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Study on energy conservation and carbon dioxide emission reduction of commercial display refrigerator of supermarket utilizing the exhaust heat from the novel environment-friendly dispersed power.

Number: pap. 2473

Author(s) : SHIKANO T., BAE S., KATSUTA M., et al.

Summary

Since the nuclear disaster was caused by the Great East Japan Earthquake in 2011, Japanese energy generation system has been expected to prioritize safety and trustworthiness. To meet this requirement, distributed power supply systems, such as gas engine, fuel cell, photovoltaic system, and solar heat, are considered to be one of solutions. By producing electricity, these systems generate thermal energy as a by-product, and by using exhaust heat as thermal energy, we can help to minimize the CO2 emissions. In this study, we aimed to conserve energy and to reduce carbon dioxide emission of supermarket to which installed a novel environment-friendly dispersed power. At first, we divided energy consumption devices of a supermarket into four groups of lightning, air conditioning, refrigeration, hot water supply by purpose of usage and we measured the time changes of the energy consumption in each seasons. And we verified outside and inside air conditions, and the operation characteristics of individual energy consumption devices. The supermarket we measured, is located in Isesaki-city, the northern Kanto region in Japan. From this measurement, we understood that the annual energy consumption of refrigeration apparatus was about 60-70% of the total energy consumption of supermarket. It means that to reduce energy of the refrigeration apparatus greatly contributes to energy conservation of supermarket. Most of energy consumption apparatus of refrigeration apparatus of supermarket are refrigerated cabinets, and its power consumption highly depended on inside air enthalpy and outside air temperature. When we install dispersed power into a certain facility, the biggest problem that should be solved is annual utilization rate increase in exhaust heat. Because the annual utilization rate increment of the exhaust heat was not guaranteed by using only for heating, we built small scale model of supermarket which was equipped environmental friendly dispersed power such as gas engine, solar cell, solar heat, and we examined this scale model supermarket for waste heat usage. In this study, we tried to increase the degrees of supercooling at condenser exit of the refrigerated cabinet which had had the biggest energy consumption in a supermarket. We validated its energy conservation effect and carbon dioxide emission reduction effect. The cold temperature heat used for supercooling was manufactured by adsorption type refrigerator. The energy conservation effect of supercooling is about from 10 to 25% during the summertime and intermediate time. However there is no effect of supercooling in wintertime because outside temperature is low. At last, we found that when outside temperature is about 15°C or more, supercooling effect appears. In addition, since energy consumption of the refrigerated cabinet is influenced by inside enthalpy, we adjusted the inside air temperature and humidity by installing desiccant system and examined its effect.

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Pages: 10 p.

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Details

  • Original title: Study on energy conservation and carbon dioxide emission reduction of commercial display refrigerator of supermarket utilizing the exhaust heat from the novel environment-friendly dispersed power.
  • Record ID : 30013420
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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