Thermonova DELTA Modular Heat Pump
Large Delta T Heat Pumps
Heat pumps are a key part of the UK’s heat decarbonisation strategy, so careful selection is essential to ensure optimal building performance.
The benefits of heat networks with large delta T distribution circuits is well understood, but the potential of natural refrigerants can also be unlocked when large delta T is applied to the heat pump itself.
Using Propane (R290) with a large delta T (eg 30°) maximises the heat transfer from the refrigerant to the outlet water, reducing the electricity consumption by the compressor and increasing the efficiency or SCOP.
Lower return temperatures reduce heat pump operating cost and carbon footprint.
DELTA Series – Possible configurations
DELTA Modular Heat Pump product range
In this table you will see all the relevant key data for the heat pump product range:
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| Key Statistics | DELTA-HP1 | DELTA-HP2 | DELTA-HP3 | DELTA-HP4 |
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| Type | Monobloc Air Source | |||
| Application | Commercial Buildings / Heat Network (Heating & DHW) | |||
| Maximum Capacity (kW) | 115 | 207 | 341 | 418 |
| Capacity @-5°C ambient (kW) | 90 | 177 | 265 | 351 |
| Nominal COP (Ambient 7°C, 45/30) | 3.67 | 3.87 | 3.95 | 3.99 |
| Maximum Flow Temperature (°C) | 70°C | |||
| Refrigerant (GWP) | R290 Propane (3) | |||
| Electricity Supply | 400V/50Hz/3-Phase | |||
Decarbonization
Propane (R290) heat pumps play a crucial role in reducing the carbon footprint of district heat networks. By using a natural refrigerant, they avoid negative environmental impacts and further support decarbonization efforts.
High-grade Heat
Propane as a refrigerant can achieve high-grade heat without affecting the efficiency of the heat pump. With a flow temperature of up to 70°C , propane heat pumps are ideal for a variety of applications and for optimizing thermal storage use.
Energy Efficiency
DELTA Propane heat pumps are sensitive to return temperature. Ideally, return should be below 45°C. As return temperature decreases, delta T increases, and SCOP improves. This directly reduces the electricity consumption, cost of operation and carbon footprint.
Natural Refrigerant:
Unlike synthetic refrigerants such as CFCs, HCFCs, HFCs, and HFOs Propane is a natural refrigerant that has a global warming potential of 3 and does not cause any harmful impacts. It is an ideal alternative to synthetic refrigerants that are being phased out or planned for phase-down.
Heat pumps in a hybrid energy centre
In a hybrid energy centre, heat pumps are sized to provide the maximum share of energy (kWh) but are not sized to the peak building load (kW) as this is extremely expensive and results in over-sized, under utilised appliances. Hence, cost effective peak capacity should be provided by boilers.
Heat pumps use a vapour refrigeration cycle to generate hot water
by harvesting energy from a lower temperature source. This source is generally air or water, and could be from the ambient air, exhaust air, river water, bore hole, mine water and many others. The input energy is electricity to power compressors and fans if the source is air. Efficiency is the ratio of heat output divided by electricity input, known as COP (Coefficient of Performance). Seasonal performance over the whole year is known as SCOP – Seasonal Coefficient of Performance.
DELTA Modular Heat Pump documents
Please find relevant links for further reading below, or visit our downloads page.
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