TY - JOUR

T1 - Résultats expérimentaux d'une pompe à chaleur à absorption-compression utilisant le fluide de travail ammoniac/eau pour la récupération de chaleur dans des processus industriels

AU - Markmann, Benjamin

AU - Tokan, Taylan

AU - Loth, Maximilian

AU - Stegmann, Jan

AU - Hartmann, K.-H.

AU - Kruse, H.

AU - Kabelac, Stephan

N1 - Funding Information: The data and insights of this work were found in cooperation with STEFFEN HARTMANN RECYCLINGTECHNOLOGIEN GMBH and the Forschungszentrum für Kältetechnik und Wärmepumpen GmbH within a project funded by the German Federal Ministry for Economic Affairs and Energy represented by the Projektträger Jülich.

PY - 2019/3

Y1 - 2019/3

N2 - The full potential of hybrid absorption-compression heat pumps, which can cover heating demands at temperatures of around 100 °C and provide additional cooling in industrial processes, has yet to be exploited. Although research has also been conducted on alternative systems, the natural working pair NH 3 and H 2 O still has numerous advantages, being a very economic and thermodynamically well-suited refrigerant for this application. Striving for the development of a heat pump system that can cover a large range of heating demands at a temperature of about 80 °C and create useful cooling power in industrial processes, a test rig was designed and built at the Institute for Thermodynamics at the Leibniz University in Hanover. According to the targeted heating power of 50 kW, the components of the system are chosen based on a simulation model that solves mass, energy and component-specific balance equations for each of the parts simultaneously. This simulation is later used to compare and evaluate experimental data. Constant parameters are water-inlet temperatures at the heat source of 59 °C and at the heat sink of 50 °C. Depending on the mass flow of ammonia-poor solution and the condensation pressure, the heating capacity and the COP of the test rig are investigated. The range of the poor solution mass flow is from 0.21 kg/s to 0.31 kg/s, while the absorption pressure is varied between 13.5 bar and 16.5 bar. The COP of heating reaches a maximum of 2.5, providing more than 40 kW of heating power at a maximum internal temperature lift of 43 K.

AB - The full potential of hybrid absorption-compression heat pumps, which can cover heating demands at temperatures of around 100 °C and provide additional cooling in industrial processes, has yet to be exploited. Although research has also been conducted on alternative systems, the natural working pair NH 3 and H 2 O still has numerous advantages, being a very economic and thermodynamically well-suited refrigerant for this application. Striving for the development of a heat pump system that can cover a large range of heating demands at a temperature of about 80 °C and create useful cooling power in industrial processes, a test rig was designed and built at the Institute for Thermodynamics at the Leibniz University in Hanover. According to the targeted heating power of 50 kW, the components of the system are chosen based on a simulation model that solves mass, energy and component-specific balance equations for each of the parts simultaneously. This simulation is later used to compare and evaluate experimental data. Constant parameters are water-inlet temperatures at the heat source of 59 °C and at the heat sink of 50 °C. Depending on the mass flow of ammonia-poor solution and the condensation pressure, the heating capacity and the COP of the test rig are investigated. The range of the poor solution mass flow is from 0.21 kg/s to 0.31 kg/s, while the absorption pressure is varied between 13.5 bar and 16.5 bar. The COP of heating reaches a maximum of 2.5, providing more than 40 kW of heating power at a maximum internal temperature lift of 43 K.

KW - Absorption-compression heat pump

KW - High temperature heat pump

KW - Industrial heat pump

KW - Layout and experimental results

KW - Natural refrigerant

KW - Waste heat recovery

UR - http://www.scopus.com/inward/record.url?scp=85060676870&partnerID=8YFLogxK

U2 - 10.1016/j.ijrefrig.2018.10.010

DO - 10.1016/j.ijrefrig.2018.10.010

M3 - Article

AN - SCOPUS:85060676870

VL - 99

SP - 59

EP - 68

JO - International Journal of Refrigeration

JF - International Journal of Refrigeration

SN - 0140-7007

ER -