Central air-conditioning ventilation system should be more energy-saving

Source:Wasion group Author:admin Date:2012/8/6 11:05:19

As an indispensable part of modern hotels, central air-conditioning system directly affects customers’ satisfaction and its operation imposes direct impact on energy consumption of the whole hotel. So, here are some tips for energy conservation in using fresh air units and fancoils of the central air-conditioning system:

1. Besides time switches, fresh air units must have return air temperature control system.

To ensure indoor air quality, most hotels adopt fresh air units, which are used to supply cold/hot wind and exchange fresh air for a large area that the air-conditioning system covers. Their strengths include:

① Easy to maintain and repair;
② Convenient for central control to enable indoor air meet comfortable requirements rapidly.

Their disadvantages are:

① Fresh air units consume considerable power;
②There may be uneven temperatures within a short period of time.

The energy consumption problem can be tackled as follows:

① Adding temperature controllers in the air return place and change its switch from controlling electromagnetic valve to directly controlling the axial fan. In doing so, much power can be saved. For example, previously, two fresh air units (six 3KW motors) need to work 8 hours to maintain the temperature at 24℃, the water cut-off by the electromagnetic valve lasts 3 hours, and the two units consume 144 KWh electricity a day. If we use the temperature controller, the two fresh air units will only need 90 KWh electricity a day, 54KWh less than before. 19,710 KWh electricity will be saved each year.
②Using temperature controllers can also reduce indoor temperature changes and cold/hot losses.
③ Regulated operation and reasonable fresh air import are also a means of energy conservation and consumption reduction as it can effectively reduce cold/hot losses.
④ Regularly cleaning filters and fins can help reduce resistance to give full play of cold and heat and cut down the running time.

2. Energy-saving refurbishment of fan coils. Fan coils can also be improved in the same way to lower energy consumption (a 16W fan working 12 hours a day will consume 0.18 KWh electricity a day, 75.7 KWh a year). After the improvement, a fan can save 40 KWh power a year.

3. Suggestions for Installation and Maintenance of Condensed Water System

① Adverse slop of the drain pipe of condensed water must be avoided in the first place; otherwise, if the water cannot flow out, it will leak into the room, damaging equipment and leading to manpower and material wastes. So, condensed water pipes should be installed along with the direction of water flow and maintain certain slopes to ensure that the condensed water can flow out smoothly.
②Condensed water contains numerous bacteria and algae substances and with almost no pressure, it relies on certain slopes to flow, so these substances can easily block up the pipe. To address this problem, we can put a pill that eliminates bacteria and algae in the condensed water tray and add a simple filter in the drain pipe, which will effectively prevent bacteria breeding and pipe block-up.
③ The blocked main drain pipe of condensed water is an important reason why the water cannot flow out. A valve can be installed on the top and at the end of the main drain pipe. If the main drain pipe is blocked, we can slowly pour agents into the pipe from the upper end to prevent the water from flowing back to the tray, and turn down the valve at the lower end so that the water will flow down slowly. Repeatedly doing so will help dredge the main pipe. As science and technology advances, energy conservation will become our foremost concern. In terms of energy conservation in central air-conditioning system, we need to take overall energy consumption into consideration when designing the system; on the other hand, during its use and maintenance, we should manage the system as required so as to extend the service life of the system and reduce unnecessary wastes on goods, materials and energy.