Significant capital cost savings
The direct integration of the chiller eliminates a separate cooling coil and the cooling tower.
The multi-functional high performance energy recovery system with integrated chiller is an efficient and cost effective solution for cooling and dehumidification of outside air. This innovative design significantly reduces capital cost and guarantees minimum energy consumption.
In summer, when outside air (OA) is very warm, cool, dry exhaust air (EXH) is used to cool the fluid circuit. The cool fluid is further cooled directly in the chiller, without a separate chiller circuit, and then cools the outside air. Cooling of the outside air occurs with the energy recovery coils rather than with a downstream cooling coil which requires more chiller capacity. (Video 1).
If the OA also requires dehumidification, there are energetically attractive options. In a pre-cool reheat design, the supply air handler has two energy recovery coil banks, a pre-cooling bank and a re-heat bank. Cool, dry exhaust air (EXH) is used to cool the fluid circuit. The fluid is first pumped into the re-heat coil where it reheats the supply air (SA) after dehumidification. This eliminates the need for a separate re-heat coil and cools the fluid further before it is entering the chiller. The chiller cools down the fluid to the temperature required which ensures dehumidification. Due to this pre-cooling of the fluid the chiller can be down-sized which saves capital cost. A very effective way to cool and dehumidify hot and humid outside air.
The condenser heat of the chiller is dissipated in an additional coil bank in the exhaust air stream. (Video 2).
In winter, the two energy recovery coil banks in the exhaust air handler are connected in series and work together to provide maximum heat recovery. By connecting the two coil banks in series the heat recovery potential is greatly increased. (Video 3).
This is also a great advantage when it comes down to cleaning, as for example the german norm VDI 6022 is demanding thorough cleaning.
With this design, compared to conventional applications, capital cost is greatly reduced. No cooling coil is required, piping to the cooling coil is eliminated, and the chiller capacity requirement is lowered. Also, expensive cooling towers become obsolete.
Significant energy savings
By pre-cooling the fluid circuit with cool exhaust air and then re-heating the supply air after dehumidification, chiller capacity requirements can be reduced. The chiller is sized to provide incremental cooling capacity rather than full load capacity. Additional savings are realized by eliminating a separate chilled water circuit as there are no heat/cold transfer losses in the system.