暖通空调设计--暖通英才网(国外英文资料).doc(2)

It should be pointed out that the use of electric heating has also been banned, the State Planning Commission and the National Tourism Administration of the resources have a text No。 1104, expressly provides: "no winter direct use of electricity as an air-conditioning heat source for heating。""。 Now, due to the trend of the formation of electricity is not very tight (summer electricity peak, some areas still have gaps), the power sector to promote electric heating boilers, it will not be implemented。

In fact, China's per capita electricity consumption is still very low, developed countries have also banned the electric heating。 TheTwo 、 circulating water pump and fanTheThe selection and configuration of pumps and fans are indispensable to the transportation of the cold (hot) bodies, and the success or failure of the engineering design is very important。 TheAs for water pumps, the following problems often occur。 The1, pump head is too big, some only need 28 ~ 32m water column, selected 40 ~ 50m water column pump。

The extra lift, one is on the valve to the consumption of energy consumption, the proportion of individual projects, even up to 70%; two is converted into traffic, such as a project, as the flow increases, the flow rate increases, the entrance of the boiler equipment configuration had small caliber (25 DEG C temperature according to the original traffic allocation) caused。 The vibration of boiler equipment。 Is it safer to choose a larger pump head? It's not。 If the flow limiting valve, electrical design nor overcurrent protection is not installed, it is possible to burn the motor; if the electrical design overcurrent protection, will be fever, the pump motor current increases, while the situation does not start。

The cause of the pump head selected is obviously too large, not afraid of the necessary hydraulic calculation and without clear aims is the main reason, I suggest, or to carry out hydraulic computation honestly, do it with the accumulation of experience。 The2, hot and cold circulating water pump is not divided。 TheProject often see the cold and hot circulating water pump is not set up, some because to accommodate the engine room area is small, and some are considered improper。 Known, the temperature difference between supply and return when refrigeration is generally 5 DEG C, heating time is generally 10 degrees, but also to the general cold winter and hot summer, the winter heating load than summer cooling load of Nanjing area, generally small, the former for the latter 60 ~ 80%。

That is to say, the amount of circulating water in winter is 0。3 to 0。4 times of that in summer, and the hydraulic loss is only 9 to 16% of the cooling condition, and the power consumption is only 2。7 ~ 6。4% of the cooling condition。 Therefore, if the hot and cold circulating water pump is not divided, it will lead to waste of energy consumption in winter, resulting in large flow and small temperature difference operation。3, a machine configuration problem of the pumpThe utility model has the advantages that the circulating water pump can be mutually reserved, and the pipeline system is simple。

The drawback is that the operation is cumbersome, prone to errors, and the electrical pairing design is more complex。A machine can avoid the pump running one or 2 units, not turn off the corresponding valve caused by water flow bypass, the unit COP decreased, also makes the pump operating point deviates from the rated point, the increase of power consumption; the electrical control design is convenient; the operator can avoid frequent people working on or off or host the cooling tower entrance valve, to part load operation。

Such as linkage electric valve, the investment is high, the valve is bad, the system is not reliable。In addition, more than one pump in parallel, the choice of pumps in accordance with the characteristics of the curve for parallel analysis,And return air above a height of not more than 0 m above the ground 5m (i。e。 below the operating table below the air inlet height), the ground is not less than 0。 1m, the air inlet velocity is less than 2m/s。 At the same time, the air return should be vertical one hundred pages, reduce ash accumulation, and the return air port must be equipped with filter layer (damping layer) and medium efficiency filter。

The4, for clean operation room, humidifier humidification water should meet the requirements of drinking water, direct use of dry steam humidifier or tap water humidification is not required, this is generally ignored。 TheFour, others1。 Swimming pool ventilationAbout swimming pool ventilation, I think it needs to be improved。 At present, small for leisure and fitness, swimming pool project is more, ventilation and air conditioning system design is the key to solve the "hot, dew,mildew"暖通英才网首页, "the main reason hot, dew, mildew 'is water and wet the large scattered wet, the measures to strengthen the building envelope insulation treatment or other measures as to the envelope surface, blow drying, heating pipes, so that the surface temperature of envelope is higher than the dew point is the use of indoor ventilation, indoor and outdoor swimming pool will be high humidity difference, the moisture content of the indoor air humidity will be exhausted to the outside, in the outdoor air into the interior, to eliminate indoor large amounts of moisture。

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