Room Sensible Heat Calculation

We have simplified the entire process of calculating sensible heat.

Room sensible heat calculation.

Room sensible heat ratio rshr is the ratio of sensible heat to total heat including latent for a room or zone. H s c p ρ q dt 1 where. You will get the answer for sensible heat without getting into the complex process of actually calculating anything. The design cooling load or heat gain is the amount of heat energy to be removed from a house by the hvac equipment to maintain the house at indoor design temperature when worst case outdoor design temperature is being experienced.

Q sr sensible heat load in room kw btu hr. All you have to do is provide the input values and hit calculate. Q s sensible heat flow btu hr c p 0 2388 specific heat btu lb o f ρ 0 075 air density at standard conditions lb ft 3 q air flow in ft 3 min δt temperature difference o f latent heat. Isochoric specific heat c v is used for air in a constant volume isovolumetric or isometric closed system.

Isobaric specific heat c p is used for air in a constant pressure δp 0 system. Since the load due to sunlit surfaces varies as a function of solar time it is preferable to calculate the cooling loads at different solar times and choose the maximum load for estimating the system capacity. So a system that has an shr 0f 0 70 and 30 000 total btus of capacity at a set of conditions would produce 21 000 btus of sensible cooling and 9 000 btus of latent removal. Rshf q sr q tr 1.

The sensible cooling load refers to the dry bulb temperature of the building and. Q s 60 c p ρ q δt 1 075 q δt 2 where. Sensible heat calculator provides for the same. From the sensible and total cooling loads one can calculate the room sensible heat factor rshf for the building.

It can be expressed as. The room sensible heat factor rshf expresses the ratio between sensible heat load and total heat load in a room. H s sensible heat kw c p specific heat of air 1 006 kj kg o c ρ density of air 1 202 kg m 3 q air volume flow m 3 s dt temperature difference o c. Rshf c p t r t i h r h i 2.

The percentage of the capacity that goes toward sensible cooling at a given set of conditions for a given piece of equipment or space is called sensible heat ratio shr. Assuming a room to room load calculation has been done on a building the next step in utilizing the psychrometric chart would be to plot out the room sensible heat ratio lines for each zone. Q tr total heat load in room kw btu hr 1 can be modified to. At normal atmospheric pressure of 1 013 bar the specific heat of.

The sensible heat in a heating or cooling process of air heating or cooling capacity can be calculated in si units as. Specific heat c is the amount of heat required to change the temperature of a mass unit of a substance by one degree. There are two types of cooling loads. In english imperial units the sensible flow heat can be expressed as.