Novel Environment-friendly Dispersed Power, Display Refrigerator, Exhaust Heat, Supercooling, Desiccant System
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 byproduct, and by using exhaust heat as thermal energy, we can help to minimize the CO2 emissions. In this study, we aimed energy-conservation and carbon dioxide emission reduction of supermarket which introduced a novel environment-friendly dispersed power. At first, we divided the energy consumption devices of the supermarket into the groups of illumination, air conditioning, refrigeration, hot water supply by using purpose and measured the time changes of its energy consumption in each seasons. And we verified the outside and the indoor 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 the refrigeration section was about 60-70% of the whole one of supermarket. It means that the energy reduction of the refrigeration section greatly contributes to energy conservation of supermarket. Most of the energy consumption apparatus of the refrigeration section of the supermarket are refrigerated cabinets and its power consumption highly depended on the indoor air enthalpy and the outside air temperature. When we are going to introduce 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 to heating, we built the demonstration supermarket which equipped environmental friendly dispersed power (gas engine, solar cell, solar heat), and utilized this supermarket for waste heat helpful use. In this study, we tried to increment the condenser exit supercooling of the refrigerated cabinet which had had the biggest energy consumption in a supermarket and, validated its energy conservation effect and carbon dioxide emission reduction one. The cold temperature that 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 the winter because the outside temperature is low. At last we found that when the outside temperature is about 15? or more, supercooling effect appears. In addition, since energy consumption of the refrigerated cabinet is influenced by the indoor enthalpy, we adjusted the indoor air temperature and humidity by introducing the desiccant system and validated its effect.
Study on Energy Conservation an dCarbon Dioxide Emission Reduction of Commercial Display Refrigerator of Supermarket Utilizing the Exhaust Heat from the Novel Environment-Friendly Dispersed Power