2.0            Findings

 

2.1  Information of Multi-split Unit Air-conditioner Systems

 

2.1.1        Nominal Cooling Capacity (1 outdoor unit with 4 indoor units)

 

Manufacturer	Model		Nominal Cooling Capacity
	Outdoor	Indoor	Total Capacity(KW)	Individual (KW)	Total BTU/h
Carrier	38ACE0025	42ACE0025	7.00	1.76	24,000
Mitsubishi	MXY-26SV	MSXY-9SV	7.50	1.88	25,600
Fujitsu	AOY24AM4	ASY9ANx4	7.04	1.76	24,000
McQuay	MMSH66K66A	MWMS010Fx4	7.50	1.88	25,600

 

Figure 1-1             Table show the nominal cooling Capacity (Btu/h) of multi-split air-

                             conditioner systems on the different manufacturers and different models.

 

                       

 

Figure 1-2             The bar chart show the total capacity and individual capacity of the ai-

                                                                conditional system from different manufacturer.

 

2.1.1.1              From the bar chart above, it shows that the Mitsubishi and McQuay multi-split air conditioner system has 6.67% more total cooling capacity than Carrier and Fujitsu air conditioner system.  Both also has 6.38% more than Carrier and Fujitsu air conditioner system.  The results showing that the Mitsubishi and McQuay air-conditional system has better efficiency of the nominal cooling capacity. That means they can provide sufficient cooling air than other systems.  

 

 

 Figure 1-3            Shown the total British Thermal Unit per hour of  Carrier, Mitsubishi,

                                                                Fujitsu and McQuay Multi-split air-conditional system.

 

2.1.1.2              From the bar chart (Figure 1-3), we have know that all of them   

                              can provide at least 24,000 BTU/h, Mitsubishi and McQuay multi-

                              split air-conditional system are 6.25% more than the other two,

                              they provide up to 25,600 BTU/h.  That means both can provide

                              sufficient cooling air than other systems.

 

2.1.1.2.1           Although horse power is commonly used to indicate the capacity of an air conditioner, the scientific measure is BTU/HR (British Thermal Unit per hour). One BTU/HR is the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit. The conversion from horse power to BTU/HR is as follows:

 

Cooling Capacity
Horse Power	BTU/HR
1	9,000
1.5	12,000
2	18,000
2.5	24,000

 

 

 

 

 

 

 

 

            Figure 1-4             Table shwon conversion of horse power to BTU/h.

 

 

2.1.2        Air Flow Rate (1 outdoor unit with 4 indoor units)

 

 

Figure 1-5             Table showing the multi-split air-conditioner systems air flow rate (cfm),

on the different manufacturers and different models.

 

2.1.2.1  Properly sized equipment will operate more efficiently, dehumidify better in the summer, last longer and provide you with a more comfortable indoor environment to live in. To determine what size of air-conditioner you need for your house we must first determine the cooling loads on the house.  The cooling airflow needed in Cubic Feet Per Minute (Cfm) to allow the system to operate at rated efficiency.

 

 

Figure 1-6             Chart show the multi-split air-conditioner systems’s air flow rate (cfm),

 on the different manufacturers and different models.

 

2.1.2.2 The above bar chart shows that the Mitsubishi multi-split air conditioner system, has 3.23% air flow rate higher than McQuay air conditioner system, 11.11% higher than Carrier air conditioner system, and 15.77% higher than Fujitsu  air conditioner system. Thus in the selection of low rate, the Mitsubishi system tends to be the leading in this field.

 

 

2.1.3    Power Consumption

           

Manufacturer	Model		Power Consumption (KW)
	Outdoor	Indoor
Carrier	38ACE0025	42ACE0025	2.44
Mitsubishi	MXY-26SV	MSXY-9SV	2.26
Fujitsu	AOY24AM4	ASY9ANx4	2.44
McQuay	MMSH66K66A	MWMS010Fx4	2.36

 

Figure 1-7             Table showing the multi-split air-conditioner systems power consumption (KW),

 on the different manufacturers and different models.

 

 

                                              Figure 1-8 – Bar chart showing the total power consumption in KW.

 

2.1.3.1      The energy saving is considered how much of power    

    consumption, that air-conditioner system is draw up 

    during operation period. If the system power  

    consumption is higher, then the extra energy is used and

    extra costs has to be paid.

 

2.1.3.2      The above bar chart shows that the Fujitsu multi-split air  

conditioner system, and the Carrier multi-split air conditioner system is used 7.4% of energy more than Mitsubishi air conditioner system, 3.3% higher than McQuay air conditioner system.  This is showing that the Fujitsu system required more energy to perform operation.                                                                           

 

2.1.3.3      Mitsubishi air conditioner system is more energy saving 

    than others.  It has the lowest power consumption.

 

2.1.4    Operation Noise

           

Manufacturer	Model		Noise Level           (dBA)
	Outdoor	Indoor
Carrier	38ACE0025	42ACE0025	45
Mitsubishi	MXY-26SV	MSXY-9SV	35
Fujitsu	AOY24AM4	ASY9ANx4	52
McQuay	MMSH66K66A	MWMS010Fx4	56

 

                                     Figure 1-9    Table showing the multi-split air-conditioner systems’s operation noise                       

                                                                        in (db) on the different manufacturers and different models.

 

2.1.4.1          During operation, air-conditioner system will produce noise.

This noise may cause unconformable living environment. For the level of noise

is measuring by a unit call decibel (dBA).

 

2.1.4.2          The above table shows that the Mitsubishi air conditioner system is the most quiet than others.  It is less than McQuay air conditioner system by 21 db, less than Fujitsu air conditioner system by 17 db, and less than Carrier air conditioner system by 10 db.

 

2.1.4.3          The Mitsubishi MSXY series units work silently to create a comfortable environment is because of quality engineering and advanced features that provide the lowest noise levels.

 

Place	Empty Recording Studio	Empty Concert Hall	Quiet Library
Noise level    (dBA)	20	30	40

 

Figure 1-10    Table showing the noise level in 3 different places which  

                       have a quiet environment.

 

2.1.5    Total Current

           

 

Figure 1-11          Table showing the multi-split air-conditioner systems running current Amp

on the different manufacturers and different models.

                       

2.1.5.1          From the table we known that Mitsubishi air conditioner

                system have the highest running current.  It is more than    

                Carrier and Fujitsu air conditioner system 0.31 Amp, and        

                0.71 Amp more than McQuay air conditioner system.

 

2.1.5.2          McQuay air conditioner system have the lowest current rate 

                when it operate.  This mean that the system would not be      

                over heat easily than others air conditioner system. 

 

 

Figure 1-12          Bar chart showing the multi-split air-conditioner systems 

                                                                              running current Amp on the different manufacturers and 

                                                                             different models.

 

 

2.1.6    Dimensions

                       

2.1.6.1    Indoor unit

 

 

                                    Figure 1-13          Table shown the physical dimension of the indoor unit from 

                                                                                different manufacturer.

 

 

 

                                    Figure 1-14          Bar chart shown the physical dimension of the indoor unit       

                                                                                from different manufacturer.

               

                                    2.1.6.2  Outdoor unit

 

 

                                    Figure 1-15          Table shown the physical dimension of the outdoor unit from 

                                                                                different manufacturer.

 

                       

Figure 1-16          Bar chart shown the physical dimension of the outdoor unit       

                                                                                 from different manufacturer.

 

 

2.1.7    Price

           

 

Figure 1-17   Table shown the price of the multi-split air-conditioner systems, 

                                                        on the different manufacturers and different models.

 

2.1.7.1    The price is a very important factor when people want to 

                                      purchase a product.  They will look into all the necessary 

                                      operation information and the prices before they purchase 

                                      that product.

 

2.1.7.2    The table above shown that the price of the four

                                                  manufacturer are different between S$11 to S$438.    

 

2.1.7.3    Mitsubishi air conditioner system have the most 

  reasonable price, which is S$ 5,350.00.  Compare to

  Fujitsu air conditioner system which is S$ 5,788.00, it is

  cheaper than it S$438.00.

 

Figure 1-18   Bar chart shown the price of the multi-split air-conditioner systems,

        on the different manufacturers and different models.

 

 

2.1.8        Air filter

 

2.1.8.1  Carrier air conditioner system

 

2.1.8.1.1        It is fitted with double effect filter (air purifying 

                  and deodorizing filter) to remove odours as it  

                  purifies the air.

 

2.1.8.1.2    Its electrostatic filter remove micro-particle 

                                                                  including tobacco smoke, viruses and pollen 

                                                                  while the activated charcoal absorbs unpleasant

                                                                  odours to ensure a cleaner, fresher-smelling 

                                                                  environment.

 

2.1.8.1.2        Picture not available.

 

2.1.8.2  Mitsubishi air conditioner system

 

2.1.8.2.1        The MSXY Series features both deodorizing and air-cleaning filters as standard equipment.

 

2.1.8.2.2        These filters work together to effectively remove dust particles, germs and other contaminants from the air to keep it as fresh and pure as possible.

 

2.1.8.2.3        The deodorizing filter should be soaked in water every two weeks to maintain its efficiency and replaced once a year.

 

2.1.8.2.4        Under normal operating conditions, the air-cleaning filter should be replaced every four months.       

                                                     

                           

 

                                     Picture 1-1  Deodorizing and Air-Cleaning Filters

 

2.1.8.3  Fujitsu air conditioner system

 

2.1.8.3.1        The Air Purifying Filter catch various kinds of dust undetectable to the eye, mites, pollen, and cigarette smoke, as well as other tiny particles down to 0.01mm.

 

 

 

                                          Picture 1-2   Fujitsu filtration process

 

2.1.8.4  McQuay air conditioner system

 

2.1.8.4.1        Three stage air purifying filters.

 

 

Picture 1-3  Air Purifying Filters from McQuay

 

2.1.8.4.2        Cleaner Air

 

2.1.8.4.2.1  The anti-fungus pre-filter and blower removes comparatively large particles such as dust from the air to ensure the cleanliness of the cool air and prevert fungus and bacteria from breeding.

 

2.1.8.4.3        Purer Air

 

2.1.8.4.3.1  The electrostatic filter then further enhances the purity of the air by removing microscopic air particles as small s 0.01 micron.

 

2.1.8.4.4        Odourless Air

 

2.1.8.4.4.1  The deodorising filter removes any unwanted odours and thus creates a healthy and pleasant living environment.

 

2.1.8.4.5        All filters feature a One-Touch design that 

                  allows them to be conveniently slid out for                   

                  cleaning.

 

 

Picture 1-4    Two filter from McQuay

 

 

2.1.9        Compressor

 

2.1.9.1  Carrier air conditioner system

 

2.1.9.1.1        The newly designed twin-rotary compressor has two cylinders (lower and upper) which provide more stable and noiseless operation with high efficiency in the wide performance range.

 

2.1.9.1.2        Vibrations have been greatly reduced by balanced compression over the range from low to high revolving speeds.

 

2.1.9.1.3        Optimum design of mufflers, valves, frame-fixing system have reduced noise to a great extent.

 

2.1.9.1.4        Picture not available.

 

2.1.9.2  Mitsubishi air conditioner system

 

2.1.9.2.1        The MXY Series outdoor unit features a twin rotary compressor that provides balanced rotation.

 

2.1.9.2.2        The centrifugal force of one roller is counterbalanced by the other.

 

2.1.9.2.3        For significanly reduced vibration and noise.

 

2.1.9.2.4        It’s exactly this kind of technology that makes outdoor units so quiet.

 

 

                                                            Picture 1-5  Mitsubishi Twin-Rotary Compressor

 

2.1.9.3  Fujitsu air conditioner system

 

2.1.9.3.1        This Compressor provide a quiet and efficient performance.

 

2.1.9.3.2        It work at economical rate.

 

2.1.9.3.3        Picture not available.

 

2.1.9.4  McQuay air conditioner system

 

2.1.9.4.1        High efficiency rotary compressor.

 

2.1.9.4.2        Advanced rotary compressor is designed to work more quietly and to deliver high EER (Energy Efficiency Ratio) to provide energy saving.

 

 

  Picture 1-6  McQuay compressor