Physical and operating conditions effects on silica gel/water adsorption chiller performance

This paper investigates the thermodynamic framework of a three-bed advanced adsorption chiller, where the mass recovery scheme has been utilized such that the performances of this chiller could be improved and a CFC-free-based sorption chiller driven by the low-grade waste heat or any renewable energy source can be developed for the next generation of refrigeration. Silica gel-water is chosen as adsorbent-refrigerant pair. The three-bed adsorption chiller comprises with three sorption elements (SEs), one evaporator and one condenser. The configuration of SE1 and SE2 are identical, but the configuration of SE3 is taken as half of SE1 or SE2. Mass recovery process occurs between SE3 with either SE1 or SE2 and no mass recovery between SE1 and SE2 occurs. The mathematical model shown herein is solved numerically. In the present numerical solution, the heat source temperature variation is taken from 50 to 90ºC along with coolant inlet temperature at 30ºC and the chilled water inlet temperature at 14ºC. A cycle simulation computer program is constructed to analyze the influence of operating conditions (hot and cooling water temperature) on COP (coefficient of performance), SCP (specific cooling power), η (chiller efficiency) and chilled water outlet temperature. Keywords: Adsorption; COP; SCP; Mass recovery; Silica gel-waterDOI: 10.3329/jname.v3i2.920 Journal of Naval Architecture and Marine Engineering 3(2006) 59-67

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Design and experimental study of a silica gel-water adsorption chiller with modular adsorbers

International Journal of Refrigeration ◽

10.1016/j.ijrefrig.2016.03.001 ◽

2016 ◽

Vol 67 ◽

pp. 336-344 ◽

Cited By ~ 53

Author(s):

Q.W. Pan ◽

R.Z. Wang ◽

L.W. Wang ◽

D. Liu

Keyword(s):

Experimental Study ◽

Silica Gel ◽

Water Adsorption ◽

Adsorption Chiller

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Two-Stage Non-Regenerative Silica Gel-Water Adsorption Refrigeration Cycle

10.1115/imece2000-1297 ◽

2000 ◽

Author(s):

B. B. Saha ◽

K. C. A. Alam ◽

A. Akisawa ◽

T. Kashiwagi ◽

K. C. Ng ◽

...

Keyword(s):

Heat Pump ◽

Silica Gel ◽

Water Adsorption ◽

Waste Heat ◽

Cooling Capacity ◽

Coefficient Of Performance ◽

Adsorption Refrigeration ◽

Two Stage ◽

Adsorption Chiller ◽

Adsorption Heat Pump

Abstract Over the past two decades there have been considerable efforts to use adsorption (solid/vapor) for cooling and heat pump applications, but intensified efforts were initiated only since the imposition of international restrictions on the production and use of CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). Closed-type, conventional adsorption refrigeration and heat pump systems have an increasing market share in Japan. In this paper, a two-stage non-regenerative, silica gel-water adsorption chiller design is outlined. Experimental measurements are performed on a prototype of a 3.5 kW rated cooling capacity adsorption heat pump in order to determine its performance under different operating temperatures (hot, cooling and chilled water). The chiller performance is analyzed in terms of cooling capacity and coefficient of performance (COP). The main innovative feature in the two-stage adsorption chiller is the ability to utilize low-temperature waste heat (∼55°C) as the driving source with a cooling source of 30°C. The technological difficulty inherent in operating a thermally activated cycle with such a small regenerating temperature lift (temperature difference between heat source and heat sink inlets) is overcome by use of a two-stage cycle.

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