China
Africa
Explore chapters and articles related to this topic
Introduction to Electronic Cooling
Published in Mathew V. K., Tapano Kumar Hotta, Hybrid Genetic Optimization for IC Chips Thermal Control, 2022
Mathew V. K., Tapano Kumar Hotta
Nevertheless, the passive cooling techniques are also equally important, especially in the module-level thermal management and for the low heat flux removal rates. They do not need any external power sources or any external energy for dissipating the heat from the electronic components. The cooling rate of the components is achieved naturally using the heat sinks integrated with the fins. The sub-types under these techniques are natural convection air cooling, thermoelectric cooling, heat pipe-based cooling, phase change material (PCM)-based cooling, etc.
Motor Cooling
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
The selection of appropriate and feasible cooling techniques depends basically on the required cooling load, cooling efficiency, cooling system operation reliability, cost of cooling system, temperature difference between the heat source and the environment, coolant thermophysical properties, geometries of heated sources, noise, and vibration. All these determining factors must be taken into account. The trade-off between these factors is highly desired in order to choose the best cooling technique for each particular application. Three liquids, namely, air, fluorocarbon (FC), and water, are chosen to compare their heat transfer coefficients for natural and forced convection and forced jet.
Refrigeration Cycles and HVAC Systems
Published in S. Bobby Rauf, Thermodynamics Made Simple for Energy Engineers, 2021
See Figure 11-9. The next step involves complete transformation of the refrigerant from liquid to gaseous phase through absorption of heat, or Δ h. This is an, non-adiabatic, isobaric process; so, draw a straight, horizontal, line from D to A. This step is referred to as the evaporator segment of the refrigeration cycle. This is where the system (refrigerant) performs cooling of the environment as its phase undergoes through latent transformation from liquid to gaseous phase. A – B:
LBM simulation of thermo-hydrodynamic and irreversibility characteristics of a nanofluid in microchannel heat sink under affecting a magnetic field
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Heat exchangers are widely used in the cooling industrial systems. Various active and passive methods have been developed to manage and decrease thermal energy consumption in heat exchangers and dependent instruments (Rashidi, Bovand, and Esfahani 2015; Rashidi and Esfahani 2015; Shirejini, Rashidi, and Esfahani 2016). After developing micro scale manufacturing, microchannel has been emerged as an efficient heat sink for various industrial systems (Alihosseini et al. 2020; Dixit and Ghosh 2015). Extending heat transfer surfaces by using the microchannels can considerably improve thermal performance (Kim and Mudawar 2015). Microchips (Khattak and Ali 2019), aerospace equipment (Qasem and Zubair 2018), bioengineering (Stosich et al. 2009) and HVAC systems (Hernandez and Fumo 2020) are some instances for usage microscale heat sinks. Considering higher thermal coefficient of conduction of metallic nanoparticles in comparison with the base fluid, microchannel heat transfer increases using the idea of nanofluids, which is a homogenous suspension of nanoparticles blending in a base fluid (Abbas et al. 2020; Bakthavatchalam et al. 2020; Mohammed et al. 2011). In spite of the advantageous of microchannel heat sinks, their heat transfer coefficient may be limited by dependency of the thermal performance to the amount of fluid flow. Although the applications and benefits of the microchannels are vast, the number of publications performed on this device is limited, especially those utilized nanofluids.
Modelling and optimisation the efficiency of crystalline silicon PV/T solar panel
Published in International Journal of Sustainable Energy, 2019
In general, two categories of cooling are present: passive and active cooling. Advantages and disadvantages of these cooling systems are reported by Hasan et al. (2010) and Zubeer, Mohammed, and Ilkan (2017). Passive and active cooling systems commonly use cooling mediums as air and liquid. The thermal properties of air (with low density and small heat capacity) make it less efficient as a coolant medium (Xu et al. 2012). However, this option is attractive in situations where water or other liquids are limited. Liquid cooling on the other hand, permits operation at much higher temperature levels and allows waste heat recovery to be employed more efficiently. In fact, liquid coolants have a higher specific heat capacity improving the overall performances (Daghigh, Ruslan, and Sopian 2011; Royne 2005). Also, collectors with liquid cooling have less temperature fluctuations compared to collectors with air cooling, making them more favourable (Daghigh, Ruslan, and Sopian 2011). Different liquid cooling can be used in solar panels (Bouzoukas 2008). Water is the most employed common fluid, but refrigerants that are able to undergo a phase change at a relatively low temperature are adopted in many systems (Makki, Omer, and Sabir 2015). In every case, the heat extraction is carried out via forced fluid circulation through series/parallel- connected pipes adhered to the rear of solar collector (Zhang et al. 2012; Zondag et al. 2002).
Exploring membrane-assisted radiant cooling for designing comfortable naturally ventilated spaces in the tropics
Published in Building Research & Information, 2021
Kian Wee Chen, Eric Teitelbaum, Forrest Meggers, Jovan Pantelic, Adam Rysanek
Thus, in the meantime, other forms of cooling will be required to provide additional cooling. Thermal comfort can be more easily achieved with concurrent mixed-mode cooling (Brager, 2006), where natural ventilation is coupled with active cooling systems. In this mode, natural ventilation is supplemented with active cooling systems when natural ventilation ceases to be sufficient. An active cooling system includes mechanical ventilation and mechanical cooling systems. Mechanical cooling includes systems such as air-conditioning and radiant cooling that depend on a refrigeration cycle for the removal of heat from a space.