NASA is currently using a solid amine sorbent known as HSC + for regeneratively removing CO 2 in space shuttle applications. This sorbent may also be of value for CO 2 removal in various industrial processes such as greenhouse gas control, industrial syntheses, and natural gas purification. To design novel sorbents and to design a CO 2 scrubber based on HSC + , physical and thermochemical property data are required. In this paper, we present a detailed experimental investigation of property data and long-term performance results using HSC + as a CO 2 sorbent. Differential scanning calorimetry was used to determine the heat capacity of the material. Cyclic and equilibrium capacities of the material for CO 2 pickup were determined and long-term test data show excellent performance. In addition, we have determined the heat of adsorption associated with CO 2 pickup by HSC + and the effect of moisture, using isothermal flow calorimetry. We have also performed thermal gravimetric analyses on the materials to gain insight into the stability of the material and determine the temperatures at which CO 2 and constituents of HSC + leave the surface of the material.
NASA is developing new portable life support system (PLSS) technologies, which are being demonstrating in an unmanned ground based prototype unit called PLSS 2.0. One set of technologies within the PLSS provides suitable ventilation to an astronaut while on an EVA. A new component within the ventilation gas loop is a gas-to-water heat exchanger to transfer excess heat from the gas to the thermal control system's liquid coolant loop. A unique bench top prototype heat exchanger was built and tested for use in PLSS 2.0. The heat exchanger was designed as a counter-flow, compact plate fin type using stainless steel. Its design was based on previous compact heat exchangers manufactured by UTC Aerospace Systems (UTAS), but was half the size of any previous heat exchanger and one third the size of previous gas-to-liquid heat exchangers. The prototype heat exchanger is less than 40 cubic inches and weighs 2.57 lb. Performance of the heat exchanger meets the requirements and the model predictions at 200 lb/hr of water and 6 acfm of 4.1 psia nitrogen. The water side and gas side pressure drops are less than 0.8 psid and 0.5 inches of water, respectively. It transfers 20 watts of heat at nominal conditions with an effectiveness of 94%. I. Nomenclatureacfm = actual cubic feet per minute lb = pound force psia = absolute pressure in pounds per square inch psid = differential pressure in pounds per square inch Px = pressure transducer Tx = thermocouple Vx = valve
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