Showing 41 - 50 of 367
Thermal conductivity and thermal borehole resistance are basic parameters for the technical and sustainable design of closed ground source heat pump (GSHP) systems. One of the most common methods to determine these parameters is the thermal response test (TRT). The response data measured are...
Persistent link: https://www.econbiz.de/10011045248
In this paper different approaches to groundwater flow and its effect in the vicinity of a borehole ground heat exchanger are discussed. The common assumption that groundwater flow in hard rock may be modelled as a homogeneous flow in a medium with an effective porosity is confronted and models...
Persistent link: https://www.econbiz.de/10011045725
Structured form-stable phase change composites were prepared by wet milling and hot-compaction of microencapsulated phase change material (MPCM), expanded graphite (EG) and high density polyethylene (HDPE). In the composites, MPCM serves as a latent heat storage material, EG as a heat transfer...
Persistent link: https://www.econbiz.de/10011046117
Aerogel is a kind of synthetic porous material, in which the liquid component of the gel is replaced with a gas. Aerogel has specific acoustic properties and remarkably lower thermal conductivity (≈0.013W/mK) than the other commercial insulating materials. It also has superior physical and...
Persistent link: https://www.econbiz.de/10011049060
The effect of thermal conductivity of the absorber plate of a solar collector on the performance of a thermo-siphon solar water heater is found by using the alternative simulation system. The system is assumed to be supplied of hot water at 50°C and 80°C whereas both are used in domestic and...
Persistent link: https://www.econbiz.de/10011049103
PA/GO (palmitic acid/graphene oxide) as PCMs (phase change materials) prepared by vacuum impregnation method, have high thermal conductivity. The GO (graphene oxide) composite was used as supporting material to improve thermal conductivity and shape stabilization of composite PCM (phase change...
Persistent link: https://www.econbiz.de/10011053239
LED (light emitting diode) technology has been developed rapidly in recent years in the area of illumination applications. However, the rate of heat generation increases with the LED illumination intensity. The LED chip temperature is critical to determine the LED lifetime and efficiency. In...
Persistent link: https://www.econbiz.de/10011053279
Graphite nanoplatelets (GnPs), obtained by sonicating the expanded graphite, were employed to simultaneously enhance the thermal (k) and electrical (σ) conductivity of organic form-stable phase change materials (FSPCMs). Using the method of in situ polymerization upon ultrasonic irradiation,...
Persistent link: https://www.econbiz.de/10011053397
Performances of spherical macrocapsules (nodules) currently used in latent heat-based thermal energy storage (TES) industrial units have been enhanced by the addition of graphite particles to the phase change material (PCM). Two different graphite types, namely graphite flakes (GF) and expanded...
Persistent link: https://www.econbiz.de/10011054055
In the present study, phase change materials based on epoxy resin paraffin wax with the melting point 27 °C were used as a new energy storage system. Thermophysical properties and the process of melting of a PCM (phase change material) composite were investigated numerically and...
Persistent link: https://www.econbiz.de/10011054489