Any hot water application up to 70 deg C
As an added benefit, heat pumps can double down on your energy efficiency if there is a concurrent need for process cooling. This kind of application is prevalent in the food processing industries such as breweries, dairy etc.
A heat pump is a system, which moves heat from a cold zone to a hot zone. An example would be the refrigerator commonly used in our homes. Traditionally heat pumps are used to maintain “coolness” in conditioned spaces. However, in industrial applications we are interested in using the heat generated in the hot zone. Here is a comparison between the two systems:
|Process||Refrigeration Cycle||Refrigeration Cycle|
|Application||Used for Process Cooling||Used for Process Heating|
|Condensing temperature||30 to 35 deg C||80 to 90 deg C|
|Evaporating temperature||7 to 12 deg C||15 to 20 deg C|
Heat pumps operate on the principle of vapour compression refrigeration system. In takes in energy from any ambient resource such as air, water or underground, and increases the quality of heat by adding extra energy. This extra energy is by using electricity.
What is the temperature attainable? Most heat pumps available in the market commercially provide you with hot water temperatures up to 75 C. Aspiration Energy’s high temperature systems can provide temperatures even up to 90 C. This is attainable through improvements in compressor operation and choice of refrigerants. .
An average of 40,000 per month
This matrix should give you an idea of the yearly savings (rupees) possible at different loads (kW) and percentage utilization (hours)
|Average Load (KW)||18||19||20||21||22||23||24||25|
|% Utilization (hours)|
The energy saved is calculated based on the average load at percentage utilization of 24 hours.
Energy saved = Load of the heat pump x No. of hours x Cost of Electricity x Savings from Heat Pump x No. of working days in a month
At 18 kW load and on running 50 percent of the day, Savings of a heat pump = 18 * (24*0.5) * 7 * 50 % * 30 = 22680 rupees/ month
Note: Heat pump is conservatively assumed to save 50 % of existing energy cost
The heat pump is assumed to run 30 days in a month
Electricity cost is assumed at 7 rupees/kW
Using two temperature sensors and a flow meter . The heat pump outlet and the inlet temperatures are measured and the flow rate.
By simple calculation, Heat delivered = (T2 – T1) * Mass Flow Rate * Specific Heat of Water