File Name: heating and cooling load calculations ppt to .zip
Introduction to load calculations 2. Differences between conventional cooling and heating load calculation methodologies 3. Methods of estimating cooling and heating loads on buildings such as rules-of-thumb, semi-empirical methods etc. Estimation of the cooling capacity of the system 6. Heating load calculations. Explain the differences between conventional cooling and heating load calculations 2.
List commonly used methods for estimating cooling loads 3. Estimate the required cooling capacity of the coil by taking into account the by-pass factor of the coil, ventilation requirements etc. Explain briefly the procedure for estimating heating loads. Design outside conditions are selected from a long-term statistical database.
The conditions will not necessarily represent any actual year, but are representative of the location of the building. Design data for outside conditions for various locations of the world have been collected and are available in tabular form in various handbooks. The load on the building due to solar radiation is estimated for clear sky conditions. The building occupancy is assumed to be at full design capacity.
All building equipment and appliances are considered to be operating at a reasonably representative capacity. All these are sensible heat transfers. The various internal loads consist of sensible and latent heat transfer due to occupants, products, processes and appliances, sensible heat transfer due to lighting and other equipment.
Estimation of external loads: a Heat transfer through opaque surfaces: This is a sensible heat transfer process. The heat transfer rate through opaque surfaces such as walls, roof, floor, doors etc. CLTD is the cooling load temperature difference. Adjustment to the values obtained from the table is needed if actual conditions are different from those based on which the CLTD tables are prepared. However, the ground temperature depends on the location and varies with time.
However, the CLTD values obtained from the tables may not exactly fit the specific roof. Then one has to use his judgment and select suitable CLTD values. Heat transfer through fenestration: Heat transfer through transparent surface such as a window, includes heat transfer by conduction due to temperature difference across the window and heat transfer due to solar radiation through the window. Due to the large but finite thermal capacity of the roof, floor, walls etc.
Heat transfer due to infiltration: Heat transfer due to infiltration consists of both sensible as well as latent components. To and Ti are the outdoor and indoor dry bulb temperatures. Thus depending upon the age and condition of the building an appropriate ACH value has to be chosen, using which the infiltration rate can be calculated. The value of n varies between 0. Then this value is corrected in the end when the actual fan selection is done. Load due to occupants: The internal cooling load due to occupants consists of both sensible and latent heat components.
However, it should be noted that the fraction of the total heat gain that is sensible depends on the conditions of the indoor environment. Load due to lighting: Lighting adds sensible heat to the conditioned space. Since the heat transferred from the lighting system consists of both radiation and convection, a Cooling Load Factor is used to account for the time lag.
Thus the cooling load due to lighting system is given by:. A typical ballast factor value of 1. Internal loads due to equipment and appliances: The equipment and appliances used in the conditioned space may add both sensible as well as latent loads to the conditioned space. Using these tables, one can estimate the required cooling capacity of cold storages.
The cooling coil has a by-pass factor X. Then the procedure for heating load calculations becomes fairly simple. A building has a U-value of 0. K and a total exposed surface area of m2.
The building is subjected to an external load only sensible of 2 kW and an internal load of 1. If the required internal temperature is 25oC, state whether a cooling system is required or a heating system is required when the external temperature is 3oC. How the results will change, if the U-value of the building is reduced to 0. Solution : From energy balance,. An air conditioned room that stands on a well ventilated basement measures 3 m wide, 3 m high and 6 m deep.
One of the two 3 m walls faces west and contains a double glazed glass window of size 1. There are no heat gains through the walls other than the one facing west.
Calculate the sensible, latent and total heat gains on the room, room sensible heat factor from the following information. What is the required cooling capacity? K U-value for roof : 1. K U-value for floor : 1. K Effective Temp. Heat transfer rate through the walls: Since only west wall measuring 3m x 3m with a glass windows of 1. Heat transfer rate through floor: Since the room stands on a well-ventilated basement, we can assume the conditions in the basement to be same as that of the outside i.
Heat transfer rate through glass: This consists of the radiative as well as conductive components. Since no information is available on the value of CLF, it is taken as 1. Heat transfer due to infiltration: The infiltration rate is 0.
Load due to lighting: Assuming a CLF value of 1. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Uploaded by Haydery. Document Information click to expand document information Date uploaded May 09, Did you find this document useful?
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It represents the heating of substance X at a constant rate of heat transfer. For example heat pumps. Calculated Set Point?? C v Calculator for Valve Sizing. Calculate the heat required to convert The conduction calculator deals with the type of heat transfer between substances that are in direct contact with each other. Btu stands for — British thermal unit —.
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The programme can also be used to calculate cooling load due to walls and roofs. This paper establishes the results of cooling load calculation of different climate conditions by using CLTD method for a multi-story building w. Human comfortness is essential now a day because of the improvement in life style and increasing atmospheric temperature. Electrical air conditioning machines are not most suitable for large buildings because of the higher power consumption and shorter life. Central air conditioning is more reliable for easy operation with a lower maintenance cost. With large buildings such as commercial complex, auditorium, office buildings are provided with central air conditioning system. Educational and research institutions also need human comfortness, as the population of student community increase year by year.
Introduction to load calculations 2. Differences between conventional cooling and heating load calculation methodologies 3. Methods of estimating cooling and heating loads on buildings such as rules-of-thumb, semi-empirical methods etc. Estimation of the cooling capacity of the system 6.
Hybrid HVAC 1. Some dangers associated with heating and cooling systems—and that you should be aware of—include:. We test 20 filters for pressure drop and efficiency. The Mintie Corporation Founded in Dielectric heating provides volumetric heating, which means that heat is generated inside the material via absorption of electromagnetic energy from the applied field.
Cooling: SEER vs. EER vs. IEER vs. The usage of air - conditioning in the residential and commercial buildings is becoming necessary because of the enormous demand for thermal comfort and healthy indoor environment. In achieving human thermal comfort and healthy indoor environment in a large building, there are many types of air conditioning systems that can be used, including the multi - split type unit and the variable Vrf vs chilled water systems.
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cooling load calculation due to changing solar heat gains at various times Manual J Residential Load Calculation Eighth Edition. ft. x 3 VA = VA Appliances.ZГіsimo C. 03.06.2021 at 00:28
HEATING AND COOING LOADS To estimate the air onditioningload(Both heating and cooling loads) the following factors are to be considered.