Abstract
This paper develops a generalized design model using combined heat and mass transfer analysis for components used in absorption heat pump systems. The model can be applied to the design of an absorber, desorber, rectifier, condenser, or evaporator in NH 3-H 2O absorption heat pump systems. The physical significance of the ammonia composition in the absorbing/desorbing vapor, z, was studied. A composition map was generated by solving the diffusion and mass balance equations simultaneously for each component. It was found that the ammonia concentration in the absorbing/desorbing vapor cannot be found using only the liquid concentration or vapor concentration but must be determined using combined heat and mass transfer analysis. The composition of ammonia, z, should be z < x 1 for the rectifier, x 1 < z < x vb for condensers, x vb < z for absorbers, x vi < z for desorbers, and x 1 < z < x vi for evaporators. The results show that the mass transfer of ammonia and water is in the same direction for the rectifier, evaporator, and condenser, while it may be in the opposite direction for the absorber and desorber. The generalized design model developed in this paper can be used to investigate the effects of variable parameters, such as the heat transfer coefficient in each region, the vapor velocity, and the temperature deviation from the equilibrium, on the performance of each component.
| Original language | English |
|---|---|
| Title of host publication | ASHRAE Transactions |
| Publisher | ASHRAE |
| Pages | 444-453 |
| Number of pages | 10 |
| Volume | 103 |
| Edition | 1 |
| Publication status | Published - 1997 |
| Externally published | Yes |
| Event | Proceedings of the 1997 ASHRAE Winter Meeting - Philadelphia, PA, USA Duration: 1997 Jan 26 → 1997 Jan 29 |
Other
| Other | Proceedings of the 1997 ASHRAE Winter Meeting |
|---|---|
| City | Philadelphia, PA, USA |
| Period | 97/1/26 → 97/1/29 |
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ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
Cite this
Generalized component design model by combined heat and mass transfer analysis in NH 3-H 2O absorption heat pump systems . / Kang, Yong Tae; Chen, Weibo; Christensen, Richard N.
ASHRAE Transactions. Vol. 103 1. ed. ASHRAE, 1997. p. 444-453.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Generalized component design model by combined heat and mass transfer analysis in NH 3-H 2O absorption heat pump systems
AU - Kang, Yong Tae
AU - Chen, Weibo
AU - Christensen, Richard N.
PY - 1997
Y1 - 1997
N2 - This paper develops a generalized design model using combined heat and mass transfer analysis for components used in absorption heat pump systems. The model can be applied to the design of an absorber, desorber, rectifier, condenser, or evaporator in NH 3-H 2O absorption heat pump systems. The physical significance of the ammonia composition in the absorbing/desorbing vapor, z, was studied. A composition map was generated by solving the diffusion and mass balance equations simultaneously for each component. It was found that the ammonia concentration in the absorbing/desorbing vapor cannot be found using only the liquid concentration or vapor concentration but must be determined using combined heat and mass transfer analysis. The composition of ammonia, z, should be z < x 1 for the rectifier, x 1 < z < x vb for condensers, x vb < z for absorbers, x vi < z for desorbers, and x 1 < z < x vi for evaporators. The results show that the mass transfer of ammonia and water is in the same direction for the rectifier, evaporator, and condenser, while it may be in the opposite direction for the absorber and desorber. The generalized design model developed in this paper can be used to investigate the effects of variable parameters, such as the heat transfer coefficient in each region, the vapor velocity, and the temperature deviation from the equilibrium, on the performance of each component.
AB - This paper develops a generalized design model using combined heat and mass transfer analysis for components used in absorption heat pump systems. The model can be applied to the design of an absorber, desorber, rectifier, condenser, or evaporator in NH 3-H 2O absorption heat pump systems. The physical significance of the ammonia composition in the absorbing/desorbing vapor, z, was studied. A composition map was generated by solving the diffusion and mass balance equations simultaneously for each component. It was found that the ammonia concentration in the absorbing/desorbing vapor cannot be found using only the liquid concentration or vapor concentration but must be determined using combined heat and mass transfer analysis. The composition of ammonia, z, should be z < x 1 for the rectifier, x 1 < z < x vb for condensers, x vb < z for absorbers, x vi < z for desorbers, and x 1 < z < x vi for evaporators. The results show that the mass transfer of ammonia and water is in the same direction for the rectifier, evaporator, and condenser, while it may be in the opposite direction for the absorber and desorber. The generalized design model developed in this paper can be used to investigate the effects of variable parameters, such as the heat transfer coefficient in each region, the vapor velocity, and the temperature deviation from the equilibrium, on the performance of each component.
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M3 - Conference contribution
VL - 103
SP - 444
EP - 453
BT - ASHRAE Transactions
PB - ASHRAE
ER -