Air-to-water heat pump assessment: Part 2 – Exergetic and exergoeconomic analyses

M. Zlateva,T. Totev,Daniela Chakyrova,A. Terziev,K. Filipov,R. Atanasova,Nadezhda Doseva,I. Dukov,A.H. Wierling,I. Nastase

doi:10.1051/e3sconf/202132701010

Abstract

This study is part 2 of the investigation on the exergetic and exergoeconomic parameters of an existing system with an air-to-water heat pump unit as a heat source. Part 1 presents the used experimental setup. The main aim of the conducted experimental tests is to develop models of produced heat rate and energetic COP at different ambient conditions. The obtained data is used in Part 2 of the study where the exergetinc and exergoeconomic assessment is carried out. The exergetic and exergoeconomic analysis was performed at dynamically changing ambient parameters. The considered operation modes of the air-to-water heat pump (AWHP) unit and backup heater (BUH) were evaluated based on Seasonal Exergetic Efficiency. For the exergoeconomic analysis, the SPECO method is used. Thus, this paper provides an exhaustive understanding of the exergy and exergoeconomic performance of the considered air-to-water heat pump system.

Highlights

To perform an objective thermo-economical assessment of an energy conversion system, for example, in addition to the quantity of the energy flows, it is necessary to consider and their quality
The main reason for such an approach to the problem lies in the fundamental consequence from the Second Law of Thermodynamics: the different energy forms do not have the same value; they differ in the part that can be converted into another energy form able to do work
According to the concept of seasonal exergetic efficiency expressed by equation (4), the considered operation modes of the backup heater (BUH) and the air to water heat pump (AWHP) were evaluated

Summary

Introduction

To perform an objective thermo-economical assessment of an energy conversion system, for example, in addition to the quantity of the energy flows, it is necessary to consider and their quality. The main goal in the design and operation of heating systems should be achieving the maximum exergy content of the product of the analyzed system. In the case of the air to water heat pump (AWHP) system, the higher energy content of the product suggests а higher exergy cost of heating. It is necessary to use a method that involves a comprehensive evaluation accounting for the quantities of energy, exergy, and monetary cost. Such an approach is an exergoeconomic method for assessment

Objectives

Methods

Results

Conclusion