Gateway for:

Member Countries

New Class of Refrigerator Technology


Elaboration of New Class of Energy Saving Domestic Refrigerating Equipment (project HOLT)

Tech Area / Field

  • NNE-HCS/Heating and Cooling Systems/Non-Nuclear Energy

3 Approved without Funding

Registration date

Leading Institute
Machine-Building Research Institute, Russia, Moscow

Supporting institutes

  • Russian Academy of Missile and Artillery Sciences, Russia, Moscow\nMedicom, Russia, Moscow reg., Korolev\nAssociation "Kholod-byt", Russia, Moscow

Project summary

On the eve of the century to come the problem of energy saving becomes more acute. Domestic refrigerators are among the most abundant energy-using appliances consuming over 200 bln.kWh/year. On the initiative of the team of researchers and specialists from the Machine-Building Research Institute (NIMI) the task to substantially reduce the “appetite” of such equipment has been outlined. They are elaborating a new class of domestic refrigerating equipment, based on utilization of natural thermal energy, that has come to be known as HOLT.

The analysis of future development of domestic refrigerators has shown that substantial reduction in energy consumption by the most advanced vapor-compression type refrigerators as the result of improvement of a refrigerating machine, temperature control system, application of new materials and technologies is not to be expected. At the same time, another approach to solving the said problem does not attract attention of specialists in this field. Here, we have to do with a method prompted by the Nature itself, i.e. the utilization of natural thermal energy in equipment used to store foodstuffs.

Analysis of meteostatistical data on average annual temperatures, their seasonal and daily variations on the Earth surface shows that almost one third of land is characterized by moderate climatic conditions with average annual temperatures varying from –5 °C to +12 °C. As the result of comparison of these data with the indoor temperatures (16…32 °C) which guarantee the operation of domestic refrigerators the following can be seen: the range of air temperatures in zones with moderate climatic conditions is significantly more close to food storage conditions maintained in the refrigerator food-storage compartment (1…8 °C) as compared with the indoor temperature range. Since energy consumed by the refrigerator, in the first turn, is determined by the difference between the outdoor temperature and such set inside the refrigerator food-storage compartment, then it is obvious that the refrigerator power consumption can be substantially reduced by simply placing it, fully or partially, in the open air.

Calculations conducted have shown that nearly 80% energy consumed by refrigerators can be saved using this method. The above-mentioned approach to elaboration of a new class of domestic refrigerating equipment has been treated as a novel climatological concept, and the appliance itself has been named “a refrigerator-warmer” (HOLT).

Currently, the ideology of HOLTs layouts and the climatological concept have been provisionally elaborated, alongside with the development of the HOLT prototypes (window and balcony mounted versions). The results of the experiments involving the prototypes revealed that they fairly match with design data.

Thus, the research conducted has testified that radical settlement of energy-saving problems based on climatological concept to be used for implementation of the a.m. basic research is possible. The said scientific research is of a novel character as is seen from publications and patents of the Russian Federation as well as from materials being prepared to be patented abroad. A window-mounted version of the HOLT prototype has been displayed at exhibitions and won various prizes (International Inventions Exhibition, Brussels, - the Gold medal; All-Russia Exhibition Center, RF, Moscow, - the Gold medal, etc.). The scientific research conducted forms a basis for the offered project aimed at elaboration of a new generation of refrigerating equipment.

In the course of scientific research the authors revealed the additional important aspects of the HOLTs theory application that are as valuable as the energy saving, namely: the products versatility and the possibility for clearing of ecological problems.


The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.


ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

Promotional Material

Значимы проект

See ISTC's new Promotional video view