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Application conditions of air-cooled heat pump type household central air-conditioning engineering system



The application conditions of air-cooled heat pump type household air-conditioning system are:

℃以上,机组蒸发温度 <-8 ℃,连续运作时间 <110h. ②冬季空气温度较低,即每年累计除霜时间 500 1000h ,每 kg 干空气累计除霜量 7 20kg. 对长江中下游地区此条件比较适宜。 ① The calculated temperature of the outdoor air conditioner in winter should be above -10 ℃, the unit's evaporation temperature is <-8 ℃, and the continuous operation time is <110h. ② The winter air temperature is low, that is, the cumulative defrost time is 500 to 1000h per year, and the cumulative dehumidification per kg of dry air The amount of frost is 7 to 20 kg. This condition is more suitable for the middle and lower reaches of the Yangtze River.

120 ㎡房间,机组功率采用 3kw 主机,以每增加 20 30 ㎡递增 0.75kw 计算,就可初步确定机组选用功率,其制冷能力 10.8 19.5kw ,热能力达 11.5 21.3kw For a room with a general use area of 100 to 120 square meters, the unit power is 3kw , and the calculation of the unit's selected power is based on an increase of 0.75kw for each additional 20 to 30 square meters . Its cooling capacity is 10.8 to 19.5kw and the heat capacity is 11.5 to 21.3kw .

即风冷热泵的传热量等于建筑物耗热量的室外计算温度值 ) 来选用热泵。 The key to the design of air-cooled heat pump air-conditioning system is to select the heat pump according to the optimal equilibrium point temperature ( that is, the heat transfer value of the air-cooled heat pump equals the outdoor calculated temperature value of the building's heat consumption ) . Whether to add auxiliary heat sources depends on the outdoor temperature in winter. If the outdoor temperature is below the equilibrium point, add an auxiliary heat source. The auxiliary heat source is generally an electric heater. 35 ℃,回水温度 12 ℃,出水温度 7 ; 制热工况为环境温度 7 ℃,回水温度 40 ℃,出水温度 45 ℃。 The refrigeration conditions are 35 ambient temperature , 12 return water temperature, and 7 outlet temperature . The heating conditions are 7 ambient temperature , 40 return water temperature, and 45 outlet water temperature .

Secondly, the key to design is anti-frost and defrosting. 常用的除霜方法是用电子膨胀阀来转换工况用热气反冲。 At present, the commonly used anti-frost method is to add an auxiliary outdoor heat exchanger ; the common defrosting method is to use an electronic expansion valve to change the operating conditions and use hot gas backlash. Because defrosting inevitably causes increased energy consumption and fluctuations in hot water temperature, it is necessary to properly remove the frost cycle.

In addition, the installation location and noise control of the unit must be considered during design. 4m/s ,排风不受阻挡,尤其是出风口的上方不应有阻挡物,否则会引起排风气流短路,热保护动作而停机。 Generally, the installation location of the unit should be unobstructed, the wind speed should be controlled at 3 ~ 4m / s , and the exhaust air should not be blocked, especially there should be no obstruction above the air outlet, otherwise it will cause short circuit of the exhaust air flow, thermal protection action and shutdown.


Related links: Dongguan air-conditioning purification project, Dongguan dust-free purification equipment, Changan central air-conditioning project, low-voltage power distribution project, Dongguan purification ventilation project, Dongguan dust-free purification project, hydropower installation project, Dongguan 100,000-level dust-free workshop, Dongguan City Power Xiang Air Conditioning Purification Engineering Co., Ltd.

Article source: http://jimesale.com Tan Yuming 13751461639


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