Conditions for Energy Efficient Heat Supply Based on the Transformed Heat of Soil and Air Flows

Abstract

Based on the analysis of thermohydraulic processes and the structural and functional structure of the proposed system of heat and cold supply of buildings, a multifactorial dependence of the actual conversion coefficient was established to assess the efficiency of transformation of the heat taken from the soil massif and ventilation air. It allows modeling the individual influence of the initial parameters and operational modes of the system in the search for rational conditions for the highly efficient use of energy flows for heat and cooling supply of buildings during the corresponding periods of the year. The results of a qualitative assessment of the multifactorial interrelation of the actual conversion coefficient substantiated the possibility of energy efficient operation of the analyzed system, which is provided under the design conditions of the heating period when the ratio of circulating flow rate through the evaporator and condenser of heat pump is higher than 1.8, which is rational for sports, recreation, shopping and entertainment complexes. The improved structural and functional arrangement of the system based on a binary low-temperature source increases the efficiency of vapor compression transformation of energy flows, indirectly confirming the advisability of maximizing the use of the energy potential of ventilation air during the year with a corresponding accumulation of excess heat in the soil mass, and, consequently, the possibility of reducing the depth of expensive wells or the number of probe heat exchangers.