Hybrid liquid desiccant air-conditioning system: Experiments and simulations

Yamaguchi, Seiichi; Jeong, Jongsoo; Saito, Kiyoshi; Miyauchi, Hikoo; Harada, Masatoshi

doi:10.1016/j.applthermaleng.2011.04.009

Cited by 95 publications

(21 citation statements)

References 9 publications

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“…(3) In the third category, q evap and q cond match q sol,cool and q sol,heat , respectively. Thus, no auxiliary equipment is required to be installed in this case (Bergero and Chiari, 2010Zhao et al, 2011;Yamaguchi et al, 2011;Zhang et al, 2013). There is no information mentioned about capacity matching in the studies in this category and therefore, it is not clear whether capacity matching exists under design conditions or all operating conditions of the heat-pump LDAC system.…”

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confidence: 90%

Capacity matching in heat-pump membrane liquid desiccant air conditioning systems

Abdel-Salam

Simonson

2014

International Journal of Refrigeration

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confidence: 90%

Capacity matching in heat-pump membrane liquid desiccant air conditioning systems

Abdel-Salam

Simonson

2014

International Journal of Refrigeration

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“…On the other hand, the heat pump-driven liquid desiccant system (HPLD) has also been studied [9][10][11][12] by focusing on its dehumidification performance, energy consumption, and matching heat pump capacity to the required solution cooling and heating loads. Yamaguchi et al [9] conducted HPLD performance tests and discussed methods for improving the system efficiency. They concluded that the coefficient of performance (COP) of the HPLD could be increased by enhancing the compressor isentropic efficiency and the solution heat exchanger efficiency.…”

Section: Of 21mentioning

confidence: 99%

“…m abs,moi ) is determined by Equation 7, and thus, the solution mass flow rate at the state point P3 can be expressed by Equation (8). Based on the mass balance, the concentration of the desiccant solution at each state point of the absorber side can also be expressed by Equations (9) and (10).…”

Section: Absorber Modelmentioning

confidence: 99%

Impact of Heat Pump-Driven Liquid Desiccant Dehumidification on the Energy Performance of an Evaporative Cooling-Assisted Air Conditioning System

Shin

Park

et al. 2018

Energies

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The main objective of this research is to investigate the energy performance enhancement obtained by applying a heat pump to a liquid desiccant and indirect and direct evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS). In conventional LD-IDECOAS operation, the boiler providing regeneration heat to the weak desiccant solution consumes most of the energy. In order to reduce the regeneration energy consumption in the LD-IDECOAS, a heat pump-integrated LD-IDECOAS (HPLD-IDECOAS) is suggested in this research. The heat pump reclaims waste heat from the absorber side of the system, and delivers the reclaimed heat to the regenerator side. Detailed energy simulations for both the LD-IDECOAS and HPLD-IDECOAS were conducted to analyze the energy saving potentiality of the proposed system over the conventional LD-IDECOAS. In both systems, it was assumed that a packed-bed type liquid desiccant unit with an aqueous solution of lithium chloride (LiCl) was used. In the proposed system, a heat pump with R-134a refrigerant was adopted. The results show that the proposed system was able to provide a 33% reduction in annual primary energy consumption compared with the conventional LD-IDECOAS. This significantly enhanced energy performance was mainly obtained through an 83% reduction in the gas energy consumed for regeneration of the desiccant solution in the proposed system by applying the heat pump.

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“…The results show 60% energy savings at high latent heat load compared with a traditional direct expansion air conditioning system [12][13]. Yamaguchi et al (2011) conducted the performance evaluation test of a hybrid liquid desiccant air-conditioning system consisting of a conventional liquid desiccant system and a vapor compression heat pump. The main feature of this system is that the absorber and regenerator are integrated with the evaporator and condenser, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The main feature of this system is that the absorber and regenerator are integrated with the evaporator and condenser, respectively. The results showed that the COP of the system was 2.71 [14]. Zhao et al (2011) investigated the real operating performance of the temperature and humidity independent control air-conditioning system.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a novel liquid desiccant-vapor compression hybrid air-conditioning system

Zhang

Tan³

et al. 2016

Energy

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Liquid desiccant-vapor compression hybrid (LDCH) airconditioning systems are popular for reducing energy consumption. This work tests a conventional LDCH airconditioning experimental setup and establishes the corresponding mathematical model to analyze the effect of the concentrated solution branch in the solution-solution heat exchanger (SSHE) on the cooling capacity of the evaporator; the results show that the percentage of cooling capacity loss of the evaporator exceeds 10% with the small concentration difference of 1.5% in the conventional LDCH airconditioning system. Afterwards, a new LDCH airconditioning system is proposed by adopting an auxiliary regenerator to cut down the cooling capacity loss of the evaporator, and the analysis results show that there is a big temperature drop of the concentrated solution branch after being pretreated by the auxiliary regenerator; under the condition of concentration difference of 2.65%, the inlet temperature of concentrated solution branch from the regeneration side in the SSHE can decrease over 6 ℃; and the extra heat load entering the dehumidification side from the regeneration side obviously decreases. Consequently, the evaporator only needs to spend 1.5% of its cooling capacity on the compensation for the extra heat load.

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Hybrid liquid desiccant air-conditioning system: Experiments and simulations

Cited by 95 publications

References 9 publications

Capacity matching in heat-pump membrane liquid desiccant air conditioning systems

Capacity matching in heat-pump membrane liquid desiccant air conditioning systems

Impact of Heat Pump-Driven Liquid Desiccant Dehumidification on the Energy Performance of an Evaporative Cooling-Assisted Air Conditioning System

Performance analysis of a novel liquid desiccant-vapor compression hybrid air-conditioning system

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