RATIONAL HEAT RECOVERY TECHNOLOGIES OF VENTILATION SYSTEMS FOR HEATING BUILDING SYSTEMS
Analytically analyzed and substantiated rational technologies for efficient utilization of heat energy of the ventilation system for hot water supply of the building during the cold period. The first technology provides for the use of a heat pump and a heat accumulator, and the second technology - a two-stage plate recuperator with a guarantee of non-freezing of heat exchange surfaces in both cases. Using the developed methodology for calculating the parameters of the ventilation system, it was determined that the use of a scheme with a heat pump and a heat accumulator would reduce the consumption of equivalent fuel by half compared to using a gas water heater at the same facility. A technology has also been developed that makes it possible to determine the rational area of a plate recuperator in the ventilation system of a building, provided that the heat exchange surfaces are free from frost without using additional energy resources in the heating system. The proposed technology considers the use of a two-stage scheme, in which the recuperator consists of two sections. In the case when the outside air temperature is higher than the critical one, then both sections work sequentially, which provides a rational heat exchange area, and, accordingly, a rational value of the recuperation coefficient. If the outside air temperature becomes below the critical one, then one of the sections is turned off, reducing the heat exchange area of the recuperator to the required value. This value of the heat exchange area is determined based on the condition of non-negativity of the temperature of air leaving the environment. The developed technology of heat recovery from the ventilation system using a two-stage recuperator ensures its reliable and continuous operation without freezing of heat exchange surfaces and with rational values of the recuperation coefficient (from 80 % higher), which guarantees a combination of energy efficiency and compact design. Having analyzed the features of the heat recovery technology using a heat pump and a heat accumulator in the cold season, as well as using an air conditioner and a heat accumulator in the warm season, we can say about the justified need to create a unified year-round heat recovery technology for a hot water supply system using a heat pump and heat accumulator.
Vincenzo Bianco, Federico Scarpa, Luca A. Tagliafico. Estimation of primary energy savings by using heat pumps for heating purposes in the residential sector. Applied Thermal Engineering. 2017. Vol. 114. P. 938-947. URL: https://doi.org/10.1016/j.applthermaleng.2016.12.058.
Олишевский Г. С., Олишевский И. Г. Обоснование рациональной технологии утилизации теплоты системы кондиционирования для горячего водоснабжения. Вісник Дніпропетровського університету. Серія: Ракетно-космічна техніка. 2019. № 4. Т. 27. вип. 22. С. 35–41. URL: http://rocketspace.dp.ua/index.php/rst/issue/view/1/7.
Разумний Ю. Т., Заїка В. Т., Степаненко Ю. В. Енергозбереження: навч. посіб. Дніпропетровськ: Издательство Нац. гірн. ун-ту, 2005. 166 с.