of this paper is to show the possibilities of evolutionary approach application to the cooling system optimization. This method, despite its relatively high computational cost, seems to be a valuable tool to such technical problems. The analysis involves the optimization of location and size of internal cooling passages within an airfoil. Initially cooling is provided with circular passages and heat is transported by convection. During the optimization the number of channels can vary. The task is approached in 3D configuration. Each passage is fed with cooling air of constant parameters at the inlet. Also a constant pressure drop is assumed along the passage length. The thermal boundary conditions in passages vary with diameter and local vane temperature (passage wall temperature). The analysis is performed by means of the genetic algorithm for the optimization task and FEM for the heat transfer predictions within the component. In the present study the airfoil profile is taken as aerodynamically optimal and the objective of the search procedure is to find cooling structure variant that at given external conditions provides lower stresses, material temperature and indirectly coolant usage.

Heat dissipation system based on electromagnetic driven rotational flow of liquid metal coolant

2021 ◽  
pp. 1-14
Author(s):  
Lei Wang ◽  
Xudong Zhang ◽  
Dr. Jing Liu ◽  
Yixin Zhou
Keyword(s):  
Liquid Metal ◽  
Thermal Resistance ◽  
Heat Dissipation ◽  
High Efficiency ◽  
Cooling System ◽  
Electric Heater ◽  
Power Relationship ◽  
Rotational Flow ◽  
Large Power ◽  
Dissipation System

Abstract Liquid metal owns the highest thermal conductivity among all the currently available fluid materials. This property enables it to be a powerful coolant for the thermal management of large power device or high flux chip. In this paper, a high-efficiency heat dissipation system based on the electromagnetic driven rotational flow of liquid metal was demonstrated. The velocity distribution of the liquid metal was theoretically analyzed and numerically simulated. The results showed that the velocity was distributed unevenly along longitudinal section and the maximum velocity appears near the anode. On the temperature distribution profile of the heat dissipation system, the temperature on the electric heater side was much higher than the other regions and the role of the rotated liquid metal was to homogenize the temperature of the system. In addition, the thermal resistance model of the experimental device was established, and several relationships such as thermal resistance-power curve were experimentally measured. The heating power could be determined from the temperature-power relationship graph once the maximum control temperature was given. The heat dissipation method introduced in the paper provides a novel way for fabricating compact chip cooling system.

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