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heat_swamp_cooleff

Compute the swamp cooler temperatures at 65% amd 80% efficiency.

Available in version 6.4.0 and later.

Prototype

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/heat_stress.ncl"  ; This library is automatically loaded
                                                             ; from NCL V6.5.0 onward.
                                                             ; No need for user to explicitly load.

	function heat_swamp_cooleff (
		t          : numeric,  
		twb        : numeric,  
		iounit [2] : integer,  
		opt        : integer   
	)

	return_val [variable of type list containing two variables wuth the same dimensionality as t] :  float or double

Arguments

Scalar or array containing temperature(s) [ units see iounit(0) ].

twb

Scalar or array containing wet bulb temperature [ units must match t ].

opt

Currently not used. Set to 0.

Return value

A scalar or an array of the same size and shape as t. The output will be double if t or twb is of type double. The calculated quantity is unitless.

Description

Given temperature and wet-bulb temperature Compute swamp cooler efficiency at 65% (poorly maintained) and 80% (well maintained)


REFERENCES: 

    Buzan, J.R. et al (2015): 
           Implementation and comparison of a suite of heat stress metrics
              within the Community Land Model version 4.5
           Geosci. Model Dev., 8, 151-170, 2015
           www.geosci-model-dev.net/8/151/2015/    doi:10.5194/gmd-8-151-2015

Examples

Example 1:

   t   = 30.25      ; C
   twb = 25.5       ; C
   iou = (/0,0/)    ; (/C,C/)

   swp8065  = heat_swamp_cooleff(t, twb, iou, 0)
   swp80    = swp8065[0]        ; extract '80%' from list variable; convenience only 
   swp65    = swp8065[1]        ; extract '65%' 
   delete(swp8065)                  ; no longer needed

   print(swp80)
   print(swp65)

The output is