DOI: https://doi.org/10.20535/1810-0546.2018.6.151561

Efficiency of a Heat Pump Recuperative Heating and Ventilation System with Use of Heat of Ventilation and Atmospheric Air

Michail K. Bezrodny, Tymofii O. Misiura

Abstract


Background. Modern technological progress of mankind leads to an increase in demand for energy whether it is heat or electricity. Most of this energy is obtained by burning minerals, which reserves are rapidly decreasing. Energy saving in all sectors of the economy is a global problem of our time.

Objective. The search for effective ways to reduce the energy capacity of heat and power equipment is a pressing issue. One of such ways is the use of alternative low-potential energy sources such as air heat pumps, which are widely used due to low capital investments compared to other energy sources, unlimited and affordable heat source. However, their significant disadvantage is the loss of power and efficiency with a decrease in air temperature. The aim of the study is to find a solution to this drawback.

Methods. The article describes a method for analysing the effectiveness of a heat pump recuperative heating and ventilation system with use of heat of ventilation and atmospheric air. A theoretical model of this system has been designed, and a numerical analysis of its thermodynamic efficiency has been performed.

Results. It is seen that the use of this system allows reducing the total relative costs of external energy for heating and ventilation as compared to the system without using ventilation air at any values of the recovery coefficient and relative heat flow for ventilation. Graphic dependencies for unknown parameters at system nodes were obtained. Ratios for determining the total unit cost of external energy in the scheme under study are obtained.

Conclusions. It was determined that when using this system at the design stage of the heat pump heating and ventilation system, it is possible to significantly reduce capital and operating costs. The use of the obtained dependencies in the development of heat pump heating and ventilation systems will ensure maximum energy efficiency of their work.

Keywords


Heat pump recuperative heating and ventilation system; Air heat pump; Total specific costs of external energy

References


P.P. Kudelia, Low-Exergy Heating Systems. Kyiv, Ukraine: NTUU KPI, 2015, 153 p.

V.F. Gershkovich, Features of the Design of Heating Systems of Buildings with Heat Pumps. Kyiv, Ukraine: Ukrainian Academy of Architecture “Energominimum”, 2009, 60 p.

Y.Y. Hsieh et al., “A study of heat-pump fresh air exchanger”, Appl. Thermal Eng., vol. 132, no. 5, pp. 708–718, 2018. doi: 10.1016/j.applthermaleng.2017.12.122

M.K. Bezrodny, Thermodynamic and Energy Efficiency of Heat Pump Heat Supply Circuits. Kyiv, Ukraine: NTUU KPI, 2016, 272 p.

E.P. Shubin, The Main Issues of Cities' Heating Systems Designing. Moscow, SU: Jenergija, 1979, 359 p.

T.V. Morozjuk, The Theory of Chillers and Heat Pumps. Odesa: Negociant, 2006, 712 p.

F.R. Steward, “Optimum arrangement and use of heat pumps in recovery waste heat”, Energy Conversion Mgmt., vol. 24, no. 2, pp. 123–129, 1984.

Mitsubishi Electric Official Website [Online]. Available: http://mitsubishielectric.com.ua/


GOST Style Citations








Copyright (c) 2018 Igor Sikorsky Kyiv Polytechnic Institute

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.