Abstract
This article proposes a dual heat source heat pump bathroom unit with preheater which is feasible for a single family. The system effectively integrates the air source heat pump (ASHP) and wastewater source heat pump (WSHP) technologies, and incorporates a preheater to recover shower wastewater heat and thus improve the total coefficient of performance (COP) of the system, and it has no electric auxiliary heating device, which is favorable to improve the security of the system operation. The process simulation software ASPEN PLUS, widely used in the design and optimization of thermodynamic systems, was used to simulate various cases of system use and to analyze the impact of the preheater on the system. The average COP value of a system with preheater is 6.588 and without preheater it is 4.677. Based on the optimization and analysis, under the standard conditions of air at 25 °C, relative humidity of 70%, wastewater at 35 °C, wastewater flow rate of 0.07 kg/s, tap water at 15 °C, and condenser outlet water temperature at 50 °C, the theoretical COP of the system can reach 9.784 at an evaporating temperature of 14.96 °C, condensing temperature of 48.74 °C, and preheated water temperature of 27.19 °C.
Highlights
Along with the increasingly serious environmental pollution and scarce resources, people have paid more and more attention to energy conservation and emissions reduction [1,2]
Various forms of heat pump (HP) technology have been gradually popularized in recent years, such as air source heat pump (ASHP) technology, wastewater source heat pump (WSHP) technology, ground source heat pump (GSHP) technology [3] and underground water source heat pump (UWSHP) technology [4]
3, the water temperature the water mixer outlet increases as wastewater temperature at Figure the preheater inlet increases, thusateventually, the water temperature at wastewater temperature at the preheater inlet increases, eventually, the water temperature at the the condenser outlet increases since the mass flow and the temperature of the tap water are not varied
Summary
Along with the increasingly serious environmental pollution and scarce resources, people have paid more and more attention to energy conservation and emissions reduction [1,2]. The results of analysis and experiments showed that COP of the device can reach up to 4–5.5 in winter, twice as much as of an air source heat pump (ASHP) water heater. The energy saving effect of theinnew twice as much as of an air source heat pump (ASHP) water heater. The mathematical of the dual source compound parameters of air-water dual source compound heat exchanger on the energy saving efficiency the heat pump (SADSCHP) system was established. SADSCHP system, and the optimization scheme of the structure parameters under the simulating to study the effect of the structure parameters of air-water dual source compound heat exchanger on condition determined. Proposes a dual heat source heat pump bathroom unit with preheater, which is suitable for a family the organic combination of both technologies lacks meaningful exploration.
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