Application of heat pumps in the heating and hot water supply systems on the example of the city of lutsk
Abstract
In the work, an analytical study and technical and economic calculations of the use of an air-to-water heat pump in the heating and hot water supply system of a designed 9-story residential building in Lutsk, whose annual need for heat energy for heating and hot water supply is 1110417 kW or 955 Gсal.
Reasoned application of the "air-water" heat pump, as well as a comparison with other sources of heat supply. Taking into account the current tariffs, the annual costs for heating and hot water supply of a 9-story residential building in the city of Lutsk using different heat supply systems were obtained: the use of electric boilers will lead to the highest costs - UAH 1636.4 thousand, the costs will be slightly lower when using central heat supply - 1344.9 thousand UAH, gas boilers give costs of 1218.7 thousand UAH, and heat pumps give the lowest costs - only 555.2 thousand UAH.
The work studied the possibility of using solar collectors. The city of Lutsk is located on the territory where the intensity of solar radiation is 1000 kWh/m²·year. This geographical location of a 9-story residential building makes it possible to only partially use solar energy for heating and hot water supply. 60 solar collectors can be installed on the roof of the designed residential building, which will make it possible to obtain 133950 kW (115.2) Gcal of thermal energy per year, i.e., cover 12% of annual thermal energy needs.
By using a system of solar collectors in combination with other heat supply systems, it is possible to significantly optimize costs for heating and hot water supply. Thus, based on the comparative analysis, we can see that the most cost-effective system for the heating and hot water supply of a 9-story residential building in the city of Lutsk is a system consisting of thermal energy from an air-to-water heat pump in combination with a system of solar collectors. It should also be noted that in the spring-summer period when the most intense solar radiation is observed, the system of solar collectors will be able to provide approximately 95% of the thermal energy needs of a 9-story residential building in the city of Lutsk for hot water supply. In the same spring-summer period, the energy from the system with heat pumps of the "air-water" type can be used by the fan coil system for air conditioning needs.
Taking into account the advantages of using energy from heat pumps and solar collectors for the needs of heating systems and hot water supply, this principle was the basis of real projects implemented in the Volyn and Kherson regions of Ukraine.
