Saint Marks Hotel

You probably know, the efficiency of your hot water system can have a major impact on monthly energy bill (electric/diesel/gas) if you took forward significantly reduce your energy costs, investing in an energy efficient hot water system is logical and is relatively an easy solution
should you require your business to make better use of energy, reducing operation cost, carbon footprint and maintenance cost, our energy audit is an invaluable tool. A hot water energy audit evaluates how your current hot water system is performing and how much energy is being used and identifies the energy and cost-saving opportunities.
To produce and distribute hot water in the most effective & efficient manner and have huge cost savings, you need both expertise and unbiased System knowledge and clear technical understanding of which system type best the requirement, Energen offers various solutions and options that ensure quick return on investments and huge savings in operation cost
Kindly meet our hot water specialist to know and learn more on how to save huge costs. Meanwhile should you require any clarification please do get in touch.
Note - Site visits for clear understanding & meeting in person to discuss the system proposal
Audit Phases

  • Investigation :

    Obtain all relevant hot water energy consumption data.
    Type of system, floor area,running cost data.

  • Site Survey :

    Obtain detailed information pertaining to the overall site.
    • Discussion with key staff
    • Understand major energy end-uses
    • Identify potential energy saving opportunities

  • Technical Analysis :

    Determines overall energy efficiency
    • Energy end use breakdown
    • Establish energy baselines
    • Analyse energy saving measures

  • Reporting :

    Compile and show energy use in an easy-to-understand format
    • Details of current energy use
    • Performance against benchmarks
    • Energy end use breakdown
    • Savings opportunities including detailed costs and benefits
Solution

St. Marks Hotel Bangalore (Retrofit Implemented in 2012)

Project St, Marks Hotel, Bangalore
No of rooms 100
Hot water supply Guest rooms, Kitchen, BOH area
Present hot water consumption 20,000L / day
Mode of hot water generation 2 x Diesel fired hot water generator (1w+1s)
Tanks 2 X 4KL SS tanks one tank newly replaced
Location of the tank & Hot water Generator Plant room in basement
Capacity of the Boiler 1,50,000 Kcal
This tallies with the hot water requirement, The deference could be due to following reasons.
  • Pipe line losses in supply & return could be higher than 5% calculated
  • Hot water generator efficiency could be lower than the assumed 80%
  • Variations in hot water consumption
Present diesel consumption 75L/day
1 L of HSD generator 10,000 Kcal or 11.63kW of energy
Burner boiler combined efficiency 80% (Therefore output from boiler per hour = 9.3kW)
Output for 75L of HSD generator 698kW

Present operation cost

75L HSD/day x Rs 60 = 4500/day

Yearly operating cost

= Rs 16, 42,500

Client Requirement

  • Change the existing system to energy efficient hot water system with low Operating / Running & maintenance cost
  • Free up Space in plant room and make it more open and easy for service and accessibility.
Energen Proposal
  • Heat pump hot water system not Solar Hybrid as no roof space availalbe for solar collectors
  • Existing tanks with few modifications to ports as they are in good condition
  • System type can be direct as the water quality is good and maintained ≤90ppm hardness.
  • Circulation pumps to be added to the heat pumps and plumbing to be done as per the site requirement and equipment placement
  • Location : Tanks to be in the basement in the plant room, Heat Pumps to be located above the plant room behind hotel building on a steel frame and plumbed to tanks.

Energy calculation

Cold water input temp 250C
Hot Water Output temp 550C
Differential temp 300C
Hot water requirement 18-20KL / day
kW 698kW
Add 5% for line loss 734kW

Equipment Selection

Heat Pumps:
Total power required 734kW
Heat Pump operating time 8-10hr
734/9hr 81kW
kW 698kW
Heat pump -2x40kW heat pump
Note:Hot water demand is 20KL at peak load under 100% occupancy so no standby considered.

Cost of Equipment

2 x 38kW Heat pump Rs 11,90,000
2 x heat pump circulation pumps Rs 70,000
plumbing, installation & commissioning Rs 96,500
Cost of transportation, loading & Unloading Rs 34,500 + Rs 85,457
Cost of frame Rs. 34,500
Total Cost Rs 15,30,957

Return on Investment

Present operating cost Rs 16,42,500
COP of heat pump 4
Input to the heat pump 100/4 = 25%
Input in kW 25% of 738kW 184kW
Operating cost of heat pump 184kW x 365 days x Rs 10 Rs 6,71,600
Saving in operating cost Rs 16,42,500 – Rs 6,71,600 = Rs. 9,70,900
ROI Rs.15,30,957 / Rs.9,70,900