TY - JOUR
T1 - On the development of high temperature ammonia-water hybrid absorption-compression heat pumps
AU - Jensen, Jonas Kjær
AU - Markussen, Wiebke Brix
AU - Reinholdt, Lars
AU - Elmegaard, Brian
PY - 2015
Y1 - 2015
N2 - Ammonia-water hybrid absorption-compression heat pumps (HACHP) are a promising technology for development of ecient
high temperature industrial heat pumps. Using 28 bar components HACHPs up to 100 °C are commercially available. Components
developed for 50 bar and 140 bar show that these pressure limits may be possible to exceed if needed for actual applications. Feasible
heat supply temperatures using these component limits are investigated. A feasible solution is defined as one that satisfies constraints
on the COP, low and high pressure, compressor discharge temperature, vapour water content and volumetric heat capacity. The
ammonia mass fraction and the liquid circulation ratio both influence these constraining parameters. The paper investigates feasible
combinations of these parameters through the use of a numerical model. 28 bar components allow temperatures up to 111 °C, 50
bar up to 129°C, and 140 bar up to 147 °C. If the compressor discharge temperature limit is increased to 250 °C and the vapour
water content constraint is removed, this becomes: 182 °C, 193 °C and 223 °C.
AB - Ammonia-water hybrid absorption-compression heat pumps (HACHP) are a promising technology for development of ecient
high temperature industrial heat pumps. Using 28 bar components HACHPs up to 100 °C are commercially available. Components
developed for 50 bar and 140 bar show that these pressure limits may be possible to exceed if needed for actual applications. Feasible
heat supply temperatures using these component limits are investigated. A feasible solution is defined as one that satisfies constraints
on the COP, low and high pressure, compressor discharge temperature, vapour water content and volumetric heat capacity. The
ammonia mass fraction and the liquid circulation ratio both influence these constraining parameters. The paper investigates feasible
combinations of these parameters through the use of a numerical model. 28 bar components allow temperatures up to 111 °C, 50
bar up to 129°C, and 140 bar up to 147 °C. If the compressor discharge temperature limit is increased to 250 °C and the vapour
water content constraint is removed, this becomes: 182 °C, 193 °C and 223 °C.
KW - High temperature heat pump
KW - Industrial heat pump
KW - Absorption-compression
KW - Ammonia-water
U2 - 10.1016/j.ijrefrig.2015.06.006
DO - 10.1016/j.ijrefrig.2015.06.006
M3 - Journal article
VL - 58
SP - 79
EP - 89
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
SN - 0140-7007
ER -