||Nowadays, the hospital industry is continuously growing, more efficient energy management is necessary. Due to the HVAC (Heating, Ventilating, and Air-Conditioning) system accounts for over 50% of total energy consumption in a typical hospital, it is one of the most effective measures in saving operation cost of the heating and cooling systems in a typical hospital building.|
In this study, a complete evaluation procedure of energy-saving and efficiency improvement for a large-scale hospital retrofit project has been established and successfully validated in Taiwan. The retrofit scheme, in integrating the alternative hot water system, namely, a WSHP or Water-source Heat Pump, with the existing HVAC system, enables the system capability to meet the cooling load and hot water demand simultaneously with a larger safety margin and saving energy as well. The procedure consists of performing the jobsite system diagnostics, developing a corresponding retrofit strategy, performing computer simulation to evaluate its effectiveness, and followed by full-scale experiment to validate the results.
In addition, it has been found that the integrated system provides a new source for cooling which can be utilized as a system redundancy in avoiding system shutdown. This is very useful when considering in specific areas in the hospital, such as intensive care units, or operation rooms, where cooling should not be interrupted in any occasion.
During the system design and selection process, an exergy analysis has identified that the WSHP outperformed the ASHP (Air-source Heat Pump) significantly. It has further been validated by the full-scale experimentation that the COP of the newly added WSHP system, under heating and cooling mode, is 3.62 and 2.62, respectively, which correlated very well with the computer simulation results with deviation kept within 2.2% to 2.6% under each mode.
The recorded annual cost reduction by this integrated system is $102,564, with a payback of 1.2 years. The hospital after retrofit has been operating safer, with more redundancy, and more energy-efficient which warrants tremendous potential for implementation in the industry.