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Exergy, Environmental, and Economic Analyses of Solar-Powered Dedicated Mechanical Subcooling Refrigeration in Hot Climates
Get PDFField and Lab Testing of Residential Heat Pumps to Assess Representativeness of Fixed-speed and Load-based Test Methods
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Refining Equation Of State Models For Refrigerant Mixtures Around The Critical Temperature Of One Component.
Get PDFSimultaneous Deep Dehumidification and Sub-Dew Point Cooling by Combined Sorption Dehumidification and Evaporative Cooling (CoSDEC): The Effect of Inlet Air Condition
Get PDFExperimental Study of Frost Formation and Various Defrosting Techniques on a Microchannel Evaporator in a Real Reversible Air Source Heat Pump System
Get PDFA Simultaneous Approach for Heat and Cold Production Enabled by Heat Pump and Latent Thermal Energy Storage
Get PDFThe shoulder effect in the stagnation zone for temperature-controlled jet impingement transition boiling of submerged dielectric fluid
No full textTwo-phase jet impingement is capable of high heat transfer coefficients and high boiling critical heat flux (CHF) limits, making it a suitable technology for electronics immersion cooling applications. Previous studies have focused on the heat-flux-controlled nucleate boiling performance of an impingement jet up to the CHF. Exploration of other boiling regimes that occur under temperature-controlled surfaces is of equal fundamental importance. It has been shown for free jets that a high and consistent heat flux can be dissipated over a wide range of surface superheats in the transition boiling regime when the surface is temperature-controlled. This so-called “shoulder effect”, or heat flux shoulder, is strongest in the stagnation zone, directly beneath the jet. It has only observed using free jets of water as the cooling for interest in metals processing applications. To exploit operation in this unique boiling regime for potential applications in immersion cooling of electronics, the occurrence of this shoulder effect, as well as means for estimating the shoulder heat flux across different operating conditions, must be investigated for submerged jets and dielectric coolants. In this work, temperature-controlled submerged jet impingement is experimentally characterized using HFE-7100. A copper heater sized to be completely covered by the jet stagnation zone is increased in surface temperature via a PID controller, which allows for steady-state, temperature-controlled data to be acquired. The boiling curves, including CHF and shoulder heat flux, are measured for 0.5–3 m/s jet velocities and 5–30 K inlet subcooling. The shoulder effect is shown to exist in these conditions and high-speed imaging reveals that the shoulder heat flux effect is an enhanced film-like mode of transition boiling. It is observed that there is a proportionality between the CHF and the shoulder heat flux for the conditions investigated. The measured trends and dependencies of the shoulder heat flux on inlet subcooling and jet velocity are used to assess available predictive tools
Pets in Practice: A Practical Guide to the Introduction of Dogs to Mental Health Work Settings Derived from the Direct Experiences of Staff
Get PDFThe aim of this study was to evaluate the introduction of dogs in mental health workplace settings: specifically, exploring staff perspectives on the acceptability of dogs in mental health teams; the impact of the dogs on themselves directly, their patients, and their team; and the challenges of implementing dogs in mental health settings. This qualitative study design used semi-structured interviews. Twelve participants were interviewed; six from a Crisis Assessment and Treatment team, five from a Recovery College team, and one from the Inpatient and Outreach Psychiatric Service. Interviews were transcribed and six key themes were identified: facilitating staff well-being, improving workplace morale, facilitating communication, impact on dog owner, environmental challenges, and improving perceptions of dogs. These findings informed Pets in Practice—A Practical Guide for Dogs in Healthcare.
This study demonstrates the benefits of a dog for staff well-being and working practices in mental health settings. Furthermore, it provides a practical guide to implementing such an intervention and managing the practical challenges of having a dog in a work environment. A policy relating to visiting animals that refers to points raised in the practical guide is recommended for health care settings implementing this intervention