Comparative Analysis of Heat Pump System with IHX Using R1234yf and R134a

Abstract

This research presents an energy performance analysis of the heat pump system with internal heat exchanger (IHX). The mathematical model of the heat pump outlined in this paper has been created by the author, it is steady-state with lumped parameters. The experimental validation of the model has been carried out using R1234yf and R134a as refrigerant. The aim of this work is to compare the energy performance in a wide range of operating conditions of a monitored heat pump system using both refrigerants. Finally, the heating capacity for R1234yf was lower from 0.63 % to 7.54 % compared with R134a, while the compressor power was similar from 0.12 % to 3.51 %. The COP values of R1234yf were lower than those obtained of R134a, ranging from 1.39 % to 4.22 %.

Investigation of the Thermodynamic Characteristics of the Ester Oil and R152a, R125, R134a and R123 Refrigerant Mixtures

“…The characteristic terms of the equation [1] can be primed, related to each other, using ratios. It is useful to turn the equation [1] into a dimensionless form.…”

“…The characteristic terms of the equation [1] can be primed, related to each other, using ratios. It is useful to turn the equation [1] into a dimensionless form. In order to formulate the hydrodynamic similarity criteria, the force of inertia is used as a reference value.…”

“…The modelling of the heat pumps is based on decades of experience as both of stationary [1], [2] and the non-stationary [3], [4] mathematical models. The mathematical models are fraught with a numerous omissions and uncertainties.…”

Extending the Validity of Basic Equations for One-dimensional Flow in Tubes with Distributed Mass Sources and Varying Cross Sections

“…in the further development Fig. 1 Reaction force on the lateral surface of the transpired solar collector's mathematical modeling, described by Fawaier et al [8] Distributed mass flow source has also been described by Sánta [9] during the energy analysis of heat pump systems with different refrigerants. Therefore, the balance of momentum is as follows:…”

Kinematic and Dynamic Modeling of the Rotary Harrow

“…Dynamic models can be used to study the dynamic behaviour [12] and the energy demand [13] of a work tool. In the present paper we perform kinematic and dynamic modelling of the rotary harrow teeth.…”