1. Project Summary

1.1 Project survey

1.2 Validating the air conditioning’s design plan

The owners requested a design of the building’s air conditioning system that would control and allocate the air conditioning system properly based on the laboratories’ usage, using minimal resources. 

Due to architectural considerations and design outlooks, the best choice would be to have a centralized air conditioning system. 

Looking at the vantage point of technological advancement, economic issues and after sales support and service, the best choice is GREE’s centralized air conditioning system (that will work well with the heating system already installed inside the building). Other advantages are:                 

1. Investment:  The engineers had already perforated holes along the walls inside the building and set-up the place in readiness for this type of air conditioning system. Thus, implementing the centralized air conditioning system will help minimize cost for the owners. 

2. System control: We take into account that having a centralized air conditioning system will make it easier to manage overall control with regards to temperature, date, power, and remote controlling. This also makes it more economic for the owners.  

3. Budget allocation for different areas: 34 air conditioning system units are to be installed, with each unit having its own power meter, thereby making it easy to check each area’s power usage, truly achieving “per area computation”. 

4. Calculating reliability: the GREE system is easy to control, has highly reliable postulates, and most of all, it takes into heart the considerations and concerns of the general population. 

1.3 Air conditioning system design parameter                  

Temperature design plan for summertime (inside the building)

All laboratories                                                                          25 – 27˚C
Computer lab                                                                            25 - 27˚C
Data reading room, on-duty staff room, service room       26 - 28˚C
Fire control room, communications room                           26 - 28˚C

 1.4 Design Specifications 

Ventilation and air adjustment regulation                     GBJ19–87 (v2001)
Fire control regulation                                                       GBJ16–87 (v2001)
Energy saving standard of residence building             GBJ01–602–97
Construction chart
Design files and documents provided by the owner

2. Choosing the Equipment 

2.1 Purpose and usage of the air conditioning system in different rooms

  There is no special requirement for the temperature inside the building. As for the temperature and units needed for outside the building, please refer to the table below:

 2.2 Air conditioning unit’s layout outside the building

 To optimize the current of air flowing in and out of the building, follow the diagram below.

 2.3 Fresh air blueprint

 Computer lab – 4, Physics lab – 3, holographic photo room has fix windows, design room has two units of YH-D1600 model fresh air ventilating system, L=16003/h, H=155Pa, N=1.4kW; One unit of YH-D1000 model fresh air ventilating system, L=10003/h, H=90Pa, N=0.4kW; the average heat recovery ratio of the fresh air ventilating system is 70%.          

The system is now up and running. Owner’s feedback is that system is excellent; the airflow is perfect; noise level is adequate; temperature control, etc.; all were achieved as per the design requirement.

The aspect ratio of the outside air conditioning units to inside air conditioning units of the GREE’s centralized air conditioning system is 1.3, it is the best way to save energy and resources according to the building’s structure. 

Having the institute’s operation in mind, with all air conditioning units running at the same time on a normal day to day operation, the best ratio of the outside air conditioning units to inside air conditioning units is 1:1, in this way, it satisfies all the lab and room usage requirements. After meeting the requirements, one of the most important element that the designer has to really think is how best to save energy resource. I think that is why the design is successful. 

During the designing and planning stage, GREE was new in the market so there were very limited air conditioning model units to choose from. Because of the limitation, we had to install several units in one area, which occupies a lot of space, not to mention the complexity of the pipes. It also makes it inconvenient for future repairs. We wasted a lot of energy on choosing the air conditioning units that would best fit the requirements of the institute.  

We are glad that at the end, we had chosen the right brand and model. The outcome is very positive. Of course, with the advent of new technologies, there are now more models to choose from. 

There were several national brands, which were taken into consideration. But GREE’s concentric spirit, excellent product quality and its commitment to user satisfaction, has made it easy for us to choose this brand.  

As an engineer, the economic, quality and design of a brand and model all had to be considered before presenting the options to the customer. 

After one year of operation, utilization, energy saving resource, manageability and all aspects of the air conditioning system is simply exceptional.