ShareCold stores safety and energy consumption
During the IIR International Congress of Refrigeration, held in Yokohama in August 2015, two valuable papers focused on cold store energy consumption and safety issues.
During the IIR International Congress of Refrigeration, held in Yokohama in August 2015, two valuable papers focused on cold store energy consumption and safety issues:
Judith Evans et al presented the results of a study* on energy use in cold stores. Cold storage rooms consume considerable amounts of energy. Within cold storage facilities, 60-70% of the electrical energy may be used for refrigeration. Previous surveys demonstrated that energy savings of around 30-40% were achievable by optimizing usage of the stores, repairing current equipment and by retrofitting of energy efficient equipment.
As part of a large project on cold store energy performance, internet based surveys were developed and data collected to determine energy usage in different cold store types, sizes and configurations. The data set analyzed was 167 chilled stores, 187 frozen stores and 75 mixed stores in 23 different countries. The specific energy consumption (SEC) for the cold stores examined varied considerably. Data from all stores with the 20% upper and lower values removed show the following mean specific energy consumption: 50.2 kWh/m3/year for chilled stores and 66.2 kWh/m3/year for frozen and mixed stores. A comparison of energy usage in different parts of the world was done.
Also mathematical models were developed to assist end users to reduce energy consumption and to identify how much energy a store should use in different usages and configurations.
* Specific energy consumption values for refrigerated food cold stores, J. Evans et al.
Direct link to this paper in Fridoc: http://goo.gl/owF1gJ
Shen Tian et al reported* on a detection method of ammonia leakage. According to some statistics, 12 tremendous ammonia refrigeration systems leakage accidents happened in China from 2010 to 2013 and resulted in a large number of casualties. The accidents caused great damages because the pipelines ruptured suddenly and the leakage accidents tended to spread rapidly, especially from the cold liquid lines. At the same time, operating staff could not cut the risk off without exact knowledge of leakage locations. This demonstrates the importance of improving ammonia automatic detection technology for rapid warning and leakage detection. The ammonia leakage detection method proposed consists in analyzing in real time the transient behaviors of pressure and flow rate in the cold liquid line. A computer program to detect leakage and locate leakage points was developed with LabVIEW. Compared with the experimental results, the detection program shows good accuracy in the detection of small leakages at + 5% and location estimation error less than ±16% within 10 seconds.
* Detection method of ammonia leakage from liquid line of cold storage refrigeration system based on pressure and flow rate, Shen Tian et al.
Available via Fridoc: http://goo.gl/aUtRE6
Judith Evans et al presented the results of a study* on energy use in cold stores. Cold storage rooms consume considerable amounts of energy. Within cold storage facilities, 60-70% of the electrical energy may be used for refrigeration. Previous surveys demonstrated that energy savings of around 30-40% were achievable by optimizing usage of the stores, repairing current equipment and by retrofitting of energy efficient equipment.
As part of a large project on cold store energy performance, internet based surveys were developed and data collected to determine energy usage in different cold store types, sizes and configurations. The data set analyzed was 167 chilled stores, 187 frozen stores and 75 mixed stores in 23 different countries. The specific energy consumption (SEC) for the cold stores examined varied considerably. Data from all stores with the 20% upper and lower values removed show the following mean specific energy consumption: 50.2 kWh/m3/year for chilled stores and 66.2 kWh/m3/year for frozen and mixed stores. A comparison of energy usage in different parts of the world was done.
Also mathematical models were developed to assist end users to reduce energy consumption and to identify how much energy a store should use in different usages and configurations.
* Specific energy consumption values for refrigerated food cold stores, J. Evans et al.
Direct link to this paper in Fridoc: http://goo.gl/owF1gJ
Shen Tian et al reported* on a detection method of ammonia leakage. According to some statistics, 12 tremendous ammonia refrigeration systems leakage accidents happened in China from 2010 to 2013 and resulted in a large number of casualties. The accidents caused great damages because the pipelines ruptured suddenly and the leakage accidents tended to spread rapidly, especially from the cold liquid lines. At the same time, operating staff could not cut the risk off without exact knowledge of leakage locations. This demonstrates the importance of improving ammonia automatic detection technology for rapid warning and leakage detection. The ammonia leakage detection method proposed consists in analyzing in real time the transient behaviors of pressure and flow rate in the cold liquid line. A computer program to detect leakage and locate leakage points was developed with LabVIEW. Compared with the experimental results, the detection program shows good accuracy in the detection of small leakages at + 5% and location estimation error less than ±16% within 10 seconds.
* Detection method of ammonia leakage from liquid line of cold storage refrigeration system based on pressure and flow rate, Shen Tian et al.
Available via Fridoc: http://goo.gl/aUtRE6