Testing and performance analysis of a hollow fiber-based core for evaporative cooling and liquid desiccant dehumidification

In this study, an innovative heat and mass transfer core is proposed to provide thermal comfort and humidity control using a hollow fiber contactor with multiple bundles of micro-porous hollow fibers. The hollow fiber-based core utilizes 12 bundles aligned vertically, each with 1,000 packed polypropylene hollow fibers. The proposed core was developed and tested under various operating and ambient conditions as a cooling core for a compact evaporative cooling unit and a dehumidification core for a liquid desiccant dehumidification unit. As a cooling core, the fiber-based evaporative cooler provides a maximum cooling capacity of 502 W with a wet bulb effectiveness of 85%. As a dehumidification core and employing potassium formate as a liquid desiccant, the dehumidifier is capable of reducing the air relative humidity by 17% with an overall dehumidification capacity of 733 W and humidity effectiveness of 47%. Being cheap and simple to design with their attractive heat and mass transfer characteristics and the corresponding large surface area-to-volume ratio, hollow fiber membrane contactors provide a promising alternative for cooling and dehumidification applications

The Complexity of Trust in Business Collaborations

Research on trust in business collaborations is generally founded on the premises that: a) cognitive trust is initially defined within contractual procedures; b) positive experiences lead to adjustments in contractual and/or informal arrangements, and c) cognitive trust is eventually supplanted by affective trust. This dynamic, process view of trust fails to capture the impact of trust experiences in external collaborations on trust emergence in a focal collaboration, and the complexity of trust co-evolution as each actor interprets and responds to the other's communication, behaviour and action. A complexity conceptualisation of trust as a self-organising, adaptive phenomenon can help us better understand the way trust develops. Through engaging with complexity theories as metaphors to enrich trust theory, trust is described as 'self-organising' as new cognitive, interpretive schema are evoked, and 'adapting' in response to trust experiences external to the collaboration. A complexity perspective evokes a new field of research questions and rich methodological opportunities