Performance of Chiller in a Solar Absorption Air Conditioning System With Partitioned Hot Water Storage Tank

2000 ◽  
Vol 123 (1) ◽  
pp. 48-50 ◽  
Author(s):  
Z. F. Li ◽  
K. Sumathy
Keyword(s):  
Storage Tank ◽  
Air Conditioning ◽  
Lithium Bromide ◽  
Hot Water ◽  
Solar Absorption ◽  
Air Conditioning System ◽  
Water Storage Tank ◽  
Solar Cooling ◽  
Solar Powered ◽  
System Designs

This paper reports the performance of a lithium bromide absorption chiller in a solar powered air conditioning system, when being operated conventionally. The chiller performance based on a modified solar powered absorption air conditioning system which is integrated with a partitioned storage tank has been presented and discussed. It is shown that, by partitioning the storage tank, the chiller performance is not significantly affected, and the solar powered cooling effect can be realized much earlier, achieving a higher total solar cooling COPsystem, compared to the conventional system designs.

The study of solar absorption air-conditioning systems

2005 ◽  
Vol 16 (4) ◽  
pp. 59-66 ◽  
Author(s):  
V Mittal ◽  
KS Kasana ◽  
NS Thakur
Keyword(s):  
Air Conditioning ◽  
Lithium Bromide ◽  
Cooling Systems ◽  
Solar Absorption ◽  
Air Conditioning System ◽  
Heating And Cooling ◽  
Absorption Cooling ◽  
Solar Powered ◽  
Solar Absorption Cooling ◽  
Air Conditioning Systems

An air-conditioning system utilizing solar energy would generally be more efficient, cost wise, if it was used to provide both heating and cooling requirements in the building it serves. Various solar powered heating systems have been tested extensively, but solar powered air conditioning systems have received very little attention. Solar powered absorption cooling systems can serve both heating and cooling requirements in the building it serves. Many researchers have studied the solar absorption air conditioning system in order to make it economically and technically viable. But still, much more research in this area is needed. This paper will help many researchers working in this area and provide them with fundamental knowledge on absorption systems, and a detailed review on the past efforts in the field of solar absorption cooling systems with the absorption pair of lithium-bromide and water. This knowledge will help them to start the parametric study in order to investigate the influence of key parameters on the overall system performance.

Solar-Powered Absorption Chillers for Air-Conditioning Applications: Simulation and Techno-Economic Evaluation

2015 ◽  
Author(s):  
Ali Shirazi ◽  
Sergio Pintaldi ◽  
Robert A. Taylor ◽  
Stephen D. White ◽  
Graham L. Morrison ◽  
...  
Keyword(s):  
Storage Tank ◽  
Air Conditioning ◽  
Control Strategies ◽  
Economic Feasibility ◽  
Hot Water ◽  
Total Cost ◽  
Water Storage Tank ◽  
Solar Fraction ◽  
Study Results ◽  
Solar Powered

This study investigates the techno-economic feasibility of solar-powered absorption cooling and heating systems for a large-sized hotel building in Sydney, Australia. The proposed plant primarily consists of evacuated tube solar collectors, a hot water storage tank, a single-effect absorption chiller, and a backup gas burner. Dynamic simulation of the system has been carried out using the TRNSYS environment. Several control strategies have been implemented in the model to increase the overall efficiency of the system. Solar fraction and levelized total cost of the system have been considered as energetic and economic indicators, respectively. The parametric study results reveal that the optimal values of the storage tank volume and specific collector area are 70 L/m2 and 4 m2 per kW cooling capacity of the chiller, corresponding to the solar fraction of ∼72% and levelized total cost of ∼874,000 AUD/year. Finally, the payback period of the solar equipment is calculated to be 30.8 years, reiterating this technology still needs a great deal of subsidy in order to be economically competitive with conventional air-conditioning systems.

PERFORMANCE OF SOLAR-ASSISTED ABSORPTION CYCLE AIR CONDITIONING SYSTEM

2016 ◽  
Vol 78 (11) ◽  
Author(s):  
Zakaria Jusoh ◽  
Wan Mohd Faizal Wan Mahmood ◽  
Mohd Radzi Abu Mansor
Keyword(s):  
Air Conditioning ◽  
Lithium Bromide ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Small Scale ◽  
Solar Absorption ◽  
Air Conditioning System ◽  
Cycle System ◽  
Absorption Cycle ◽  
Evacuated Tube

A study of the efficiency of the cycle of solar assisted absorption air conditioning system has been carried out. The absorption cycle system has been in operation in Malaysia, but only in large buildings such as the KL International Airport, government buildings in Putrajaya and KLCC buildings. This study focuses on a small-scale lithium-bromide (LiBr) absorption cycle air conditioning system for residential application. The important component of the system has been designed with the capacity of 3.517 kW cooling load suitable for small-capacity application. Generator, condenser, evaporator and absorber have been designed, fabricated, assembled and tested in the laboratory. A total of ninety-pieces of evacuated tube solar collectors have been installed to produce hot water to be used as a heat source to separate the absorbent and refrigerant. Lithium bromide-water pair was used in this experiment. With the concentration of lithium bromide of 33%, the average coefficient of performance (COP) obtained was 0.446, 0.438 and 0.431 for category A, category B and category C respectively. This study shows that the cycle of solar absorption air conditioning system in small scale can be used in Malaysia and tropical climate countries. 

The Effect of Obstacle Geometry and Position on Thermal Stratification in Solar Hot Water Storage Tanks

2008 ◽  
Author(s):  
Necdet Altuntop ◽  
Veysel Ozceyhan ◽  
Yusuf Tekin ◽  
Sibel Gunes
Keyword(s):  
Storage Tank ◽  
Thermal Stratification ◽  
Water Storage ◽  
Hot Water ◽  
Storage Tanks ◽  
Domestic Hot Water ◽  
Water Storage Tank ◽  
Temperature Distributions ◽  
Solar Powered ◽  
Obstacle Geometry

In this study the effect of obstacle geometry and its position on thermal stratification in solar powered domestic hot water storage tanks are numerically investigated. The goal of this study is to obtain higher thermal stratification and supply hot water for usage as long as possible. The temperature distributions are presented for three different obstacle geometries (1, 2 and 3) and six different distances (f = 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8 mm) from the bottom of the hot water storage tank. The numerical method is validated using both experimental and numerical results available in the literature. It is observed from the results that the thermal stratification increases with the increasing obstacle distance from the bottom of the hot water storage tank for obstacle 1 and 3. The obstacle 2 provides less thermal stratification than the obstacles 1 and 3. As a result, in a duration of 30 minutes, the obstacle 3 provides the best thermal stratification for the distance of f = 0.8 mm from the bottom of the hot water storage tank.

scholarly journals Fabrication and Performance Evaluation of Cold Thermal Energy Storage Tanks Operating in Water Chiller Air Conditioning System

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4159
Author(s):  
Xuan Vien Nguyen
Keyword(s):  
Heat Transfer ◽  
Cold Storage ◽  
Storage Tank ◽  
Air Conditioning ◽  
Thermal Storage ◽  
Hot Water ◽  
Operating Costs ◽  
Heat Transfer Fluid ◽  
Storage Tanks ◽  
Air Conditioning System

In this study, cold and thermal storage systems were designed and manufactured to operate in combination with the water chiller air-conditioning system of 105.5 kW capacity, with the aim of reducing operating costs and maximizing energy efficiency. The cold storage tank used a mixture of water and 10 wt.% glycerin as a phase-change material (PCM), while water was used as heat transfer fluid (HTF). The cold storage heat exchanger was made of polyvinyl chloride (PVC). On the other hand, the thermal storage tank used water as the storage fluid with a capacity of 50 L of hot water per hour. The thermal storage did not use a pump for water transfer through the heat exchanger, so as to save energy and operating costs. In this paper, the operating parameters of the cold and thermal storage tanks are shown according to the results of experimental research, including the temperatures of cooling and heating load, heat transfer fluid, and cold storage material during the discharge process, as well as the discharge duration. The system assisted the air conditioner in cooling the internship workshop space at the university with an area of 400 m2, contributing to a remarkable reduction in air-conditioning system operating costs during the daytime. Furthermore, the system recovered waste heat from the compressor of the water chiller, and a thermal storage system was successfully built and operated, providing 50 L of hot water at a temperature of 60 °C per hour to serve the everyday needs of school students. This design was suitable for the joint operation of cold and thermal storage tanks and the water chiller air-conditioning system for cooling and heating applications.

Simulation of an Air-Cooled Solar-Assisted Absorption Air Conditioning System

2001 ◽  
Author(s):  
L. H. Alva Solari ◽  
J. E. González
Keyword(s):  
Storage Tank ◽  
Air Conditioning ◽  
Lithium Bromide ◽  
Thermal Storage ◽  
Ambient Air ◽  
Absorption System ◽  
Air Conditioning System ◽  
Component Design ◽  
Dynamic Cooling ◽  
Cooling Loads

Abstract This paper investigates the technical feasibility of using a compact, air-cooled, solar-assisted, absorption air conditioning system in Puerto Rico and similar regions. Computer simulations were conducted to evaluate the system’s performance when subjected to dynamic cooling loads. Within the computer model, heat and mass balances are conducted on each component of the system, including the solar collectors, thermal storage tank, the air-cooled condenser, and the air-cooled absorber. Guidance on component design and insight into the effects of such operating factors as ambient air temperature were gained from exercising the simulation model. Comparisons are made with an absorption air conditioning system that uses a cooling tower instead of air-cooled components. The particular absorption system of study is one that uses lithium bromide and water as the absorbent and refrigerant, respectively. The heat input to the absorption system generator is provided by an array of flat plate collectors that are coupled to a thermal storage tank. Systems having nominal cooling capacities of 10.5, 14, and 17.5 kW were considered. Useful information about the number of collectors needed, storage tank volume and efficiency of the overall system is presented.

Sign in / Sign up

Export Citation Format

Share Document