Ref Tools vs Ductwise

Get the guidance, support, information, and tools you need—on the job and in the field. Ref Tools is a free, powerful app that contains essential tools every HVACR technician needs in their digital toolbelt. Ref Tools offers a collection of useful air conditioning and refrigeration tools: Refrigerant Slider As a featured part of Ref Tools, you get all the features and functionality that made Refrigerant Slider a hit with millions of installers around the world. Quickly calculate pressure/temperature ratios and find essential information on over 80 refrigerants. Magnetic Tool Test and troubleshoot solenoid valve coils quickly and easily. Troubleshooter Get help diagnosing issues in refrigeration systems, so you can quickly identify symptoms and find recommended solutions. Product Finder Find extensive product-related data in one place. Search by product code number or product category to access and share product specifications, documentation, visuals, and more. Spare Parts Access and order an extensive list of Danfoss spare parts and service kits for air conditioning and refrigeration applications. Low-GWP Tool Find and compare climate-friendly refrigerants for retrofitting by checking compatibility with the TXV. TXV Superheat Tuner Optimize superheat in less than 15 minutes. Using advanced algorithms, TXV Superheat Tuner provides valve-specific adjustment recommendations. Podcasts The workday can be full and the road long, so Ref Tools also provides you with some educational entertainment. You can listen to podcasts, including the popular Chilling with Jens podcast, directly in the app. So, take a break and chill out a bit while learning something new about refrigeration. More about Refrigerant Slider Refrigerant Slider, now a part of Ref Tools, helps you quickly calculate the pressure-to-temperature ratio for more than 80 refrigerants, including natural refrigerants such as ammonia and transcritical CO2. Refrigerant Slider also provides you with information about each refrigerant, including Global Warming Potential (GWP) and Ozone Depleting Potential (ODP). You can switch between the IPCC AR4 and AR5 values, where AR4 values are used in relation to the European F-Gas regulations. Refrigerant Slider’s P/T calculations use extended curve–fitting models based on Refprop 10 results. You can also see both dew and bubble point for refrigerants with glide. Streamline your workflow Ref Tools goes beyond just providing quick access to helpful tools; it helps you save time by allowing you to track your most visited service sites and save unique settings for each one. Simplify each service call with ease. Feedback Your input matters – we would love to hear it from you. We're committed to continuously improving Ref Tools to meet your needs. If you encounter a bug or have a feature suggestion, please use the in-app feedback function available in Settings. Alternatively, you can reach us via email at coolapp@danfoss.com. Danfoss Climate Solutions At Danfoss Climate Solutions, we engineer energy-efficient solutions to help the world get more out of less. Our innovative products and solutions enable a decarbonized, digital, and more sustainable tomorrow, and our technology supports a cost-efficient transition to renewable energy sources. With a strong foundation in quality, people, and the climate, we drive the energy, refrigerant, and food system transitions needed to achieve climate goals. Read more about us at www.danfoss.com. Terms and Conditions apply for use of the app.

Ductwise sizes ductwork the way the standards do — and shows you the numbers behind the answer. Type the airflow and the friction rate you design to. Ductwise gives you the exact round duct, the next size you can actually buy, the resulting velocity, and the rectangular equivalent for the same friction and flow. No chart, no cardboard slide rule, no guessing. BUILT FOR THE JOB • Big, high-contrast numbers you can read on a roof in daylight • Large touch targets that work with gloves on • Dark mode for plant rooms and night shifts • Every calculation works offline — no account, no sign-in • Metric and imperial, switched with one tap WHAT IT CALCULATES • Equal-friction and velocity duct sizing • Next manufactured size, so the answer is something you can order • Rectangular and flat-oval equivalents, with an aspect-ratio warning • Friction rate, velocity, velocity pressure, Reynolds number, friction factor • Total pressure loss: straight run plus fitting loss coefficients • Free area, hydraulic diameter, circular equivalent, surface area for insulation • Airflow from room volume and air changes per hour • Airflow from a sensible heating or cooling load THE METHOD, IN THE OPEN Friction comes from the Darcy–Weisbach equation, with the friction factor solved iteratively from Colebrook–White using the hydraulic diameter and the actual mean velocity. Circular equivalents use the Huebscher relation for rectangular duct and the ASHRAE relation for flat oval. Duct roughness follows the standard material categories, from smooth PVC to flexible duct. With Pro, air density and viscosity are computed from your air temperature and site altitude instead of being assumed. That matters: a mile above sea level, air is about 17 % lighter, and every rule-of-thumb constant quietly drifts with it. The app always shows you the density it used. You can read the full method inside the app. A calculator that will not tell you what it is doing does not deserve your trust. FREE AND PRO Round duct sizing, airflow from air changes and the core analysis are free and complete — no time limit, no nag screens. The free version keeps three saved calculations and shows a small banner advert on the Projects screen. Ductwise Pro is a single one-time purchase. No subscription. • Rectangular and flat-oval ducts • Fitting losses and total system pressure • Airflow from heating and cooling loads • Real air density — altitude and temperature • Unlimited saved projects • Share a clean report with your client • No ads PRIVACY Nothing you type into Ductwise leaves your device. The advert in the free version is served by Google AdMob, which receives device and advertising data to show it. In the EEA, the UK and Switzerland you are asked for consent first. Ductwise then asks, through Apple's tracking prompt, whether ads may be personalised: if you allow tracking, Google may use your device's advertising identifier; if not, every ad is non-personalised. The app works exactly the same either way. Pro removes advertising entirely. Ductwise is an engineering aid. It does not replace the designer's judgement or the codes that apply to your project — always check results against the standard in force.