WESTPOINT Commercial Air conditioners INVERTER VRF COMMERCIAL A/C

Contents

1 2

What’s WMV & VRF?

Residential central air AC

3

WMV energy consumption analysis

4

Digital scroll VS Inverter

Part

Ⅰ

GMV & VRF



Review of VRF(VRV)

V ariable R efrigerant F low



Developing from traditional split type air conditioner.



Consist of outdoor units, indoor units, Refnet, controller etc.



One outdoor unit can drive at least 16 indoor units, with which different capacity and appearance.



Applied intensively in office building, hotel, high grade department, villa etc.

Introduction of GMV W – WESTPOINT M – Multi-connected (Max. 1:32) V – VRF system

2 ways to achieve VRV

Inverter

Originating from Japan, frequency conversion;

Electrical

adjustment; Rotor Reluctance motor

Digital scroll

Technology from Copeland;

Mechanic

adjustment;

E.G. WMV in office building

Combination with Outdoor fresh air processor

Part

Ⅱ

Residential central air conditioner



When central AC enter residential area… Virtues of Central Air Conditioner

 Central air conditioner-centralized processing 、 distributing ；  Baring comparatively higher EER, more energy saving;

Residential Central Air Conditioner

 More comfortable, lower noise, less vibration, more accurate adjustment;

Types of residential central AC

   Duct type Mini chiller WMV

Family of residential central AC

• • • •

1. Duct type Low initial investment; Indoor air quality improve by introduction of fresh air Require enough height to layout the duct; Individual adjustment for single room not available

Mini Chiller-Hydraulic system 2. Mini Chiller

•

All-Water system (water or ethylene alcohol);

•

Adopt Fan coils as terminals, space saving;

•

Without fresh air introduction;

•

Individual control for each room available;

E.G. WMV in detached house 3. WMV

•

Energy-saving;

•

Low initial investment;

•

Comfortable & Accurate;

•

Individual control;

Figure: Ratio of VRV application in Japan Old building redecoration New facility

Part

Ⅲ

WMV energy saving analysis

New orientation in working concept Adopting digital scroll compressor Core factors Saving energy Using refrigerant as heat transfer medium Sophisticated controlling network Combination with heat recovery processor

1. New orientation in designing concept Traditional designing base on the most sever outdoor condition.

Ratio of cooling load throughout one year % Cooling load (%) 100 75 Working time (%) 1 42 Cooling load (%) 50 25 Working time (%) 45 12 Data originate: American Society of Heating, Refrigerating and Air-conditioning Engineers. (ASHRAE) Peak of EER/COP sets at partial load. (around 40% of the full load)

2. Adopt digital scroll compressor



Traditional residential split type AC adopts Rotary type compressor;



The efficiency of Scroll type compressor is higher than Rotary Reciprocal type compressor; type or



Energy consumption can be reduced by 10-15% compared with the reciprocal type at the same capability; Comparing Items EER Volumetric efficiency Adiabatic efficiency Num. of part in compression chamber Weight ratio Machining precision Output power Scroll type 2.9

0.99

0.98

1 Rotary type Reciprocal type 2.4~2.6

0.94

0.93

3 2.2~2.6

0.7

0.88

7 0.8

1~3 1~10 0.8

3 0.4~1 1.0

10~30 1~10

Core component of digital scroll Variable Capacity Adjustment is achieved by PWM (Pulse-Width Modulation) valve “Fixed Scroll” Discharge Pipe by-pass pipe Suction Pipe Orbit Scroll Gap: 1mm between two scrolls!

Loading Idling

Adjust capability output



Pulse-width: Maintain a balance between Demanding and Providing;



“Digital”: loading-100%( 1 ), while Idling-0%( 0 ), forming the sequence 0 1 0 1 0 1 0 1 0 1 0 1 0 1 …..

Digital Multi Unit Inverter Unit Capacity Demanded

3. Using refrigerant as heat transfer medium



In GMV, heat transferred via refrigerant directly;



The heat amount transferred can be 10 times of those transferred by water, and 20 times via air.



Comparing: Property of heat transfer medium Types of medium Water Air Refrigerant Utilized heat

sensible heat sensible heat evaporating latent heat

Transfer amount

20.1kJ/kg ( △ t=5 ℃ ) 10.1kJ/kg ( △ t=10 ℃ ) 206kJ/kg

Energy consumption (transfer 120 kW cool load)

4.8

7.5

2.6

54% of those transfer via water; 35% of those transfer via air;

4. Sophisticated intelligent controlling



Controlling Object



Forming the network



Sensors (temperature, pressure);



Throttling devices (electrical expansion valves, pore plates);



Advanced logical algorism;



Basic principle

5. Combination with heat recovery processor



To improve the IAQ, people can open the windows sometimes, or install a ventilating fan connect to outside;



But cooling load would rise, and unfiltered air with instable and unreliable factor would penetrate in.



The Fresh Air Heat-Recovery System can solve this problem

•

Introduce more filtered fresh air into the room;

•

Recycle heat or cooling; (efficiency 75%)

•

Reduce the amount of poisonous released from the building material;

Exhaust air The air route inside the system 1. Excellent water absorbability exchanging efficiency reaches 75%; 2. Super fire-retardant Safe and reliable 3. Mildew-proof, clean & healthy.

Returning air of indoor Suction of outdoor air Cooled fresh air introduced in Compared to traditional way of ventilation, Fresh air processor reduces 28% of energy consumption!

Part

Ⅳ

Digital scroll VS Inverter Comparing items Digital scroll Inverter Digital Multi Unit Capability adjustment Inverter Unit Common Inverter comp. Capacity Demanded Digital only Digital & common parallel connection SEER Electromagnetic interference Can be omitted Capacity Shift Shift to 100% capability immediately By-pass of refrigerant No need Sever disturbance, expensive electromagnetic-proof apparatus must be installed; Must have procedure of frequency conversion Have to install

Summary



WMV can be applied intensively in office building, hotel, luxury department, villa, etc.



Enjoy a high EER/COP under partial load;



Combination with fresh air processor, can improve IAQ & saving energy (up to 30%);



Digital scroll type VRF is more reliable and flexible than Inverter.