Air Conditioning FAQ and refrigeration FAQ from Right Climate
our FAQ;s cover Air Conditioning information, refrigeration information, air conditioning regulations and much more
Air conditioning covers many things but is mainly, heating, cooling, ventilation, fresh air, filtration and control of humidity.
Comfort cooling mainly relates to provision of just cooling to improve comfort.
Close control air conditioning is really as the name implies, both temperature, humidity and air cleanliness are closely controlled and often to fine tolerances if necessary.
It is highly unlikely, you are more likely to catch it from a shower head in a hotel room that has not been used for a long time. But, legionella can be caught from the aerosol spray of infected cooling towers of larger, older and poorly maintained air conditioning systems.
The drive towards lower carbon emissions and a greener workplace has led to an extensive range of new obligations which are often complex to interpret. Clean Air can help! We have a keen understanding of the latest regulations and will guide you through your responsibilities. There really is no substitute for practical experience. Our indepth understanding of HVAC products and technologies combine with an appreciation of ‘real life’ capabilities. We know what products suit which applications best. This means that you can have confidence that our solutions will be appropriate, carefully considered and cost effective. We expect to save you money and repay capital expenditure quickly by lowering running costs and, where possible, applying for Carbon Trust incentives.
Quite possibly, contact our service or sales teams they may be able to send you copies or at least advise you how to proceed.
We will review HVAC equipment, considering efficiency at full load and carbon dioxide emissions and relating it to Target Emission Rates and Building Emission Rates. Expert advise is a necessity and our Clean Air HVAC designers will be pleased to assist you.
No more than you do or any ventilation system does for airborne viruses and bacteria. Many people are susceptible to dryness sometimes caused when an air conditioning system is badly designed or maintained and the relative humidity is reduced too much. It’s a fact that basically coughs and sneezes spread diseases, but some people will blame anything for their ills rather than understand the facts.
Air conditioning systems work by moving heat from inside your premises to the outside. In a central air conditioning system air is drawn into the ductwork system through the return air system. Installed in the return air ductwork is an evaporator coil. This coil is connected to the condensor, the unit that is outside your home, by copper tubing.
The refrigerant is then pumped from the condenser to the evaporator coil. As the refrigerant passes through the inside of the evaporator coil, warm air from inside your home passes over the outside of the coil. Because the refrigerant is cooler than the warm air, the refrigerant absorbs heat from the air. The refrigerant is then sent outside to the condenser unit. When the warmed refrigerant is in the condenser unit it is compressed by the compressor; the compression of the refrigerant causes it to boil. As the refrigerant boils it gives off the heat it picked up from inside your home. The refrigerant is then passed through the coil in the condenser unit where it gets cooled again and is ready to go back inside to pick up more heat from your home.
As this whole process is going on, the temperature and relative humidity in your premises are both lowered. The relative humidity level drops because cooler air cannot hold as much moisture. As the air cools, it gives up some moisture and it gets collected in the base of the evaporator coil and is then drained away.
The EPBD requires that all air conditioning systems with a rated output of 12kw or over are inspected by the 4 January 2011. This is a total figure combined from all air conditioning units controlled by your business. After this an inspection is necessary every 5 years. New systems installed on or after 1 January 2008 require their first inspection within 5 years of the install date.
Energy labelling is a new way of allowing consumers to easily compare and rate the efficiency of air conditioners and systems, similar to that used for domestic appliances such as fridge’s and washing machines etc.
Energy efficiency ratio is used to express the relative efficiency of a heating or cooling device by dividing the heat output by the power input. The higher the ratio compared to others, the better the system is.
Coefficient of Performance, which is the ratio between the power input and power output. For example a modern heat pump will provide 3kw of heat for 1kw of electrical power input. Therefore the COP is expressed as 3 – 1.
An electrical inverter is used to vary the frequency of the power supply from a normal UK 50Hz enabling fine step speed control of motors (compressors) this in turn varies the quantity of refrigerant delivered and hence variable cooling or heating capacity.
VRV is a system developed and designed by Daikin Industries and means “variable refrigerant volume”. Daikin protected the term VRV so other manufacturers use the term VRF “variable refrigerant flow”. In principle they both work the same and are extremely efficient, reliable, energy saving ways to heat and cool all types of buildings with minimum installation time or disruption.
The volume or flow rate of refrigerant is accurately matched to the required heating or cooling loads thereby saving energy and providing more accurate control.
In short, they are probably the best systems currently available for mid to large applications.
A heat pump is a machine that by reversing it’s refrigeration cycle can provide heating in stead of cooling. Because a heat pump uses a refrigerant it can upgrade the heat in air at even -15ºC to a usable heat source to heat buildings. Difficult to understand perhaps but imagine a domestic fridge or freezer, reverse its cycle and that black grille on the back will be very cold whilst inside will be very hot.
Heat pumps can extract heat from air and water and are nearly always used to both heat and cool a building very efficiently and economically.
There are some simple things you can do to save energy when using an air conditioner:
- Install the air conditioner (or outdoor unit of a split system) on the shady side of the building (or shade the air conditioner itself); make sure the air flow around it isn’t obstructed.
- The temperature of a heated room in winter should be between 18-21°C while the temperature of a cooled room in summer should be about 23-26°C (remember the humidity indoors will be low, so it will feel cooler). The temperature should be checked after the air conditioner has been operating for 30 minutes.
- When a hot day is expected, turn on the air conditioner early rather than wait till the building becomes hot (it operates more efficiently when the outside air temperature is cooler).
- Keep windows and doors closed when using a refrigerative air conditioners (evaporative air conditioners require some air flow). Close curtains on hot summer and days and cold winter nights. Outdoor shading of windows in summer is most effective.
- If the machine has adjustable louvres, adjust them towards the ceiling when cooling, and towards the floor when heating (as cool air falls, hot air rises).
- Follow the manufacturer’s instructions for filter cleaning.
The benefits of Air Conditioning are to give a comfortable environment at work or at home throughout the seasons, Spring, Summer, Autumn and Winter.
An Air Conditioning unit can have two functions – heating and cooling.With an auto changeover switch on most new units, you set the temperature and the unit will cool or heat as required automatically.
Air conditioning Yearly preventative maintenance is a wise thing to do. Properly maintaining your system will save you money on your energy bills and will help your system perform at peak efficiency. A properly maintained system also lasts longer which is important due to the expense of replacement. During a preventive maintenance, certain parts that can cause trouble when dirty, are cleaned to keep the system running smoothly and efficiently.
A maintenance service also includes inspection of your system so problems can be discovered before serious damage occurs and you find yourself without air conditioning in the middle of summer or winter when you need it the most.
Ducting, outlets and fittings come with a 10 year manufacturers parts warranty.
Check your supplier is authorised to install your air conditioning system. Having read some Fujitsu warranties they can be very specific about installations.