Efficient Heating Solutions

A while back, I mentioned I was considering replacing my gas heating with a heat pump. Being a techno-economics expert (it's part of my job!), I wanted to ensure my decision made sense both financially and environmentally. Here's what I did. 1. Gathered Quotes I reached out to several suppliers. Octopus Energy provided quotes for their Cosy 6 and the Daikin Altherma heat pumps. A local supplier recommended a Panasonic Aquaera L - which looks quite nice! 2. Analysed Energy Efficiency (SCOP) Instead of just looking at the Coefficient of Performance (COP), I focused on the Seasonal Coefficient of Performance (SCOP), which represents annual efficiency across all seasons at different flow temperatures. At a 45°C flow temperature (the max I expect I'd need), here's how they compared: Cosy 6: Baseline efficiency. Daikin: ~10% more efficient than Cosy 6. Panasonic: ~10% more efficient than Daikin. 3. Considered Sound Levels Heat pumps I analysed operate at max 55-58 decibels, quieter than my current gas boiler (~65 decibels). 4. Calculated Total Cost of Ownership (TOC) Over 15 years (conservative heat pump lifespan), I factored in installation costs, operational expenses, maintenance, and potential property value increase (studies suggest a heat pump can increase home value by ~3%). Key Insights Heat Demand: My home uses about 5,000 kWh annually for heating, which is a benefit of its well-insulated, two-year-old construction. Operational Costs: Electricity - At 22p per kWh, annual running costs range from £270 to £330 across the considered heat pump models. Maintenance - With Octopus Energy, maintenance is £9/month (£109/year) for Cosy 6 and Daikin. Panasonic requires third-party maintenance, typically around £200/year. Investment Costs: Daikin & Cosy 6 - After the £7,500 UK grant, the net investment is about £2,000. Panasonic - After the £7,500 UK grant, the net investment is about £5,000. Total Ownership Costs: Daikin resulted in the lowest TOC among considered options, £8,074 over 15 years at 22p/kWh (standard tariff) or 6,676 at 15p/kWh (smart tariff). Hydrogen Boilers: I explored these as an alternative but found to be economically unfeasible due to high hydrogen costs (expected to be 3x natural gas prices) and higher operational expenses. TOC ~ £16,000 over 15 years. Environmental Impact Current Gas Emissions: Over 1,100 kg of CO₂ annually. With Heat Pump: ~80% reduction, bringing emissions down to less than 300 kg annually. Decision After weighing all factors, I'm leaning towards the Daikin heat pump with Octopus Energy. It offers a solid balance of efficiency, cost-effectiveness, and environmental benefit. Why I Share This I believe in making informed, data-driven decisions, especially when it impacts our planet. If you're considering a similar switch or just curious about the details, I'm happy to share my spreadsheet and chat more about the process. #Energy #HeatPump #RenewableEnergy #TechnoEconomics #Research

NEW RESEARCH: our new study on the Levelised Cost of Heat (LCOH), published in Cell Reports Sustainability shows that high-temperature heat pumps are the most cost-effective pathway to decarbonising low- and medium-temperature industrial heat. Our analysis with colleagues from the Danish Technological Institute and the Environmental Change Institute (ECI), University of Oxford finds that heat pumps leveraging excess heat and thermal energy storage can cut heating costs by up to 40% compared to biomass, up to 75% compared to hydrogen systems  and undercut even heat from natural gas - while reducing emissions at scale. Even under high electricity prices, they remain the most efficient and economical option for process heat up to 150°C. Massive thanks to my coauthors Wiebke Brix Markussen, Morten Herget Christensen, PhD, Benjamin Zühlsdorf and Brian Elmegaard. Full paper here: https://lnkd.in/enVbBGGp

Heat Pumps or Gas Heating, what is better? Some facts, and a personal account Last week, Prof. Dr.-Ing. Markus Koschlik published some insightful data on the use of Heat Pumps (in German) here on LinkedIn, which I would like to share here, enriched by our personal experience: 💡 Heat Pumps generate on average between 3.5 and 4 kWh of heat from 1 kWh of electricity - far more than fossil heating systems with an "efficiency" of only 85-95%. Modern devices work well even at -20 °C. 💡 Heating circuit temperatures below 55 °C are usually sufficient to use heat pumps efficiently in existing buildings - without extensive renovation. 💡 Heat Pumps reduce CO2 emissions by up to 80% compared to gas heating systems. Powered by green electricity, they heat with almost no emissions. 💡 Modern Heat Pumps are made of 80% recyclable materials. Environmentally friendly refrigerants and fully recyclable components are increasingly coming onto the market. 💡HPs can relieve the load on the power grid through intelligent load management by using excess electricity and balancing peaks. 💡Wastewater heat pumps, which use the constant high temperature in sewage pipes, can cover up to 30% of the heat demand in cities. 💡HPs currently cost around €10k to €25k, gas heaters €5k to €9k (without installation). But falling prices for heat pumps (forecast: up to 20% by 2030) and rising operating costs of fossil systems due to CO2 pricing are reversing the short-term cost advantage. 💡HPs are widespread in Scandinavia despite the significantly lower temperatures there. In Sweden, Norway and Finland, five to ten times more heat pumps were installed per 1,000 households in 2022 than in Germany. 💡 Whether it's a refrigerator, a modern tumble dryer or air conditioning - the principle of heat pumps has long been an integral part of our everyday lives.   And we, family Riedel? We installed a Heat Pump in our 1796 - renovated farm house in 2022 (see the images), and changed nothing inside (piping and radiators kept the same). 👉 We previously needed 20,000 kwh of gas (at 10 Cents) for heating, with roughly 4 tons of CO2-emissions. 👉 Last year we now needed 4,800 kwh of electricity for the Heat Pump (at 23 Cents), making our heating costs 900 EUR cheaper on the year, with only 270 kg of total CO2 emissions, since we only use renewable electricity. Would we do it again? You bet! …………. 🙋♂️ My name is Tim Riedel, founder of planetgroups. Through our Climate Business Challenge and supporting Employee Green Teams we make sustainability a driver of innovation and business success. Please follow me or reach out to learn more.

A Finnish startup is storing renewable energy in sand. Their Sand Battery can hit 600°C, store energy at 90% efficiency, and deliver heat to industries for days. And it's already working at scale. Polar Night Energy developed this large-scale thermal storage system to solve renewable energy's biggest weakness: intermittency. When the sun isn't shining and wind isn't blowing, industries still need heat. The solution: Banking heat in sand! Storage & Output ↳ Stores renewable energy as 600°C heat ↳ Delivers hot water, steam, or air up to 400°C ↳ Scales from 2MW to 10MW (and beyond) ↳ 85-90% round trip efficiency Applications ↳ District heating systems ↳ Food & beverage processing ↳ Chemical manufacturing ↳ Metal production ↳ Pulp & paper mills Grid Integration ↳ Balances renewable energy fluctuations ↳ Provides frequency regulation ↳ Enables stable industrial heat supply ↳ Cuts operational costs By 2030, this could save over 100 Mt of CO2e annually - equivalent to 3% of current EU emissions. The impact on European industry could be massive. Many industrial processes require constant high-temperature heat, traditionally supplied by fossil fuels. The Sand Battery provides this heat from renewable sources, reliably and efficiently. Unlike battery materials, sand is abundant and locally available. No complex supply chains, no rare earth minerals, just practical thermal storage at industrial scale. Which industries do you see benefiting most from reliable renewable heat?

I introduced new permit reform legislation to make it easier, faster & more affordable for folks to install heat pumps in their homes & buildings. Heat pumps reduce energy costs & are key for our transition to a carbon-free energy future. SB 282 expedites permitting & installation of heat pumps by: —Requiring automated app-based permitting for heat pumps —Requiring one unified permit for heat pumps, instead of numerous —Allowing self-certification by qualified contractors —Limiting the ability of HOAs to put additional requirements on heat pumps —Standardizing permit fees for heat pumps Heat pumps are a highly efficient, zero carbon option for heating/ventilation/air conditioning (HVAC) systems & water heaters that make heating & cooling homes cleaner, safer & more affordable. Because heat pumps are so energy efficient (reducing electricity use for heating by up to 75%) the average household can save nearly $400/year in energy costs by switching. When paired with solar &/or battery systems & outfitted with demand response capabilities, heat pumps can save residents even more. Replacing fossil fuel HVAC or water pump systems with heat pumps also eliminates harmful pollutants those systems release into homes, improving the health of Californians & slashing climate emissions dramatically. Heat pumps also include air filtration capabilities that reduce indoor air pollution.

Why your next furnace might be powered by the earth itself We're so focused on air-source heat pumps that we're overlooking a game-changing solution right beneath our feet. It's time to talk about geothermal. Key insights: • New geothermal heat pump achieves unprecedented 5.2 COP • Compatible with existing ductwork in older homes • Avoids costly electrical panel upgrades The opportunity:  Geothermal could slash home heating emissions while lowering energy bills. This tech might finally make it mainstream. Why it matters: 1. Dramatically expands clean heating options for existing homes 2. Reduces strain on the electrical grid during winter peaks 3. Creates new jobs in installation and maintenance But here's the challenge: Scaling geothermal requires more than just better tech. We need a whole-systems approach to drive adoption. Dandelion Energy's innovative strategy: • Proprietary heat pump design tackles key barriers • Building nationwide network of trained installers • Leveraging data for continuous improvement This isn't just about better HVAC. It's about reimagining how we heat our homes for a clean energy future. Question for the energy community: How can we accelerate geothermal adoption beyond single-family homes? What policy or business model innovations could unlock this technology for multifamily and commercial buildings? Let's rethink our approach to building electrification. The solution to clean, affordable heating might be right under our noses – or rather, our feet. #GeothermalRevolution #CleanHeating #EnergyTransition

Controlling my building energy usage without sacrificing my occupant's comfort!! To conserve energy in Building Automation Systems (BAS) without compromising occupant comfort, implementing the following control sequences can be highly effective: Optimal Start/Stop: Optimal Start: Automatically starts HVAC equipment at the latest possible time to ensure the desired temperature is reached by the start of occupancy. Optimal Stop: Turns off HVAC equipment earlier than normal if the building's thermal inertia can maintain comfort levels until the end of occupancy. Demand-Controlled Ventilation (DCV): Adjusts ventilation rates based on occupancy levels using CO2 sensors, ensuring fresh air supply meets demand without over-ventilating, thus saving energy. Temperature Setback/Setup: Setback: Reduces heating setpoints during unoccupied periods. Setup: Increases cooling setpoints during unoccupied periods. Ensures that HVAC systems are not running at full capacity when the building is unoccupied. Night Purge: Uses outdoor air to cool the building during night-time when outdoor temperatures are lower, reducing the cooling load for the next day. Economizer Control: Uses outside air for cooling when the outdoor conditions are favorable (cooler than the indoor conditions), minimizing the use of mechanical cooling. Chilled Water Reset: Adjusts the temperature of chilled water based on building load and outdoor temperature, improving chiller efficiency. Heating Water Reset: Adjusts the temperature of heating water based on outdoor temperature, optimizing boiler performance. Variable Air Volume (VAV) Systems: Adjusts the airflow rate to match the actual load in each zone, reducing fan energy and reheat requirements. Lighting Control: Integrates lighting with BAS to use occupancy sensors, daylight harvesting, and scheduled control to minimize energy use while maintaining adequate lighting levels. Fan Speed Control: Uses Variable Frequency Drives (VFDs) to adjust fan speeds based on actual demand, reducing energy consumption of HVAC fans. Zone-Level Control: Implements more granular control at the zone level to respond more precisely to local temperature and occupancy variations, improving overall system efficiency. Free Cooling (Water-side Economizer): Uses cooling towers to provide cooling when outdoor conditions are suitable, reducing the need for mechanical cooling. Implementing these control sequences can significantly reduce energy consumption while maintaining occupant comfort by ensuring that HVAC and other building systems operate efficiently and only when necessary.

Heat Exchanger: A hHeat Exchanger is a device designed to transfer heat between two or more fluids (liquids or gases) without mixing them. Heat exchangers are widely used in various industries, including HVAC, power plants, refrigeration, chemical processing, and automotive systems. #Types_of_Heat_Exchangers 1. Shell-and-Tube Heat Exchanger - Consists of a series of tubes enclosed in a shell. - One fluid flows inside the tubes, while the other flows outside (shell side). - Common in oil refineries and large-scale industrial processes. 2. Plate Heat Exchanger - Uses metal plates to transfer heat between fluids. - Compact and efficient, often used in HVAC and food processing. - Types: Gasketed, brazed, or welded plates. 3. Double-Pipe (Hairpin) Heat Exchanger - Simple design with one pipe inside another. - Used for small-scale applications or high-pressure cases. 4. Finned-Tube Heat Exchanger - Tubes have fins to increase surface area for better heat transfer. - Common in air conditioning and car radiators. 5. Regenerative Heat Exchanger - Uses a temporary heat storage medium (e.g., ceramic) to transfer heat. - Used in high-temperature applications like steel furnaces. 6. Adiabatic Wheel Heat Exchanger - Uses a rotating wheel to transfer heat between fluids. - Applied in waste heat recovery systems. #Key_Applications - HVAC Systems: Air conditioners, heaters. - Power Plants: Condensers, boilers. - Refrigeration: Evaporators, condensers. - Automotive: Radiators, oil coolers. - Chemical Processing: Reactor cooling, distillation. #Heat_Transfer_Mechanisms - Conduction: Heat transfer through solid walls (e.g., tube walls). - Convection: Heat transfer between fluids and surfaces. - Radiation: Minor role in most exchangers (significant in high-temp applications). ### Efficiency Factors - Surface Area: Larger area improves heat transfer. - Flow Arrangement: - Counter-flow (most efficient, fluids flow in opposite directions). - Parallel-flow (simpler but less efficient). - Cross-flow (common in air-cooled exchangers). - Material Thermal Conductivity: Metals like copper, aluminum, and stainless steel are commonly used.

Heat Exchangers – Where Heat Meets Efficiency Heat exchangers are vital to almost every process industry refining, petrochemicals, power, food, pharma. They allow us to transfer thermal energy from one medium to another efficiently, safely, and without mixing fluids. Key Types & Where They're Used: 1. Shell & Tube Heat Exchangers Most common in heavy industries Great for high pressure and temperature Easy to clean and maintain (especially in dirty services) Ideal for steam generation and process heating 2. Plate Heat Exchangers Compact, with large surface area per volume Ideal for space-saving and efficient low-viscosity fluid transfer Often used in HVAC systems, food processing, and pharma 3. Air-Cooled Heat Exchangers (ACHEs) Used where water is scarce or expensive Fans cool the hot fluid via ambient air Common in gas plants and remote installations 4. Double Pipe Exchangers Simple and cost-effective Used in pilot plants or small-scale processes Easy to install, but not suitable for large heat duties Working Principle: Two fluids flow in close proximity, separated by a conductive barrier (metal). Heat moves from the hot fluid to the cold fluid via conduction and convection. Flow configurations like counter-current, co-current, and crossflow impact efficiency. Why It Matters: Efficient heat exchange reduces fuel consumption, lowers emissions, and improves overall plant economics. Whether it’s preheating feed, recovering heat from hot effluent, or condensing vapor, the design of your exchanger directly impacts energy use and equipment longevity. Have you ever optimized a heat exchanger in your plant? What type do you work with most? #HeatExchanger #ProcessEngineering #ThermalSystems #PlantOptimization #EnergyEfficiency #OilAndGas #Petrochemicals #MechanicalEngineering