Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Experimental Study on the Influence of the Rolling Angle of the Deep Sea Trawler on the Refrigeration
Efficiency of the Cold Storage
Hao Cai 1，Qingchao Xu 1 , Panpan Jia 1，Detang Li 1，Wei Wang 1,2,3，Yonghe Xie1*
1.School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan, Zhejiang, China
2.School of Naval Architecture Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai, China
3.Marine Design and Research Institute of China, Shanghai, China.

ABSTRACT

number of delicious fish for urban and rural residents at home and abroad.

Fishing boat cold storage is an important auxiliary machinery for fishingboats, it is the living guarantee for the crew, and it is also the fundamental
guarantee for the preservation of fish catches. When fishing boats sailingin the ocean, the first thing is to ensure the cooling effect of the cold
storage, and the second is to ensure the cooling efficiency of the cold
storage. In this paper, the method of the actual sea test is used to study
the relationship between the average roll angle of the trawler and therefrigeration efficiency of the cold storage caused by the fishing boat
sailing on top of the waves. The research results show that the averageroll angle of the trawler and the shaking frequency of the hull have acertain influence on the refrigeration efficiency of the cold storage. Thisconclusion provides a technical reference for improving the refrigeration
efficiency of the cold storage.
.
KEY WORDS: trawler; cold storage; average roll angle; temperaturecontrol; refrigeration efficiency.

At present, in the marine fishery fishing industry, with the developmentof marine transportation and distant-water fishing, the reduction of
offshore fishery resources and the distance between fisheries arebecoming more distant. Refrigerated and quick-freezing units topreserve caught fish products, semi-processed products and finishedproducts. If the refrigeration system in the link is abnormal, it will not
only cause unnecessary economic losses and waste, but also may
endanger human health and affect the reputation of the enterprise.
Therefore, the reliability and stability of the refrigeration system are very
important.
At present, Chinese fishing boats are limited by various factors, such as
limited economy, size of fishing boats, and cabin layout. At present, its
refrigeration control system is still in the traditional control mode ofrelays and contactors. It has the disadvantages of poor reliability, highfailure rate, and high power consumption, and it cannot monitor thedistance. The key is that it is not easy to operate and needs manual
inspection.

INTRODUCTION

In view of the above-mentioned shortcomings of the traditional
refrigeration control technology for fishing vessels, and under thepremise that the cost increase is not large and the requirements for
operators cannot be too high, the reliability of the refrigeration system of
the fishing vessel can be further improved, the difficulty of maintenanceis reduced, and the refrigeration process is improved. It is of greatsignificance to improve the performance of the refrigeration system forpelagic fisheries.

The refrigeration system design of the cold storage is a key part of thefishing boat design. The fresh-keeping of fishing boats in our country
has gone through a process from cooling with ice to micro-freezing, anduntil the 1980s, the quick-freezing and fresh-keeping process commonlyused by steel fishing boats. With the sharp decline of offshore fisheryresources, China has opened up a large-scale pelagic fishery. Due to theincrease of the distance from the fishing ground and the increase of thecatch, the ocean-going fishing boat has many special requirements forthe performance, self-sustaining force and electromechanical equipmentof the ship, especially for the first-line freezing and fresh-keeping of thecatch. From the refrigeration device of the ocean-going West African
fishing boat in the mid-1980s to the refrigeration design of the oceangoing fishing boat that opened up the Indonesian and Myanmar fishingareas in recent years, the fishing boats operating in the two ocean-goingfishing areas of West Africa and Indonesia, with their perfectrefrigeration equipment, have created Huge benefits, providing a large

Cai ,Qi,Wang and Li(2003) proposed that the relatively advanced fishingboats in our country began to gradually adopt a control system for thecold storage and refrigeration system that combines the upper computer
and the lower computer. The upper computer refers to a computer thatpeople can directly issue control commands, usually a PC, and various
signal changes are displayed on the screen. The command sent by theupper computer is first given to the lower computer, and the lower
computer interprets the command into a corresponding timing signal to3547