Stuck in a stack-Temperature measurements of the microclimate around split type condensing units in a high rise building in Singapore

- First field experiments on stack effect induced by split type air-conditioners.
- Temperature rise of 10-13 °C over 20 storeys due to stack effect.
- Temperature rise of 9 °C due to “stuck effect”, caused by recirculating hot air.
- Measured on-coil temperatures of 50 °C for upper storeys.
- Significant performance reduction, COP reduced by 18% (stack only) 32% (combined).