Abstract
In present study, a novel heat pump named multi-functional heat pump systems for dishwashers is introduced. 45 oC hot water cycle and hot air cycle are provided by the single-stage heat pump cycle to complete the cleaning and drying process. Moreover, the high temperature water at 85 °C is provided by the two-stage heat pump cycle system to achieve the disinfection function, and the 26°C cold air is realized by the single-stage refrigeration cycle for rapid cooling. Thermodynamic analysis of multi-functional heat pump systems for dishwashers under four different operating conditions with R22 / R134a as working fluid was carried out. The results show that COP (coefficient of performance) of the system is above 3.2 under all four conditions, which meets the energy efficiency rating index. Comparing energy efficiency and environmental benefits and operating costs of multi-functional heat pump systems for dishwashers with the traditional electric heating dishwashers, these can be known that primary energy consumption, carbon dioxide emissions and operating cost of multifunctional heat pump dishwasher are 1.24 * 105kJ, 10.55kg and 21.70 Yuan respectively under the condition of per running energy consumption for 40kW·h, above three all lower than the traditional electric heating dishwasher.
Highlights
Environmental protection and the sustainable use of energy have drawn great attention from all countries in recent years
It is concluded that the cascade heat pump system is stable and reliable by adopting the principle of the second stage compression ratio is approximately equal to the optimal middle pressure which determined corresponding to the optimal middle temperature
This study aims to develop a multifunctional heat pump system for dishwashers, which present four different operation modes including hot water, hot air, cold air and high temperature water
Summary
Environmental protection and the sustainable use of energy have drawn great attention from all countries in recent years. Almahdi et al studied a potential cascaded vapor compression heat pump that is proposed to address the high temperature heat demand in the copper chlorine (Cu-Cl) thermochemical cycle for hydrogen production [6]. It concluded that such cascaded heat pumps utilize industrial waste heat as the heat source can meet Cu2OCl2 decomposition reactor heat demand. This study aims to develop a multifunctional heat pump system for dishwashers, which present four different operation modes including hot water, hot air, cold air and high temperature water. The proposed multi-functional heat pump system has four operating modes: hot water, hot air, cold air and high temperature water. M hc ge ee ap ae heating cycle refrigeration cycle state numbers multifunctional heat pump dishwasher traditional electric heating dishwasher heat consumption grid transmission efficiency electric water heater heating efficiency air heat pump national average power generation efficiency
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