The new-look Christchurch airport required a solution that maintained a comfortable indoor temperature in a large space. This included addressing the challenge of having two entrance doors without a two door lobby arrangement to contain the indoor ambient temperture. One door faces south and the other faces east so the prevailing cool winds had a very noticeable effect on the temperature in the arrivals hall, let alone the ongoing energy costs in trying to maintain heat in this space. There were also limitations on capacity of hot water from the central plant and power supply to this end of the terminal.
To create an invisible barrier across the arrivals hall door and retain indoor conditions, air curtains were selected as the most cost effective option. These air curtains need to be heated to be effective on cooler days and this is where a hot water heat pump system located at the end of the arrivals hall was the total solution to all these issues confronting the airport engineers.
Two Daikin 16Kw Altherma hot water heat pump units, coupled to an 800 litre buffer tank, were installed with two circulating pumps, one for each door circulating 50 – 55 degrees Celcius hot water to the water heating coils in each of the air curtains, with the airport BMS system controlling the doors and hot water pumps when heating is required.
Overall our solution has answered the challenge at hand as well as providing reduced energy costs.