Evaluation of the heating time for frozen products in blocks during storage in a sealed container of machine-free cold supply using dry ice

Authors: V.F. Didenko, A.N. Scherbyak, A.Yu. Zaitsev, A.N. Chikulaev

Abstract

In the paper, a mathematical model is proposed for calculating the heating (defrosting) time of pre-frozen products from -18° С to -8° C. The analytical solution of the differential equation of Fourier thermal conductivity with initial conditions of the third kind makes it possible to calculate the heating time of the production at machine-free cooling of the container due to the product's accumulative holdover cold. The design model allows to calculate the required amount of dry ice, the cooling capacity of which is sufficient to compensate for external heat inflows, which have been obtained on the basis of the container's heat balance, and thus prevent a temperature rise above —8° С during the estimated 30 days of storage. The calculations performed determine the maximum amount of product a container can hold and specify the maximum possible thickness of the container's insulation, based on which the heat transfer coefficient from the external medium to the cargo is defined.

Keywords: container, frozen products, machine-free cooling, dry ice, heating (defrostation), differential Fourier equation, heat conductivity, mathematical model.

References

Fishbein B.D., Lisevich Т.В., Titova E.N., Kotelnikov R.I. Metodicheskie ukazaniya k vypolneniyu laboratornykh rabot po distsipline «Egergokholodil'nye sistemy vagonov i ikh remont» [Methodical instructions for the performance of laboratory work on the discipline "Energo-cooling systems of wagons and their repair"]. Samara, SamG APS, 2004, 44 p. [In Russian]
Egorov V.I. Tochnye metody resheniya zadach teploprovodnosti. Uchebnoe posobie [Exact methods for solving heat conduction problems. Tutorial.]. St. Petersburg, SPbGUITMO Publ., 2006, 48 p. [In Russian]
Lobasova M.S. , Dekterev A.A., Serebrennikov D.S.. Teplomassoobmen: uchebnoe posobie k prakticheskim zanyatiyam [Heat and mass transfer: a textbook for practical studies]. Krasnoyarsk, IPK SFU, 2009. (Teplomassoobmen: UMKD № 1536-2008 / rukovoditel' tvorcheskogo kollektiva [Heat and mass transfer: Educational-methodical complex № 1536-2008 / head of the creative team] M.S. Lobasova). [In Russian]
Dzyuba I.S. Perevozka skoroportyashchikhsya gruzov. Posobie dlya kursovogo i diplomnogo proektirovaniya [Transportation of perishable goods. Allowance for course and diploma design]. Gomel, BelGUT Publ., part 1, 2000, 45 p. [In Russian]

About authors

Didenko Vladimir - PhD, associate professor, professor, St. Petersburg State Maritime Technical University (SMTU), 3, Lotsmanskaya st., 190121, St. Petersburg, Russia

Scherbyak Anton - SMTU, 3, Lotsmanskaya st., 190121, St. Petersburg, Russia, e-mail: anton.sherbyak@mail.ru

Zaitsev Alexander - SMTU, 3, Lotsmanskaya st., 190121, St. Petersburg, Russia

Chikulaev Andrey - LLC “TRANSGEO”, 9/1, Eleninskaya st., 198412, Lomonosov, Russia

Issue: 48/49 (2017)

For citation: V.F. Didenko, A.N. Scherbyak, A.Yu. Zaitsev, A.N. Chikulaev. Evaluation of the heating time for frozen products in blocks during storage in a sealed container of machine-free cold supply using dry ice. Research Bulletin by Russian Maritime Register of Shipping. 2017, No. 48/49, pp. 117-123.

* * *

UDC: 664.004.12:536.2
Pages: 117-123