Sorption heats

Miles D.J. et al. Gas fired sorption heat pump development. In proceedings of Solid Sorption Refrigeration, Paris, irR,1992, pp. 74 79. 

Conditioning Engineers. (1996). Absorption/Sorption Heat Pumps and Refrigeration Systems. Atlanta ASHRAE. 

Recently a follow-up project entitled Modular High Energy Density Sorption Heat Storage (MODESTORE) was approved by the European... 

Beckmann, J., and W. Albers, 1996. Air Conditioning and Dehumidification by a Lithium Bromide/Lithium Chloride Liquid Desiccant Technology, InAb-Sorption96 International Ab-Sorption Heat Pump Conference, Natural Resources Canada, Quebec, Canada, pp. 697-702. 

Thermogravimetry can be used to measure the amount of water [232] or other molecule adsorbed on a zeolite. DSC can be uhlized to study the thermal effects during adsorption and desorphon of water [233] because the peak area under the heat flow time curve is related to the sorption heat. 

Loewer, H., "Sorption Heat Pumps as Heating Machines,"... 

Keywords Carbon, hydrogen, sorption, heat pipe, adsorption storage... 

Apart from concentration dependance, sorption is strongly exothermic and desorption endothermic, so that sorption heats and desorption cools the crystals locally. Since Da = Do exp — E/RT, Da for sorption could exceed Da for desorption. 

Beutler, A., Hoffmann, L., Ziegler, E., Alefeld, G., Gommed, K., Grossman, G., and Shavit, A. (1996) Experimental Investigation of Heat and Mass Transfer on Horizontal and Vertical Tubes, Proceedings of the International Ab-Sorption Heat Pump Conference, Montreal, Canada, pp. 409-419. 

Meacham, J. M., and Garimella, S. (2002) Experimental Demonstration of a Prototype MicroChannel Absorber for Space-Conditioning Systems, International Sorption Heat Pump Conference, Shanghai, China, pp. 270-276. 

SORPTION HEAT PIPE - A NEW DEVICE FOR THERMAL CONTROL AND ACTIVE COOLING... 

Phase 2. After the Phase 1 accomplishment the porous valve (5) is opened and the vapor pressure inside the heat pipe is equalizing following the procedure of the liquid evaporation inside the porous structure of the evaporator (6). The schematic of sorption heat pipe evaporator is shown on Fig. 1, Fig.3. During the liquid (7) evaporation, the air is cooling inside the cold box, (8). When the liquid evaporation is finished and the sorbent bed is saturated, a porous valve is closed and the sorbent bed is cooled down to the ambient temperature with the help of the heat pipe condenser (3). The phase 2 is finished. 

Figure F. Sorption heat pipe. 1 — vapor channel 2 - porous sorption structure 3 - finned surface of heat pipe evaporator/condenser 4 - porous wick inside heat pipe 5- porous valve 6 - heat pipe low temperature evaporator with porous wick 7- working fluid accumulated inside the evaporator 8 - cold box.

The considered experimented set - up can be applied in two different ways. The first one is to use is as a semiconductor sensor cooler with low heat dissipation to cool the sensor down to the ambient temperature. It is interesting to be applied in cryogenic range of temperatures. The second option is related with the cooler for high energy dissipation devices (for example laser diode cooler). The first set of experiments was performed with sorption heat pipe and ammonia as a working fluid to demonstrate the basic possibility to decrease the temperature of the heat loaded wall to compare with the temperature of this wall in the phase of loop heat pipe cooling mode. 

Sorption heat pipe is a novelty and combines the enhanced heat and mass transfer typical for conventional heat pipe with sorption phenomena in the sorbent structure. The sorption heat pipe parameters are insensitive to some g acceleration and such heat pipe can be suggested for space and ground application. 

Significant heat transfer enhancement is obtained in the sorption heat pipe to compare with a conventional loop heat pipe for the same fluid (ammonia) and evaporator dimensions during operation of a sorption bloc. 

Sorption heat pipe can be considered as a cryocooler, applied for deep cooling of sensors down to the triple point of the hydrogen (nitrogen) with cyclic or periodic operation in space. The working fluid can be stored in sorption material of SHP at low pressure. 

Sorption heat pipe can be used as an efficient multi micro jet cooler of the laser diode with good thermal contact of the SPH porous wick and heat loaded wall, insensitive to some g acceleration and capable to dissipate high heat fluxes q > 200 W/cm for ammonia with low surface superheat. 

Sorption Heat Pipe - A New Device for Thermal Control and Active Cooling 465... 

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