The aim of this scientific research is to experimentally determine the exergy losses a ground heat pump and further optimization for more efficient use operating modes improvement individual structural elements. In addition, it proposed photovoltaic panels as backup power source experimental installation under study. exergetic are calculated, not only itself, with R407C refrigerant. methodology...

The European Union (EU) Regulation on fluorinated greenhouse gases (F-gases) has encouraged to reduce gradually the number of hydrofluorocarbons (HFC) that can be placed market (POM) 21% baseline level in 2030. However, this day, EU refrigeration, air conditioning and heat pump (RACHP) is still dominated by these substances. This study describes a methodology estimate refrigerant demand conditi...

A. 1 ohansson and P. Lundqvist Dept. of Energy Technology Div. of Applied Thennodynamics and Refrigeration The Royal Institute of Technology, KTH Stockholm, Sweden Test results from field retrofit situations, where R22 has been changed to Isceon 59 1 and R407C in two identical chillers, shows that both substitutes require more subcooling than R22 to give the system a satisfying performance. It ...

Little work has been done on the closed loop response of refrigeration plant using the new chlorine-free refrigerants. A simulation model of a water-water refrigeration plant using R134a is developed for the purpose of investigating control system performance. The well-established problem of coupling between the two main regulatory control loops governing evaporator degree-of-superheat and plan...

Steady state and dynamic simulation and optimization are a key step in the design of heating, ventilation, airconditioning and refrigeration (HVAC&R) systems. It is well known that the computation time in such simulations is dominated by the refrigerant thermophysical property calculations. These calculations generally involve calculating all thermophysical properties given one or two independe...

At present, China’s high-speed rail is in a period of rapid development. Most the refrigerants used Chinese motor train units at this stage are still R134a and R407c, which have an impact on environment. In response to environmental protection concept green travel, it great significance study air conditioning system using CO2 refrigerant. Using CFD simulation analysis technology, heat transfer ...