Q.1 An air conditioning system supplying air to a space with a sensible heat load of 14 kW and alatent heat load of 9 kW has a cooling coil and a bypass path as shown schematically in Fig. The db-temperature of the space is maintained at 26°C. The dry air mass flow rate of supply air is 1.2kg/s.Outdoor ventilation air at 34°C db-temperature and 50% relative humidity is introduced into thesystem with a dry air mass flow rate of 0.26 kg/s. The air leaving the cooling coil is fullysaturated at a db-temperature of 6°C. The pressure is constant at 101.3 kPa. Determinedb-temperature and relative humidity of the supply air to the space,(ii)(i)(ii)(iv)wb-temperature of the space,temperature of the air entering the cooling coil, andrefrigeration capacity of the cooling coil.

Given data , SHF=0.55 WBT=31.5°C t2=DBT=40°C , Total heat load = 140…

Answered: Q.1 An air conditioning system…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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A furnace heating unit has an airflow of 2,500 CFM. The heating coil entering temperature is 35°F dry bulb temperature with a relative humidity of 30%. the furnace heating coil leaving temperature is 80°F dry bulb temperature. Plot the points and the process line on the psychrometric chart. Find the sensible, latent, and total loads of the coil. (hint: heating does not change the moisture content in the air) OUTSIDE AIR 2,500 CFM 35°F DRY BULB TEMP. 30% RELATIVE HUMIDITY FURNACE 80°F DRY BULB TEMP. 2 SUPPLY AIR
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/ A hall is to be maintained at (20 °C DBT, 60 % RH) when the outdoor conditions are (40 °C DBT, 26 °C WBT). With the following conditions: Sensible heat load in the room Latent heat load in the room 66000 kJ/hr 20000 kJ/hr 30 m/min 5 °C Infiltrated air Apparatus dew point temperature. If the 60 % of the total air is recirculated from the hall and is mixed with the conditioned air after the cooling coil. Find the following: 1-The conditions of air leaving the conditioner. 2- Mass of fresh air entering the cooler. 3- Bypass factor of the cooling coil. 4- The refrigeration capacity of the cooling coil in the tons of refrigeration o 0a DDT
QUESTION 1 Water at 60°C leaving a condenser at the rate of 22.5kg/s is sprayed into a natural-draught cooling tower and leaves it at 27°C. Air enters the tower at 1.013bar, 13°C and 50% relative humidity and leaves it at 38°C, saturated. Take Cp for the superheated vapour as 1.86 kJ/kgK. Calculate: 1.1. the air flow rate required in m/s; 1.2. the make-up water required in kg/s.
1. An air-conditioned space is maintained at 25 °C and 50% relative humidity. The outside conditions are 40 °C DBT and 25 °C WBT. The space has a sensible heat gain of 24.5 kW. The conditioned air is supplied to the space as saturated air at 10 °C. The equipment consists of an air washer such that the air entering to it comprises 25% outside air and the remainder being recirculated room air. Calculate: - A. The volume flow rate supplied to the space. B. The latent heat gain to the space. C. The cooling load of the air washer.
Using a psychrometric diagram, describe the process and humidification of the following data. Initially the air was at a dry bulb temperature (DBT) of 35 ° C and RH of 45%. The air is heated to DBT 85 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. For this process, calculate, a.a. Change in absolute humidity of air from initial to final conditions. = (kg water / kg air).b. The change in air enthalpy from initial to final conditions. = (kJ / kg air)
Using a psychrometric diagram, illustrate the heating and humidifier process from the following data. Initially the air was at dry bulb temperature (DBT) 40 ˚C and RH 30%. Air is heated to DBT 90 ˚C. The heated air is then flowed through a humidifier to increase the RH to 25%. For this process, calculate, a. Change in absolute humidity of air from initial to final conditions = kg water / kg air). b. The change in air enthalpy from initial to final conditions. = (kj / kg air)
1- An air conditioned space is maintained at DBT= 24 č and RH=50% .The out side condition is DBT=38 ċ with WBT= 27 c .The space has a sensible heat gain of 24 kW and latent heat gain of 6 kW. Use all out side air system and find :- a) the supply condition of the air if the relative humidity at the supply point is taken to be 90% . b) volume flow rate of supplied air. c) the total cooling load of the cooling coil. d) the chilled water volume flow rate if its temperature rise is 5.6č. ( answer : T,= 12.2 c , h, = 32.6 kJ/kg , Qeoi =95.6 kW , 4.06e-3 m'/s ) 2- The sensible heat gain of a given space is 50 kW and its latent load is 15 kW. The inside design condition is 26 c with 50% relative humidity. The space is air conditioned using all return air system Find by assuming 90% saturation for the supply air . a) the supply conditioned of the air air c) cooling coil load. b) volume flow rate of supplied
A space is to be maintained at 22C and 50% relative humidity. The sensible heat load is 100 kW, and the latent heat load is 15 kW. Outside air is at 38C DB and 25C WB temp. Air is supplied to the space at 13C. If all-outside air system (no recirculation) is to be implemented, determine: (a) the cooling capacity in tons; (b) capacity of supply air fan in cmh; and (c) the coil bypass factor.
Q16: Air at 10° C dry bulb temperature and 8° C wet bulb temperature is supplied at the rate of 15m/min. It is brought to 20° C dry bulb temperature and 60% relative humidity by heating and then by adiabatic humidification. Find (a) capacity of the heating coil in kW, (b) surface temperature of the coil, if the by-pass factor is 0.32, and (c) capacity of the humidifier. [Ans. 3.6 kW; 26.77° C ;0.0555 kg / min]

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