JSC Heat Pump Development StatusMichael K. Ewert/ (281)483-9134/ [email protected] Heat pumps can be used in warm thermal environments to raise the temperature of wasteheat to a level that makes it more efficient to reject to space through thermal radiatorpanels. This reduction in radiator panel volume and mass comes at the expense of poweruse. However, in many c...

On one hand, the use of solar energy for heating and electricity production should increase in the future to reduce greenhouse emissions. On the other hand, the use of water to water heat pumps allows the production of heat effectively in many applications. In this context, it is appropriate to study the concept of a reversible HP/ORC unit. This innovative system includes a water to water heat ...

introduction electrical performance of solar cells decreases with increasing cell temperature, basically because of growth of the internal charge carrier recombination rates, caused by increased carrier concentrations. hybrid photovoltaic/thermal (pvt) systems produce electrical and thermal energy simultaneously. pvt solar collectors convert the heat generated in the solar cells to low temperat...

Solar-driven non-stoichiometric thermochemical redox cycling of ceria for the conversion of solar energy into fuels shows promise in achieving high solar-to-fuel efficiency. This efficiency is significantly affected by the operating conditions, e.g. redox temperatures, reduction and oxidation pressures, solar irradiation concentration, or heat recovery effectiveness. We present a thermodynamic ...

The purpose of this study was to determine and compare the performances of conventional and heat pump systems for cooling open and closed loop (confined) greenhouse systems. A dynamic simulation model was developed and validated to predict energy and mass exchanges in a greenhouse as a function of dynamic environmental factors. The model has options to evaluate the effects of location, time of ...

the use of solar collectors in combination with heat pipes is rapidly growing in recent years.heat pipes, as heat transfer components, have undeniable advantages in comparison with other alternatives. the most important advantage is their high rate of heat transfer at minor temperature differences. although there have been numerous studies on the heat analysis or first thermodynamic analysis of...