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成果報告書詳細
管理番号20170000000347
タイトル*平成28年度中間年報 再生可能エネルギー熱利用技術開発 その他再生可能エネルギー熱利用トータルシステムの高効率化・規格化 太陽熱を利用した熱音響冷凍機による雪室冷却装置の開発  
公開日2017/6/15
報告書年度2016 - 2016
委託先名新潟県工業技術総合研究所 学校法人東海大学 新潟機器株式会社
プロジェクト番号P14017
部署名新エネルギー部
和文要約
英文要約Title:Development of Yukimuro cooling unit using thermoacoustic refrigerator driven by solar power (FY2015-FY2018) FY2016 Annual Report

Yukimuro is used as an air-conditioner in summer season which preserves vegetables, rice, and liquor in a heavy snowfall area.
In this study, to reduce the initial cost of Yukimuro by 17-18%, the size of Yukimuro is decreased by using the thermoacoustic refrigerator driven by solar power and improved walls of prefabricated refrigerators.

1. Development of thermoacoustic refrigerator
The thermoacoustic refrigerator needed to be driven at low temperature of 200℃ or less, due to the difficulty in collecting heat of high temperature from solar power. So, a multistage engine was adopted to drive the refrigerator. Accordingly, two types of thermoacoustic refrigerators (double-loop-type and a symmetric-type) were used.
A double-loop-type had two loops connected by a branch pipe. One loop had three engines and the other had a refrigerator. A symmetric type had three engines and a refrigerator set symmetrically in a loop. In order to achieve the low temperature driving, both cases are under consideration.

2. Design and estimation of heat circulation system using solar thermal collector
The heat circulation system was consisted of an array of evacuated tube collectors, piping of a working fluid, a pump, and an expansion tank. The solar thermal energy collected by the tube collectors was transferred to the thermoacoustic engines by the working fluid.

3. Total simulation of the system
(1) The heat balance of the system
The heat balance of the system was calculated. The output power of the thermoacoustic refrigerator was estimated around 1kW, which led a reduction in the standard size. The cold energy of the snow in the Yukimuro and the thermoacoustic refrigerator exceeded the sum of the energy consumed in the house and entering into the Yukimuro from outside.

(2) Air circulation simulation
The warm air from the rooms was cooled in the Yujkimuro and sent back to the rooms. The simulations have been done for the air circulation that cooled the warm air effectively.

(3) Survey of Yukimuro
The Yukimuro was practically investigated. In the Yukimuro guidelines issued by Niigata Prefecture, an underfloor drainage channel was recommended for air circulation. However, in our investigation there was no underfloor drainage channel, and it was observed that the warm air was sufficiently cooled even if the air circulation was partial in the Yukimuro.
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