Sökning: "radiative cooling"

Visar resultat 1 - 5 av 19 uppsatser innehållade orden radiative cooling.

1. 1. Preliminary Design of a 30 kN Methane-Oxygen-powered Electric-Pump-fed Liquid Rocket Propulsion System

   Master-uppsats, Luleå tekniska universitet/Rymdteknik

   Författare :Vikramjeet Das; [2023]
   Nyckelord :rocket engine; liquid rocket; methalox; electropump; LRPS; LPRE; liquid methane; electric pump feed system;

   Sammanfattning : The design of a liquid rocket propulsion system, unlike that of a standalone system, is intertwined with the overall development of a number of associated systems and is influenced by a multitude of conditions and considerations: from the requirements needed to accomplish the mission to the rationalizations involved behind the development of each rocket system and/or component. In my thesis, the preliminary design of a “new generation” 30 kN rocket engine driven by an electric pump feed system and running on liquid methane and liquid oxygen is performed. LÄS MER

3. 2. Climate effects of managed boreal forests : combining effects from carbon balance and albedo

   Master-uppsats, SLU/Dept. of Soil and Environment

   Författare :Anna Valeria Requardt; [2023]
   Nyckelord :Remotely Sensed Albedo; Age-Albedo pattern; C-flux Radiative Forcing; Boreal Forests Climate Effect;

   Sammanfattning : Boreal forests are considered as a global carbon (C) sink and are utilized for climate-change mitigation. Judging the climate impact of a forest solely on its C balance might leave an incomplete picture, since forest-climate feedbacks are also caused by various other biophysical and biogeochemical processes, e.g., albedo effects. LÄS MER

4. 3. Optical Studies of Cellulose-Based Materials for Spectral Design of Camouflage and Passive Cooling Applications

   Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

   Författare :Olivia Grönlund Falk; Felix Valentin; [2022]
   Nyckelord :Nanocellulose; optical properties; spectroscopy; ellipsometry; BRDF measurements; optical microscopy; reflectance; transmittance; absorptance; transflectance; spectral design; camouflage; passive radiative cooling;

   Sammanfattning : In the past few years, studies regarding new bio-based materials have led to an increased attention in the nanoscale product of cellulose, called nanocellulose. This biodegradable and renewable material has interesting physical, optical and thermal properties. LÄS MER

5. 4. Intercomparison of a Dynamic Ocean for Earth-like Aqua-planets

   Kandidat-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Fredrik Plane; [2022]
   Nyckelord :Astrobiology; Planets; Aqua-planets; Atmosphere and Ocean physics; Exoplanet; Habitability; General Circulation Model; GCM; Climate Modelling; Dynamic Ocean;

   Sammanfattning : I present herein an ensemble of ROCKE-3D aqua-planet simulations which I compare with the simulations presented in the work of Yang et al. (2019) and other similar works. The focus was on contrasting differences in the greenhouse effect between the models. LÄS MER

7. 5. Water born cooling of closed greenhouses : An enclosed vertical water curtain cooling system

   Magister-uppsats, Högskolan Dalarna/Institutionen för information och teknik

   Författare :Ahmad Kamal; [2022]
   Nyckelord :Greenhouses; Water born cooling; Enclosed water curtain; radiative cooling; Surplus heat energy;

   Sammanfattning : The greenhouses play a key role in food sustainable production, the purpose of the greenhouses is to make an artificial suitable environment to grow different kinds of plants. The cost of energy used in the greenhouses to ensure the optimum temperature, humidity, and CO2 concentration, makes up a large part of the final cost of food. LÄS MER