Abstract
Heating of large-cubage buildings accounts for significant share of energy consumption. The radiant heating system using gas heaters is a common solution for large-cubage halls and is considered to be energy efficient. There is a possibility of additional heat energy recovery from the flue gases of gas radiant heaters because new solutions were introduced to the market. Furthermore heat recovery consists the most promising solution and develop during the recent years rapidly. On the other hand, few works have been dedicated to heat recovery from exhaust gas but none of them consider exhaust gas from radiant heaters. Exhaust gas temperature depends on the type and efficiency of the gas heater. The selection of both the type of radiant heaters and the heat recovery system requires many factors to be taken into account. This study consider possibilities for application of different heat exchangers in exhaust gases system of gas radiant heaters. The authors propose to classify exhaust gas heat recovery systems in dependence on intermediary medium: water/air, gas heaters type: ceramic/tube and number (single/group) and their mounting location.
Highlights
Non-residential buildings are intensive consumers of heat energy need for various purposes: heating, hot water preparation, ventilation, cooling, lighting (32%), and electric devices (24%) [1]
It is possible to solve the system in two different methods [6, 16]: 1 – internal circulating air is supplied to the exchanger; with a concentric chimney external air is supplied to the heater for gas combustion and flue gases are discharged; in this case one hole for each heater is made in the roof oh hall; 2 – with a concentric chimney external air is supplied to the heat exchanger and flue gases are discharged; with a separate duct, external air is supplied to the burner of the heater for gas combustion; in the roof two holes are made for each heater
The choice of a solution should consider the possibility of heat recovery because exhaust gas heat recovery can highly reduce the energy consumption as well as pollution level
Summary
Non-residential buildings are intensive consumers of heat energy need for various purposes: heating, hot water preparation, ventilation, cooling (totally 37%), lighting (32%), and electric devices (24%) [1]. High investment and operating costs in large-size buildings make the business sector more and more demanding with regard to the construction and maintenance of the facilities. The presented study aims at addressing the following aspects: (1) determination of the maximum allowable primary energy demand in the large-cubage buildings on the basis of regulatory requirements, (2) discussion of methods of heating large-cubage halls with particular consideration of gas heaters and their parameters, (3) discussion, comparison and classification of flue gas heat recovery systems for radiant heaters
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