Grundfos - Waste Heat Recovery Project

Customer requirements:

There is one 75KW air compressor unit in the customer's air compressor room, and the heat loss of the air compressor unit is relatively large, which needs to be discharged in a timely manner. Due to the fact that the air compressor room is located inside a closed workshop, the exhaust of the air compressor system can cause an increase in room temperature. Therefore, the customer wishes to install an air heat exchange system in the air compressor room to recover the heat emitted by the air compressor system and use it as a heat source for showering.

Solution:

Using heat recovery equipment to collect the waste heat of the air compressor, and then exchanging heat with the water in the buffer tank through a plate heat exchanger. The heated water is collected in the insulated water tank and supplied to the shower room for use.

Scheme effect:
The heat recovery equipment can recover a heat power of 49KW. Based on 16 hours per day, the total amount of heat that can be recovered per day is Q=49000J/s * 16h * 3600s=2.8224 * 10 ^ 9 (J)
The utilization efficiency of recyclable heat is set at 80%, and the available heat is 2.2579 * 10 ^ 9 (J)
How much heat is needed for one ton of water to rise by 1 ° C? 4200 (KJ)=4.2 * 10 ^ 6 (J). The inlet water temperature is calculated at 20 ℃, and the target water temperature is 45 ℃. Therefore, 21.5 tons of water can be heated per day

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