Abstract
This paper proposes a natural gas assisted solar low-concentrating photovoltaic/thermal trigeneration (NG-LCPV/T-TG) system. This novel system simultaneously provides electrical, thermal and cooling energy to the user. The design and dynamic simulation performance of the NG-LCPV/T-TG system is completed using Transient System Simulation (TRNSYS) software. The results show that the system can satisfy the requirements of the cooling and heating load. The proposed system maintains the experimental room temperature at about 25 °C under the cooling mode, at about 20 °C under the heating mode. The electrical and thermal energy produced by the low-concentrating photovoltaic/thermal (LCPV/T) system are 3819 kWh and 18,374 kWh. Meanwhile, the maximum coefficient of performance (COP) of the low temperature heat pump (LHP), high temperature heat pump (HHP) and chiller are 5, 2.2 and 0.6, respectively. This proposed system realizes the coupling of natural gas and solar energy in a building. In summary, this trigeneration system is feasible and it promotes the implementation of building integrated high-efficiency energy supply system.
Highlights
There is no doubt that China is the country with the highest energy consumption in the world.Unlike other countries with slow energy growth, China’s energy growth accelerated in 2019 [1].Within this growth, the proportion of coal consumption showed a downward trend, while the total consumption of renewable energy continued to increase [2].the utilization of renewable energy was restricted by environmental and technological factors
Natural gas has been applied in distributed systems complementary to solar energy, such as the single-effect absorption air-conditioning system that used solar energy and natural gas as heat sources to provide heating and cooling to villas [20], the solar-natural gas household heating system that formed by the solar hot water system and natural gas wall-hung boiler system combined in series [21], and power generation system of solar energy combined with natural gas [22]
The electricity produced by the low-concentrating photovoltaic/thermal (LCPV/T) module is stored in the accumulator, which is used by the user or connected to the grid
Summary
There is no doubt that China is the country with the highest energy consumption in the world. Compared with traditional solar cooling system which used a reversible air-water heat pump as a cold or heat source, the overall efficiency and economic efficiency of this system were improved due to the reduction of electricity consumption for heat rejection. Natural gas has been applied in distributed systems complementary to solar energy, such as the single-effect absorption air-conditioning system that used solar energy and natural gas as heat sources to provide heating and cooling to villas [20], the solar-natural gas household heating system that formed by the solar hot water system and natural gas wall-hung boiler system combined in series [21], and power generation system of solar energy combined with natural gas [22]. The electrical and thermal energy are produced by the LCPV/T system This system uses different heat pumps as a primary auxiliary device and natural gas heater as a secondary auxiliary device. This research has a crucial effect on the promoting the comprehensive utilization of traditional energy and renewable energy
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