【 Weak current College 】 heating and air-conditioning system hydraulic balance technology application---Power By 【 China power house network 】

First, energy-saving hydraulic balancing technology is and heating (cold) quality of critical

In the heating and air conditioning system, due to various reasons, most of the transmission and distribution loop and thermal (cold) the source unit (parallel) loop hydraulic imbalance exists, flows through the user and machine design flow of traffic and do not match. Coupled with the relatively large pump selection, pump running inappropriate working point, leading to the water system is in high flow, low temperature operating conditions, pumping efficiency low, low heat transfer efficiency. And the user does not agree, at room temperature near thermal (cold) source Office room temperature is high (high), thermal (cold) source Office room temperature too low (high). On the source of thermal (cold), the unit does not meet its rated output, so that the actual running of the unit number exceeds the number of load requirements. All of these reasons, resulting in a high energy, heating (cold) poor quality.

It is measured and surveys, current heating system prevailing in the following issues:

Water system is in high flow, small temperature difference conditions, water transfer coefficients cannot reach. According to a survey of ten heating community, theoretical average water transfer coefficients, but the actual 375 is equipped with pump nameplate shaft power calculation of water transfer coefficients only 154. The civil construction energy conservation design standards (existing building) (JGJ26-86) requirements for design selection pump nameplate shaft power calculated water transfer coefficient should be no less than the theoretical water 0.6 times, i.e. transfer coefficient should be not less than 0.6x375 = 225, clearly does not meet the standard of value.

Each t/h boilers can provide heating area not to be able to provide half of the area. According to the national real estate system heating cooperation network in 1989 to the "North" in 10cities real estate system since the tube boiler house sample survey data show that every t/h boiler heating area with an average of only 4008 m 2, the boiler is in operation under low load.

Heating coal consumption quantity indicators. Most cities each heating season of coal consumption is 32-46Kg grams/m 2. Converted to the boiler, operating efficiency and heating pipelines conveying efficiency only 45 per cent.

The room temperature. The present energy consumption and climate conditions similar to those of the developed countries, China's energy consumption are 1-2 times the heat supply quality, according to the survey, near the ring road at room temperature up to 26-28 ° c (or higher), negative loop only 11-13 ° c (or lower).

Similarly, the air conditioning system also exists in high flow, temperature, do not have seriously affected the cooling quality.

For the above problem, if water balance, unit operation at its rated water flow, the anomaly will be improved. Visible, solving problems is energy-saving hydraulic balance and improve the quality of heating (cold) are first and foremost.

II. application of hydraulic balancing technology

In order to achieve the balance of the water system, China Academy of building air-conditioning Institute in absorption, assimilation balancing technology, combined with the domestic situation in 1986, and bear the original National Commission issued the "development" in the subject balance valve, balance valve developed by its dedicated smart instruments, solve hardware and supporting software technology.

More than ten years, the air conditioning is on the hydraulic balance areas made extensive and effective work. Starting from system diagnosis, by applying the firm has developed a simulation analysis of software problems on systems for analysis, has been on many different scales of heating the water balance of the community, for the user to resolve a long-term haunting challenges, namely to improve the quality of the inhabitants of the district heating, and saving energy, reconstruction project achieved significant social, economic and environmental benefits.

Hydraulic balancing technology is not limited to the heating system, air conditioning areas have also been widely used. Air conditioning in the use of its technical superiority, the Beijing International Hotel, Beijing International Club, the people's Hall, Kempinski Hotel, air conditioning system for test and diagnostic technology services that help owners solve a long-standing problem of air-conditioning system with satisfactory results.

III. concluding remarks

At present, China's heating and cooling system for hydraulic offset in endemic phenomenon, not only cause cooling, heating of poor quality, and increased energy consumption. Application of hydraulic balancing technology is to improve the heating and air-conditioning system status and promotion of energy saving is an effective way, it's less investment, quick, has significant economic and social benefits.