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.
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)|
How is the above table calculated?
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
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
Can I use it for a single shift operation in my plant?
Yes, it would be technically feasible without a doubt, but the savings, in economical terms would not be substantial – around Rs 30,000 per month for even for full load conditions
Do you get cold air from the heat pump?
Yes, cold air can be a free output from heat pumps in the evaporator side. However they cannot be used for Air conditioning processes as the temperature delivered will be in the range of 15 to 20°C
Is a CAPEX Model available for buying the same heat pump?
Yes, Heat Pumps that are available in Capital Investment Models with accelerated depreciation benefits