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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Foods and Raw Materials</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Foods and Raw Materials</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Foods and Raw Materials</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="print">2308-4057</issn>
   <issn publication-format="online">2310-9599</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">105486</article-id>
   <article-id pub-id-type="doi">10.21603/2308-4057-2026-2-684</article-id>
   <article-id pub-id-type="edn">SYRDUP</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>Research Article</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>Research Article</subject>
    </subj-group>
    <subj-group>
     <subject>Research Article</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Experimental recirculating carbon dioxide refrigeration unit</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Experimental recirculating carbon dioxide refrigeration unit</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3542-786X</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Neverov</surname>
       <given-names>Evgeniy N.</given-names>
      </name>
      <name xml:lang="en">
       <surname>Neverov</surname>
       <given-names>Evgeniy N.</given-names>
      </name>
     </name-alternatives>
     <email>neverov42@mail.ru</email>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4546-0276</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Korotkih</surname>
       <given-names>Pavel S.</given-names>
      </name>
      <name xml:lang="en">
       <surname>Korotkih</surname>
       <given-names>Pavel S.</given-names>
      </name>
     </name-alternatives>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3782-2521</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Gorelkina</surname>
       <given-names>Alena K.</given-names>
      </name>
      <name xml:lang="en">
       <surname>Gorelkina</surname>
       <given-names>Alena K.</given-names>
      </name>
     </name-alternatives>
     <xref ref-type="aff" rid="aff-3"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1349-2812</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Timoshchuk</surname>
       <given-names>Irina V.</given-names>
      </name>
      <name xml:lang="en">
       <surname>Timoshchuk</surname>
       <given-names>Irina V.</given-names>
      </name>
     </name-alternatives>
     <xref ref-type="aff" rid="aff-4"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-3">
    <aff>
     <institution xml:lang="ru">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-4">
    <aff>
     <institution xml:lang="ru">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Kemerovo State University</institution>
     <city>Kemerovo</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2025-10-20T00:00:00+03:00">
    <day>20</day>
    <month>10</month>
    <year>2025</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2025-10-20T00:00:00+03:00">
    <day>20</day>
    <month>10</month>
    <year>2025</year>
   </pub-date>
   <volume>14</volume>
   <issue>2</issue>
   <fpage>377</fpage>
   <lpage>385</lpage>
   <history>
    <date date-type="received" iso-8601-date="2024-12-06T00:00:00+03:00">
     <day>06</day>
     <month>12</month>
     <year>2024</year>
    </date>
    <date date-type="accepted" iso-8601-date="2025-06-03T00:00:00+03:00">
     <day>03</day>
     <month>06</month>
     <year>2025</year>
    </date>
   </history>
   <self-uri xlink:href="https://jfrm.ru/en/issues/23601/23924/">https://jfrm.ru/en/issues/23601/23924/</self-uri>
   <abstract xml:lang="ru">
    <p>Turkey farming and meat processing are fast-developing areas of the Russian food industry. However, their development requires more advanced methods of meat storage and freezing. Traditional methods of air cooling often fail to preserve the original meat texture and nutritional value. This paper introduces a new refrigeration unit with CO2 as a refrigerant. CO2 snow and gas come in direct contact with turkey carcasses, thus accelerating the cooling process and improving the meat quality. CO2 recirculation makes the refrigeration unit an economical solution to environmental issues. The refrigeration unit included a conveyor system, a vacuum chamber, and a CO2 circulation system.&#13;
The research featured grade 1 turkey carcasses of 2.7 ± 0.1 kg frozen at different temperatures (–30, –50, and –70°C) and CO2 flux rates (0–5 m/s). The share of CO2 in the gas mix was ≥ 50%. The temperature and heat flux density were measured using thermocouples and heat flux probes.&#13;
As the temperature dropped from –30 to –70°C, the freezing time decreased from 48 to 33 min and to 29 min when the experiment involved enforced convection. The amount of CO2 consumed increased from 7.5 to 13.5 kg without convection and from 6.5 to 12.0 kg with enforced convection. Compared to traditional methods, CO2 provided uniform freezing and reduced mechanical damage to the meat structure.&#13;
The newly developed refrigeration unit with recirculated CO2 demonstrated high efficiency in freezing turkey meat while reducing CO2 consumption and providing uniform cooling of the carcass. It demonstrated could prospects for industrial use, which opens up new opportunities for further research and freezing process optimization.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>Turkey farming and meat processing are fast-developing areas of the Russian food industry. However, their development requires more advanced methods of meat storage and freezing. Traditional methods of air cooling often fail to preserve the original meat texture and nutritional value. This paper introduces a new refrigeration unit with CO2 as a refrigerant. CO2 snow and gas come in direct contact with turkey carcasses, thus accelerating the cooling process and improving the meat quality. CO2 recirculation makes the refrigeration unit an economical solution to environmental issues. The refrigeration unit included a conveyor system, a vacuum chamber, and a CO2 circulation system.&#13;
The research featured grade 1 turkey carcasses of 2.7 ± 0.1 kg frozen at different temperatures (–30, –50, and –70°C) and CO2 flux rates (0–5 m/s). The share of CO2 in the gas mix was ≥ 50%. The temperature and heat flux density were measured using thermocouples and heat flux probes.&#13;
As the temperature dropped from –30 to –70°C, the freezing time decreased from 48 to 33 min and to 29 min when the experiment involved enforced convection. The amount of CO2 consumed increased from 7.5 to 13.5 kg without convection and from 6.5 to 12.0 kg with enforced convection. Compared to traditional methods, CO2 provided uniform freezing and reduced mechanical damage to the meat structure.&#13;
The newly developed refrigeration unit with recirculated CO2 demonstrated high efficiency in freezing turkey meat while reducing CO2 consumption and providing uniform cooling of the carcass. It demonstrated could prospects for industrial use, which opens up new opportunities for further research and freezing process optimization.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>Refrigeration</kwd>
    <kwd>CO2 recirculation</kwd>
    <kwd>quick freezing</kwd>
    <kwd>convection</kwd>
    <kwd>turkey meat</kwd>
    <kwd>meat processing</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>Refrigeration</kwd>
    <kwd>CO2 recirculation</kwd>
    <kwd>quick freezing</kwd>
    <kwd>convection</kwd>
    <kwd>turkey meat</kwd>
    <kwd>meat processing</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">The research was part of a comprehensive scientific innovative program initiated by Russian Federation Government Decree No. 1144-r, May 11, 2022: Developing and implementing new technologies in the E&amp;P of solid minerals, industrial safety, bioremediation, and product development of deep coal processing: A consistent reduction of environmental impact and hazards (Agreement No. 075-15-2022-1201, September 30, 2022).</funding-statement>
    <funding-statement xml:lang="en">The research was part of a comprehensive scientific innovative program initiated by Russian Federation Government Decree No. 1144-r, May 11, 2022: Developing and implementing new technologies in the E&amp;P of solid minerals, industrial safety, bioremediation, and product development of deep coal processing: A consistent reduction of environmental impact and hazards (Agreement No. 075-15-2022-1201, September 30, 2022).</funding-statement>
   </funding-group>
  </article-meta>
 </front>
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