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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

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Front. Energy    2017, Vol. 11 Issue (4) : 503-509    https://doi.org/10.1007/s11708-017-0515-1
RESEARCH ARTICLE
Numerical study of a hybrid absorption-compression high temperature heat pump for industrial waste heat recovery
Zhiwei MA, Huashan BAO(), Anthony Paul ROSKILLY
Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
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Abstract

The present paper aims at exploring a hybrid absorption-compression heat pump (HAC-HP) to upgrade and recover the industrial waste heat in the temperature range of 60°C–120°C. The new HAC-HP system proposed has a condenser, an evaporator, and one more solution pump, compared to the conventional HAC-HP system, to allow flexible utilization of energy sources of electricity and waste heat. In the system proposed, the pressure of ammonia-water vapor desorbed in the generator can be elevated by two routes; one is via the compression of compressor while the other is via the condenser, the solution pump, and the evaporator. The results show that more ammonia-water vapor flowing through the compressor leads to a substantial higher energy efficiency due to the higher quality of electricity, however, only a slight change on the system exergy efficiency is noticed. The temperature lift increases with the increasing system recirculation flow ratio, however, the system energy and exergy efficiencies drop towards zero. The suitable operation ranges of HAC-HP are recommended for the waste heat at 60°C, 80°C, 100°C, and 120°C. The recirculation flow ratio should be lower than 9, 6, 5, and 4 respectively for these waste heat, while the temperature lifts are in the range of 9.8°C–27.7 °C, 14.9°C–44.1 °C, 24.4°C–64.1°C, and 40.7°C–85.7°C, respectively, and the system energy efficiency are 0.35–0.93, 0.32–0.90, 0.25–0.85, and 0.14–0.76.
Keywords absorption compression      high temperature heat pump      efficiency      industrial waste heat      thermodynamic analysis     
Corresponding Author(s): Huashan BAO   
Just Accepted Date: 30 October 2017   Online First Date: 22 November 2017    Issue Date: 14 December 2017
 Cite this article:   
Zhiwei MA,Huashan BAO,AnthonyPaul ROSKILLY. Numerical study of a hybrid absorption-compression high temperature heat pump for industrial waste heat recovery[J]. Front. Energy, 2017, 11(4): 503-509.
 URL:  
https://academic.hep.com.cn/fie/EN/10.1007/s11708-017-0515-1
https://academic.hep.com.cn/fie/EN/Y2017/V11/I4/503
Fig.1  Schematic diagram of hybridabsorption-compression heat pump
Fig.2  Determination of the poleof rectification
Parameter Value
Twas/°C 60–120
FR 1–20*
Rref 0–1
Rrefl 2
hpump1, hpump2 0.85
hcom 0.75
UA/(W·K−1) 1000
wref 0.9995
?ref /(kg·s−1) 0.01
Tab.1  Parameters usedin the calculation
Fig.3  Thermodynamic states of theworking fluid at different points at Twas = 80°C and FR= 7
Fig.4  Energy efficiency of HAC-HPat a waste heat temperature of 80°C
Fig.5  Exergy efficiency of HAC-HPat a waste heat temperature of 80°C
Fig.6  Useful heat of HAC-HP ata waste heat temperature of 80°C
Fig.7  Input heat and electricitypower at a waste heat temperature of 80°C
Fig.8  Energy vs temperature liftof HAC-HP at waste heat temperatures of 60°C–120°C
Waste heat temperature/°C Recommended FR Energy efficiency Exergy efficiency Useful heat/kW Temperature lift/°C
60 <9 0.35–0.93 0.55–0.67 7.2–11.7 9.8–27.7
80 <6 0.32–0.90 0.50–0.61 7.3–11.9 14.9–44.1
100 <5 0.25–0.85 0.37–0.56 5.7–11.9 24.4–64.1
120 <4 0.14–0.76 0.21–0.50 3.5–11.2 40.7–85.7
Tab.2  Recommended FR and corresponding performance of HAC-HPsystem at different waste heat temperatures Rref = 0–1
FR Recirculation flow ratio
h Enthalpy/(J·kg?1)
? Mass flow rate/(kg·s−1)
P Pressure/Pa
Q? Heat power/W
R Ratio
T Temperature/°C
DTLMTD Logarithmic mean temperature difference/°C
UA Heat exchanger performance/(W·K−1)
w Mass fraction
? Electric power/W
h Efficiency
Subscripts
abs Absorption
amb Ambient
bas Basic
com Compressor
en Energy
eva Evaporation
ex Exergy
gen Generator
H High pressure
HE Heat exchanger
l Liquid
L Low pressure
min Minimum
pole Pole
pump Pump
rec Rectifier
ref Refrigerant
refl Reflux
s Isentropic
use Useful
v Vapor
was Waste
  
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