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Case study of “coal to electricity” in Shunyi District, Beijing

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Beginning in the heating season in 2015, all the northern regions have raised smog warnings, which has brought many inconveniences to people's lives. In the past, London and other big cities in the UK were also smoggy, and industrial and household coal, trains and other transportation coal were important reasons. Today's China faces similar problems, and coal accounts for a high proportion of total energy use. For many years, the traditional form of heating in winter has consumed a lot of coal, causing serious pollution to the atmosphere.
 In recent years, with the strong support of national policies, Beijing's “coal to electricity” promotion of clean energy heating and “Beijing Clean Air Action Plan 2013-2017” have been rapidly implemented, aiming to significantly reduce coal consumption and reduce PM2. 5 emissions. The low temperature air source heat pump unit plays a major role in the operation due to its excellent performance: high efficiency, energy saving, safety, environmental protection and pollution-free discharge.
 So how can the low-temperature air source heat pump adapt to the local environment, how can it be efficient, energy-saving, safe and reliable, how can it be popularized by the people once it is promoted, and how can it completely replace the clean heating energy of coal-fired boilers?
The following is a case of a household coal-to-electricity heating renovation project in Shunyi District, Beijing.
Project information:
A household in Yanjiaying Village, Gaoliying Town, Shunyi District, Beijing, is a one-storey bungalow with a building area of ​​180 m2 and an air-conditioning area of ​​150 m2.
Customer requirements:
The use of fan coils for cooling requires a room temperature of 26 ° C in summer and a floor heating for heating. The indoor temperature in winter is required to reach 20 ° C.
Design Basis:
  (1) According to the project overview and requirements;
  (2) (Building Water Supply and Drainage Design Manual);
  (3) "Basic Terminology Standard for Water Supply and Drainage Design" (GBJ125-89);
  (4) "Code for Construction and Acceptance of Installation of Mechanical and Electrical Equipment" (TJ231);
  (5) "Code for construction and acceptance of low electrical appliances for electrical installation engineering" (GB50254);
  (6) "Quality Inspection and Evaluation Standard for Automation Instrument Installation Engineering" (GBJI31-90);
  (7) (Practical Heating and Air Conditioning Design Manual);
  (8) (Technical measures for air conditioning design of civil buildings);
  (9) Performance of the MACON air source heat pump unit;
  (10) Other relevant norms and measures currently in use in the country.
The function chambers are cooled and heat loaded, and the fan coils are configured according to the cooling load.
At the end of summer, the fan coil is used for cooling. The design cold index is 105w/m2, and the total design cooling load is 16.8kw. Considering the room function distribution and cost investment of the building, the equipment selection factor is 0.85, which is 14.3kw. The heating end of the winter is heated by floor heating. The design heat index is 55w/m2, and the total design heat load is 8.8kw.
Host selection:
Combined with the architectural characteristics and climatic conditions, the air-conditioning cold and heat source of this project uses a low-temperature air-energy heat pump, and is equipped with a model MACRW060ZA/S(E) Meiken low-temperature air-capable air-cooling unit. MACRW060ZA/S(E) Meiken low-temperature air-energy air-cooled unit has a rated cooling capacity of 15kw, a rated heating capacity of 16.5kw and a rated input power of 5.26kw.
The project was completed before the heating season in 2015. After the renovation, the Meike low-temperature air-energy air-cooling unit was used as the cold and heat source. The unit's overall design was compact, and the unit was directly placed outside without a special machine room. All the ends are hidden in the decoration, saving indoor space and being beautiful.
System schematic: