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Environmental and economical analyses of transcritical CO2 heat pump combined with direct dedicated mechanical subcooling (DMS) for space heating in China
- Dai, Baomin, Qi, Haifeng, Liu, Shengchun, Zhong, Zhifeng, Li, Hailong, Song, Mengjie, Ma, Muyu, Sun, Zhili
- Energy conversion and management 2019 v.198 pp. 111317
- capital, carbon dioxide, coal, electricity costs, emissions, heat, heat pumps, heat treatment, life cycle costing, models, operating costs, pollution, prices, primary energy, temperature, China
- An environmental and economical assessment model is developed, in order to evaluate the performances of transcritical CO₂ heat pump system with dedicated mechanical subcooling (CO₂ HPDMS). Introducing DMS to traditional CO₂ HP system is an efficient method to reduce the primary energy consumption, which can be further decreased by using small temperature difference fan-coil unit (STD-FCU) as heating terminal. Using CO₂ heat pump system for space heating is an environmentally-friendly heating method. The corresponding pollution emissions are only inferior to those of the wall hanging gas heater. The initial capital cost and operating cost of CO₂ HPDMS system are both lower than those of CO₂ HPBASE system, and the CO₂ compressor cost accounts for about 80% of the overall initial capital cost. In contrast to other traditional heating methods, the payback periods of CO₂ HPDMS system are not more than 9 years in most cases. If the CO₂ compressor and electricity price are reduced by 20% and 28.79% respectively, the life cycle cost of CO₂ HPDMS will be competitive to that of coal-fired boiler. In China, it is a promising way to adopt CO₂ HPDMS for space heating in the near future with the assistant of electricity price subsidy and compressor price reduction.