Improving the performance of air conditioning systems by using phase change materials: A review

2019 ◽  
Vol 43 (10) ◽  
pp. 5175-5198 ◽  
Author(s):  
Adil A.M. Omara ◽  
Abuelnour A. A. Abuelnour
Keyword(s):  
Phase Change ◽  
Air Conditioning ◽  
Phase Change Materials ◽  
Air Conditioning Systems

Phase change materials development from salt hydrate for application as secondary refrigerant in air-conditioning systems

2017 ◽  
Vol 24 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Muhammad Irsyad ◽  
Aryadi Suwono ◽  
Yuli Setyo Indartono ◽  
Ari Darmawan Pasek ◽  
Muhammad Akbar Pradipta
Keyword(s):  
Phase Change ◽  
Air Conditioning ◽  
Phase Change Materials ◽  
Materials Development ◽  
Salt Hydrate ◽  
Air Conditioning Systems

Experimental Evaluation of Fundamental and Phase Change Characteristics for Carbon-Based Suspensions

2018 ◽  
Vol 775 ◽  
pp. 210-216
Author(s):  
Tun Ping Teng ◽  
Ting Chiang Hsiao ◽  
Chun Chi Chung
Keyword(s):  
Thermal Conductivity ◽  
Contact Angle ◽  
Phase Change ◽  
Air Conditioning ◽  
Phase Change Materials ◽  
Freezing Temperature ◽  
Ice Storage ◽  
Change Characteristics ◽  
Air Conditioning Systems ◽  
Carbon Based

In this study, carbon-based materials prepared using an isoperibol oxygen bomb calorimeter of varying oxygen pressure were added to water to form carbon-based suspensions (CBSs). The thermal conductivity, viscosity, density, and contact angle of CBSs were measured by appropriate instruments to understand the fundamental characteristics of CBSs. A differential scanning calorimeter (DSC) was used to measure and analyze the phase change characteristics of CBSs to evaluate the feasibility of employing CBSs as phase change materials (PCMs) in ice-storage air-conditioning systems. The experimental results revealed that the thermal conductivity, viscosity, and density of CBSs did not significantly change but a significant reduction in the contact angle of sample’s droplets occurred compared with that of water. The CBS of S5 had the lowest melting temperature and subcooling degree (SD) and highest freezing temperature in the DSC experiments; thus, S5 was determined to be the most suitable CBS for use as a PCM in this study.

Condensation Induced Shock in Thermal/Fluid Systems

2012 ◽  
Author(s):  
Amir Jokar ◽  
Erik W. Christiansen
Keyword(s):  
Shock Waves ◽  
Phase Change ◽  
Air Conditioning ◽  
Industrial Applications ◽  
Governing Equations ◽  
Cooling Systems ◽  
Heating And Cooling ◽  
Fluid Systems ◽  
Air Conditioning Systems ◽  
Effective Life

Phase-change through condensation and evaporation processes takes place in many daily-use heating and cooling systems. However, if these processes experience uncontrolled pressure and temperature conditions, shock waves may be generated. Depending on the strength and conditions of the generated waves, they can decrease the effective life of equipment or even cause devastating destruction. Cavitation and water hammer phenomena are examples of flow issues that are well understood and reported in thermal/fluid systems, although not many studies have been published in open literature on condensation-induced shock (CIS) with the applications in refrigeration and air conditioning systems. This study reviews the limited literature on this topic, analyze the complex CIS phenomenon, derives and solves the governing equations, presents the results of typical conditions that may happen in different residential and industrial applications, and provides ways to avoid devastating incidents that may occur as a result of this phenomena.

scholarly journals Air Conditioning Using Waste Heat and Solar Energy with Phase Change Materials

2014 ◽  
Vol 52 ◽  
pp. 579-587
Author(s):  
Joseph Stalin ◽  
Barath ◽  
Gokula manikandan
Keyword(s):  
Solar Energy ◽  
Phase Change ◽  
Air Conditioning ◽  
Phase Change Materials ◽  
Waste Heat

Study on Dispersion Stability Characteristics of TiO2 Nanoparticles in PCM for Use in Cold Storage Air-Conditioning

2019 ◽  
Vol 972 ◽  
pp. 159-164
Author(s):  
Xiao Yan Li ◽  
Xin Yue Miao
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Phase Change ◽  
Cold Storage ◽  
Air Conditioning ◽  
Phase Change Materials ◽  
Ultrasonic Time ◽  
Nanoparticles Concentration ◽  
Dispersion Condition ◽  
Nanocomposite Pcm

A new organic phase change materials (PCM) for cool storage was developed for use in cold storage air-conditioning. The thermal properties of the new organic PCM were measured with a differential scanning calorimeter (DSC). To improve the thermal conductivity of the new organic PCM, the further research of using nanocomposite technology to the organic PCM SSW-4 was made. The effects of nanoparticles concentration on dispersion, ultrasonic time and consistence of dispersant in the best ultrasonic time on the dispersion were investigated by experiment. The results showed that the thermal conductivity of the nanocomposite PCM TiO2 /SSW-4 increased by approximately 16.27% compared to that of the organic PCM SSW-4. The best dispersion condition of preparation for TiO2 /SSW-4 was confirmed.

Surface Modification of Silver Nanoparticles in Phase Change Materials for Building Energy Application

2012 ◽  
Vol 622-623 ◽  
pp. 889-892 ◽  
Author(s):  
Shah Kwok Wei
Keyword(s):  
Silver Nanoparticles ◽  
Phase Change ◽  
Air Conditioning ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Silica Coating ◽  
Building Energy ◽  
Energy Application ◽  
The Stability ◽  
Corrosive Environments

In this report, we propose a direct silica-coating technique to enhance the stability of silver nanoparticles as a doping additive to enhance the thermal conductivity phase change materials (PCM). Our experimental results show that a thin layer of silica can protect silver nanoparticles and help retain its intrinsic metallic properties, when subjected to harsh corrosive environments found in PCM media. Furthermore, PCM materials can be effectively used to cool the ambient temperature of a building room by up to ~1.2 degree Celsius. Our preliminary results demonstrate a real opportunity in air-conditioning energy-savings for buildings using enhanced PCM.

Use of Finite Element Method in Study of Air Conditioning Clothes

2012 ◽  
Vol 217-219 ◽  
pp. 1209-1212
Author(s):  
Shu Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Phase Change ◽  
Engineering Design ◽  
Air Conditioning ◽  
Phase Change Materials ◽  
Thermal Flux ◽  
Nonlinear Problems ◽  
Conditioning Effect ◽  
Element Method

Finite element method is useful in research of nonlinear problems, and this method has been an obbligato tool in scientific research, engineering design, and product optimization. This paper aims to use finite element method in the study of air-conditioning clothes, for simulating the thermal flux in the microenvironment of body-clothes- macroclimate. Phase change materials are put on clothes to realize the air conditioning effect. NX nastran is adopted to do the simulation and analysis, and proved to be effective.

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