Performance optimization of two-bed closed-cycle solid-sorption heat pump systems

Zheng, W.; Worek, William M.; Nowakowski, G.

doi:10.1007/bf02537415

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…The adsorption temperature was [35][36][37][38][39][40] • C. Restuccia and Cacciola 18 noted the limitations of the two methods utilized previously to enhance heat transfer: Concept 1), thick (≥1 cm) consolidated adsorbent bricks (Fig. 4), and concept 2), thin (≤500 µm) deposited layers of adsorbent on HTF tubes in a shell and tube heat exchanger.…”

Section: Review Of Literature On Regenerative Solid-vapor Adsorptimentioning

confidence: 98%

“…Zheng et al 39,40 developed a dimensionless model of an adsorption heat pump and performed parametric studies for a range of cycle times, adsorbent conductivity, and contact conductance between the heat exchanger and the adsorbent. They observed that for a given NTU, there is an optimal nondimensional switching frequency (bank cycle time) that nets the highest COP C .…”

Section: Ponsmentioning

confidence: 99%

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Review of Regenerative Adsorption Heat Pumps

Lambert

Jones

2005

Journal of Thermophysics and Heat Transfer

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Section: Review Of Literature On Regenerative Solid-vapor Adsorptimentioning

confidence: 98%

Section: Ponsmentioning

confidence: 99%

Review of Regenerative Adsorption Heat Pumps

Lambert

Jones

2005

Journal of Thermophysics and Heat Transfer

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“…On the other hand, a too long 2 cycle time results in a quite high heating power on the cost of a too poor COP. The effect of switching speed on the two bed thermal wave cycle performance has been numerically studied by Zheng et al [7][8]. They showed that there is an optimum switching speed to optimize COP and cooling capacity, which are different, for a given design and set of operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that there is an optimum switching speed to optimize COP and cooling capacity, which are different, for a given design and set of operating conditions. Alam et al [1] have investigated numerically the influence of heat exchanger design parameters on the system performance as well as on the switching frequency defined previously by Zheng et al [7][8] of a two-bed silica gel-water thermal wave cooling system. They showed that the optimum switching frequency is strongly dependent on the heat exchanger design parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effect of the switching frequency on the performance of a thermal wave adsorption heat pump

El-Rab

Khaled

Dawoud

et al. 2013

Mechanics & Industry

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In this work, a two modular zeolite water adsorption heat pump (AHP) based on the thermal wave concept has been experimentally investigated. Each module composes of two heat exchangers contained in a hermetic stainless steel vessel. The first heat exchanger is the adsorber/desorber located on the top of the vessel, while the second is the evaporator/condenser heat exchanger located on the bottom of the vessel. Throughout this work, the effect of the non-dimensional switching frequency, which has been introduced and theoretically investigated by Alam et al. [1] on COP and the mean heating power of an adsorption heat pump has been experimentally investigated under one typical working condition of AHPs. The results showed that the switching frequency and adsorber/desorber flow rate have strong influences on both COP and the mean heating power. It has been also found that there is an optimum switching frequency corresponding to each flow rate, at which the COP attains its maximum value. The obtained optimum switching frequencies varies slightly from 0.28 at an adsorber fluid flow rate of 0.6 l/min to 0.32 at 1 l/min.

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“…The study of the influence of cycle time and switching frequency on adsorption chiller performance has been initiated by Worek and coworkers [5,6], who proposed a model considering only the convection term for heat flow, and Ben Amar et al [7], who studied the case of a temperature-wave regenerative adsorption cooling cycle. Yang et al [8] designed a compact adsorption chiller.…”

Section: Introductionmentioning

confidence: 99%