Solar Thermal Training Systems & Lab Equipment

In this section we will cover solar thermal training systems, the technology and how these systems differs from the more common solar photovoltaics training systems.

We will also look at reasons for teaching solar thermal technology and the best practices, including how to search and find the best solar thermal training systems.

 

What is a solar thermal training system?

A solar thermal training system is purpose-built instructional equipment used to teach how solar energy is converted into heat — as opposed to electricity (which is photovoltaics). These systems replicate industrial and residential solar thermal installations in a compact, instrumented format designed for classroom and laboratory use.

Typical systems include a solar collector (flat plate or evacuated tube), a heat transfer circuit with pump and piping, a storage tank, temperature and flow sensors, and a control unit. More advanced systems add secondary circuits for domestic hot water simulation, space heating integration, or absorption cooling.

The hardware is accompanied by measurement software — students monitor collector efficiency, heat gain, thermal losses, and storage temperature in real time — alongside structured curriculum materials: lesson plans, student exercises, and assessment guides.

Solar thermal training systems are used in HVAC and plumbing training programmes, renewable energy courses, building services engineering faculties, and vocational centres training installers for residential and commercial solar thermal systems.

 

Solar Thermal vs. Solar Photovoltaic (PV)

There are differences between Solar Thermal and Solar Photovoltaic technology, below a table to summarize the main points in residential applications. See this other product category for solar pv training equipment.

 

	Solar Thermal	Solar Photovoltaic (PV)
Technology	Absorbs sunlight to heat a fluid (water, oil, air or other)	Absorbs sunlight and creates electricity by silicon-based technology
Residential application	Warm water usage, or spatial heating through radiators	Residential electricity for any household purposes
Benefits	Space efficient, energy efficient, simple technology	Long lifespan, can cover significant amount of household electricity needs
Downsides	Less effective in winter times, can freeze if temperature drops	Intermittent (needs battery storage), initial investment, needs large space

 

Why Solar Thermal Training Matters Now

Solar thermal technology occupies a specific and growing niche in the energy transition — one that is often overshadowed by the more visible solar PV market, but remains critically important for building decarbonisation.

The core application: heating water. Globally, water and space heating account for roughly 50% of building energy consumption. Solar thermal systems — particularly when combined with heat pumps — provide one of the most efficient pathways to reduce this demand using renewable sources.

In Europe, solar thermal is embedded in building energy performance regulations. The EU's Energy Performance of Buildings Directive (EPBD) increasingly requires new buildings to incorporate renewable heating, and solar thermal qualifies. In the UK, the push toward low-carbon heating under Part L of the Building Regulations is expanding demand for installers who understand both solar thermal and heat pump integration.

Specific applications driving training demand:

Domestic hot water systems. The simplest and most common solar thermal application. Every HVAC and plumbing training programme serving the residential construction sector should include this.

Combisystems. Solar thermal combined with space heating — relevant for countries with high heating loads (Northern Europe, Canada, northern US). More complex to install and commission, requiring more advanced training.

Process heat. Industrial applications using solar thermal for pre-heating, drying, or low-temperature process heat in food, beverage, textile, and chemical manufacturing. A growing market with few trained technicians.

Solar cooling. Absorption chilling powered by solar thermal collectors. Still a niche technology but relevant in hot climates and for students studying advanced HVAC systems.

The workforce that installs, commissions, and maintains these systems overlaps significantly with HVAC technicians, plumbers, and heating engineers. For training institutions, solar thermal equipment is often a natural extension of an existing HVAC lab rather than a standalone investment.

 

Key Components and How They Differ from PV Systems

Solar thermal training systems share some surface similarities with solar PV systems, but the underlying technology is fundamentally different. Understanding these differences matters when specifying equipment.

Collectors. Solar thermal collectors absorb sunlight to heat a fluid, not to generate electricity. The two main types are flat plate collectors (a dark absorber plate under glass, with copper or aluminium pipes carrying heat transfer fluid) and evacuated tube collectors (individual glass tubes with vacuum insulation, higher efficiency in cold climates). Training systems should ideally include both types for comparison.

Heat transfer circuit. Unlike PV systems (which are entirely electrical), solar thermal systems are plumbing-intensive. Pumps, expansion vessels, mixing valves, heat exchangers, and piping are all components students must learn to install and maintain. The heat transfer fluid is often a glycol/water mix to prevent freezing — handling this fluid is a practical skill in itself.

Storage. Solar thermal systems store heat in insulated tanks, not in batteries. Tank sizing, stratification, and heat loss calculation are key learning objectives.

Controls. Temperature differential controllers manage pump operation — starting the pump when the collector is hotter than the tank, stopping it when it is not. Students learn to set temperature thresholds, troubleshoot sensor faults, and understand hysteresis settings.

Safety. Stagnation — when the system overheats because the tank is full and no heat is being drawn — is a critical safety topic specific to solar thermal. Students must understand pressure relief, steam venting, and drain-back system design.

Measurement. Solar thermal training requires temperature sensors at multiple points (collector in, collector out, tank top, tank bottom, ambient), flow meters, and irradiance measurement. The key performance metric is collector efficiency — thermal energy gained divided by solar energy received — which requires real-time data acquisition.

For institutions that already run HVAC or plumbing programmes, the overlap in skills (pipe fitting, pump installation, pressure testing, fluid handling, control wiring) means solar thermal training equipment integrates naturally into the existing lab infrastructure.

How to Specify Solar Thermal Training Equipment

Solar thermal training equipment is a smaller market than solar PV, with fewer vendors and less product variety. This makes specification more straightforward, but also means the differences between products matter more.

Key specification criteria:

Collector type. Does the system include flat plate, evacuated tube, or both? For a comprehensive programme, both types allow comparative experiments that teach students when each technology is appropriate.

Real vs simulated heat source. Some systems use real solar collectors (outdoor installation required). Others simulate solar input using electric heating elements or lamp arrays. Real collectors teach installation skills. Simulated sources provide consistent lab conditions. The same trade-off applies as with solar PV training — ideally, programmes use both.

Working pressure and temperature. Solar thermal systems operate at higher temperatures than students might expect — stagnation temperatures can exceed 200°C in evacuated tube collectors. Ensure the training system includes appropriate safety features (pressure relief, temperature limits) and that students learn to work with these parameters safely.

Integration with existing HVAC lab. If your institution already has heating and plumbing training equipment, look for solar thermal systems that can integrate with existing hot water or heating circuits. This demonstrates real-world application — solar thermal as a heat source feeding into a conventional heating system — and avoids standalone installations that feel disconnected from practice.

Instrumentation depth. At minimum: temperature measurement at collector inlet/outlet, tank top/bottom, and ambient. Flow rate measurement. Irradiance measurement. Data logging and software visualisation to calculate collector efficiency and system COP. Without proper instrumentation, the system is a demonstration tool, not a training tool.

Curriculum and certification alignment. In the UK, solar thermal installation falls under MCS certification. In the EU, various national qualifications cover solar thermal as part of renewable heating. Ensure the training system supports the practical competencies these certifications require.