Updated Temperature regulation is a central feature of HVAC systems, if the room temperature cannot be regulated properly, that implies the system is dysfunctional. Note: Temperature regulation is achieved by the use of sensors at the respective room in use. The reading from the sensor is compared against the set temperature and heating and/or cooling power is increased or decreased accordingly.​room temperature sensorsSo the focus would be on humidity. Humidity control does not necessarily need to be part of the main HVAC system. The cheap and easy way would be to get a small room based Dehumidifier to decrease or Humidifier to increase the relative humidity respectively.There are 4 different type of scenarios, heating with drying, heating with wetting, cooling with drying and cooling with wetting.The following graph of humidity versus temperature would be quite useful to understanding some of the problems.​Floods and Droughts in a Changing Climate​Source: CBE Thermal Comfort Tool for ASHRAE 55 (CBE Thermal Comfort Tool for ASHRAE-55)Author: Center for the Built Environment, University of California BerkeleyAlong with this graph of Thermal comfort, which shows that the ideal comfortable temperature for most people ranges between 18°C (65°F) to 30°C (86°F).

At this temperature range, a 5°C increase will decrease the relative humidity to at least 70% from dew point (100%).1. Heating with dryingHumidity is usually sufficiently reduced by the increased temperature. Additional drying can be by pre-cooling the air upstream to remove the water vapour via condensation. Energy savings can be achieved via a condenser coil with its radiator placed downstream since the heat generated by the cooling can be used to pre-heat the air before the main radiator.2. Heating with wettingThis is achieved by placing a section for spraying mist downstream of the radiator. The mist may significantly reduce the temperature so fine-tuning and a higher capacity radiator would need to be installed. The desired humidity can be achieved by increasing or decreasing the number of nozzles spraying mist.​Chinese Bus Stops Spray Cooling Mist On Overheated CommutersThe picture while slightly misleading is a better illustration of how it works, the actual mist spraying section of the HVAC works in a similar fashion.3.

Cooling with dryingA lot of cooled air environments can hit the dew point. A workaround is to cool the air below the set temperature, followed by heating the air downstream back up to the set temperature. With a similar energy saving trick used in section 1, some of the heat generated by the additional cooling can be used to re-heat the air. An Energy recovery ventilation system may be used for energy saving in this scenario.4. Cooling with wettingThis scenario is typically applicable to desert regions. The solution described in section 2 is reused. A section for spraying mist is placed downstream of the condenser coil to both further cool the air and to increase the relative humidity. Since the mist may significantly reduce the temperature, fine-tuning and a lower capacity condenser can be installed instead. The desired humidity can be achieved by increasing or decreasing the number of nozzles spraying mist.Thanks for the A2A.Written All air conditioners follow four basic process Cooling Heating Cooling and dehumificationHeating and humidification.   

Outlet air from air conditioners into the room dependent on the room conditions that's to be maintained which can be obtained from psychometric chart and is called as apparatus dew point temperature. Another parameter that has to be maintained is air flow rate which is a factor of sensible load within the room. cost to replace air handling unitOn altering the factors like apparatus dew point temperature and air flow rate required conditions can be maintained within the room.decorative wall ac coversWritten If you have an older HVAC unit, lubricate the motor regularly and replace the belt if there are signs of crack. best air conditioning units 2013Replace and clean the air filters regularly and check the functioning of the ventilation system.

When the HVAC unit is Running Check the amount of refrigerant in cooling systems & Measure the high and low side temperature of the system. Also regular maintenance of HVAC system is important to perform at its optimal strength.About Air Handling Units Data centre air handling units (AHUs) come in a number of different configurations. The most common types are as follows: Down-flow – this is the most common type of air handler experienced in enterprise data centres. The term down flow refers to the way the air moves through the unit. In this configurations exhaust air from the servers enters the top of the AHU, is pulled across a cooling coil and blown, by internal fans, into the data centre’s under-floor plenum. These units generally have EU4 filtration or similar internally and can be combined with direct fresh air systems. Down flow units are deployed using either chilled water or direct expansion cooling systems, or a combination of the two together in some free-cooling applications.

Up-flow – generally only encountered in legacy data centres up flow air handling units work the opposite way to down flow units. Due to advances in aisle containment technology and data centre design up flow units are very rarely deployed in new data centres. Both Down-flow and Up-flow AHU’s are often still referred to as CRAC Units or simply CRAC’s, from their historic name i.e. Computer Room Air Conditioning Units In-Row – originally brought to market by APC most AHU manufacturers now have an in-row product offering. Whereas up and down flow systems move the air vertically in-row units move air horizontally, pulling it directly from the hot aisle, cooling it, then delivering it directly to the cold aisle. Within certain sets of physical constraints in-row units do have advantages over vertical air flow systems. In-rows are very efficient in their use of fan energy as there is no external resistance to the air flow and they offer high cooling duties relative to their footprint.

Rear door heat exchangers – both active and passive rear door systems, like in-row systems, move the air horizontally. Rear door systems place the cooling coils at the rear of the server cabinet and can support very high densities. They are extremely space efficient and offer even greater cooling duty per m2 of floor space than In-row cooling. With good design and the right configuration of heat rejection plant they can provide exceptional energy efficiency. These are some of the more common air handling systems used in today’s data centres. There are others and it is important to note is that each configuration will have different pro’s and con’s depending upon the particular requirements and constraints of each application. When it comes to data centre air flow there is no “one size fits all” solution. Depending on the physical constraints associated with your specific building or location any of the above could be best. By working with Future-Tech we can help establish your project’s unique drivers, requirements and constraints and with this information we will select the air handling solution that best achieves your projects goals.