ENERGY SAVING EQUIPMENT
Ventilation for better indoor air quality
Robert Kuiperij, customer service product specialist and trainer at Samsung Electronics Air Conditioner Europe talks about Samsung's air handling unit kit.
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n light of the recent global pandemic, indoor air quality (IAQ) has come under renewed focus – denizens of the world were compelled to spend more time indoors
and reconsider questions about the quality of the air we breathe in. Ventilation is one of the cheapest ways to get good IAQ and Samsung is constantly innovating and educating its partners to help improve indoor climate comfort and wellbeing. Research shows that millions of European citizens
spend more than 90% of their time indoors, with two thirds of this time spent in their homes and the remaining at workplaces, schools, or public spaces . These spaces are looking at ways to regulate indoor climate comfort for the end-user and ensure proper ventilation, particularly with the use of efficient Air Handling Units.
The traditional AHU The traditional Air Handling Unit (AHU) is a centralized type air-conditioning system that can provide cooling, heating, ventilation (fresh air) and humidity – all in a single package. Almost all Air Handling Units control logics are based on supply air or discharge temperature control. Depending on the purpose of the unit, or the season of the year, a certain supply air temperature is required. When the AHU is used as the main solution to heat and cool a room or a building, then a steady supply of air at a temperature of 16°C (or lower) is needed in the summer period and 35°C (or higher) during winter. For most DX AHU kit suppliers this is not a problem. Additionally, when the AHU is used as a ventilation
30 January 2022 •
www.acr-news.com
unit and an efficient solution is the aim, it is best to have a supply air temperature between 21°C and 23°C in both summer and winter. Together with the DVM indoor units, it is possible to create comfortable conditions in the building while contributing to a healthy indoor air quality. The prerequisites to ensuring this state of steady and comfortable temperature include a perfectly designed system alongside a heating and cooling system that reacts rapidly and correctly to changes in control inputs.
Capacity controlled DX air handling unit kit When asked about their ideas on Direct Expansion (DX) cooling and heating on an AHU, most installers would respond that this solution is energy-efficient and fast. However, they also flag how the stability and control possibility is poor. To explain the above in more detail, we have to go back to the original process of heating and cooling when most AHUs were based on water type cooling and heating coils. For the cooling process, we used cold water from a water chiller, and for the heating process, warm water from a boiler. The capacity was easy to control by changing the water flow or temperature of the water. Fast forward to today – and it is possible to use refrigerant in place of water.
Samsung’s DVM AHU kit At Samsung, we developed a product called a DVM AHU Kit that allows water to be replaced with refrigerant inside the cooling and heating coils. The major advantage here is that it facilitates only one exchange of energy
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