ENERGY SAVING IN HVAC INDUSTRY

HVAC Accounts for 40-50% of a buildings load

Building requirements Cooling – air-conditioning Heating – air-conditioning Hot water – potable, showers, basins, washing Refrigeration , freezers, fridges etc. Fresh air –New Sans regulation

Eskom, load shedding, who is responsible?

As we live with Eskom and loading shedding, business and people are

scrabbling for solutions.

PV systems, energy efficiency, capital costs, service /maintenance, Return on

investments are all factors to consider.

With the draw of power on a building being 40-50% the HVAC industry is

responsible to assist clients to make wise choices when buying any HVAC

system.

Government is introduce minimum energy standard in all electrical appliances

including air-conditioning. Nothing below B class energy rating, but who looks

at this?

Airconditioning split units:

Airconditioning split units all now come with energy rating, do you look at this and consider the effect on your client? (EER, COP, ESEER) Residential, retail, light commercial, shipping centres, industrial systems can all benefit Fixed speed units versus DC inverter units? Controls much more advanced today (Airwell controller) Min set temperature cooling and max on heating Occupancy sensors Only 9000 or 12 000 btu, really will not make a difference

Variable Refrigerant Flow VRF Systems:

1. Soft start with DC inverter control 2. Saving of 40 – 45 % over fixed speed splits 3. 2 pipe heat pump and 3 pipe heat recovery systems 4. DC inverter technology variable speed compressors 5. Energy efficient, correct heat loads 6. Diversity factor 7. Easy to install and Service 8. Cooling and Heating options (heat recovery) 9. Controls with set temperature 10. Occupancy sensors

Typical VRF System

.

Chilled Water systems / Hot Water:

1. Air-cooled or Water cooled, consider water usage with water cooled 2. 2 pipe, heat recovery partial / Full or 4 pipe cooling / heating chillers 3. Options Scroll, Screw, Turbo-cor, Digital scroll, Inverter scroll / Screw 4. Air-cooled or Water cooled, Air-cooled Modular design 5. Energy efficient, Range from EER 2.5 -5.6 Air-cooled,6.5 Water cooled 6. Type of refrigerant with lower GWP

Chilled Water systems / Hot Water:

Refrigerant options:

Typical Chilled Water hot water 4 pipe system

.

Thermal Ice Storage – Game changer for chilled water

CALMAC

Thermal Storage provides off peak cooling

Reduces the size of your chillers

Using off peak electrical rates

4- 6 year payback on capital cost

Maintenance free

Easy to install and monitor

Can be added to existing plant chiller dependent

Cape Town project reference:Capitec

Novartis Head Office, Johannesburg, Gauteng

Air side options

With ventilation and the Sans regulation, cooling / heating

outside air is a major percentage of HVAC system, consider

pre cooling or heating is air in a different way.

Heating with hot water coils no electric heating

Heating outside air only

Heat Recovery wheels for AHU and rooftops

Energy recovery ventilators, no refrigerant required

Mixing boxes with partial free cooling or economizers

Exhaust air from, heat pumps used for fresh air

Exhaust air ducted to condenser coils, site dependent

Hot Water for potable water and space heating

Water heating for AHU / 4 pipe fan coils versus electric Heating.

Heat pumps generate hot water for space heating and potable

applications

Heat pumps 70 % less than electric elements

Return on investment very quick even for residential hot water

systems

Examples of project:

• La Mercy Beach Hotel – VRF with occupancy sensors

• Breakers Umhlanga – VRF and Heat pumps

• Rand park golf course – Heat pumps

• UKZN PMB lecture – 4 Pipe chillers

• UKZN Durban – Ice storage

• Capitec head office – ice storage

• Airco head office – PV, heat pumps, VRF

• Pfister Medical - Rooftops mixing boxes

• Kwa Dukuza Mall – Inverter rooftops

Conclusion when consider HVAC system:

• Professional assessment of the building or areas needs

• Holistic approach to selecting the system

• Benefits for the client in the short term and long term

• Possible changing the system in a few years

• Life span of the plant and Servicing / Maintenance

• Capital cost and most important return on investment

• Cost of running the system, tenant, developer, user

• Select the right system for the application

• Put yourself in the clients position and give them the options

• Integration of different systems and services

Thank you :

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