Problem 2. Consider a Variable Air Volume (VAV) system, which serves for two rooms. The air temperature at the exist of the cooling coil is 10 °C. The design room temperature is 24 °C for both rooms. For room 1, the sensible and latent heat load is 60 and 10 kW, respectively. For room 2, the sensible and latent heat load is 40 and 10 kW, respectively. Determine (1) The mass flow rate for each room in kg/s; (2) The actual relative humidity of each room.

Problem 2. Consider a Variable Air Volume (VAV) system, which serves for two rooms. The air temperature at the exist of the cooling coil is 10 °C. The design room temperature is 24 °C for both rooms. For room 1, the sensible and latent heat load is 60 and 10 kW, respectively. For room 2, the sensible and latent heat load is 40 and 10 kW, respectively. Determine (1) The mass flow rate for each room in kg/s; (2) The actual relative humidity of each room.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

Problem 2. Consider a Variable Air Volume (VAV) system, which serves for two rooms. The air
temperature at the exist of the cooling coil is 10 °C. The design room temperature is 24 °C for both
rooms. For room 1, the sensible and latent heat load is 60 and 10 kW, respectively. For room 2,
the sensible and latent heat load is 40 and 10 kW, respectively. Determine
(1) The mass flow rate for each room in kg/s;
(2) The actual relative humidity of each room.

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A single effect evaporator is used to concentrate 10 000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15 ° C. The evaporator is operated on Steam (85% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 75 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) Steam demand rate = Answer kg / hour. b. Steam economy when condensate temperature is released at 75 ° C. = Answer (kg of water evaporated / kg of steam)