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ABSTRACT OF THESIS

qualifying work for master's degree

The investigation of the autonomous radiant heating systems based on infra-red emitters with the purpose of development of recommendations on the increase of their energy effective

Actuality

Due to the necessity of diminishing of expensive fuel (natural gas) at space heating in industry in a prospect it is very really 50% heat-requirement  to provide by the radiant heating, and 50% - by the convective  heating. Other source of energy economy is application of the radiant heating which will be a more economy to satisfy a requirement in a warmth for workplaces at the use almost on 25% less of heat-repository, therefore the detailed consideration of this question from the technical point of view is very actually.

Aims and tasks

The purpose of work is development of recommendations on introduction and effective use of infra-red emitters in the systems of heating of production and dwellings apartments.

For achievement of the put purpose it is assumed to decide the followings tasks:

  • creation of valuable method of engineering heating-engineering calculation of the systems of heating on the base of infra-red heaters;
  • development of mathematical model of functioning of the system of the radiant heating;
  • leadingout of characteristic dependences between physical sizes, determining the level of power effective of application of these systems.

Scientific novelty

The supposed scientific novelty of work consists in the following:

1) suggestion of methodological approach of  lead through of engineering heating engineering calculation of the systems of heating on a base IK heaters;

2)  first on the basis of the indicated approach it is assumed to formulate a task upon settlement of heat-wastes of apartment on the basis of equalizations of thermal balance of non-load-bearing constructions in stationary temperature terms;

3) during the analysis of results of numeral decision of the systems of equalizations of thermal balance it is assumed to get information both about distributing of temperature and heat-wastes of  buildings and about theoretical heat emission of heatings screens on a theoretical model.

Review of research-and-developments on the topic

The employees of department of industrial heating energy and energetical management  Center are engaged in the problems of the radiant heating in DONNTU.

In Ukraine and in works of many scientists are the world  devoted research of different theoretical and practical aspects of the radiant heating. It was engaged in research of the system of the panel-radiant heating by L. Bankhidi, A. Shapovalov, P. Kutateladze, M. Kissin. Experience of the practical use of mathematical approaches  was largely based on developments of Tanicheva V., Zakrzhevskogo V.I.,  Nuorkivi A. etc.

Own researches: current and planned results

Theoretical and methodological basis of research is made by works of native  and foreign scientists in area of energy supply of dwellings and industrial buildings and effective use of power resources, including the questions of energy-savings and application of alternative energy sources.

The informative base of research is made by statistical information about the use of different types of power resources in Ukraine and abroad, operating normative documents in the field of energy.

At the discussion of decision about the use of  IK-radiators, and also it is necessary to take into account in calculations, that:

1) options of the radiant heating the more advantageous, than the higher heated apartment (for apartments with N>6m economic advantages of the radiant heating are indisputable; for apartments with N=10m, heated IK-heating, the expense of warmth makes about 50 % expense of warmth in the variant of the convectiv heating).

Table 1 - Specific expenses on heating of building a volume 100 m3 and  in 8 metres  high

Specific expenses

IR-heating

Central heating

Hourly average expense of warmth, ccal

338

1337

The maximum expense of warmth, ccal

731

2872

The average expense of gas,
m3/h

0,042

0,168

2) a temperature of air in an apartment can be on a few degrees below, than at the convectiv heating (at the convectiv heating feeling of thermal comfort is created at the temperature of air of 20-22°C, the temperature of 15-18°C fully suffices at the radiant heating), and it entails the economy of energy in size of 30-40%;

3) advantages of emitters show up to a full degree, when factor of heat conductivity of construction of  buildings:

K ≥ 1,16 Vt/(m2·°C)

4)Determination of losses of thermal energy on infiltration of outward air both at the convectiv and at infra-red heating it is necessary to conduct taking into account multipleness of ventilation in the heated apartment:

Qu= 0,337·F·h·(tВ-tН)·K, Vt ,

where F is a room measure, m2; h-high of apartment, m; tВ is an internal temperature in an apartment, °C ;  tН is an outward calculation temperature, °C;  K   is multipleness of ventilation in the heated apartment.

In an order to enter a customer in an error, often the multipleness of ventilation is consciously understated by infiltration, which allows to hide enhanceable heat-wastes, related to the process of natural ventilation.

As a result of own researches an author is set that options of the radiant heating the more advantageous, than the higher heated apartment (for apartments with the height of ceiling of N>6m economic advantages of the radiant heating are indisputable; for apartments with N=10m, heated IK-defroster, the expense of warmth is made by an about 50% expense of warmth in the variant of the convectiv heating).

As a result of research work it is planned to collect and study materials on questions, to related to the theme of master's degree work: to consider the questions of caloradiance, mechanisms of influence of infra-red rays on the organism of man depending on length of the waves selected an emitter, intensity of radiation; also development and making of experimental fluidizer goes receipt of own results in this area.

Conclusions

Thus, the modern systems of the autonomous radiant heating require more detailed study. Further research is required also yet some aspects of their application, for example, information about multipleness of ventilation by infiltration at the radiant heating as compared to heat-air the analysis of which will allow to define the real information about heat-waste, related to the process of natural ventilation.

List of literature

  1. Rabyash R. Sistems of heating apartment  in aspekt of  thermal a comfort that technologіcal demands // Rinok  - 1997.- ‘ 6.- P. 5-8.
  2. Skanavi. A.I. Heating.- M.: Stroyizdat, 1988.- 416 p.
  3. To recommendation on planning, device and exploitation of the systems of the panel-radiant heating and heating of chaffs of 1th floors by warming elektro-сabеl.- Krasnoyarsk.: Promstroyproekt, 1971.- 56 p.
  4. Olesen B.w. Theory and practical worker of the floor radiant heating // AVOK.- 2002.- “ 1.- P. 44-50.
  5. Machkashi And., Bankhidi L. Radiant heating / Trudged. with veng. In. M. of Belyaeva; Under red. In. N. Bogoslovskogo  l. M. of Makhova. - M.: Stroiizdat, 1985.- 464 with, silt.- Translation of izd.: Sugarzo futesek/ A. Macskasy, L. Banhidi.
  6. http://energetika.com.ru/
  7. Shorin S.I. Heat-transfer by a radiation  at the radiant heating. In sb.: Modern questions of heating and ventilation. M., 1999.
  8. Pyatyshkin G.G., Shklyar V.S. Diminishing of unevenness of the field of temperatures in a sheet at heating his radiation // Technology and quality of glass: Tez. rep. internat. science.-techn. konf., 12-21 Oct. 1993.- Konstantinovka, 1993.- S.39.

Remark

At writing of this abstract master's degree work is not yet completed. Final completion is  December, 2010. The complete text of work and materials can got for an author or his leader after the indicated date.

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