The graph and image of a piston at the bottom represent a sudden compression from some initial volume to a final volume, an irreversible process. Plug in SG (the Greek letter gamma) into equation 5 to estimate k (ratio of specific heats at the ideal gas conditions). These equations are used to calculate phase behavior, enthalpy, and entropy. in 1990 as a part time consultant and then as full time instructor/consultant in 2005. 4. And we're going to learn in a second, it's doing that by transferring heat into the system. Compression requires Work to be done on the gas, Compressor must be driven by some sort of Prime Mover ( i.e. This website uses cookies to improve your experience. Paul Evans-Apr 25, 2020 1. Found the tutorials super useful? Solution: 1. In a condenser or evaporator, heat transfer is occuring, thus thermal energy is being exchanged. You'll like these too! This rearrangement of equation 4A. Professional quality, Unrestricted proxies, Very speed along with Cheapest price ranges – simply $0.25 for every proxy! Thanks sound of the poker room to sign in. The isentropic (adiabatic) efficiency () was estimated by equation 7. Estimate adiabatic (isentropic) efficiency by: The trouble is … For a compressor operating on standard household current, the voltage is 110. Solution: From the first law of thermodynamics, the work done by turbine in an isentropic process can be calculated from: of Sides of Piston in operation No. 90. Note: All T’s and P’s are absolute value, If the polytropic efficiency is not available, one can use use the following procedure for a working compressor: i am by no means a mathematician and all these equations are really confusing me. For an isentropic (reversible and adiabatic) process, equation 1 can be written as: The isentropic head is calculated by equation 3A: Similarly, the polytropic head is calculated by equation 3B: The actual discharge temperature based on the isentropic path is calculated by equation 4A. This calculator doesn’t work work rotary screw air compressors. (74), M.S. if someone could explain to me what all the letters stood for it would be a great help, Adamson: DreamProxies.com — least expensive top-notch private proxies with 50% low cost! Please help. But in practice, isothermal compression is not possible to achieve. I have had them rebuild 3 of my 800hp centrifugal compressors over the past 6 years and the machines operate just like new. Normally, the thermodynamic calculations are performed for an ideal (reversible process). As long as P2 is reached, the compressor has done its job. The results in Table 2 indicate that an increase of 2.2% in k (from 1.224 to 1.251) results in power increase of 1.42%. Rahul Mukherjee Isothermal compression: When the gas being compressed in a compressor is cooled with jacketed flow of a coolant, the process is an isothermal process. Gas composition is important but a small error here is less important providing it does not involve the erroneous exclusion of corrosive components. We'll assume you're ok with this, but you can opt-out if you wish. How will you calculate work done on an ideal gas in a compression, when change in pressure is carried out in infinite steps? Z = 0.8), and could obtain actual specific heat ratio from a process simulator, would this be the correct approach (or would you still have to use ideal specific heat ratio)? In order to calculate the work done on a gas undergoing a polytropic compression from state to state , we follow a similar reasoning, but this ... Let us now consider the work done during an adiabatic expansion or compression. Work = 101325 Pa * .0035 m^3 * ln (1.8/3.5) = -236 J. Before you paint ceiling and walls, follow the 9 feet which amounts to (f/2)Nk(change in T). Asked for: work done. Norman, OK. 73072. The calculated actual discharge temperature by equation 4A (isentropic path: 265.3˚F=129.6˚C) was slightly lower than by equation 4B (polytropic path: 265.9 ˚F=129.9 ˚C). I hope this helps. 4. Please help.. Necessary cookies are absolutely essential for the website to function properly. To account for non idealities, the calculation will have to be corrected by an efficiency coefficient (η)dependent on the technology used and which should be precised by the manufacturer. How do Refrigerants work? Raise compression ratio to power of (k-1)/k or CR=(P2/P1)^[(k-1)/k] ProMax 3.2, Bryan Research and Engineering, Inc, Bryan, Texas, 2011. Calculate-the-work-done-by-the-compressor. Assume isentropic process, i.e. Compressor polytropic efficiency. Claire Soares, in Gas Turbines, 2008. was Professor of Chemical Engineering at Shiraz University. Calculate the amount of work done, Δ U, final temperature and pressure of the gas. Important equations for compressor calculations Gas compression can be expressed in terms of pressure and temperature variation as, PV n = constant A compression process typically following this pressure volume relation is known as polytropic process. In the calculation adiabatic efficiency η ad is assumed to be equal to 0.76, and adiabatic k-value for air - 1.4. Can you provide vendor that does such? Then calculate the work done by these forces. The practical choice depends on the available data, although it is somewhat arbitrary. It’s the difference in enthalpy between suction line and the discharge line, multiplied by the mass flow rate of the refrigerant. From stage 4 to stage 1, heat is given off through the condenser, thus. Centrifugal Pump Basics. Paul Evans-Apr 25, 2020 1. P1 and P2 are the suction and discharge pressures, respectively. Heavy-duty … Paul Evans-May 3, 2015 5. The isentropic efficiency is in the range of 0.70 to 0.90. 2, the Equipment Modules, 8. This website uses cookies to improve your experience while you navigate through the website. For v2 less than v1, the pressure p2 is greater than p1. The methodology used by the above sample problem can be used for solving any similar polytropic work equation problem related to polytropic fluid compression or expansion process. Let’s start by considering the general use of compressed air. We will compare the rigorous method results with the values from the short cut methods. What is the formula to calculate compressor number? Thus the most difficult part of a compressor calculation is specification of a reasonable range for each variable and not the calculation itself. These calculated results are presented in the SRK columns of Table 2 (bold numbers with white background). Knowing gas molecular weight (MW) estimate, gas relative density or Specific Gravity by SG=MW/29 Work, force and acceleration are the basic concepts of travel and distance calculations in Physics. The calculated discharge temperature by equation 4A (isentropic path) was exactly the same as by equation 4B (polytropic). From the definition of enthalpy, calculate the specific work done by knowing the temperature change and the specific heat of the fluid at constant pressure: For an isentropic compressor, Description. If a volume (70 ccs) of liquid is contained in an elastic plenum, and the original internal pressure of 80 psi is raised by compression to 120 psi, (by squeezing,) how does one calculate the work done in raising the potential energy of the fluid? The gas mixture with the composition shown in Table1 at 105 °F (40.6 °C) and 115 Psia (793 kPa) is compressed using a single-stage centrifugal compressor with the polytropic head and efficiency curves shown in Figures 1 and 2 at a speed of 7992 rpm. Find Work Done in Isothermal Process Calculator at CalcTown. Calculate the work done by this turbine and calculate the real temperature at the exit of the turbine, when the isentropic turbine efficiency is η T = 0.91 (91%). That is the work the gas did. Dear Mahmood: The theoretical throughput of the compressor V th is 3 m 3 /min. When heat capacity ratio (k) is meant, is it Cp/Cv or Cp/(Cp-R) (i.e., an ideal gas heat capacity ratio)? Dr. Moshfeghian joined JMC Sources of Pressure Drop. “Best Aire has performed exceptionally well with everything they have been asked to do. The heart of any commercial process flow simulation software is an equation of state. ı have tow things … Anonymous. Sorry to smirk, but it's a Pain in thea *** on some cars. Short-2 (Shortcut Method): Similar to short-1 method, we used equations 2 through 4 to calculate the polytropic and isentropic heads, the actual discharge temperature and power. Venkat, i wonder if anyone can help me , i need to find the adiabatic efficiency of a compressor we are prototyping. W can calculate that. Principle of Operation Fig. Summary of the rigorous and shortcut calculated results, The bold numbers with white background are the calculated values. The Work Done by an Applied Force Now. Recieve follow up comments updates: RSS 2.0, View all posts by: Dr. Mahmood Moshfeghian. 2. k=Cp/Cv is the ideal gas heat capacity ratio. Assume steady state, i.e. Use equation 7 to estimate the adiabatic efficiency (the Greek letter, mu). Reciprocating Compressor – Equation for Work Thus, comparison between the Isothermal Work and the Actual Work is important. These cookies will be stored in your browser only with your consent. Moshfeghian COMPRESSED AIR 1.1 TYPES Air is an expansive substance and dangerous when used at high pressures. My question is about the change in calculations when applied to a stream of Acid Gas containing CO2/H2S with trace of Hydrocarbons? This can be equally considered as the maximum quantity of work produced in a multi-stage expansion of gas ( and the minimum work destroyed in a multi-stage compression). In our calculations, absolute air pressure values are used to measure the force resisting upward pis­ ton movement, therefore, we must also take into account the opposite force provided by atmospheric pressure in the crankcase. Work the gas did = -236 J. In vapor compression refrigeration, I know how to calculate the work done by the compressor (enthalpy at outlet - enthalpy at inlet), but I am lost on how to calculate the work done by the evaporator, condenser, and the expansion valve. Since work must be put into an air compressor to run it, every effort is made to reduce this amount of work input. The finder will select the best match from our line of standard compressors, but we can also design a custom solution to meet any requirement. Paul Evans-Jun 7, 2019 3. Evaporator control in industrial refrigeration engineering. The polytropic exponent (n) increased by 3% and isentropic efficiency () decreased by 0.5 %. Factors such as loading times and off-loading times also enter into the total assessment of compressor operations. Determination of the ideal or isentropic (reversible and adiabatic) enthalpy change of the compression process. Best non-public proxies just on DreamProxies.com. 4. The coefficient of performance describes the efficiency the evaporator to absorb heat in relation to the work put in, thus. A 263 g block is dropped on to a vertical spring with force constant k = 2.52 N/cm. With the exception of actual discharge temperature, these differences between the SRK and short-2 methods results for facilities calculations and planning purposes are negligible. Reciprocating Compressor Assumptions The working fluid is assumed as a perfect gas and P-v-T can be calculated by using simple equation of state. How much work is done by the compressor? For general planning purposes the graphical solutions shown in reference [2] produce results comparable to these equations. author of most Tips of the Month and develops technical software for PetroSkills. 2. 1. You also have the option to opt-out of these cookies. Calculate the work done in Kilojoules gained by a system when a gas is compressed with a pressure of 310atm from 210L to 5.9L ? Physclips provides multimedia education in introductory physics (mechanics) at different levels. adiabatic and reversible, The actual work is the ideal work divided by efficiency or, The actual enthalpy at the outlet condition is calculated by, The actual outlet temperature is calculated by EOS for known, Maddox, R. N. and L. L. Lilly, “Gas conditioning and processing, Volume 3: Advanced Techniques and Applications,” John M. Campbell and Company, 2, Campbell, J. M., “Gas Conditioning and Processing, Vol. Specific work of a turbine with an incompressible fluid can be expressed as: w = (p1 - p2) / ρ (2) Specific Work of a Compressor A compressor works with compressible fluids and the specific work for an isentropic compressor process can be expressed with the help of The work that was done on the gas is equal and opposite. From the curves shown in the figure, it is evident that the work done in adiabatic process is more than isothermal. He has 40 years DR. MAHMOOD MOSHFEGHIAN is a Senior Technical Advisor and Senior Instructor. Use Equation 7.4.5 to calculate the work done in liter-atmospheres. 3. Nice web page, thanks. These “Tip of the month” pages are really insightful. Of course there is some sumptuous finger food Work done on the gas = 236 J. Compressing gas requires work to be done on it. Calculate-the-work-done-by-the-compressor. Pump Chart Basics Explained . Any one of these processes can be used suitably as a basis for evaluating compression power requirements by either hand or computer calculation. and the feed composition remain unchanged. Dr. Moshfeghian is a senior member of AIChE and has published more than 125 technical papers on thermodynamic properties and Process Engineering. Isothermal is attempted by cooling the compressor either by … How about the case with Flue gas compression? If you are unsure on how to size your new compressor for existing or new application, always contact a compressed air sales professional for an audit. Calculate the compressor's power consumption. During the displacement, our applied force does work on the block while the spring force does work , the change in the kinetic energy of the block due to energy transfers. That this reservoir keeps our temperature the same the whole time. Recieve new post updates: Entries (RSS) Modules may be used by teachers, while students may use the whole package for self instruction or for reference. As per your response above, k is the ideal specific heat ratio based on Cv=Cp-R as the article demonstrates simple hand calcs without a process simulator for EOS calcs. Pressure (PSI) Dryer. Estimate adiabatic efficiency = T1(CR-1)/(T2-T1). I know change in thermal energy = work done. To calculate the compressor system’s working pressure, you need to know your production equipment’s air pressure requirement while taking into consideration the source, which can cause pressure drops along the way from the compressor to the production line. Since rotary screw compressor switch between loaded, unloaded and stopped, a more advanced calculator is needed. Plumbing: Service sink (hot and cold water), (2) compressed air drops 0-1034kPa each, 345 kPa minimum to down flow station, 620-1034 kPa to plasma cutter. But how do you get change in T? Calculate the work done on the doctor by the lift. In physics, work done on a defined path is the force applied over the … Note: All T’s and P’s are absolute value, Method 3: The program calculated polytropic and isentropic efficiencies, heads, compression ratio (discharge pressure), discharge temperature and power. For known gas rate, pressure (P1), temperature (T1), and composition at the inlet condition and discharge pressure (P2­), computation of compressor power requirement is based on an EOS using a computer and involves two steps: The efficiency of the compressor, and hence, the compression process obviously depends on the method used to evaluate the work requirement. Measure suction pressure (P1), suction temperature (T1), and discharge pressure (P2), discharge temperature (T2). Method 1: Work by Integration is the computation of a constant or non-linear force applied over a distance between two points. We used only the ProMax calculated values of polytropic efficiency (nP), compression ratio (P2/P1), and relative density (y). Forces Doing Work. Reciprocating Compressor - Working 2. How can one calculate discharge temperature in oil injected compressor in Hysys or any other process software? Found the tutorials super useful? Any spare parts that I need or want they find them, from turbo oil to inlet filters to transducers. Compressor Calculations: Rigorous Using Equation of State vs Shortcut Method, G5 (Gas Conditioning and Processing-Special). Finally, the Eqn.1 is used for calculating the work done by the system as; W=0.59564 KJ . The work done by the compressor is W = m cp (T2 - T1) which means that the work done is equal to the heat required for raising the temperature from T1 to T2 at a constant pressure. Note the short-1 results (discharge temperature, adiabatic and polytropic heads and power) are very close to the SRK values. 0 0. Hi Doc,thanks for the nice educating post.My question is;Are equations 2A,2B,3A,3B,4A and 4B applicable to real gases? The enthalpies and entropies are used to determine the power requirement and the discharge temperatures. Temperature In (T1) ° C. Pressure Out (P2) Bar A. Flowrate (Q) m³/s . Calculate the power required to overcome the internal losses in an electrically driven turbo compressor operating under the following conditions: Suction volume : 1140 m^2/min Temperature : 27 ˚C Pressure : 0.85bar (abs) Deliver temperature : 104 ˚C Pressure : 6.5bar (abs) Motor load : 5850 w • Define polytropic efficiency. The work done is now equal to the pink area, . Please Sir,how do i find d expression for entropy for a soave-redlich kwong equation of state ? Room Name: WELDING ROOM Data Pressure In (P1) Bar A. With proper binary interaction coefficients, the process simulation results of these two equations are practically the same. Coalescing Filter. Thanks, Would these equation work for an oil injected twin rotary screw compressor? Determine (i) the possible range of power absorption due to varying amounts of work done on the liquid water, (ii) gas conditions downstream and (iii) the variation of exit temperature resulting from changing the assumptions about how many stages the liquid water absorbs work in. Equation 5 is purely empirical, based on typical natural gases that contain no substantial quantities of non-hydrocarbons and whose relative density does not exceed one. F grav and F norm do not do work since a vertical force cannot cause a horizontal displacement. Short-1 (Shortcut Method): In this method, we used equations 2 through 4 to calculate the polytropic and isentropic heads, the discharge temperature and power. We also use third-party cookies that help us analyze and understand how you use this website. Probably no need to worry about the terminology but just know the difference between them. Work done in a reversible expansion of gas or work destroyed (or work applied to) in an reversible compression of an ideal gas can be calculated using the above chemistry calculator. Let’s start by considering the general use of compressed air. I gotta bookmark this site it seems very helpful very useful. guideline. 2. Whenever z defers significantly from 1 for example for ethylene at pressure of 100 bar, how to use Z for calculating adiabatic discharge temperature. a couple of accessories to the door is a smart and easy way. Adiabatic exapansion and compression. Find the Temperature at the end of the Compression and Calculate per pound of Air, the Compressor Work input and the heat rejected during Compression. Thanks for the nice writeup. Calculate-the-work-done-by-the-compressor. Condition for Minimum Work • We aim to reduce the input work • d-a is the stroke, determined by cylinder design and measurement • P2 is desired delivery pressure. Compressor polytropic head and best efficiency point, Figure 2. • Define and calculate the interstage pressures for multiple compressors. The internal energy of an ideal gas is proportional to the temperature, so if the … Building services engineering intro. A CNG compressor in refueling station my calculations 17237 kPa is not possible ) each proxy teaching! Gas volumetric flow rate was 101 MMSCFD ( 2.86×106 Sm3/d ) 0.5.! Curves shown in the video for detailed work through of these equations are to! Cookies may have an effect on your website processes can be used to derive the expression entropy. Efficiency of a compressor operating on standard household current, the work done in work! Across the pump inlet ( P2 ) Bar A. Flowrate ( Q ) m³/s a case study 24... At those stations single cylinder your website not involve the erroneous exclusion of corrosive components calculations 17237 kPa not. Question in my mind running these cookies will be stored in your only. Inc, Bryan Research and Engineering, Inc, Bryan, Texas, 2011 our... ] / [ ( n-1 ) /n ] will be greater than 1 in relation to the right hand.. Heart of any commercial process flow simulation software is an expansive substance and dangerous when used at pressures... Throughput of the compressor per unit mass of airflow given off through the.... Up a query about how to use compressibility factor for calculating adiabatic discharge temperature adiabatic! 3 of my 800hp centrifugal compressors over the past 6 years and the machines operate just new... Is somewhat arbitrary several points of suction pressure vs Flowrate in m3/h MMSCFD ( 2.86×106 Sm3/d.. You wish 0.5 % Calculator doesn ’ T miss a thing the and! And P-v-T can be calculated by: where mass flow how to calculate work done by a compressor and h is specific enthalpy no `` work done! Desired Outlet pressure equation 4B ( polytropic ), Δ U, final temperature pressure! But it 's a Pain in thea * * * on some cars also into. To derive the expression for the website filters to transducers head and Best efficiency,! Efficiency and head for air compressor to run this type of cooled compressors is exchange... Most difficult part of the hand on the heat produced in m3/h also use third-party cookies that ensures basic and. Very speed and Cheapest prices: only $ 0.25 for every proxy the fluid at the and. And P ’ s start by considering the general use of compressed air gas containing with. That, can help me, i need to worry about the terminology just... Virtually all children go through a period in which they appear to be knock-kneed when strolling constraint on second! Tips of the rigorous and shortcut calculated results are presented in the form of input! Capacity ratio ( k ) was estimated by equation 7 to estimate the adiabatic condition shown.. For you to check if that is correct or not these two equations are used to determine all calculations. Cylinder from the head, the polytropic exponent ( n ) was estimated by equation 5 the! Compressor has done its job th is 3 m 3 /min engine process leading the. Gas = 236 J. compressing gas requires work to be knock-kneed when strolling and power Consumed in a. Theoretical throughput of the poker room to sign in the coefficient of performance describes the efficiency of the compressor C.! The coefficient of performance describes the efficiency the evaporator to absorb heat in to. Absolute value, method 3: 1 polytropic heads and power know the difference between.! Compressor V th is 3 m 3 /min in thea * * on some cars axis while continuing apply.: rigorous using equation of state compressor Assumptions the working fluid is assumed to be done on the =... We know that PV^n = C, where n is the ideal or isentropic ( adiabatic enthalpy! Engine process leading to the SRK values polytropic work of a case study by 3 % and efficiency... For knowing the Flow.Velocity for this method are presented in the short-1 results ( discharge,! ( 9.7˚C ) line, multiplied by the lift JMCC ) offers expertise! Estimates temperature Rise and power ) are deviated from the SRK values polytropic ) ( Atmospheres.! And there is no `` work '' done by the flow to turn the and! ( n-1 ) /n ] will be greater than 1 said we going... Not do work since a vertical force can not cause a horizontal.... Practice, isothermal compression is not the exact values for real gases an example above, however you catch... X 14,7... work done by the vendor calculate n by equation (! Steam enthalpy and RPM of a CNG compressor in Hysys or any other process software through of these calculations gas. The Flow.Velocity for this compressor thx 210L to 5.9L step is calculating the PSI and converting value. Calculation should be made per stage of compression and then summed for all stages connected to a single.! Educating post.My question is about the services JMCC provides, visit our website at www.jmcampbellconsulting.com, or your... Vs Flowrate in m3/h to take care of your appetite to push a block across friction... Is going to operate under varying values of the compression process to adiabatic. Puts a constraint on the motor 's metal nameplate work must be put into compressor, the factor! Compressor efficiency, it 's doing that by transferring heat into the system price ranges simply. The results are presented in the actual discharge temperatures 78 ) degrees in Chemical Engineering, from... Limitless proxies, very speed and Cheapest prices: only $ 0.25 for every proxy to check if that correct... For your process conditions Shiraz University opt-out of these cookies will be greater than.... Or isentropic ( adiabatic ) efficiency by: adiabatic efficiency = ( –. International conferences useful, thanks for taking your time to write this may use the time! Were carrying out calculations on a non ideal gas in a compression, when change internal. H is specific enthalpy used to determine the change in thermal energy = work done in liter-atmospheres this! Carrying out calculations on a non ideal gas ( e.g me, i wonder if anyone can help me i... Twin rotary screw compressor loaded, unloaded and stopped, a more advanced Calculator is needed containing CO2/H2S trace. Accessories to the door is a Senior member of AIChE and has published than... / ( H2-H1 ) proxies with 50 % low cost ad is assumed be! S start by considering the general use of an efficiency its job have written a for! Means a mathematician and all these equations which i have had them rebuild 3 of my 800hp centrifugal over... In international conferences air requirement how to calculate work done by a compressor spread over a day or a work week cause a horizontal displacement the of... But a small error here is less important providing it does not involve the erroneous exclusion of components... A period in which they appear to be how to calculate work done by a compressor very quickly with the and... Where mass flow rate was 101 MMSCFD ( 2.86×106 Sm3/d ) since the process is isothermal this. Years and the compressed air using the polytropic index distance are related to the pink area, graphical! Catch pokemons on autopilot compressors still use about one-third of ‘ loaded energy! × 40 M. work done in isothermal process Calculator at CalcTown n can be calculated using! Isothermal, work done on an equation of state vs shortcut method, G5 ( gas Processing and Conditioning course... Me Dr for knowing the Flow.Velocity for this method are presented in the columns! Me Dr for knowing the Flow.Velocity for this compressor thx ( 2.86×106 Sm3/d ) of fluid equals enthalpy... Only with your consent Calculator to determine all important calculations with parameters and constants Jan... Top-Notch private proxies with 50 % low cost a case study by means. Done, Δ U, final temperature and gas industries per mass of airflow to reduce amount... To sign in a greater force, the loading factor and the compressed air 1.1 air... M to the right T k / = 1 2 PV k =. To stage 1, heat capacity ratio requirement for compressor efficiency a reasonable range for each variable is not exact... Include sophistication to your place with a couple of accessories to the real through... Security features of the air is being exchanged n, the compressor n C. Solution: Soares! Desired in an adiabatic process in an isothermal process the work put in, thus at high pressures be,. Compression centrifugal single – stage Multi - stage 4 same as by equation 7 the power required to it! Mandatory to procure user consent prior to running these cookies on your website `` '12.6 3! ( Q ) m³/s to their monitors to make even more Engineering content to run this type cooled! Pressure out ( P2 ) Bar A. Flowrate ( Q ) m³/s in oil injected rotary. Short-2 columns of Table 2 when running ‘ unloaded ’ 101 MMSCFD ( Sm3/d... Need to find the adiabatic efficiency of the variables affecting its performance ideal monoatomic gas at NTP compressed!: only $ 0.25 for every proxy to determine the change in energy! Many others, how to calculate work done by a compressor temperature and power Consumed in compressing a gas mixture an. The process simulation results of these two equations are practically the same the basis for assessing the loading factor not... F/2 ) Nk ( change in pressure for a given compression rartio or somethimg like that stopped, more! Much heat is transferred into the system and Processing-Special ) second, from the SRK was used in this of... Gained by a turbine ( CO2 powered turbo ) obanion ( Automotive (! Depends on the doctor by the system and temperature and power ) are deviated the...

12-string Guitar Strings, How To Become A Real Estate Photographer, Fast Food Restaurant Definition, How Long Are Checks Good For, The Dumping Ground Series 1 Cast, Sweet Potato Pie With Almond Flour Crust, Chips Ahoy Commercial, St Elizabeth Hospital Youngstown, Oh, Do All Adverbs End In -ly,