Optimising Building Performance
An existing energy guzzler and reciprocating chillers were replaced with two units of highly efficient YORK water cooled screw chillers...
India’s Pushpawati Singhania Research Institute was in need of a retrofit solution as its current centralised air conditioning system was inefficient and incurring unnecessary costs. Johnson Controls led the project which cut electrical costs by more than 50% (equivalent to USD 70,000) and freed up space for future expansion.
Pushpawati Singhania Research Institute (PSRI) is South East Asia’s first and India’s foremost institute providing advanced and comprehensive medical and surgical treatment for digestion-related diseases, with core specialisation in the treatment of aliments related to liver, kidney, gall bladder, pancreas and gastro-intestinal tract systems.
Located in South Delhi, PSRI has become a leading knowledge centre with state-of-the-art medical facilities.
As the hospital sees many patients each day, it is paramount for it to maintain optimal humidity and temperature levels to create a comfortable indoor environment.
However, its old air conditioning system was unable to meet rising load conditions and was consuming 60 to 70% of the hospital’s electricity.
Johnson Controls Maps Retrofit Plans
PSRI’s initial system ran on six water-cooled reciprocating chillers with the capacity of 50 tons of refrigeration (TR) each, which provided an efficiency rate of 1.1kW/TR that was below expectations.
Johnson Controls swiftly performed an audit and presented a complete centralised air conditioning retrofit solution that would raise the efficiency of the system.
The team first consolidated real annual data to gauge for accurate energy consumption demands. They then compared the efficacy of the initial and proposed new systems based on current demands.
The total energy consumption of the old system was 1,049,272 units of electricity, while the estimated consumption of the proposed system was only 504,572 units of electricity – a reduction of more than 50%.
Reaping the Benefits
PSRI recorded electrical savings of more than five lakh units within a year, equivalent to USD 70,000 (based on the tariff rate of USD 0.134). With such robust savings, the projected payback period was only 25 months. They could also enjoy a comfortable environment within the hospital for the benefit of both patients and doctors. During the retrofit project, the Johnson Controls team was sensitive to the needs of the customer and managed the installation works without disrupting the operations of the hospital.
“The installation work was successfully completed within 45 days - 15 days ahead of schedule,” commented Debashis Kole, Chief Engineer, Pushpawati Singhania Research Institute. “Johnson Controls accommodated their working time to minimise disruptions to our hospital’s operations. Where shutdown periods were required, the team scheduled for the tasks to be completed at night. We really appreciate the thoughtfulness shown.”
Moreover, the hospital also recovered an estimated 450 square feet area previously occupied by the six old chillers. This freed-up area can be used to house new chillers powering up the new extension in the hospital, providing a single plant room serving two different buildings for ease of operations and maintenance. It can also potentially increase the parking space available within the hospital.
“It was a great experience working with Johnson Controls. We are satisfied with their commitment, workmanship and technical knowledge. I will definitely recommend Johnson Controls for professional services, and I look forward to continue working with them in future,” Kole concluded.
• High energy consumption due to low efficiency of centralised AC System
• Maintain optimal level of comfort in hospital premises
• Optimise layout space within plant room for future expansion
• Energy audit to identify appropriate system capacity
• Complete retrofit solution for centralized air conditioning system, including:
– Two highly efficient YORK water cooled screw chillers (model YRTDTCT0555C)
– Three cooling towers
– Primary and secondary chiller pumps
– Condenser water pump
• Reduction of energy consumption levels by more than 50%, resulting in energy savings of USD 70,000 per year
• Comfortable indoor environment for the hospital’s patients
• Freed up 450 sq ft of space for future expansion.
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