Experimental study of heat pump type air-water for heating system performance

Abstract

The operation of an air-to-water heat pump system providing space heating production for an administrative building in Varna has been explored. For this purpose, discontinuous operational mode of the heat pump system during wintertime is considered. Study has been performed by use of real values for external ambient temperature and operating characteristics of the heat pump system. The seasonal efficiency of the heat pump operation has been calculated. Also, the minimal external ambient temperature until the heat pump may work in heating regime and operation duration at outdoor air temperatures higher than the design air temperature can be determined. The economic analysis of the heat pump system exploitation has been made finally.

Numerical modelling of heat convection processes in the ducts of two-stage heat exchanger

“…The efficiency of heat consumers, representing various heat exchangers, has a significant importance in heat pump installations. The efficiency of these installations is also influenced by the parameters of the environment, as presented in [24].…”

Energy Efficiency in Constanta Harbor- A Theoretical Assessment of the Performance of a Heat Pump for Heating Needs, for a Less Pollutant Administration Office

“…Refrigerants responsible with ozone layer depletion, such as CFCs (Chlorofluorocarbons) and HCFCs (Hydrochlorofluorocarbons) are subjects of international regulations in respect with their use and production, a brief summary being given below [5] The environmental impact of refrigerants is assessed throughout ODP (Ozone Depletion Potential)related to the depletion of the ozone layer because of chlorine based gases and GWP (Global Warming Potential)related to the assessment of gases greenhouse effect, in connection with their radiative properties relative to carbon dioxide in a specific time setting; nowadays, HFCs (hydrofluorocarbons) are used in a wide range of refrigeration systems, R134a being one of the most common (see its main properties in Table 1 [6]). In our modern times, it is known the fact that buildings are high energy amounts consumers, this is why heat pumps are interesting technologies for these establishments; seen that the outdoor temperatures have a major influence on heating function of HPs, the Black Sea area climate offers the opportunity of obtaining maximum efficiency of these technologies [7].…”

Numerical modeling of the thermal conduction process in water-air convector’s fins

“…The investigation of heat transfer processes in the heat consumers of heat pump installations is important, in terms of the wide-ranging use of the heat pumps for different needs [15,[18][19][20][21]. An experimental reversible water-to-water heat pump installation for airconditioning is considered in [15] and [18].…”

“…An experimental reversible water-to-water heat pump installation for airconditioning is considered in [15] and [18]. The operation of air-to-water heat pump system for building's heating, has been investigated in [19]. In [20] and [21] mechanical vapor recompression heat pump for treatment of industrial wastewater, has been investigated.…”