Benchmarking and Potential of Heat Pumps for Flue Gas Condensation

Year 2019, Volume: 22 Issue: 3, 168 - 175, 01.09.2019

Wolf Gereon Wedel Annelies Vandersickel Hartmut Spliethoff

https://doi.org/10.5541/ijot.499527

Abstract

The use of environmental or waste
heat with heat pumps, open absorption cycles or sorption heat pumps is an
option for low carbon or high efficiency heat supply for industrial use. For one
of the mentioned technologies to experience wide spread use it must offer
economic advantages compared to other technologies. The evaluation of the
economic viability is strongly dependent on boundary conditions.

This work presents a method for the
comparison of available technologies with regard to economics and potential for
exhaust heat use. Calculations comparing the effects of different exhaust gas
compositions resulting from technology specific air ratios for combustion in
combination with different return and process heat temperatures are performed
in order to quantify the potential of condensing technology. The herein developed
specific annuity difference method allows evaluating the impact of improving
technology specific parameters, such as temperature spread and coefficient of
performance (COP), enabling to identify future research needs and to benchmark
the technologies with e.g. a gas heater. The risk posed by uncertain future
developments, such as gas price development and increasing prices for carbon
emissions, possible taxation of these and emission trading, influences the economic
evaluation and can motivate investment in active condensing technology, even if
economic viability under current circumstances is not given.

Keywords

condensing technology, energy efficiency, heat pump, waste heat

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