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Consider energy-saving ways in purification equipment


Consider energy-saving ways in purification equipment

Dongguan clean room often has high energy costs. The most important thing is to reduce the brake horsepower BHP and air conditioning load of the fan. If possible, the load of the clean room is not used under full load. The following are design guidelines and recommendations for reducing energy costs.

1.fan BHP

The design of the air circulation should be mentioned first. In Dongguan clean room HEPA-the distribution of filtered air can be done in several different ways. It is critical to consider the use of fans and return air paths. The effective fan BHP is mainly determined by the air volume and static pressure of the system. Air volume is determined by the required ventilation rate for a given cleanliness level. This air volume is generally fixed, and the measure to improve the effect is to obtain a lower total system static pressure.

In general, the most important design decision should be a positive or negative pressure ventilation system. This decision affects the choice of fan type, ceiling system, etc., and the energy efficiency often associated with circulating air. For energy efficiency, a negative pressure ventilation system is superior because it usually reaches a lower system static pressure. Negative pressure plenums can be built with limited piping and can regain static pressure in their air intake ducts, and fans can be arranged with ideal air inlets for ventilation systems. Large positive pressure systems usually require remotely fixed fans and throttling Baffle or higher pressure drop filter to ensure HEPA pressure delivery.

The second aspect should address the distribution of air-conditioning air. If possible, the circulating air processing device should be separated from the air-conditioning air processing device. The static pressure of the cooling and heating coils will not affect the large amount of circulating air.

The choice of form and number of fans will also affect the energy efficiency of the clean room. Use a larger fan impeller size within a reasonable range. A fan with a larger impeller size can produce the maximum amount of air at a specified horsepower. Choosing a larger fan is more effective and can reduce the total number of fans, but it is necessary to take into account regional restrictions, cost effectiveness and controllability of the clean room.

2. Air conditioning

Air-conditioning systems are critical to cleanrooms, and factors such as energy efficiency, controllability, reliability, and cost and effectiveness must be considered. Dust-free workshops usually need to run the air conditioner continuously every year. In cold seasons, if the clean room only needs hot and cold comfort (no humidity control), a fuel saver cycle can be used.

Fuel economizers cannot be used in dust-free workshops that control humidity, because the untreated air that directly enters from the outside may cause a high humidity load on the space, and the humidity cannot be precisely controlled. However, indirect methods can still be used to take advantage of external cooling temperatures, such as air-to-air or air-to-water heat exchangers to achieve the advantages of effective cooling and energy savings. For the winter ambient temperature of the dust-free workshop with a high sensible heat load, the use of an indirect recovery device has great appeal.

The choice of purification plant equipment has a relatively large impact on the efficiency of air conditioning. The key lies in the balance of initial investment costs to KW / t. A balance must be reached between system efficiency and initial investment costs. Generally speaking, if the efficiency is better, the initial investment cost will be higher. In larger systems, you should consider choosing a centralized device system with a higher cost effect.

3. Heating and humidification

Most systems require heating, but not completely, and cleanrooms have the need to overcome the highest loads in winter or reheat. Important heating loads are:

(1) Fresh air. The fresh air must be heated to prevent the space from becoming too cold.
(2) Plant load. It refers to the conductive load on walls, roofs, etc. in winter, although it is quite small, it is best calculated by the ASHRAE method. Generally, an approximate value can be used for calculation.
(3) Reheat. If the maximum load dehumidification selected for air volume and temperature does not match the required sensible cooling, reheating is required.
(4) Humidification. Energy is used to generate steam to humidify.

Dongguan clean room For large clean room installations, the heating method bears the main energy cost. Large installations require large amounts of fresh air and heavy heating. The simplest heating method is the use of resistance heaters; however, it is usually the most expensive for producing energy per unit of heat. For large installations, production from natural gas or crude oil-fired boilers is the most efficient heating method.

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