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A combined heat and power generation system

An Engineered Product of Enman

Figure 1: Schematic of the solar cogeneration system

What is solar cogeneration?

This is the combined generation of power and heat from incoming solar radiation. Solar Cogeneration makes most of your Solar Investment, providing excellent combined efficiency of 70-80% compared to harnessing 20- 22% of available solar energy in a solar PV system.

It converts 20-21% electrical energy and 50-60% thermal energy.

The cogeneration system consists of

  • A conventional solar PV module to generate power. Enman uses world leading LONGi solar PV modules, a certified product of Clean Energy Council (CEC) of Australia
  • A heat recovery system attached to the solar PV module to recover heat
  • The solar PV module and heat recovery system collectively called PVT
  • The heat recovery system is made by SolarMaster as shown in Fig 2
  • The Solar PV module and the heat recovery system come together and therefore an existing solar PV system cannot be upgraded to Solar Cogeneration system.
  • The PVT solar panel thermal performance is shown in Fig 3

Figure 2: Schematic of PVT construction

Figure 3: Typical solar cogeneration performance curve

How does it work?

Solar PV cells are normally dark coloured material and get heated when solar radiation falls onto the surface. Only a small part of the incident solar radiation is converted into electricity.  However, most of the incident solar energy is converted into heat, increasing the temperature of solar PV panels, and reducing the power generation.

The solar cogeneration system captures the waste heat generating hot water. Here fluid such as water/water-ethylene glycol mixture is passed through a heat exchanger attached under the solar PV panels collecting most of the waste heat. This also improves solar PV efficiency. The fluid carrying the excess heat can be used for suitable thermal applications. Therefore, in a cogeneration plant, the benefit is twofold, it improves the performance of solar PV panels and provides free thermal energy.

Figure 4 Typical summer performance of Solar Cogeneration in Melbourne

Figure 5: Typical summer performance of Solar Cogeneration in Sydney

Figure 6 : Typical summer performance of Solar Cogeneration in Brisbane

What makes our engineered product superior to others?

High temp application

Majority of the products available in the market focused on low temperature (<30 °C) application limiting scope of their applications. Enman’s engineered solar cogeneration product can produce hot water at higher temperature (40 to 60 °C) enabling it to be used for process heat for industry, domestic hot water systems for hotel, restaurant, office, hospital and much more.

Advanced control system

Enman’s engineered solar cogeneration system is integrated with its proprietary energy optimization application. This can be in one hand ensures optimum operation, on the other hand provides seamless operations such as internet-based performance monitoring and energy management function.

Knowledge of local climate conditions

Performance of solar cogeneration depends largely on the local climate conditions. Enman has developed inhouse modelling and simulation capability enabling the accurate analysis and performance predictions.

High efficiency

Enman’s engineered solar cogeneration system can achieve higher efficiency even for high temperature (40 to 60°C) application.

In house testing capability

In house modelling and testing capability makes Enman’s engineered product very reliable  and dependable.

Energy Storage

The cogeneration system can be designed with a thermal storage tank for hot water use and a battery system for electricity use.

Comprehensive Solar System Study

Enman provides a comprehensive Solar cogeneration system study through process modelling. This is to optimise Solar generation capacity and heat generation capacity together with thermal and electricity battery storage.

It is always recommended to conduct a technical study before implementing such a project. This will ensure the system is sized correctly providing maximum economic return on investment.

Who is the beneficiary of Solar cogeneration system?

As the system produces heat from 40 oC to 60 oC, therefore ideally suitable to commercial, industrial and domestic applications to preheat water. It is always recommended to have a booster heating system to provide booster heating when there is no solar energy available. Normally the existing hot water system can be used as the booster heater.

Solar PV

ENMAN provides the service for the assessment of solar power generation. This assessment is to optimise solar generation capacity and battery storage requirements.