The document contains formulas and information related to HVAC systems. It defines key terms like tons of refrigeration, horsepower, voltage, amperage, resistance, watts, capacitance, gas laws, and geometric formulas. It also includes formulas for calculating areas, volumes, BTUs, airflow, efficiency, and sizing components like ducts, grilles, burners, and nozzles.
HOT TOPIC
TON OF REFRIGERATION,
WORK, U FACTOR, LRA (Locked rotor amps)
RPM of motor, HEAT FORMULA, GAS PIPING (Sizing – CF/hr.), CALCULATING OIL NOZZLE SIZE (GPH):
PYTHAGOREAN THEOREM, Linear Measurement Equivalents (U.S. Conventional - SI Metric)
HOT TOPIC
TON OF REFRIGERATION,
WORK, U FACTOR, LRA (Locked rotor amps)
RPM of motor, HEAT FORMULA, GAS PIPING (Sizing – CF/hr.), CALCULATING OIL NOZZLE SIZE (GPH):
PYTHAGOREAN THEOREM, Linear Measurement Equivalents (U.S. Conventional - SI Metric)
ABSTRACT
Heat/light/electrical energy is out today’s necessity and has scarcity also. Energy conservation is key requirement of any industry at all times.
In general, industries use heat energy for conservation of raw material to finished product. The source of heat energy is generally saturated or super heated steam. The steam generation is common use one boiler with carity of fuels. Whatever may be the fuel the generation should be as economy as possible which adds to the product cost. Further the usage of steam and recycling steam condensate back to boiler is an art depending on plant layouts.
In this project the steam generator is water tube boiler fired with rice husk. The steam is transferred to the tyre/tube moulds where tyres/tubes are cured while the heat is rejected to the tyres the condensate forms and this condensate is put back to the boiler. While doing so the steam is also stopped back to boiler without rejecting complete heat to the product. This gets flashed into atmosphere at feed water tank. The science of separation of condensate from steam saves energy. Better the separation more the fuel conservation.
In the steam generator the fuel is burnt to heat the water and form steam. This fuel burnt flue gas carries lot of energy, out through chimney. Prior to exhausting through the heat left in flue need to be recovered, through heat recovery mechanisms’. In this project an air-preheater condensate heat recovery unit is the major energy consuming station.
The presentation is for the engineers of HIRA POWER PLANT,. The complete calculations for calculation of boiler efficiency are described in the presentation
ABSTRACT
Heat/light/electrical energy is out today’s necessity and has scarcity also. Energy conservation is key requirement of any industry at all times.
In general, industries use heat energy for conservation of raw material to finished product. The source of heat energy is generally saturated or super heated steam. The steam generation is common use one boiler with carity of fuels. Whatever may be the fuel the generation should be as economy as possible which adds to the product cost. Further the usage of steam and recycling steam condensate back to boiler is an art depending on plant layouts.
In this project the steam generator is water tube boiler fired with rice husk. The steam is transferred to the tyre/tube moulds where tyres/tubes are cured while the heat is rejected to the tyres the condensate forms and this condensate is put back to the boiler. While doing so the steam is also stopped back to boiler without rejecting complete heat to the product. This gets flashed into atmosphere at feed water tank. The science of separation of condensate from steam saves energy. Better the separation more the fuel conservation.
In the steam generator the fuel is burnt to heat the water and form steam. This fuel burnt flue gas carries lot of energy, out through chimney. Prior to exhausting through the heat left in flue need to be recovered, through heat recovery mechanisms’. In this project an air-preheater condensate heat recovery unit is the major energy consuming station.
The presentation is for the engineers of HIRA POWER PLANT,. The complete calculations for calculation of boiler efficiency are described in the presentation
This is the comprehensive powerpoint for having a Properly Sized, Designed, Installed, and Commissioned Heating, Ventilation and Air Conditioning System.
All the technical aspects discussed will be limited to the design, application, methods for operating and control, and services of HVAC systems in the Central Utility Complex (CUC). The HVAC systems at Bahrain Airport are limited to Cooling and Air Handling Unit (AHU).
Fundamentals of HVAC Systems is a thorough introduction on how HVAC systems control temperature, air quality and air circulation in a conditioned space.
Ideal for recent engineering graduates working in the HVAC&R industry, experienced engineers entering HVAC&R from another engineering area, as well as architects, technicians, construction or building management professionals who need to increase their knowledge of HVAC systems.
This course reader can function as a stand-alone reference, or may accompany the eLearning course, Fundamentals of HVAC Systems, online modules.
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Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
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Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
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This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
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Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
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👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
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Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
Assuring Contact Center Experiences for Your Customers With ThousandEyes
Hvac formulas
1. HVAC FORMULAS
TON OF REFRIGERATION - The amount of heat required to melt
a ton (2000 lbs.) of ice at 32°F
288,000 BTU/24 hr.
12,000 BTU/hr.
APPROXIMATELY 2 inches in Hg. (mercury) = 1 psi
WORK = Force (energy exerted) X Distance
Example: A 150 lb. man climbs a flight of stairs 100 ft.
high
Work = 150 lb. X 100 ft.
Work = 15,000 ft.-lb.
ONE HORSEPOWER = 33,000 ft.-lb. of work in 1 minute
ONE HORSEPOWER = 746 Watts
CONVERTING KW to BTU:
1 KW = 3413 BTU’s
Example: A 20 KW heater (20 KW X 3413 BTU/KW = 68,260 BTU’s
CONVERTING BTU to KW:
3413 BTU’s = 1 KW
Example: A 100,000 BTU/hr. oil or gas furnace
(100,000 ÷ 3413 = 29.3 KW)
COULOMB = 6.24 X 1018 (1 Coulomb = 1 Amp)
E = voltage (emf)
I = Amperage (current)
R = Resistance (load)
WATTS (POWER) = volts x amps or P = E x I
P(in KW) = E x I
1,000
U FACTOR = reciprocal of R factor
Example:
1 R = .05U
19
= BTU’s transferred / 1 Sq.Ft. / 1ºF / 1 Hour
2. VA (how the secondary of a transformer is rated) = volts X amps
Example: 24V x .41A = 10 VA
ONE FARAD CAPACITY = 1 amp. stored under 1 volt of pressure
MFD (microfarad) = 1 Farad
1,000,000
LRA (Locked rotor amps) = FLA (Full Load Amps)
5
LRA = FLA x 5
TXV (shown in equilibrium)
46.7 Bulb Pressure
_______________
Spring
Pressure 9.7 37 Evaporator Pressure
Bulb Pressure = opening force
Spring and Evaporator Pressures = closing forces
RPM of motor = 60Hz x 120_
No. of Poles
1800 RPM Motor – slippage makes it about 1750
3600 RPM Motor – slippage makes it about 3450
DRY AIR = 78.0% Nitrogen
21.0% Oxygen
1.0% Other Gases
WET AIR = Same as dry air plus water vapor
SPECIFIC DENSITY = 1_______
Specific Volume
SPECIFIC DENSITY OF AIR = __1__ = .075 lbs./cu.ft.
13.33
STANDARD AIR = .24 Specific Heat (BTU’s needed
to raise 1 lb. 1 degree)
3. SENSIBLE HEAT FORMULA (Furnaces):
BTU/hr. – Specific Heat X Specific Density X 60 min./hr. =
X CFM X ∆T
.24 X .075 X 60 X CFM X ∆T = 1.08 X CFM X ∆T
ENTHALPHY = Sensible heat and Latent heat
TOTAL HEAT FORMULA
(for cooling, humidifying or dehumidifying)
BTU/hr. = Specific Density X 60 min./hr. X CFM X ∆H
= 0.75 x 60 x CFM x ∆H
= 4.5 x CFM x ∆H
RELATIVE HUMIDITY = __Moisture present___
Moisture air can hold
SPECIFIC HUMIDITY = grains of moisture per dry air
7000 GRAINS in 1 lb. of water
DEW POINT = when wet bulb equals dry bulb
TOTAL PRESSURE (Ductwork) = Static Pressure plus
Velocity Pressure
CFM = Area (sq. ft.) X Velocity (ft. min.)
HOW TO CALCULATE AREA
Rectangular Duct Round Duct
A = L x W A = πD2__ OR πr2
4
RETURN AIR GRILLES – Net free area = about 75%
3 PHASE VOLTAGE UNBALANCE =
100 x maximum deg. from average volts
Average Volts
NET OIL PRESSURE = Gross Oil Pressure – Suction Pressure
4. COMPRESSION RATIO = Discharge Pressure Absolute
Suction Pressure Absolute
HEAT PUMP AUXILIARY HEAT – sized at 100% of load
ARI HEAT PUMP RATING POINTS (SEER Ratings) 47° 17°
NON-BLEND REFRIGERANTS:
Constant Pressure = Constant Temperature during
Saturated Condition
BLENDS – Rising Temperature during Saturated Condition
28 INCHES OF WC = 1 psi
NATURAL GAS COMBUSTION:
Excess Air = 50%
15 ft.3 of air to burn 1 ft.3 of methane produces:
16 ft.3 of flue gases:
1 ft.3 of oxygen
12 ft.3 of nitrogen
1 ft.3 of carbon dioxide
2 ft.3 of water vapor
Another 15 ft.3 of air is added at the draft hood
GAS PIPING (Sizing – CF/hr.) = Input BTU’s
Heating Value
Example: ___ 80,000 Input BTU’s____________
1000 (Heating Value per CF of Natural Gas)
= 80 CF/hr.
Example: _________ 80,000 Input BTU’s_________
2550 (Heating Value per CF of Propane)
= 31 CF/hr.
FLAMMABILITY LIMITS Propane Butane_ Natural Gas
2.4-9.5 1.9-8.5 4-14
5. COMBUSTION AIR NEEDED Propane Natural Gas
(PC=Perfect Combustion) 23.5 ft.3 (PC) 10 ft.3 (PC)
(RC=Real Combustion) 36 ft.3 (RC) 15 ft.3 (RC)
ULTIMATE CO2 13.7% 11.8%
CALCULATING OIL NOZZLE SIZE (GPH):
_BTU Input___ = Nozzle Size (GPH)
140,000 BTU’s
OR
_______ BTU Output___________
140,000 X Efficiency of Furnace
FURNACE EFFICIENCY:
% Efficiency = energy output
energy input
OIL BURNER STACK TEMPERATURE (Net) = Highest Stack
Temperature minus
Room Temperature
Example: 520° Stack Temp. – 70° Room Temp. = Net Stack
Temperature of 450°
KELVIN TO CELSIUS: C = K – 273
CELSIUS TO KELVIN: K = C + 273
ABSOLUTE TEMPERATURE MEASURED IN KELVINS
SINE = side opposite COSINE = side adjacent
6. sin hypotenuse cos hypotenuse
TANGENT = side opposite
tan side adjacent
PERIMETER OF SQUARE: P = 4s P = Perimeter
s = side
PERIMETER OF RECTANGLE: P = 2l + 2w P – Perimeter
l = length
w = width
PERIMETER OF TRIANGLE: P = a + b + c P = Perimeter
a = 1st side
b = 2nd side
c = 3rd side
PERIMETER OF CIRCLE: C = πD C = Circumference
C = 2πr π = 3.1416
D = Diameter
r = radius
AREA OF SQUARE: a = s2 A = Area
s = side
AREA OF RECTANGLE: A = lw A = Area
l = length
w = width
AREA OF TRIANGLE: A = 1/2bh A = Area
b = base
h = height
AREA OF CIRCLE: A = πr2 A = Area
π = 3.1416
A = π D2 r = radius
4 D = Diameter
VOLUME OF RECTANGULAR SOLID:
7. V = l wh V = Volume
l = length
w = width
h = height
VOLUME OF CYLINDRICAL SOLID:
V = πr2h V = Volume
π = 3.1416
V = π D2h r = radius
4 D = Diameter
h = height
CAPACITANCE IN SERIES:
C = ______1________________
1 + 1 + . . . . .
C1 C2
CAPACITANCE IN PARALLEL:
C = C1 + C2 + . . . . .
GAS LAWS:
Boyle’s Law: P1 V 1 = P2 V 2 P = Pressure (absolute)
V = Volume
Charles’ Law: P1 = P2 P = Pressure (absolute)
T1 T2 T = Temperature (absolute)
General
Gas Law: P1 V 1 P2 V 2 P = Pressure (absolute)
_____ = _____ V = Volume
T1 T2 T = Temperature (absolute)
PYTHAGOREAN THEOREM:
C2 = a2 + b2 c = hypotenuse
a & b = sides