scholarly journals Energy Consumption Evaluation of Air Cooled Chiller With Cold Storage System Powered by Photovoltaic Modules

2019 ◽  
Vol 4 (3) ◽  
pp. 235-243
Author(s):  
Ishaq Sider ◽  
Maher Al-Maghalseh ◽  
Zaid Alnather
Keyword(s):  
Energy Consumption ◽  
Cold Storage ◽  
Storage System ◽  
Photovoltaic Modules

scholarly journals Systematic Method for the Energy-Saving Potential Calculation of Air-Conditioning Systems via Data Mining. Part I: Methodology

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 81
Author(s):  
Rongjiang Ma ◽  
Shen Yang ◽  
Xianlin Wang ◽  
Xi-Cheng Wang ◽  
Ming Shan ◽  
...  
Keyword(s):  
Data Mining ◽  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Storage System ◽  
Operation Mode ◽  
Systematic Method ◽  
Potential Analysis ◽  
Energy Saving Potential ◽  
Air Conditioning Systems

Air-conditioning systems contribute the most to energy consumption among building equipment. Hence, energy saving for air-conditioning systems would be the essence of reducing building energy consumption. The conventional energy-saving diagnosis method through observation, test, and identification (OTI) has several drawbacks such as time consumption and narrow focus. To overcome these problems, this study proposed a systematic method for energy-saving diagnosis in air-conditioning systems based on data mining. The method mainly includes seven steps: (1) data collection, (2) data preprocessing, (3) recognition of variable-speed equipment, (4) recognition of system operation mode, (5) regression analysis of energy consumption data, (6) constraints analysis of system running, and (7) energy-saving potential analysis. A case study with a complicated air-conditioning system coupled with an ice storage system demonstrated the effectiveness of the proposed method. Compared with the traditional OTI method, the data-mining-based method can provide a more comprehensive analysis of energy-saving potential with less time cost, although it strongly relies on data quality in all steps and lacks flexibility for diagnosing specific equipment for energy-saving potential analysis. The results can deepen the understanding of the operating data characteristics of air-conditioning systems.

scholarly journals Influence of Airflow Field on Food Freezing and Energy Consumption in Cold Storage

2018 ◽  
Vol 53 ◽  
pp. 01038
Author(s):  
Guiqiang Wang ◽  
Xiaohang Cheng ◽  
Zhiqiangè Kang ◽  
Guohui Feng
Keyword(s):  
Energy Consumption ◽  
Field Distribution ◽  
Cold Storage ◽  
Food Products ◽  
Lumped Parameter Model ◽  
Freezing Process ◽  
Load Factor ◽  
Freezing Time ◽  
Food Freezing ◽  
Airflow Field

Currently most food products are cooled and frozen in air-blast cold storage to prolong storage time. The airflow field distribution in storage has a great impact on the process of food freezing and energy cost by that. In this paper, a transient model of food freezing considering airflow field was developed to simulation the temperature profile of air and food products during freezing process. A lumped parameter model was used to predict the temperature and moisture profile of air, which connected all other components together, such as air coolers, food products, envelop enclosure and refrigeration system. A finite difference method was employed to model the heat transfer inside food products during freezing, where the mass transfer was neglected as the food products were wrapped with polystyrene films. Unit load factor method was applied to calculate the sensible heat refrigeration capacity and thus the total capacity of air coolers. The simulation was conducted on a large cold storage filled with large quantities of packaged food products. Results show that there are great differences in airflow field distribution at different locations in cold storage, which lead to spacial differences in freezing time required. Inappropriate set point of freezing time prolongs freezing process unnecessarily and leads to extra energy consumption. Operational mode of air coolers has a great impact on the total energy consumption, as they consume energy themselves and release equivalent heat into storage simultaneously.

Modelling study of the low-pump-power demand constructal T-shaped pipe network for a large scale radiative cooled-cold storage system

2017 ◽  
Vol 127 ◽  
pp. 1564-1573 ◽  
Author(s):  
Kai Zhang ◽  
Dongliang Zhao ◽  
Yao Zhai ◽  
Xiaobo Yin ◽  
Ronggui Yang ◽  
...  
Keyword(s):  
Pump Power ◽  
Cold Storage ◽  
Large Scale ◽  
Storage System ◽  
Power Demand ◽  
Pipe Network ◽  
Modelling Study

scholarly journals Electric Ferry Ecosystem for Sustainable Inter-Island Transport in Philippines: A Pilot Study

2018 ◽  
Vol 8 (6) ◽  
pp. 3570-3575
Author(s):  
E. V. Palconit ◽  
M. L. S. Abundo
Keyword(s):  
Energy Consumption ◽  
Pilot Study ◽  
Energy Management ◽  
Electric Propulsion ◽  
The Other ◽  
Energy Management System ◽  
Photovoltaic Modules ◽  
Pv Module ◽  
First Case ◽  
Pv Modules

An electric boat system as a pilot study for the electric ferry was designed and field-tested in Samal Island, Philippines, to verify sustainability for inter-island transport. This pilot study uses 4.5m monohull with a displacement weight of 343kg. During the experiment, two cases were compared: in the first case the boat was powered solely with batteries and in the other case with the aid of photovoltaic (PV) modules. For the first case, 24V electric propulsion was driven by two 12V, 100Ah batteries, which resulted to a navigational range of around 18, 16 and 15 trips with energy consumption of 111.64Wh, 117.19Wh and 123.92Wh respectively. In the second case, the photovoltaic modules were attached on the boat to supplement the PV used while on sail. Results in the second case showed that PV module supplemented energy was about to 13.4%, 26.8% and 38.7% using three different speeds like 3.18, 3.32 and 3.84knots and the navigational range extended to 4km, 1km, and 14.4km respectively. Therefore, the electric boat with the aid of PV module answers the problem in the energy management system that deals with the sustainability of the system in the inter-island transport in Philippines.

Effect of cascade storage system topology on the cooling energy consumption in fueling stations for hydrogen vehicles

2018 ◽  
Vol 43 (12) ◽  
pp. 6256-6265 ◽  
Author(s):  
E. Talpacci ◽  
M. Reuβ ◽  
T. Grube ◽  
P. Cilibrizzi ◽  
R. Gunnella ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Storage System ◽  
System Topology
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